Petrolisthes agassizii Faxon, 1893

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 : 64

Petrolisthes agassizii Faxon, 1893

( Figs. 34 , 35 )

Petrolisthes agassizii Faxon, 1893: 174 ; Faxon 1895: 69, pl. 15, figs. 1, 1a; Haig 1957b: 12; Haig 1960: 32, pl. 20, fig. 4; Haig 1968: 60; Gore & Abele 1976: 20; Gore 1982: 10; Werding & Haig 1982: 65; Moran 1984: 78; Hiller et al. 2004: 4; Hiller & Werding 2007: 187; García-Madrigal & Andréu-Sánchez 2009: 30, fig. 3A.

Petrolisthes agassizzi (lap. cal.).— Lazarus-Agudelo & Cantera-Kintz 2007: 229.

Material examined. Panama [ Pacific ]: 1 ov. female, cl 5.5, cw 5.6 ( FLMNH UF 57706 ), 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., 22.02.2019 (fcn PAN-223) ; 1 male, cl 8.6, cw 9.0 ( MZUSP 33890 ), Las Perlas Is ., Isla Contadora , Playa Sueca, under rocks and in rocks, leg. J. Luque & A.R. Palmer, 17.04.2015 ; 1 ov. female, cl 8.2, cw 8.3 ( FLMNH UF 57707 ), Las Perlas Is ., Isla Contadora , north of Playa Larga, 8°37’59.4”N, 79°01’52.9”W, rocky reef, under rocks, leg. P.P.G. Pachelle & M. Leray, 22.03.2019 (fcn PP 19-049) ; 1 male, cl 10.3, cw 10.4 ( FLMNH UF 57708 ), same collection data as for previous specimen (fcn PP 19-058) ; 1 ov. female, cl 5.5, cw 5.7 ( MZUSP 40074 ), Las Perlas Is ., Isla Bartolomé , rocky platform partly exposed at low tide, in crevices of rocks and dead and living corals, depth 0–1 m, leg. A. Anker, J. Luque, A.R. Palmer & T. Kaji, 19.04.2015 ; 1 male, cl 8.8, cw 9.4 ( MZUSP 34095 ), Río Mar , rocky intertidal, low tide, leg. A. Anker, J.F. Lazarus-Agudelo & T. Kaji, 19.03.2015 .

Previous records from Panama. Faxon (1893); Haig (1957, 1960); Gore & Abele (1976); Gore (1982).

Distribution. East Pacific: Mexico, Costa Rica, Panama (Coiba Is., Río Mar, Isla Venao, Taboga Is., vicinity of Ciudad de Panamá, Las Perlas Is.) and Colombia ( Haig 1960; Gore 1982; García-Madrigal & Andréu-Sánchez 2009; present study).

Ecology. Intertidal and shallow subtidal, known depth range 0–9 m; on rocky and mixed rocky-sandy shores; under rocks, coral rubble or other debris, in crevices of rocks and dead corals ( Haig 1960, 1968; present study).

Remarks. According to Hiller & Werding (2007), P. agassizii is morphologically closest to P. edwardsii (de Saussure, 1853) and P. donadio Hiller & Werding, 2007 (see below), but can be distinguished from both of them by the P1 carpus three times as long as wide, with three longitudinal rows of piliferous tubercles, and the carapace striations being continuous across the metabranchial regions, not interrupted as in P. edwardsii and P. donadio .

In life, P. agassizii can be recognised by the combination of the bluish antennal flagella; the Mxp3 with the distal articles conspicuously bright blue, the penultimate one also with a large black spot; the bright orange-red base of the ventral side of the P1 dactylus; and the P2–4 with meri spotted and mottled with brown-green and the propodi banded with white and brown ( Figs. 34 , 35 ).

Figures

FIGURE 34. Petrolisthes agassizii Faxon, 1893: A, B, male (cl 8.6 mm, cw 9.0 mm) from Las Perlas Islands, Panama (MZUSP 33890), dorsal (A) and ventral (B) views [photographs by AA].

FIGURE 35. Petrolisthes agassizii Faxon, 1893:A, B, ovigerous female (cl cw indet.) from Taboga Island, Panama (not deposited), dorsal (A) and ventral (B) views; C, D, ovigerous female (cl cw indet.) from the same locality (not deposited), dorsal (C) and ventral (D) views [photographs by AA].