Article

El isópodo Accalathura crenulata (Richardson, 1901) (Crustacea; Peracarida), el antúrido más grande encontrado en el Archipiélago Cubano.

February 2005

Authors:

Manuel Ortiz

National Autonomous University of Mexico

Carlos Varela

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Systematic list of species of peracarids from Chile (Crustacea, Eumalacostraca)

January 2008 · Gayana (Concepción)

Crustacean peracarids are a diverse group of invertebrates, common in terrestrial, freshwater and marine environments. The present study examines the species diversity of the orders Amphipoda, Cumacea, Isopoda, and Tanaidacea, presently reported from Chile. Other peracarid groups have not been recorded from Chile. A systematic list of presently recorded peracarid species and their geographic ... [Show full abstract] distribution in Chile from 18°S to 56°S, including the Archipelago of Juan Fernández and Isla de Pascua is provided. A preliminary biogeographic analysis suggests that species diversity increases from North to South. The facts that there are still large areas with unusually low number of species, and that many species recorded for Chile are unique records underlines the need for future taxonomic efforts in order to gain a thorough overview of the diversity of this important and species-rich group of invertebrates.

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Xenosinelobus balanocolus, a new tanaidid genus and species (Crustacea: Peracarida: Tanaidacea) from...

July 2019 · Zootaxa

This study describes a new genus and new species of Tanaidacea that was collected from inside the tests of dead Tetraclita barnacles in Singapore. Xenosinelobus n. gen. is most similar to Sinelobus but can be distinguished by the (1) unusually short antennal fifth article, (2) tooth-like lacinia mobilis on right mandible, (3) long terminal seta on epignath, (4) plumose inner seta near dactylus ... [Show full abstract] insertion on cheliped propodus, (5) spiniform seta on pereopod 1 coxa, (6) presence of setae on inner margins of pereopod 1 propodus and dactylus, (7) claw-like terminal articles on pereopods 2 and 3, (8) row of setulose and flattened denticulate setae along distal margin of pereopod 6 propodus, (9) dorsal seta on claws of pereopods 4–6, (10) complete row of dorso-transverse setae on pleonites 1 and 2, (11) one seta on pleopod basis outer margin, (12) two or three setae on pleopod endopod inner margin and (13) three-articled uropod with final article 1.6 times as long as preceding article. A new diagnosis and key to genera is provided for the subfamily Sinelobinae.

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A new species of Nuuanu (Amphipoda: Gammaridea: Melitidae) from shallow sandy bottoms of the Baleari...

December 2006 · Scientia Marina

Nuuanu beatricis n. sp., a new melitid amphipod, is described from shallow-water sandy bottoms on the S and SE coasts of Mallorca (Balearic Islands, Mediterranean). It differs from the rest of its congeners in the combination of: (1) non-geniculate antennule, much longer than antenna; (2) distal segment of mandibular palp shorter than second, armed with both D and E setae; (3) second segment of ... [Show full abstract] mandibular palp with 2 setae; (4) posteroventral lobe (sensu Lowry and Watson, 2002) absent from posterior margin of coxa 4; (5) reduced spine present on medial surface of coxa 5; (6) posterior margin of basis of pereopod 5 convex; (7) anterodistal lobe of coxa 7 wanting; (8) posterior margin of basis of pereopod 7 sparsely serrated along proximal half only; (9) pleonites 1-2 lacking dorsodistal spines; (10) anterodistal corner of epimeral plate 1 rounded; (11) exopod of uropod 3 longer than protopod; and (12) telson with terminal spine on each lobe. Although the new amphipod could be an alien species introduced from a distant tropical location with alien Caulerpa algae species, it is here regarded as an ancient Mediterranean element owing to its peracarid condition (i.e. reduced potential for dispersal), regressed visual apparatus, and crevicular-interstitial existence. The presumed presence of sternal gills in Nuuanu is rejected after demonstration of the coxal origin of the spiniform structures interpreted elsewhere as sternal gills.

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Genetic and morphological divergence at a biogeographic break in the beach-dwelling brooder Excirola...

