C. H. J. M. Fransen

Naturalis Biodiversity Center | NCB · Department of Marine Zoology

During the “Tydeman” CANCAP VII expedition to the Cape Verde Islands in 1986 and the “Tyro” MAURITANIA II Expedition to the Banque d’Arguin off the coast of Mauritania in 1988, several specimens belonging to two species within the genus Periclimenes were trawled from deep water constituting range extensions for both species. The specimens are here...

A new symbiotic palaemonid shrimp Platypontonia ngae sp. nov., is described based on a male-female pair found inside the mantle cavity of a gastrochaenid bivalve mollusk collected on a coral slope on the island Panglao, Philippines. The new species constitutes the third member of the genus Platypontonia Bruce, 1968. The new species is described, fi...

The pantropical genus Palaemonella Dana, 1852 (Caridea: Palaemonidae) currently includes 27 species of free-living and symbiotic marine shrimps. The monophyly of Palaemonella with respect to several closely related genera, however, has been questioned by recent analyses. We tested the monophyly of Palaemonella based on multigene phylogenetic analys...

Symbiotic species, living within or on the surface of host organisms, may evolve a wide range of adaptations as a result of various selection pressures, host specificity of the symbiont and the nature of the symbiosis. In tropical marine coral reef ecosystems, palaemonid shrimps (Crustacea: Decapoda: Caridea) live in association with at least five...

Species of the decapod family Palaemonidae are common components of tropical coastal waters and coral reefs. The majority of these species are symbionts of various invertebrate phyla. Despite a long history of research on their species diversity in the Dutch Caribbean, recent field expeditions have yielded much new information. Combined with examin...

A new assessment of the global biodiversity of decapod Crustacea (to 31 December 2022) records 17,229 species in 2,550 genera and 203 families. These figures are derived from a well-curated dataset maintained on the online platform DecaNet, a subsidiary of the World Register of Marine Species (WoRMS). Distinct phases are recognised in the discovery...

Most marine shrimp species of the family Palaemonidae are characterized by symbiotic associations with hosts that belong to a wide range of invertebrate phyla. One clade of related endosymbiotic species has evolved to live inside the branchial chambers of ascidians and the mantle cavities of bivalve molluscs. The phylogeny of this clade (comprising...

A new species of Palaemonella , P. sandyi sp. nov., is described on the basis of specimens collected in association with euphylliid scleractinian corals, Euphyllia glabrescens and E. cristata . Material was collected from the Maldives, Cebu in the Philippines, Semporna in Malaysia, and from Java, Bali, Sulawesi, Kalimantan, Ternate and Raja Ampat i...

Marine symbiotic Palaemonidae, comprising over 600 species, live in association with marine invertebrates of different phyla, like Cnidaria, Echinodermata, Mollusca, Porifera, and Tunicata. A phylogenetic study is performed on a clade of bivalve- and ascidian-associated endosymbiotic shrimp species (Caridea: Palaemonidae), using morphological and m...

A new species of bivalve mollusk dwelling palaemonid shrimp of the genus Odontonia is described from the Berau Islands, East Kalimantan, Indonesia. This is the only Odontonia species recorded as a symbiont of a bivalve mollusk, all other congeners are known to associate with solitary ascidians. The new species belongs to the group wherein the dacty...

Two mantis shrimp species of Squillidae, Harpiosquilla harpax (de Haan, 1844) and H. japonica Manning, 1969, were originally described from Japan and both are closely similar to each other. To accurately identify Harpiosquilla material collected from Osaka Bay and the Kii Channel, morphological characters and coloration of 45 specimens were examine...

The octocoral associated species Paraclimenes gorgonicola is a deep-sea palaemonid shrimp briefly described in Bruce (1969) without illustrations. Paraclimenes franklini, the type species of the genus Paraclimenes, has been considered as a valid species and distinguished from P. gorgonicola by the presence of articulated postrostral teeth on the ca...

The family Anchistioididae comprises a single genus Anchistioides with three species: A. compressus and A. willeyi from the tropical Indo-West Pacific, and A. antiguensis from the tropical West Atlantic. The two Indo-West Pacific species are known to be symbionts of sponges. Material collected in recent years throughout the Indo-West Pacific yielde...

