Pylopaguridium markhami McLaughlin & Lemaitre, 2001

Lemaitre, Rafael, 2020, New and rare micro-pagurid hermit crabs (Crustacea: Anomura: Paguridae) from the Caribbean Sea and Gulf of Mexico, Zootaxa 4722 (4), pp. 301-325 : 320-323

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Pylopaguridium markhami McLaughlin & Lemaitre, 2001


Pylopaguridium markhami McLaughlin & Lemaitre, 2001

( Figs. 11C, D View FIGURE 11 , 15–17 View FIGURE 15 View FIGURE 16 View FIGURE 17 )

Pylopaguridium markhami McLaughlin & Lemaitre, 2001: 472 , figs 14c, d, 15, 16; Lemaitre & McLaughlin, 2003: 467; McLaughlin et al. 2010: 35.

Material examined. Bocas del Toro Province, Panama, Caribbean Sea : 1 male 1.6 mm, Punta Puebla, 9.367°N, 82.291°W, BBDT-0608, BCS2016–012, 4–4.5 m, lagoon fringing reef, Agaricia reef framework, 16 May 2016, colls M. Leray, F. Michonneau, R GoogleMaps . Lasley ( UF 044314 View Materials ); 1 female 1.0 mm, 1 imm sex indet 0.9 mm, runway, 9.342°N, 82.260°W, BBDT-2089, BCS2016–034, 4–4.5 m, lagoon fringing reef, Agaricia reef framework, 23 May 2016, colls M. Leray, F. Michonneau, R GoogleMaps . Lasley ( UF 044399 View Materials ); 1 male 1.4 mm, same station data as previous, BBDT- 1279, BCS2016–023 ( UF 044396 View Materials ); 8 males 1.3–2.2 mm, 3 females 1.6–2.1 mm, 3 ov females 1.4–2.1 mm, Seagal, 9.289°N, 82.296°W, BBDT-2888, BCS2016–043, 3–3.5 m, lagoon fringing reef, Agaricia reef framework, 27 May 2016, colls M. Leray, F. Michonneau, R GoogleMaps . Lasley ( UF 044528 View Materials ) .

Recognition characters. Shield ( Fig. 15A View FIGURE 15 ) slightly to distinctly longer than broad; lateral projections prominent, acutely subtriangular, reaching beyond level of tip of rostrum, terminating in sharp marginal or submarginal spine. Rostrum obtusely subtriangular, terminating in sharp spine. Ocular peduncles moderately long and slender, approximately 0.8 as long as shield, each with median bristle-like seta on mesial surface; corneas weakly dilated. Ocular acicles multifid, each terminating in 4 or 5 slender spines. Antennular and antennal peduncles reaching to distal margin of corneas; antennal acicles curving outwards, terminating in strong spine, with few setae mesially. Chelipeds nearly similar in length but distinctly dissimilar in strength and spination; right ( Fig. 16A, B View FIGURE 16 ) approxi- mately twice as wide as left, sparsely setose, chela with numerous blunt spines or tubercles on dorsal surface, carpus with dorsolateral and dorsomesial row of spines; left ( Fig. 16C, D View FIGURE 16 ) sparsely setose, chela with scattered small tubercles on dorsal surface, carpus with dorsal row of well-spaced spines. Pereopods 2 and 3 ( Fig. 17 View FIGURE 17 A–D) similar from left to right; sparsely setose, lacking spines except for ventromesial row of 7 or 8 corneous spinules increasing in size distally on each dactyl. Pereopod 4 ( Fig. 16E View FIGURE 16 ) lacking preungual process on dactyl; propodal rasp ( Fig. 17E View FIGURE 17 ) with 1 row of ovate scales. Anterior lobe of sternite XI (of pereopods 3; Fig. 15B View FIGURE 15 ) rounded, armed with 1 or 2 small spines anteriorly. Uropods strongly asymmetrical, left largest. Telson ( Fig. 15C View FIGURE 15 ) nearly symmetrical, longer than broad, with distinct lateral indentations; posterior lobes separated by deep U-shaped median cleft, posterior margins nearly straight or slightly oblique, each armed with 3 or 4 spines.

Color ( Fig. 11C, D View FIGURE 11 ). Shield mostly cream-white with somewhat darker portions laterally, and light brown region one each side of anterior half. Ocular peduncles cream-white dorsally, faded purple ventrally; cornea white with reddish spots. Antennular peduncles blue; upper flagella reddish ventral portion. Antennal peduncles cream-white in background, with second segment having brownish portions laterally and mesially, acicle with distal brownish band; flagella dark brown with approximately 8 short white bands. Right chela with dactyl and fixed finger white with brownish teeth, palm with faded to brownish spines over whitish background. Left cheliped white, palm with dark brown region distomedially and distomesially; carpus and merus brown with lateral and mesial faces mostly brown. Pereopods 2 and 3 (ambulatory legs) white with short dark brown stripes as follows; 1 dorsomedially on basal portion of dactyl, and 3 medially on dorsal, lateral and mesial faces of merus, carpus and propodus.

Distribution. Caribbean Sea, from the Turk and Caicos Islands in the Bahamas, off eastern Honduras, and now Bocas del Toro, Panama. Depth: 3– 36 m.

Remarks. This species is included in the “ Pylopagurus-Tomopagurus ” group, and prior to this study, was known exclusively from the specimens used in the original description by McLaughlin & Lemaitre (2001) from the Bahamas and off eastern Honduras. Subsequently, this species was listed in a taxonomic summary of the “ Pylopagurus-Tomopagurus ” group of genera and species ( Lemaitre & McLaughlin 2003), and in a checklist of the Paguroidea of the world ( McLaughlin et al. 2010). The presence of Pylopaguridium markhami in Bocas del Toro, Panama, in the southwestern Caribbean Sea, amplifies even more its distribution in the West Indian region.

The original description of Pylopaguridium markhami included partial and somewhat unfocused photographs of the dorsal aspect of the left and right cheliped of a female, illustrations of various body parts of a male, and sternite XIII and first gonopods of a female ( McLaughlin & Lemaitre 2001: figs. 14c, d, 15). Herein are included illustrations of a female (shield length = 2.1 mm, UF 044528 View Materials ) from Bocas del Toro, Panama, showing all diagnostic aspects with more complete details and views.


Departamento de Geologia, Universidad de Chile


Florida Museum of Natural History- Zoology, Paleontology and Paleobotany














Pylopaguridium markhami McLaughlin & Lemaitre, 2001

Lemaitre, Rafael 2020

Pylopaguridium markhami

McLaughlin, P. A. & Komai, T. & Lemaitre, R. & Rahayu, D. L. 2010: 35
Lemaitre, R. & McLaughlin, P. A. 2003: 467
McLaughlin, P. A. & Lemaitre, R. 2001: 472