Pisidia magdalenensis ( Glassell, 1936 )

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 : 122-127

Pisidia magdalenensis ( Glassell, 1936)

( Figs. 78 , 79 )

Porcellana magdalenensis Glassell 1936: 295 ; Glassell 1938: 431, pl. 32; Haig 1957b: 13.

Pisidia magdalenensis . — Haig 1960: 209, fig. 10, pl. 38, fig. 4; Haig 1962: 187; Gore & Abele 1976: 25; Gore 1982: 21; Werding & Haig 1982: 69; Lazarus-Agudelo & Cantera-Kintz 2007: 230; García-Madrigal & Andréu-Sánchez 2009: 43; Moscoso 2012: 82.

(?) Pisidia species. — Gore & Abele 1976: 25.

Material examined. Panama [ Pacific ]: 1 male, cl 3.3, cw 3.4 ( FLMNH UF 57719 ) , Azuero Peninsula , north of Búcaro de Tonosí , Puerto Vapor (Puerto Cañas), 7°21’41.1”N, 80°21’56.5”W, estuary, outer mudflat, low tide, under dead wood log, leg. P.P.G. Pachelle, 16.02.2019 (fcn PAN-026); 1 male, cl 2.5, cw 2.4 ( FLMNH UF 57158 ) , Coiba Is., Isla Coiba , eastern coast, northern end of Bahía Damas, 7°30’55.5”N, 81°40’23.3”W, depth less than 8 m, in Pocillopora rubble, leg. M. Leray et al., 19.02.2019, (fcn PAN-134); 1 male, cl 3.8, cw 3.7 ( MZUSP 33469 ) , Río Mar , rocky intertidal exposed at low tide, leg. A. Anker, J.F. Lazarus-Agudelo & T. Kaji, 20.03.2015; 3 males, cl 3.7, cw 3.9, cl 3.6, cw 3.6 and cl 3.1, cw 3.5, 2 ov. females, cl 3.5, cw 3.6 and cl 3.0, cw 3.2 ( MZUSP 33449 ) , same collection data as for previous specimen; 3 males, cl 2.7, cw 2.3, cl 2.8, cw 2.4 and cl 2.0, cw 1.9 ( MZUSP 40070 ) , Isla Venao , 08°52’48.6”N, 79°35’36.9”W, leg. L.R.L. Simone, 01.02.2006; 1 male, cl 4.5, cw 4.1 ( FLMNH UF 57159 ) , Las Perlas Is., Isla Contadora , reef near Playa Larga, 8°37’59.4”N, 79°01’52.9”W, under rocks, leg. P. Pachelle & M. Leray, 22.03.2019 (fcn PP 19-037); 1 female, cl 4.6, cw 4.5 ( FLMNH UF 57160 ) , Las Perlas Is., Isla Saboga , 8°37’42.4”N, 79°03’24.4”W, rocky intertidal, under rocks, leg. P.P.G. Pachelle & M. Leray, 23.03.2019 (fcn PP 19-070) .

Previous records from Panama. Glassell (1938); Haig (1957b, 1960, 1962, 1968); Gore & Abele (1976); Gore (1982).

Distribution. East Pacific: Mexico, Guatemala, Nicaragua, Costa Rica, Panama (Coiba Is., Bahía Honda in Veraguas, Azuero Peninsula, Isla Venao, Taboga Is., Melones I., vicinity of Ciudad de Panamá, including Amador Causeway, Las Perlas Is.), Colombia, Ecuador and Peru ( Haig 1960, 1962; Gore 1982; Moscoso 2012; present study).

Ecology. Intertidal and subtidal, known depth range: 0–76 m; rocky shores and hard or mixed bottoms with coralline algae and coral rubble; among rocks, rubble, polychaete cavities, algae, among hydroids, gorgonians, scleractinian corals (dead and living Pocillopora ), sometimes associated with holothurians or hermit crabs, e.g. Petrochirus californiensis Bouvier ( Haig 1960; Gore & Abele, 1976; Parente & Hendrickx 2000; Moscoso 2012).

Remarks. Pisidia magdalenensis is one of the most abundant porcelain crabs in the tropical eastern Pacific, especially in more offshore conditions ( Gore 1982). It is also one of the most variable porcelain crabs in terms of general background colouration and colour pattern ( Figs. 78 , 79 ).

Genus Polyonyx Stimpson, 1858

Figures

FIGURE 78. Pisidia magdalenensis (Glassell, 1936): A, male (cl 3.3 mm, cw 3.4 mm) from Azuero Peninsula, Panama (FLM- NH UF 57719), dorsal view [photogragh by AA]; B, female (cl 4.6 mm, cw 4.5 mm) from Las Perlas Islands, Panama (FLMNH UF 57160), dorsal view [photograph courtesy of Paulo P.G. Pachelle].

FIGURE 79. Pisidia magdalenensis (Glassell, 1936): A, extra-limital specimen, female (cl cw indet.) from Bahía Málaga, Colombia (CRBM-UV), dorsal view; B, C, extra-limital specimen, ovigerous female (cl cw indet.) from the same locality (CRBM- UV); D, E, two individuals of unknown sex from Taboga Island, Panama (not deposited), dorsal view [photograghs by AA].