The Recent, dead and empty mollusc shells that are so common on the North Sea coast of the Netherlands are a valuable resource as analogues for palaeoecological and taphonomic research. Three specimens collected from a beach at Scheveningen, Den Haag (The Hague), are each notable and distinct. An articulated shell of a common mussel, Mytilus edulis...

Feeding interactions between fish species and crustaceans are not rare, such as the relations between cleaner shrimps and reef fishes (Horká et al. 2018) and between parasitic isopods and their fish hosts (Baeza 2015). In most of these cases the fish plays the main role as host and the crustacean a secondary role as associated species (Karplus 2014...

Alpheus leptochiroides De Man, 1909, a poorly-known species originally described from the Kai Islands in eastern Indonesia, is reported from Kavieng, eastern Papua New Guinea, representing only the second record of this snapping shrimp and slightly extending its distribution range into the tropical western Pacific. The original description was base...

Recent molecular analyses revealed Palaemon paucidens De Haan, 1844 to be species complex, since three genetically distinct types (designated by types A, B and C) were detected. A mitochondrial 16S rDNA sequence of the lectotype specimen collected by P. F. von Siebold nearly two centuries ago in Japan and held in Naturalis Biodiversity Center (form...

Most marine palaemonid shrimp species live in symbiosis with invertebrates of various phyla. These associations range from weak epibiosis to obligatory endosymbiosis and from restricted commensalism to semi-parasitism. On coral reefs, such symbiotic shrimps can contribute to the associated biodiversity of reef corals. Among the host taxa, mushroom...

Over the last century, a large body of literature emerged on mechanisms driving speciation. Most of the research into these questions focussed on terrestrial systems, while research in marine systems lagged behind. Here, we review the population genetic mechanisms and geographic context of 33 potential cases of speciation with gene flow in the mari...

Two new species of the caridean shrimp genus Hippolyte Leach, 1814 [in Leach, 1813-14] are described from the Tropical Central and East Atlantic. Hippolyte cedrici sp. nov., from Príncipe and São Tomé, can be distinguished from both the related H. holthuisi Zariquey Álvarez, 1953 and H. varians Leach, 1814 on the basis of rostral dentition, as well...

We describe a new species of stygobiont atyid shrimp of the genus Halocaridinides Fujino & Shokita, 1975 from subterranean brackish and freshwater environments on Socotra Island (Yemen). This is the first atyid shrimp discovered in the Socotra Archipelago. This Socotran endemic is the second species of Halocaridinides recorded from an Indian Ocean...

Two new species of palaemonid shrimp associated with ascidian hosts, Odontoniabagginsisp. n. from Tidore and Odontoniaplurellicolasp. n. , from Ternate, Indonesia are described and figured. Through phylogenetic analyses based on both morphological and molecular datasets (mitochondrial Cytochrome c oxidase subunit I gene and the 16S mitochondrial ri...

A collection of shrimp from deep reefs in the Dutch Caribbean is described. Most material originates from the Bonaire deep reef expedition (2013) by Wageningen Marine Research of Wageningen University. Some additional material was available from dives on Curaçao (2014). A new species of Pseudocoutierea Holthuis was recognized in the material collec...

Several species of palaemonid shrimps are known to act as fish-cleaning symbionts, with cleaning interactions ranging from dedicated (obligate) to facultative. We confirmed five evolutionarily independent origins of fish cleaning symbioses within the family Palaemonidae based on a phylogenetic analysis and the ancestral state reconstruction of 68 s...

This article firstly reports nocturnal cleaning symbiosis in an Indo-Pacific coral reef performed by the cleaner shrimp Urocaridella antonbruunii . Furthermore, this observation stands out, because it is the first observation of sleeping fish being cleaned.

A new sponge-associated species, Paraclimenaeus michaeli sp. nov. from Sulawesi, Indonesia, and Singapore, is described and illustrated. The new species can be distinguished from its congenerics by: (1) the downwards curved rostrum with 2 acute dorsal teeth subdistally, (2) the absence of subdistal teeth on the fixed finger of the major second chel...

