Munida bapensis Hendrickx, 2000

Hendrickx, Michel E., 2012, Squat lobsters (Crustacea: Decapoda: Galatheoidea and Chirostyloidea) collected during the TALUD XIV cruise in the Gulf of California, Mexico, and rediscovery of Gastroptychus perarmatus (Haig, 1968) in the eastern Pacific, Zootaxa 3418, pp. 28-40 : 33-35

Munida bapensis Hendrickx, 2000

( Fig. 4 )

Munida bapensis Hendrickx, 2000: 165 , fig. 3; 2003: 133 (key); 2008: 48, fig. 1. — Baba 2005: 259 (list). — Fierro et al. 2008: 5 (list). — Baba et al. 2008: 88 (list).

Material examined. TALUD XIV. St. 4. (28°11'27"N, 112°32'06"W), 7 Apr 2011, 175 males (CL 9.9–30.5 mm; CLr 13.6–44.05 mm) (EMU-8933), 28 females (CL 7.7–19.8 mm; CLr 11.2–28.7 mm) (EMU-8950), and 107 ovig. females (CL 15.8–24.7 mm; CLr 22.0– 35.3 mm) (EMU-8934), 435–451 m, benthic sledge. Same station, 12 males (CL 12.2–32.0 mm), 2 females (CL 7.0 and 16.3 mm), and 14 ovig. females (CL 16.2–22.4 mm) (EMU-9289). St. 8 (28°17'06"N, 112°33'39"W), 8 Apr 2011, 18 males (CL 11.3–31.9 mm; CLr 14.9–44.5 mm), 9 females (CL 13.5–17.4 mm; CLr 19.0– 23.4 mm), and 9 ovig. females (CL 17.9–25.2 mm; CLr 25.0– 33.8 mm), 520–557 m, Agassiz dredge (EMU-8935). St. 9 (28°20'04"N, 112°21'33"W), 8 Apr 2011, 2 males (CL 10.9 and 15.5 mm; CLr 15.1 and 20.5 mm) 822–915 m, benthic sledge (EMU-9443). St. 12 (28°15'19''N, 112°13'57''W), 8 Apr 2011, 4 males (CL 8.5–14.8 mm; CLr largest male, 22.3 mm), one female (damaged), and 4 ovig. females (CL 19.2–24.1 mm; CLr 27.2–34.1 mm), 286–289 m, Agassiz dredge (EMU-8936). St. 14 (28°35’32”N, 112° 27’53”W), 8 Apr 2011, 11 males (CL 12.6–29.9 mm; CLr 16.4–41.9 mm), 4 females (CL 11.1–14.2 mm; CLr 15.9–20.9 mm), and 4 ovig. females (CL 18.2 mm; CLr 25.7–27.3 mm), 305–316 m, benthic dredge (EMU-8937). St. 19 (28°37’37”N, 112°41’05”W), 9 Apr 2011, 1 female (CL 13.3 mm; CLr 19.9 mm), 560–580 m, benthic sledge (EMU-8938). St. 20 (28°46'29"N, 112°45'40"W), 9 Apr 2011, 1 male (CL 12.7 mm; CLr 19.8 mm), and 1 ovig. female (CL 20.4 mm; CLr 29.0 mm), 410–414 m, benthic sledge (EMU-8939). St. 27 (29°08’53”N, 113°25’28”W), 10 Apr 2011, 1 male (CL 15.9 mm; CLr 22.9 mm), 860–907 m, benthic sledge (EMU-9444).

Color. As described by Hendrickx (2008). Carapace and legs orange. Rostrum orange dorsally, whitish ventrally; supraocular spines whitish. Tip of spines on chelipeds and walking legs whitish; ventral part of dactylus of walking legs whitish.

Size and fecundity. Of the 408 specimens collected during the TALUD XIV cruise, 54% are males and 46% females (34% ovigerous). Ovigerous females range from 15.8/22.0 mm to 25.2/ 33.8 mm (CL/CLr). Number of eggs vary from 268 to 1884 per female (10 females with CL from 15.9 to 24.7 mm) and is size-related ( Table 2). Egg size, 0.59–0.68 mm (based on 20 eggs of largest female).

16.6 297

19.0 1068

21.2 1033

22.3 951

22.6 1311

23.3 1884

23.9 1487

24.0 1596

24.7 1643

Remarks. The largest male examined is CLr 44.5 mm and is larger than previously reported ( Hendrickx 2008). The rediscovery of M. bapensis in samples of the TALUD X cruise in 2007 (488 specimens in one sample; Hendrickx 2008) and present material (405 specimens in six samples) undoubtedly indicate that this species is one of the most abundant galatheids in the northern part of the central Gulf of California.

Ecology. The material collected during the TALUD XIV cruise was found in the following epibenthic environmental conditions: depth, 286–915 m; temperature, 6.8–12.7°C; dissolved oxygen concentration, 0.18–1.45 ml O2/l (Table 1), with five records out of eight in oxygen values <0.54 ml O2/l. The most abundant sample (St. 4) corresponds to 0.21 ml O2/l, in severe hypoxic conditions.

Figures

FIGURE 4. Munida bapensis Hendrickx, 2000, male, dorsal view. TALUD XIV, Station 4 (CLr ca 40 mm) (EMU- 8933).