R. Johnsson

• PhD Zoology
• Federal University of Bahia

Coastal ecosystems have been subject to anthropogenic environmental stressors. Although exposed to different environmental pressures and susceptible to bioinvasion events, Todos-os-Santos Bay (TSB) (12oS, Bahia State, Brazil) has great ecological importance. Among the bioinvasive organisms, Tubastraea corals (the ‘sun corals’) are widespread in art...

Citation: Corgosinho, P.H.; Kihara, T.C.; Farias, A.; Schizas, N.; Neves, E.; Johnsson, R. A New Genus of Ectinosomatidae (Copepoda, Harpacticoida) Symbiont in the Digestive Tract of Eudistoma vannamei Millar, 1977 (Ascidia, Polycitoridae). Arthropoda 2025, 3, 8. https:// Abstract: A new genus of Ectinosomatidae is recorded in association with an A...

Artotrogidae Brady, 1880 is a cosmopolitan family with 23 valid genera and 131 known species. However, a considerable number of these species were subject of reexaminations and redescriptions recently. With the crescent number of new species discovered, it is becoming possible to better understand their boundaries. This study presents a new genus a...

Four new species of Mycale Gray, 1867 are described in shallow water environments from northeastern Brazil: Mycale (Zygomycale) odoya sp. nov., Mycale (Naviculina) oxeata sp. nov., Mycale (Paresperella) policuspidifera sp. nov. and Mycale (M.) salvadorensis sp. nov. The studied specimens were collected at Todos-os-Santos Bay, Bahia State, Brazil. T...

The family Dendrophylliidae comprises a genus of azooxanthellate corals, Tubastraea (also known as ‘sun corals’ or ‘cup corals’), native from the Indo-Pacific and introduced into the Atlantic Ocean in the early 1940s. In Brazil, Tubastraea colonies were first registered on oil platforms on the northern coast of Rio de Janeiro state (22°S) in the la...

Verrill's modern Mussismilia (the ‘brain corals’) were described in the 19th century, being hitherto considered endemic reef-building species to Brazil. Contrasting with the original diagnoses, highly variable morphological patterns have been observed among the congeners. Interspecific overlapping of major taxonomical characters has resulted in qui...

Entomolepididae is a small siphonostomatoid family with a distinct shield-like body morphology, comprising 9 genera and 20 species. These genera are divided into two subfamilies, mostly based on their body segmentation, the genera with fused pedigerous somites 2 and 3 are included in the Parmulodinae subfamily, and the genera with free pedigerous s...

Extending over warmer environments in the Brazilian waters, the exotic vermetid Eualetes tulipa was first recorded from Ceará State (3°S) in 2005. In 2009, it was reported in cold-water environments in Rio de Janeiro State (22°S). Seven years later, E. tulipa was recorded from Rio Grande do Norte State (6°S) on rocky pools in sandstone reefs. In th...

Biological invasions are considered one of the major concerns of conservation policies worldwide, with the introduction of exotic organisms in coastal environments threatening marine biodiversity. Indeed, mollusks are among the top invertebrates introduced around the planet, with snails and bivalves transported out of their original geographical ar...

In Brazil, two species of exotic 'sun corals' have been cited, majorly in ecological studies, over the last two decades. In Bahia State, colonies were registered for the first time in 2008 in a shipwreck in the Todos-os-Santos Bay. Since then, these species have spread locally across artificial and natural environments comprising variable patterns...

The limited temporal completeness and taxonomic accuracy of species lists, made available in a traditional manner in scientific publications, has always represented a problem. These lists are invariably limited to a few taxonomic groups and do not represent up-to-date knowledge of all species and classification. In this context, the B Brazilian meg...

A new species of Hourstonius (Amphipoda: Amphilochidae) from Todos-os-Santos Bay, Bahia State, Brazil, with an overview of the genus across the globe Abstract Amphilochidae comprises 92 species of small and colourful amphipods that live associated with sessile marine organisms. Hourstonius is one of the most diverse genera with 17 described species...

Ampithoe is one of the most diverse genera of Ampithoidae, commonly found in shallow waters associated with algae. This genus is distinguished by the absence of antenna 1 accessory flagellum, per-eopods 5-7 not prehensile and uropod 1 spur absent. From Brazil, only four species are hitherto known, which are A. thaix, A. robustimana, A. ramondi and...

