Petrolisthes glasselli Haig, 1957

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 : 88-91

Petrolisthes glasselli Haig, 1957

( Figs. 51– 53 , 89E )

Petrolisthes glasselli Haig 1957a: 33 , pl. 8, figs. 1–3; Haig 1957b: 13; Haig 1960: 39, pl. 20, fig. 2; Haig 1968: 61; Gore & Abele 1976: 22; Werding & Haig 1982: 66; Hickman & Zimmerman 2000: 65, unnumbered colour photograph; Hiller et al. 2006: 556; Lazarus-Agudelo & Cantera-Kintz 2007: 230; García-Madrigal & Andréu-Sánchez 2009: 33, fig. 3, E, F.

Petrolisthes amoenus .— Boone 1932: 41, figs. 11, 12 [not Petrolisthes amoenus ( Guérin-Méneville, 1855) ].

Material examined. Panama [ Pacific ]: 1 male, cl 4.5, cw 4.3 ( FLMNH UF 57145 ), Coiba Is., off eastern coast of Isla Coiba , Isla Granito de Oro , Mona Lisa submerged rock, 7°35’39.9”N, 81°42’45.3”W, depth less than 8 m, in dead Pocillopora heads, leg. M. Leray et al., 18.02.2019 (fcn PAN-052); 1 male, cl 4.7, cw 4.3 ( FLMNH UF 57146 ), same collection data as for previous specimen (fcn PAN-050); 1 male, cl 5.1, cw 4.7 ( FLMNH UF 57147 ), same collection data as for previous specimens (fcn PAN-049); 1 male, cl 4.6, cw 4.4, 1 ov. female, cl 4.4, cw 4.1 ( FLMNH UF 57148 ), Coiba Is ., Isla de Afuera, rocky intertidal and shallow subtidal with rocks, corals and coral rubble, depth at low tide 0–1 m, in crevices of coral rubble, leg. A. Anker et al., 19.02.2019 (fcn PAN-104); 1 ov. female, cl 5.4, cw 5.0 ( FLMNH UF 57149 ), same collection data as for previous specimen (fcn PAN-103); 1 male, cl 5.0, cw 4.4 ( FLMNH UF 57150 ), Coiba Is ., Isla Coiba , northwest coast, small rocky island off Bahía Santa Cruz, 7°37’53.4”N, 81°46”44.9”W, rocky plateau, under rocks and in rock crevices, leg. M. Leray et al., 20.02.2019 (fcn PAN-142) .

Previous records from Panama. Haig (1957, 1960); Gore & Abele (1976).

Distribution. East Pacific: Mexico, Costa Rica, Panama (Coiba Is., Secas Is., Bahía Honda in Veraguas, Las Perlas Is.), Colombia and Ecuador (Galápagos) ( Haig 1960; Gore & Abele 1976; García-Madrigal & Andréu- Sánchez 2009; present study).

Ecology. Intertidal and shallow subtidal, known depth range: 0–12 m; on rocky intertidal reefs and adjacent hard-bottom subtidal habitats rich in boulders, coral rubble and dead coral heads; under rocks or in crevices of rocks and dead corals, often found in interstices of living corals, such as Pocillopora and Pavona ( Haig 1960, 1968; Werding & Haig 1982; Hickman & Zimmerman 2000; García-Madrigal & Andréu-Sánchez 2007; present study).

Remarks. Petrolisthes glasselli is the eastern Pacific sister of the western Atlantic P. rosariensis Werding, 1978 ( Hiller et al. 2006). The two species share many morphological characters, such as the presence of two epibranchial teeth; the P2–P4 dactyli with a row of four spines ventrally; and the absence of pubescence on the ventral side of the P1 palm ( Hiller et al. 2006). However, P. rosariensis can be distinguished from P. glasselli by the convex lateral margin of the P1 palm (manus) and typically four instead of five teeth on the P1 carpus (Werding, 1982). Remarkably, despite their phylogenetic proximity, P. glasselli and P. rosariensis have very different colour patterns (cf. Figs. 51–53 , 72 ). The colour pattern of P. glasselli is in fact highly diagnostic among the eastern Pacific porcelain crabs, despite some variation observed in the Panamanian material ( Figs. 51–53 ). The ventral side of most specimens is brightly coloured with deep carmin or wine-red ( Figs. 51 , 52 ), although at least in one male, the red colour is much less conspicuous, also on the dorsal side ( Fig. 53 ).

Figures

FIGURE 51. Petrolisthes glasselli Haig, 1957: A, B, ovigerous female (cl 5.4 mm, cw 5.0 mm) from Coiba Island, Panama (FLMNH UF 57149), dorsal (A) and ventral (B) views [photographs by AA].

FIGURE 52. Petrolisthes glasselli Haig, 1957: A, B, male (cl 5.0 mm, cw 4.4 mm) from Coiba Island, Panama (FLMNH UF 57150), dorsal (A) and ventral (B) views [photographs by AA].

FIGURE 53. Petrolisthes glasselli Haig, 1957: A–C, male (cl 4.7 mm, cw 4.3 mm) from Coiba Island, Panama (FLMNH UF 57146), dorsal (A), ventral (B) and frontal (C) views [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 89. Some eastern Pacific Porcellanidae (all species reported from Panama) photographed in situ: A, Pachycheles vicarius Nobili, 1901, Bahía Málaga, Colombia; B, C, Petrolisthes edwardsii (de Saussure, 1853), Los Cabos, Baja California, Mexico (B), and Malpelo Island, Colombia (C); D, Petrolisthes donadio Hiller & Werding, 2007, Malpelo Island, Colombia, near sea urchin, Diadema mexicanum Agassiz; E, Petrolisthes glasselli Haig, 1957, Malpelo Island, Colombia; F, Petrolisthes haigae Chace, 1962, Malpelo Island, Colombia [photographs courtesy of Juan-Felipe Lazarus-Agudelo (A, C–F) and Jeff Goddard (B)].