This original form of this rebuttal was submitted to Science on 3 March 2017 (limited to 300 words as per Science editorial policy) but rejected on 13 March 2017. Herein, we elaborate on our original Science submission in order to more fully address the issue without the length limitations. This rebuttal is followed by the list of the signatories w...

Periclimenes rathbunae Schmitt, 1924 is a western Atlantic symbiotic shrimp species mainly associating with anemones. Adult shrimps of P. rathbunae are characterised by an orange-white spotted colour pattern. During fieldwork along the coast of Curacao (2013), morphologically similar, though generally smaller sized shrimps were collected from the s...

The majority of the almost 1,000 species of Palaemonidae, the most speciose family of caridean shrimp, largely live in symbioses with marine invertebrates of different phyla. These associations range from weak epibiosis to obligatory endosymbiosis and from restricted commensalism to semi-parasitism, with the specialisation to particular hosts likel...

Two new alcyonacean-associated species, Hamodactylus paraqabai sp. nov. from Papua New Guinea and the Great Barrier Reef and H. pseudaqabai sp. nov. from Indonesia and Malaysia, are described and illustrated. To evaluate the status of the new species and their relationship within the genus Hamodactylus Holthuis, 1952, we combined morphology and phy...

Coral-associated fauna is a relatively understudied topic. Hence, the nature of the relationship between an associated organism and its host is usually unknown. In the present study, the obligate associations between gall crabs (Decapoda: Cryptochiridae) and mushroom corals (Scleractinia: Fungiidae) are reviewed from a phylogenetic perspective. Bas...

staff members, PhD candidates and MSc students of the Naturalis Marine Biodiversity Team performed fieldwork on the reefs of Curaçao investigating crabs, shrimps, mollusks and polychaetes living in association with various invertebrate groups. Additionally, octocorals and stony corals were studied as potential host species. SCUBA dives were made at...

Figure S1. Tree resulting from analysis in Jane 4.0 showing the different coevolutionary events between Fungiidae (black lines) and Cryptochiridae (blue lines), based on the complete dataset.

Figure S3. Tree resulting from analysis in Jane 4.0 showing the different coevolutionary events between Fungiidae (black lines) and Cryptochiridae (blue lines), based on the common occurrences dataset.

Figure S4. Histogram resulting from a stats run in Jane 4.0 on the common occurrences dataset, showing the distributions of costs of the random sample solutions. The costs of the optimal [=coevolution] solution is indicated by the red dotted line.

Table S1. References to literature mentioning fungiid hosts of gall crabs.

Figure S2. Histogram resulting from a stats run in Jane 4.0 on the complete dataset, showing the distributions of costs of the random sample solutions. The costs of the optimal [=coevolution] solution is indicated by the red dotted line.

In recent years the systematic position of genera in the shrimp families Gnathophylli-dae and Hymenoceridae has been under debate, with phylogenetic studies suggesting the families are not real family level units. Here, we review the molecular evidence as well as the morphological characters used to distinguish both families, leading to the conclus...

A new species of pontoniine shrimp belonging to the 'Periclimenes obscurus species group' is described from the Berau Islands, North East Kalimantan, Indonesia. Specimens were obtained from aglaopheniid hydrozoans of the genus Macrorhynchia. The new species is here described and figured. Its affinities with related species are discussed and a DNA-b...

A second discovery of the echinoid associated shrimp species Diapontonia maranulus Bruce, 1986 is recorded from deep water off Curaçao, Leeward Islands of the Dutch Caribbean. The material is compared with the type description and paratypic material as well as with material of closely related species. A mtDNA COI barcode was obtained from the mater...

The Semporna reef complex is located at the east coast of Sabah (Malaysia) (Fig. 1), within the Coral Triangle, the centre of maximum marine biodi­ versity. Semporna has the largest concentration of reefs within Malaysia, which represent five major geomorphological reef types. The Tun Sakaran Marine Park in this area contains eight islands and is t...

During fieldwork in 2009 at Ternate, Indonesia, a pair of a pontoniine shrimp species belonging to the genus Conchodytes was collected from a bivalve mollusk of the genus Spondylus. This constitutes the first record of a species of the genus Conchodytes associated with a spondylid host. The specimens can be distinguished from other known Conchodyte...