December 2019 · BMC Evolutionary Biology

Background: There is a biogeographic break located at 30°S in the southeast Pacific, in a coastal area of strong environmental discontinuities. Several marine benthic taxa with restricted dispersal have a coincident phylogeographic break at 30°S, indicating that genetic structure is moulded by life history traits that limit gene flow and thereby promote divergence and speciation. In order to ... [Show full abstract] evaluate intraspecific divergence at this biogeographic break, we investigated the genetic and morphological variation of the directly developing beach isopod Excirolana hirsuticauda along 1900 km of the southeast Pacific coast, across 30°S. Results: The COI sequences and microsatellite data both identified a strong discontinuity between populations of E. hirsuticauda to the north and south of 30°S, and a second weaker phylogeographic break at approximately 35°S. The three genetic groups were evidenced by different past demographic and genetic diversity signatures, and were also clearly distinguished with microsatellite data clustering. The COI sequences established that the genetic divergence of E. hirsuticauda at 30°S started earlier than divergence at 35°. Additionally, the three groups have different past demographic signatures, with probable demographic expansion occurring earlier in the southern group (south of 35°S), associated with Pleistocene interglacial periods. Interestingly, body length, multivariate morphometric analyses, and the morphology of a fertilization-related morphological character in males, the appendix masculina, reinforced the three genetic groups detected with genetic data. Conclusions: The degree of divergence of COI sequences, microsatellite data, and morphology was concordant and showed two geographic areas in which divergence was promoted at differing historical periods. Variation in the appendix masculina of males has probably promoted reproductive isolation. This variation together with gene flow restrictions promoted by life history traits, small body size, oceanographic discontinuities and sandy-beach habitat continuity, likely influenced species divergence at 30°S in the southeast Pacific coast. The degree of genetic and morphological differentiation of populations to the north and south of 30°S suggests that E. hirsuticauda harbours intraspecific divergence consistent with reproductive isolation and an advanced stage of speciation. The speciation process within E. hirsuticauda has been shaped by both restrictions to gene flow and a prezygotic reproductive barrier.

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Do circum-Antarctic species exist in peracarid Amphipoda? A case study in the genus Epimeria Costa,...

August 2009 · ZooKeys

The amphipod genus Epimeria is species rich in the Southern Ocean and at present eight of its 19 species are reported with circum-Antarctic distributions. For the first time, specimens of epimeriid species from the Antarctic Peninsula, the Weddell Sea and the Ross Sea were analysed using partial COI genes sequences and morphological characters. In total 37 specimens of 14 species of Epimeria and ... [Show full abstract] two species of Epimeriella were analysed and the resulting molecular topology checked by critically reviewing taxonomic characters. The genus Epimeriella, genetically grouping within Epimeria is synonymised with the genus Epimeria. Sequences distances between populations of the nominal species Epimeria robusta from the Weddell and Ross Sea led to detailed morphological investigations, resulting in the description of Epimeria robustoides sp. n. from the Weddell Sea. Epimeria robusta Barnard, 1930 from the Ross Sea is redescribed. Sequences of a damaged Epimeria specimen of a species new to science from the lower continental shelf of the eastern Weddell Sea were included. Based on the current study, the hypothesis of circum-Antarctic species’ distributions in brooding amphipods proved to be unlikely.

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Rare and new cumaceans (Crustacea, Peracarida) from the southern margin of the Cap Ferret Canyon (Ba...

October 2012 · ZooKeys

Jordi Corbera

A new cumacean genus and species, Ithyleucon sorbei gen. et sp. n., was described from material collected in the southern margin of the Cap Ferret Canyon (Bay of Biscay, NE Atlantic). Although the new genus resembles Pseudoleucon Zimmer, 1903, in terms of the general aspect of the carapace and the pseudo-rostrum position, it shows important differences in the uropod structure and in the size of ... [Show full abstract] the antenna 1 accessory flagellum. In addition, some comments regarding the morphology of certain rare species (Mesolamprops denticulatus Ledoyer, 1983, Hemilamprops normani Bonnier, 1896 and Schizocuma spino-culatum (Jones, 1984)) are also provided.

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The Scutocoxifera tax. nov. and the information content of nuclear ssu rDNA sequences for reconstruc...

