An annotated and illustrated checklist of the porcelain crabs of Panama (Decapoda: Anomura) Author Ferreira, Luciane Augusto De Azevedo 0000-0003-1683-9962 Author Anker, Arthur 0000-0002-5350-4267 arthuranker7@gmail.com text Zootaxa 2021 2021-09-27 5045 1 1 154 http://dx.doi.org/10.11646/zootaxa.5045.1.1 journal article 10.11646/zootaxa.5045.1.1 1175-5326 5532178 B12C62E3-70D0-4989-BB1A-F4A75C492D8F Petrolisthes dissimulatus Gore, 1983 ( Fig. 41 ) Petrolisthes dissimulatus Gore 1983: 94 , figs. 2–4; Poupin & Lemaitre 2014: 17 , fig. 3E; Ferreira & Tavares 2017: 557 ; Poupin 2018: 149 . Petrolisthes marginatus . — Benedict 1901: 134 , pl. 3, fig. 1 [not Petrolisthes marginatus Stimpson, 1859 ]. Material examined . Panama [Caribbean]: 1 ov. female, cl 5.1, cw 4.9 ( MZUSP 33525 ) , Isla Grande , western point, depth 0.5–2 m , in crevices of coral rocks and dead corals, leg. A. Anker , J.F. Lazarus-Agudelo & T. Kaji , 27.03.2015 . Previous records from Panama . None. Distribution . West Atlantic: Cuba , Puerto Rico , N, E and S Lesser Antilles, Panama ( Isla Grande) and Colombia (Gore 1983; Poupin & Lemaitre 2014 ; present study). Ecology . Intertidal and shallow subtidal, known deptgh range: 0–2 m , probably deeper, to at least 15 m ; on coral reefs and rocky habitats associated with reef, under coral rubble and in dead corals (Gore 1983; present study). Remarks . Petrolisthes dissimulatus is closely related to the amphi-Atlantic P. marginatus Stimpson, 1859 , but can be distinguished from the latter by (1) the presence of two epibranchial teeth ( vs . a single epibranchial tooth in P. marginatus ); (2) the carapace subcircular, as wide as long ( vs . oblong, longer than wide P. marginatus ); (3) the front and median frontal lobe broader and less prominent than in P. marginatus ; (4) the P1 robust ( vs. P1 slender P. marginatus ); and (5) the P1 merus with two distal teeth on ventral side ( vs. single meral tooth in P. marginatus ) ( Ferreira & Tavares 2017 ). It seems to be an uncommon species, sparsely recorded from a few Caribbean localities. The ovigerous female from Isla Grande ( Fig. 41 ) apparently represents the first record from Panama .