Astrangia Milne Edwards & Haime, 1848 is a small, poorly known genus of Scleractinia, composed of 15 extant species with circumtropical to temperate distributions. Only two species of this genus have been distinguished in shallow-water environments along the Brazilian coast: A. solitaria (Le Sueur, 1817) and A. rathbuni Vaughan, 1906. Here, we desc...

The space is a limited resource for the establishment of benthic species onconsolidated substrates. Considering the introduction of invasive species, the effects of theinterspecific competitive interaction must be evaluated, once the prevalence of these organismsover native species depends upon a repertory of strategies not fully understanding. Tub...

Aoridae Stebbing, 1899 is a well diverse family that comprises 26 genera and 230 species across the globe. Bemlos is the most diverse genus with an underestimated biodiversity in the world. This genus shows a history of taxonomic changes; many of the actual species were previously described as Lembos Bate, 1857. Moreover, a great part of known aori...

Background The increasing habitat heterogeneity and complexity shows positive effects over different communities, leading to environmental diversity, access to resources and reducing the effectiveness of predation. In the present study we evaluate the structural and functional patterns of polychaete assemblages of three Mussismilia species with dif...

Two Astrangia Milne Edwards & Haime, 1848 species have been identified in shallow water environments along the Brazilian coast: A. solitaria (Le Sueur, 1817) and A. rathbuni Vaughan, 1906. Astrangia woodsi Wells, 1955 is an incrusting coral with blue-gray polyps, and a darker skeleton originally described to the Eastern Coast of Australia. This spe...

The siphonostomatoid copepod genus Scottocheres was established by Giesbrecht in 1897 and now includes nine species. Consequently, these new species introduced new characteristics that must be considered to define the genus. This study provides an emended diagnosis of the genus, describes a new species, discusses the geographic distribution and hos...

Caliphylla mediterranea A. Costa, 1867, described from the warm and temperate Mediterranean Sea, is the type species of a cosmopolitan genus hitherto considered monospecific. Several notable variations are noted in the records around the world, but gaps in the knowledge of the sea slug anatomy have negatively reflected on the Caliphylla taxonomy. T...

In the marine environment competition between sessile organisms may influence habitat conditions for associated small invertebrates, acting as a selective pressure for individuals with suitable traits to select profitable habitats and leading individuals less adapted to occupy unfavorable habitats. Intraspecific competition may also influence...

The Entomolepididae family is a small taxon with a very characteristic body morphology and is represented, in the Atlantic Ocean, by three genera and five species. A recent study in Todos-os-Santos Bay, in Bahia State, has revealed a new species of Spongiopsyllus and a new species and genus belonging to the Entomolepididae. The new species of Spong...

Eriopisidae is a widespread amphipod family, whose members have subcylindrical bodies, often do not have eyes, showing elongate third uropods in which the endopod is reduced and the exopod can become very long. This is the first record of Eriopisidae from Central America. Here, we describe the new genus and species Panamapisa guaymii gen. nov., sp....

Habitat structure increases richness and abundance of species in many environments by providing easy access to resources and refuge from predators. In coral reefs, corals are habitat for many organisms and differences in their morphologies may act as variation in habitat structure for associated fauna. In the present study, we investigate whether t...

Neoparmulella periperiensis gen. et sp. nov. is a new siphonostomatoid copepod found associated with an endemic octocoral Phyllogorgia dilatata (Esper) in Bahia State, northeastern region of Brazil. The new genus belongs to the subfamily Parmulodinae which is recorded for the first time in the South Atlantic Ocean. The new genus differs from all ot...

Cryptopontius is the most species-rich genus in the family Artotrogidae with 25 species, being recorded in almost all oceans, except in the Arctic. However only three species of this genus have been recorded from the Brazilian coast, all of them along the coast of Pernambuco state. This study describes two new species of the genus. Cryptopontius ph...

A new monotypic superfamily, family, genus and species of Hadziida is described from the Brazilian continental shelf. Magnovioidea superfam. nov. Magnovidae fam. nov. and Magnovis gen. nov. are distinguished by the presence of: antenna 1 shorter than the peduncle of antenna 2; maxilliped outer plate falcate; palp, article 4 reduced and left and rig...

Marine invertebrates are reported as habitats for other organisms. The variations in their morphological patterns may influence the associated fauna as they provide different environmental structures. Corals represent a good example of such invertebrates, due to the variation in their skeleton morphologies. Thus, this study aims to evaluate the ric...