January 2002 · Journal of Crustacean Biology

The nuclear ssu rRNA gene of several isopods (Crustacea, Peracarida) was sequenced to study its phylogenetic information content. Several areas had to be cut out of the alignment of 31 isopod sequences and selected outgroup arthropod sequences due to the lack of alignable patterns. The final alignment had 2,533 positions and 43 sequences. The length of the isopod nuclear ssu rRNA genes varies ... [Show full abstract] between 2,098 and 3,402 bp. In some clades the gene length increases; in others like the cymothoids and bopyrids, long deletions occur. Some insertions are specific for major groups (e.g., amphipods, isopods). Most elongation areas evolve rapidly and are not alignable among higher taxa. Information content is visualized with spectra of supporting positions. Only a few groups are unambiguously supported with a signal distinctly higher than background noise. The results of maximum parsimony analyses are congruent with major aspects of earlier hypotheses on isopod phylogeny. Some contradictions are discussed. The latter are mainly based on a lack of reliable information. A major monophyletic group found in the molecular phylogenies and also supported by distinct morphological characters is named Scutocoxifera tax. nov., composed of the Oniscidea, Valvifera, Sphaeromatidea, Anthuridea, and Cymothoida. SEM photographs are presented to document the apomorphic state of the coxa in the Scutocoxifera.

Figure 3 In Phalloleucon Abyssalis, A New Cumacean Genus And Species (Crustacea: Peracarida: Leuconi...

January 2008

Ute Mühlenhardt-Siegel

FIGURE 3. Phalloleucon abyssalis gen. nov. sp. nov., holotype male: P 3: pereiopod 3; P 4: pereiopod 4; P 5: pereiopod 5; U: pleonite 6 and left uropod. Scale bars: 0.1 mm, if not otherwise indicated.

Remarks on the population structure of two Antarctic peracarid crustaceans: Eudorella splendida zimm...

January 2001 · Polish Polar Research

Magdalena Błażewicz

This paper presents preliminary data on the population structure of two Antarctic crustaceans Eudorella splendida and Nototanais antarcticus, commonly occurring in Admiralty Bay (South Shetland Islands). From analysis of the material studied it can be concluded that N. antarcticus is a progynous hermaphrodite with a life cycle lasting at least two years. The life cycle of E. splendida lasts ... [Show full abstract] probably 3-4 years. It is a semelparous species, but some females after brooding moult and revert into the intermediate stage.

Collections of the Natural History Museum, Zoological Section «La Specola» of the University of Flor...

December 2006

Gianna Innocenti

A list of the specimens belonging to the orders Leptostraca (1 family, 1 genus), Lophogastrida (1 family, 2 genera, 7 species), Mysida (1 family, 5 subfamilies, 31 gen-era, 57 species) and Cumacea (1 family, 1 genus, 1 species) preserved in the Zoological Section «La Specola» of the Nat-ural History Museum of the University of Florence is given. gli esemplari appartenenti al phylum Crustacea, ... [Show full abstract] Classe Malacostraca, Ordi-ne Leptostraca (1 famiglia, 1 genere), Lophogastrida (1 fami-glia, 2 generi, 7 specie), Mysida (1 famiglia, 5 subfamiglie, 31 generi, 57 specie) conservati nelle collezioni della sezio-ne di Zoologia «La Specola» del Museo di Storia Naturale dell'Università di Firenze.

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Una nueva especie de Oxyurostylis Calman, 1912 (Crustacea: Peracarida) de Cuba

July 2022 · Novitates Caribaea

Manuel Ortiz

Se describe una especie nueva del género Oxyurostylis para las aguas cubanas. La giba notable en el dorso del penúltimo segmento del pereón distingue con facilidad esta especie. La especie nueva es la sexta especie del género citada para el golfo de México y el mar Caribe, así como la décima que se conoce a nivel mundial.

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Tanaidacea from Brazil. I. The family Tanaellidae Larsen & Wilson, 2002

June 2009 · Zootaxa

Both male and female of two new species, i.e. Araphura arvedlundi n. sp. and Tanaella kroyeri n. sp. were collected from the continental slope of the Atlantic coast off northern Brazil and are described. This is the first record of the male of Araphura. An updated key is given to genus Araphura. Araphura io is transferred to the genus Araphuroides.

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El isópodo Accalathura crenulata (Richardson, 1901) (Crustacea; Peracarida), el antúrido más grande encontrado en el Archipiélago Cubano.

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Genetic and morphological divergence at a biogeographic break in the beach-dwelling brooder Excirola...

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Rare and new cumaceans (Crustacea, Peracarida) from the southern margin of the Cap Ferret Canyon (Ba...

The Scutocoxifera tax. nov. and the information content of nuclear ssu rDNA sequences for reconstruc...

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