Petrolisthes rosariensis Werding, 1978

Ferreira, Luciane Augusto De Azevedo & Anker, Arthur, 2021, An annotated and illustrated checklist of the porcelain crabs of Panama (Decapoda: Anomura), Zootaxa 5045 (1), pp. 1-154 : 116

Petrolisthes rosariensis Werding, 1978

( Fig. 72 )

Petrolisthes sp. I .— Werding 1977: 208, fig. 26(?).

Petrolisthes rosariensis Werding 1978: 214 ; Werding 1982: 444, fig. 3(?); Gore 1982: 19; Werding 1983: 410; Rodríguez et al. 2005: 565; Hiller et al. 2006: 553, 565; Poupin & Lemaitre 2014: 21, fig. 4F; Ferreira & Melo 2016: 188 , fig. 2H; Poupin 2018: 151.

Material examined. Panama [Caribbean]: 1 male, cl 4.3, cw 3.8, 1 ov. female, cl 3.6, cw 3.5 ( MZUSP 33690 ), Bocas del Toro , Isla Colón, Punta Caracol, shallow flat with fragmented coral rubble, large coral rocks and seagrass, depth 0.5–2 m, under and within coral rubble, leg. A. Anker, J. Luque, A.R. Palmer & T. Kaji, 27.04.2015; 1 male, cl 6.2, cw 5.4 ( MZUSP 33895 ), Bocas del Toro , Isla Colón, Boca del Drago, shallow flat with seagrass and coral rubble and coral rocks, depth 0.5–2 m, leg. A. Anker, J. Luque, A.R. Palmer & T. Kaji, 01.05.2015; 1 ov. female, cl 5.2, cw 5.1 ( MZUSP 33530 ), west of Portobelo , depth 0.5–1.5 m, fringing reef, in coral rocks and under rocks, leg. A. Anker & J.F. Lazarus-Agudelo, 26.03.2015; 2 males, cl 4.7, cw 4.3 and cl 4.3, cw 4.0 ( MZUSP 33554 ), same collection data as for previous specimen .

Previous records from Panama. Gore (1982); Rodríguez et al. (2005).

Distribution. West Atlantic: Belize, Panama (Bocas del Toro, Bahía Limón near Colón, Portobelo), Colombia and Brazil ( Gore 1982; Rodríguez et al. 2005; Ferreira & Melo 2016; Poupin 2018).

Ecology. Mainly subtidal, occasionally in the lower intertidal, known depth range: 0–35 m; mostly on coral reefs and adjacent habitats with abundance of coral rubble, rocks or calcareous algae ( Ferreira & Melo 2016; Poupin 2018; present study).

Remarks. Petrolisthes rosariensis is morphologically similar to P. galathinus , differing from the latter by the presence of two epibranchial teeth (vs. one epibranchial tooth in P. galathinus ); the lateral margin of the P1 propodus almost straight (vs. noticeably more convex in P. galathinus ); and the lack of a pubescence in the gape of the P1 fingers (Werding 1982; Ferreira & Melo 2016). The two species also differ in some aspects of the colour pattern (cf. Fig. 72 and Figs. 46–48 ; see also Werding 1982 for further details). The Brazilian specimen illustrated by Ferreira & Melo (2016: fig. 2H) is clearly discoloured after preservation in ethanol. Rodríguez et al. (2005) provided a lengthy discussion on some taxonomic issues with P. rosariensis , including typification and some disparities in the species’ diagnosis, which can be resolved only by re-examination of the original material of Werding (1977).

Hiller et al. (2006) recovered P. rosariensis as sister of Parapetrolisthes tortugensis ( Glassell, 1945) . This unexpected result may be somewhat incongruent with morphology of the adults, but seems to be partly supported by larval data. Therefore, Parapetrolisthes Haig, 1962 may soon be invalidated and P. tortugensis transferred back to Petrolisthes . Although P. tortugensis has not yet been found in Panama, its presence in Honduras ( Fig. 88B ), Belize and Colombia strongly suggests that it also occurs on Panamanian offshore reefs and islands ( Table 1).

Figures

FIGURE 46. Petrolisthes galathinus (Bosc, 1802) [sensu lato]: A, B, female (cl 5.1 mm, cw 4.5 mm) from Bocas del Toro, Panama (MZUSP 33894), dorsal (A) and ventral (B) views [photographs by AA].

FIGURE 47. Petrolisthes galathinus (Bosc, 1802) [sensu lato]: A, female (cl 11.2 mm, cw 11.1 mm) from Bocas del Toro, Panama (MZUSP 33896), dorsal view [photograph by AA]; B, young specimen of unknown sex (cl cw indet.) from Bocas del Toro, Panama (ULLZ/USNM), dorsal view [photograph courtesy of Justin Scioli]; C, female (7.1 mm, cw 6.8 mm) from Isla Grande, Panama (MZUSP 40069), dorsal view [photograph by AA].

FIGURE 48. Petrolisthes galathinus (Bosc, 1802) [sensu stricto]: A–D, extra-limital specimens, two males (cl cw indet.) from Florida Bay, USA (FLMNH UF 19688, 19680), dorsal (A, C) and ventral (B, D) views of the same specimen; E, extra-limital specimen, female (cl cw indet.) from Little Duck Key, Florida Keys, USA (FLMNH UF 14655), dorsal view [photographs by AA].

FIGURE 72. Petrolisthes rosariensis Werding, 1978: A, B, ovigerous female (cl 5.2 mm, cw 5.1 mm) from Portobelo, Panama (MZUSP 33530), dorsal (A) and ventral (B) views [photographs by AA].

FIGURE 88. Some Caribbean Porcellanidae reported from Colombia, in all likelihood also occurring in Panama: A, Madarateuchus vanderhorsti (Schmitt, 1924), male from Santa Marta, Colombia (CRBM-UV), dorsal view [photograph courtesy of Juan Felipe Lazarus-Agudelo]; B, Parapetrolisthes tortugensis (Glassell, 1945), ovigerous female from Utila, Honduras (not deposited), dorsal view; C, Petrolisthes amoenus (Guérin-Méneville, 1855), male from Saint Martin (FLMNH UF 32408), dorsal view, right P1 missing [photographs in B and C by AA]; D, Petrolisthes virgilius Hiller & Werding, 2019, male from Golfo de Urabá, Colombia (CRBM-UV), dorsal view [photograph courtesy of Juan Felipe Lazarus-Agudelo].