Two new species of amphipods associated with the bioinvasive coral Tubastraea coccinea from Todos-os-Santos Bay are described. The bioinvasive sun coral is known for competing with native coral species, which shelter a big diversity of associated fauna, especially amphipods. Leucothoe oxumae sp. nov. shows acute rostrum, antenna 1 about 1/4 of body...

Predation is an interaction between species that influences community organisation by the direct consumption of prey, influencing prey numbers, behaviours and traits. The intensity of predation is greatly influenced by the environment, and the physical structure of habitats may influence predation intensity by providing refuge for prey or reducing...

The Family Entomolepididae is composed by 7 genera and 15 species. During a survey on the known species and the search for new species, a new Spongiopsyllus is described associated with sponge Aplysina insularis. The new species has antennule 14-segmented, four setae on both lobes of maxillule, some unique features on the leg setation and the armat...

A new species of the genus Ceradocus Costa, 1853 is described from Northeastern Brazil. This species is unique in having: (1) male gnathopod 2 propodus palm ornamented, palmar corner defined by a soft spine; (2) spines along the entire posterior margin of epimeral plate 3, (3) telson with very long apical setae. This new species is the second speci...

Two new species of Quadrimaera are described from Brazil. Quadrimaera yemanjae sp. nov. shows article 2 of mandibular palp longer than the others, coxa 1 with anteroventral corner rounded and 8 concavities on gnathopod 2 propodus palm. Quadrimaera miramirandella sp. nov. shows coxa 1 with anteroventral corner rounded and produced, gnathopod 1 with...

Two new species of siphonostomatoid copepods are described based on specimens collected off Tokara Islands located in the northern part of the Ryukyu Islands, Southern Japan. Cholomyzon multisetum sp. nov. (Coralliomyzontidae) found from the orange cup coral Tubastraea coccinea Lesson, 1829 (Hexacorallia: Scleractinia: Dendrophylliidae) has the fol...

A new Late Cretaceous species of Petalobrissus, Petalobrissus lehugueurae sp. nov., is described from the Jandaíra Formation, Potiguar Basin, state of Rio Grande do Norte. To date, this genus comprises a total of 20 species, only two of which, Petalobrissus setifensis and Petalobrissus cubensis have so far been recorded from the Jandaíra Formation....

Recent surveys of the copepod fauna associated with the sponge Ircinia felix (Porifera, Dictyoceratida) in Brazil resulted in the discovery of a new siphonostomatoid species belonging to a recently erected genus of Asterocheridae. Setacheres portobarrensis sp. nov. possesses a 21-segmented antennule, with 3 free distal segments, after the aesthetas...

Eulimids snails are renowned for their parasitic habits on Echinodermata. These gastropods can be ectoparasites, endoparasites and some groups are able to make gall in their host. This is the case of the Caribbean eulimid Sabinella troglodytes, which lives in association with the cidaroid sea urchin Eucidaris tribuloides. The present work describes...

The family Asterocheridae Giesbrecht has several genera associated with sponges including Asterocheres Boeck, 1859. The type genus is commonly found in sponges but it is also recorded in echinoderms, bryozoans, and corals. A revision of the diagnosis of Asterocheres conducted in 2010 was the beginning of a reorganization process, culminating in the...

The genus Elasmopus is the most diverse in the Family Maeridae. Five new species and new records of Elasmopus from the Brazilian coast are herein described. The specimens were collected in intertidal and subtidal zones along the Northeastern Brazilian coast between 2010 and 2014. The distribution of Elasmopus longipropodus along the coast is extend...

This paper describes a species of the genus Cyphocaris Boeck, 1871, the first record of the family Cyphocarididae Lowry & Stoddart, 1997 from Brazil. Two specimens, both females, were found in the stomach contents of a tuna caught in the Saint Peter and Saint Paul Archipelago. The new species is characterized by coxae 4 and 5 both large, coxa 4 par...

Asterocheres Boeck, 1860 is the largest genus of the siphonostomatoid copepod family Asterocheridae, containing 63 val-id species. The genus is known for its symbiotic relationships with many marine invertebrate taxa, especially sponges, cnidarians, bryozoans, and echinoderms. Recent studies have restricted the diagnosis of this genus. Consequently...

A new species of Oxychona tuas found during excursions to the Michelin Ecological Reserve (13°S), Southern Bahia State (Northeastern Brazil), which comprises an Atlantic Rainforest Conservation Unit. Living snails and empty shells were collected from ground litter accumulations and kept in an artificial environment supplied zvith local water and se...