A sponge-associated species of the genus Nippontonia new to science is described from Semporna, Sabah, Malaysia. The only other species in the genus is also known to be a sponge-dweller. The new species can be distinguished from its con- gener by a suite of characters mainly of the anterior appendages.

Hamodactylus macrophthalmus spec. nov., a new coral-associated pontoniine shrimp (Decapoda, Caridea, Abstract A new coral-associated species of the genus Hamodactylus is described from Lembeh Strait, NE Sulawesi, Indonesia. The three other known species in the genus have been recorded in association with octocorals. The single ovigerous female spec...

Background: The question of how many marine species exist is important because it provides a metric for how much we do and do not know about life in the oceans. We have compiled the first register of the marine species of the world and used this baseline to estimate how many more species, partitioned among all major eukaryotic groups, may be disco...

The lobster Scyllaras chacei Holthuis, 1960, a species of the family Scyllaridae Latreille, subfamily Scyllarinae Latreille, is reported for the first time from the continental shelf of Amapà State, Brazil. The female specimen was collected on September 31, 2010, at 72 m depth in the shrimp fishing zone of Amapà State (03°53'N 50°19'W), on a muddy...

A second discovery of the cockscomb oyster associated shrimp species Lacertopontonia chadi is recorded from Sabah (Malaysia). The material is compared with the type description and paratypic material. The systematic position of the genus is reevaluated on the basis of morphological and molecular data focusing on the genera Conchodytes and Chernocar...

The hippolytid genus Leontocaris includes eight species, all restricted to the deep sea (240–2182 m). Associations with deep sea coralline habitats were reported and are herein confirmed. Three Australian species were recorded at seamounts as were the specimens herein identified as L. smarensis sp. nov. These specimens were sampled at the South Mid...

The evolution of symbiotic relationships involving reef corals has had much impact on tropical marine biodiversity. Because of their endosymbiotic algae (zooxanthellae) corals can grow fast in tropical shallow seas where they form reefs that supply food, substrate and shelter for other organisms. Many coral symbionts are host-specific, depending on...

During the “ZIFIOCAL 1” cruise, carried out around the islands El Hierro and Tenerife (Canary Islands, NW Africa), at depths between 200 and 750 m, 990 mesopelagic shrimps belonging to 29 species were identified. Many of these species are rare, and therefore the present records constitute new data on their vertical and biogeographical distribution....

The Santo 2006 expedition provided an exceptional opportunity to scientists for exploring and gathering field data on one of the most important aspects of marine ecology: the animal associations. In Nature, living organisms interact with the environment and with other organisms since the beginning of life. The relationships between organisms of the...

A checklist of recent species of dendrobranchiate, stenopodidean, procarididean and caridean shrimps including synonyms and type localities. Also listed are unavailable names, larval names, nomina dubia and nomina nuda. A complete list of references to original descriptions of taxa listed is provided.

During fieldwork in Raja Ampat, West Papua, Indonesia, in 2007, a pontoniine shrimp, most likely belonging to the genus Anchistus, was collected from a coral boring bivalve of the genus Spengleria. This is the first record of a pontoniine shrimp living in association with a boring bivalve. As it probably concerns a juvenile shrimp, its identity rem...

The idea of devoting a special issue of Zootaxa to shrimp taxonomy was born during a late night meeting between the two editors in Leiden in November 2008. We discussed inviting all currently active shrimp taxonomists to come together in a single volume, dedicated to the description of new taxa in this fascinating group of animals. To be honest, ou...

During a study of the associated fauna of gorgonians and black corals on the reefs of Curaçao (Netherlands Antilles, Caribbean Sea) by the first author, a new species of Pseudopontonides Heard, 1986: P. plumosus sp. nov. was discovered, which is here described and figured.

During a study of the associated fauna of gorgonians and black corals on the reefs of Curaçao (Netherlands Antilles, Caribbean Sea) by the first author, a new species of Pseudopontonides Heard, 1986: P. plumosus sp. nov. was discovered, which is here described and figured.

A new sponge-associated species of the genus Periclimenes is described from Halmahera, Indonesia. The new species has some affinities with species from the Periclimenes iridescens and Periclimenes obscurus species complexes as well as with Phycomenes indicus (Kemp, 1915), but can easily be separated from these species by the very long upper antennu...