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Pseudorhombila quadridentata (Latreille, 1828), male; dorsal habitus (A), thoracic sternum, abdominal somites and telson (B), frontal view (C), pleonal somites 1-3, right cheliped (P1) (D), 114 m, MOUFPE: 19994. Scale bar: 1 cm.
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The family Pseudorhombilidae Alcock, 1900 is widely distributed in the tropical western Atlantic, occurring from shallow waters to the continental slope, inhabiting sandy, gravelly, or muddy substrates. Despite the broad distribution of this family in the Americas, the species Pseudorhombila octodentata Rathbun, 1906 and Pseudorhombila quadridentat...
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Specimens of new record of dotillid crab Ilyoplax stevensi Kemp, 1919 were collected in January 2021 from intertidal zones of Shatt Al-Basrah Canal, Iraq. The diagnostic characteristics of these species were examined and are reported in the present paper.
Citations
... Xanthoidea currently includes: Linnaeoxanthidae Števčić, 2005;Panopeidae Ortmann, 1893;Pseudorhombilidae Alcock, 1900;andXanthidae MacLeay, 1838 (Ng et al. 2008;Lai et al. 2014). The Pseudorhombilidae includes almost exclusive American crabs, comprising 19 genera and 51 species (Lai et al. 2014;Clark & Cuesta 2015;Davie et al. 2015;Alves-Júnior et al. 2021;WoRMS 2022). Among them, Tetraxanthus Rathbun, 1898 includes two widely distributed Western Atlantic species: T. bidentatus (A. ...
The description of the first zoea stage of Tetraxanthus rathbunae Chace, 1939, the third known zoea of Pseudorhombilidae and the first for Tetraxanthus, was carried out from laboratory hatched larvae. Their morphology differs from other pseudorhombilid species previously described primarily in the number and type of setae on the antennule, antennal exopod, maxilla, first maxilliped, and second maxilliped. These zoeae, however, share the same number of spines on the carapace (rostral, dorsal, and lateral), absence of the endopod on the antenna, long and well-developed spinose protopod, maxillary exopod with four marginal plumose setae and a robust posterior process, the absence of setae on the basis of the second maxilliped, and the presence of three lateral spines on each side of the furca. The results obtained in the present study are of great importance in being only the third known first stage pseudorhombilid zoea and the first for the Tetraxanthus, as well as in contributing to the identification of brachyuran planktonic zoea. Additionally, it also provides information that can help elucidate pseudorhombilid phylogeny.
Five anomuran and one brachyuran species collected from continental shelf and slope off southern Brazil have their geographic ranges considerably extended southward: Neolithodes agassizii (Smith), Paguristes spectabilis McLaughlin and Provenzano, Pagurus heblingi Nucci and Melo, Phimochirus occlusus (Henderson), Mixtopagurus paradoxus A. Milne-Edwards, and the brachyuran Euchirograpsus antillensis Türkay. Pagurus heblingi was previously known only from its type locality (off Cabo Frio, Rio de Janeiro) and from off Espírito Santo. Paguristes spectabilis was known only from the holotype (off Trinidad, Caribbean Sea) and two additional females from off Rio de Janeiro. One female was found of the brachyuran Robertsella
meridionalis Tavares and Gouvêa, a species previously known only from two males. Additionally, the occurrence of the hermit crabs Dardanus venosus (H. Milne Edwards) and Oncopagurus gracilis (Henderson), and the brachyuran Hexapanopeus paulensis Rathbun are confirmed for Santa Catarina. The record of the brachyuran Neopilumnoplax americana (Rathbun) from Santa Catarina (27°S) probably actually refers to Neopilumnoplax lipkeholthuisi Tavares and Melo, a species described from Rio Grande do Sul (33°S) and Mar del Plata (37°S).