Brazilian coral reefs form structures significantly different from the well-known reef models, as follows: (i) they have a growth form of mushroom-shaped coral pinnacles called “chapeirões”, (ii) they are built by a low diversity coral fauna rich in endemic species, most of them relic forms dating back to the Tertiary, and (iii) the nearshore bank...

Os recifes de corais abrigam uma grande diversidade de vida, oferecendo locais de refúgio, desova, criação, alimentação e reprodução para muitas espécies, além de serem uma importante fonte de alimento e de recursos econômicos para a sobrevivência das populações costeiras. Os pesquisadores componentes do Grupo de Trabalho Recifes e Ecossistemas Cor...

Coral habitat structures increase abundance and richness of organisms by providing niches, easy access to resources and refuge from predators. Corals harbor a great variety of animals; the variation in coral species morphology contributes to the heterogeneity and complexity of habitat types. In this report, we studied the richness and abundance of...

A new amphipod species of Metharpinia Schellenberg, 1931 is described from Campos Basin, southeastern Brazilian coast. The material was collected with van Veen grab from unconsolidated substratum, off the mouth of the Paraíba do Sul River. The new species can be distinguished from its congeners by presenting a strongly constricted rostrum and a sle...

Melanoides tuberculata (Müller, 1774) (Gastropoda: Thiaridae) is a freshwater gastropod native to Africa and Asia. It is a bioinvader of remarkable ecological capabilities presenting euryoic and highly adaptable to eutrophic conditions, M. tuberculata has also been found in estuarine environments. The first occurrence of the species in South Americ...

A new species of the genus Dulichiella Stout, 1912 is described for the Northeastern Brazilian coast. The new species is recognized from the others in the genus by presenting (1) the accessory flagellum 5-articulate, (2) distolateral crown of gnathopod 2 of males with 4 spines, (3) Maxilla 1 inner plate, outer plate and palp distally enlarged and r...

Three species of cryptochirid crabs, obligatory symbionts of scleractinian corals, have so far been recorded from Brazil: Troglocarcinus corallicola, Opecarcinus hypostegus and Kroppcarcinus siderastreicola. All three genera are monospecific. Individuals belonging to an undescribed species of Troglocarcinus, here described as T. hirsutus sp. nov.,...

Siderastrea is a small genus of scleractinian corals, composed by zooxanthellate massive colonial forms. Besides contributing to the consolidation of the reef structure, represent a group with significant resistance to environmental stress. Until the 70’s, its taxonomy was a complicated task, limited by the difficulty in identifying morphotypes. Mo...

In marine environments, a wide range of small, cryptic invertebrates are specialist inhabitants of sessile Scleractinian corals, the exclusive hosts of cryptochirid crabs which reside in the cavities of infested coral colonies. These cavities likely affect coral growth, especially when crabs colonize the surface of the corals early in their develop...

Holothuroids are echinoderms known by the cylindrical unarmed body and calcareous structures reduced to microscopic ossicles embed in the dermis. Out of the 40 species distributed for the entire Brazilian littoral, only twelve Holothuroidea species have been reported to Bahia State. The reduced number of species reveals restricted knowledge on the...

The polyclad Pericelis cata has been reported in two distinct localities along the North Atlantic: Curaçao and the Caribbean coast of Colombia. Recently identified from the Southwestern Atlantic, the species was first described from the Cabo Frio region (23°S) (Rio de Janeiro State), a transitional zone between warm and cold water species located s...

Although around 3,000 species of nudibranchs are known worldwide, only nearly 100 species are reported from Brazil. From Bahia State, northeastern Brazil, only seven species are listed. The current article provides four new records of nudibranchs from this region: Geitodoris pusae (Marcus 1955); Felimida paulomarcioi (Domínguez, García and Troncoso...

The polyclad Pericelis cata has been reported in two distinct localities along the North Atlantic: Curaçao and the Caribbean coast of Colombia. Recently identified from the Southwestern Atlantic, the species was first described from the Cabo Frio region (23°S) (Rio de Janeiro State), a transitional zone between warm and cold water species located s...

Asterocheres siphunculus, a new species of Asterocheridae (Copepoda, Siphonostomatoida) associated with Eucidaris tribuloides (Lamarck, 1816) (Echinodermata, Echinoidea) in Brazil Abstract Asterocheres Boeck, 1859 is the most speciose genus within the copepod family Asterocheridae Giesbrecht, 1899. Its main hosts are sponges, cnidarians, bryozoans,...

The family Entomolepididae is represented in the South Atlantic Ocean solely by Spongiopsyllus, a monotypic genus found previously in association with sponges. A recent survey on the Boa Viagem Reefs, located off Salvador, Bahia State, on the northeastern region of Brazil, has revealed a new species of the genus, Spongiopsyllus redactus n. sp., fou...

In Brazil, knowledge on copepods of the order Siphonostomatoida dates back to the late 1800s, with the earliest record concerning parasitic copepods of fish. In contrast, the first record in Brazil of a copepod associated with an unknown marine invertebrate did not appear until 1988, with further studies on this copepod group occurring only during...

The morphology of sessile invertebrates, such as scleractinian corals, can be controlled by environmental and genetic mechanisms and, consequently, it is highly variable. Morphological variation has puzzled taxonomists by posing challenges to species classification within cryptic species complexes. The ‘Atlantic Siderastrea Complex’ is a suitable e...

Members of the Cryptochiridae are small gall-crabs that live as obligate symbionts of scleractinian corals. Only two species have so far been recorded in the western Atlantic Ocean. Herein a new Cryptochiridae genus and species is described, and new information is added on the life history of cryptochirids. The new genus is characterized by having...

The current article provides the first record of Annulobalcis aurisflamma Simone and Martins, 1995 outside São Paulo state, Brazil. Herein we extend its geographical distribution to northeastern Brazil.

The nudibranch FLABELLINA DANA Millen and Hamann, 2006 is reported from two localities in the northeastern Brazilian coast. These are the first records of this species, previously recorded from localities in the Bahamas and the Caribbean Sea, in South Atlantic Ocean, extending its known geographic distribution more than 3500 km southward.

The crabs of the genus Dissodactylus are well known as ectosymbionts of irregular echinoids belonging to Clypeasteroida and Spatangoida. Dissodactylus crinitichelis is the only species of the genus reported in Brazil. The pea crab species has been already recorded associated with four species of echinoids in Brazilian waters. This paper reviews the...

The nudibranch Flabellina dana Millen and Hamann, 2006 is reported from two localities in the northeastern Brazilian coast. These are the first records of this species, previously recorded from localities in the Bahamas and the Caribbean Sea, in South Atlantic Ocean, extending its known geographic distribution more than 3500 km southward.

The current article provides the first record of Annulobalcis aurisflamma Simone and Martins, 1995 outside São Paulo state, Brazil. Herein we extend its geographical distribution to northeastern Brazil.

The objective of this study was to describe the composition of two mesozooplankton and ichthyoplanktonestuarine communities in Jandaíra, Bahia (Tabatinga River), impacted by a shrimp farm; and in Conde, Bahia (ItapicuruRiver), a pristine estuary. Samples were collected through horizontal hauls using a net (200 μm mesh size), coupled to aflowmeter,...

Samples of Siderastrea collected by the geologist C. F. Hartt during expedition to Brazil (19th century), anddeposited at the National Museum of the Natural History, Smithsonian Institution, have been re-examined. Taxonomicalanalyses resulted in the identification of a colony of S. siderea from offshore northern Bahia state. Following recentstudies...

sUMMaRy: the genus Madracis has been known in brazil from four deep water species, namely M. mirabilis, M. aspe-rula, M. brueggemanni, and M. pharensis, and one zooxanthellate species from shallow water environments, M. decactis. delicate fragments of a small branching colony of an undescribed Madracis were collected at 73 m depth, northern salvado...

Three new copepod species, Bradypontius ancistronus sp. nov., Cryptopontius aesthetascus sp. nov. and Cryptopontius expletus sp. nov., of the siphonostomatoid family Artotrogidae are described based on specimens from sponge and algal hosts collected along the Brazilian coast. These findings represent the first records of artotrogid copepods from Br...

Three new copepod species, Bradypontius ancistronus sp. nov., Cryptopontius aesthetascus sp. nov. and Cryptopontius expletus sp. nov., of the siphonostomatoid family Artotrogidae are described based on specimens from sponge and algal hosts collected along the Brazilian coast. These findings represent the first records of artotrogid copepods from Br...

FIGURE 2. Bradypontius ancistronus sp. nov., male holotype (MNRJ 12910). (a) habitus, dorsal view; (b) urosome, dorsal; (c) antennule; (d) antenna. Scale bars: a = 250 µm; b = 100 µm; c – d = 50 µm.

FIGURE 9. Cryptopontius expletus sp. nov., female holotype (MNRJ 12912). (a) maxillule; (b) maxilla; (c) maxilliped; (d) P 1; (e) P 2. Scale bars: a = 25 µm; b – e = 100 µm.

FIGURE 4. Bradypontius ancistronus sp. nov. male holotype (MNRJ 12910). (a) P 3; (b) P 4. Scale bars: all 25 µm.

FIGURE 7. Cryptopontius aesthetascus sp. nov., male holotype (MNRJ 12909). (a) P 1; (b) P 2; (c) P 3; (d) P 4; (e) P 5. Scale bars: all 25 µm.

FIGURE 3. Bradypontius ancistronus sp. nov., male holotype (MNRJ 12910). (a) distal end of mandibular stylet; (b) maxillule; (c) maxilla; (d) maxilliped; (e) P 1; (f) P 2. Scale bars: a, d – f = 50 µm; b – c = 100 µm.

FIGURE 5. Cryptopontius aesthetascus sp. nov., male holotype (MNRJ 12909). (a) habitus, dorsal; (b) urosomites 2 – 6, dorsal; (c) antennule; (d) antenna. Scale bars: a = 150 µm; b = 50 µm; c – d = 25 µm.

FIGURE 8. Cryptopontius expletus sp. nov., female holotype (MNRJ 12912). (a) habitus, dorsal view; (b) urosomites 2 – 5, dorsal; (c) antennule; (d) antenna; (e) distal end of mandibular stylet. Scale bars: a = 250 µm; b – c = 100 µm; d – e = 25 µm.

FIGURE 10. Cryptopontius expletus sp. nov., female holotype (MNRJ 12912). (a) P 3; (b) P 4; (c) P 5. Scale bars: a – b = 100 µm; c = 25 µm.

FIGURE 1. Location of collection sites in Brazil: (1) Abrolhos region; (2) Todos os Santos Bay; (3) Santo Aleixo Island.

FIGURE 6. Cryptopontius aesthetascus sp. nov., male holotype (MNRJ 12909). (a) anal somite and caudal rami, dorsal; (b) distal end of mandibular stylet; (c) maxillule; (d) maxilla; (e) maxilliped. Scale bars: a, c – e = 25 µm; b = 50 µm.

Identification of scleractinian corals is traditionally based upon morphological analysis of skeleton traits. However, due to the influence of the environment on coral development, and the pattern highly variable of most diagnostical characters, additional information related to anatomy of soft parts, reproductive behavior and ecological interactio...

Identification of scleractinian corals is traditionally based upon morphological analysis of skeleton traits. However, due to the influence of the environment on coral development, and the pattern highly variable of most diagnostical characters, additional information related to anatomy of soft parts, reproductive behavior and ecological interactio...

The siphonostomatoid fauna associated with the sponge, Placospongia cristata Boury-Esnault, is studied for the first time. Asterocheres bimbarrensis n. sp. is characterized by having two spines distally on the third endopod of P4 instead of a seta and a spine, is described and compared with its congeners. Another species of the genus, A. neptunei J...

The siphonostomatoid fauna associated with the sponge, Placospongia cristata Boury-Esnault, is studied for the first time. Asterocheres bimbarrensis n. sp. is characterized by having two spines distally on the third endopod of P4 instead of a seta and a spine, is described and compared with its congeners. Another species of the genus, A. neptunei J...

The family Cryptochiridae includes a small group of cryptic crabs that inhabit cavities in scleractinian corals. They are represented in Brazil by two species. Troglocarcinus corallicola, found from Maranhão to Bahia states and that occurs in many species of the coral families Mussidae, Faviidae, Caryophillidae and Siderastreidae. Opecarcinus hypos...

The Artotrogidae is among the most primitive of siphonostomatoid families. Their preferred hosts, as well as precise nature of their symbiotic relationship with the host, remain uncertain despite more than a hundred years of occasional descriptions of new species and genera. Metapontius is one such case. The genus, erected in 1923 by Hansen to acco...

The Artotrogidae is among the most primitive of siphonostomatoid families. Their preferred hosts, as well as precise nature of their symbiotic relationship with the host, remain uncertain despite more than a hundred years of occasional descriptions of new species and genera. Metapontius is one such case. The genus, erected in 1923 by Hansen to acco...

A new species of artotrogid copepod (Siphonostomatoida), Cryptopontius tanacredii n. sp., associated with the scleractinian coral Pocillopora damicornis (Linnaeus) from Easter Island, is described. The new species can be distinguished from its 20 congeners by the combination of the following six characters: (1) 9-segmented antennule, (2) terminal s...