Chasmocarcinus longipes Garth, 1940

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182: 23-25

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http://doi.org/10.11646/zootaxa.4209.1.1

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scientific name

Chasmocarcinus longipes Garth, 1940
status

 

Chasmocarcinus longipes Garth, 1940 

( Figs. 4View FIGURE 4 F; 22C; 29F; 36I, J; 50B; 57B; 65E‒H; 85A; 89G; 100A, B)

Chasmocarcinus longipes Garth, 1940: 90  , pl. 26 [type localilty: Gulf of Chiriquí, Panama]; 1948: 52 [Panama, Colombia, Ecuador].—von Prahl 1986:98 [Colombia]—Lemaitre & Álvarez León 1992: 55 [in list].— Hendrickx 1995: 139 [in list].—Ng et al. 2008: 76 [in list].

Chasmocarcinus panamensis Serène, 1964a: 258  , fig. 19, pl. 23, figs. A, B. [Gulf of Panama].—Ng et al. 2008: 76 [in list].

Type material. Holotype female (8.3 × 10.0 mm) (LACM-CR-1938.1), Panama, Gulf of Panama, Secas Is., Allan Hancock Expedition of 1938, Velero III, stn 865-38, 5.4 m, 0 2.03.1938. 

Paratypes: ALLAN HANCOCK EXPEDITIONS: 1 male (5.5 × 6.4 mm), 1 female (5.6 × 6.8 mm) ( USNMAbout USNM 78785View Materials), Colombia, Puerto Utría , Velero III, stn 233-34, 37 m, 14.02.1934  ; 3 males (4.2 × 5.7 mm, 5.0 × 6.2 mm, 5.4 × 6.9 mm) (LACM-CR-1934.1), stn 233-34, 14.02.1934.

Other material examined. Panama. MONSUNEN EXPEDITION (1933-1934) (holotype male of Chasmocarcinus panamensis Serène, 1964  ) (6.9 × 8.0 mm) ( ZMUCAbout ZMUC CRU- 7697), Isla del Rey , Pearl Is., Gulf of Panama, 5.01.1934.  —ALLAN HANCOCK EXPEDITION (1934): 1 male (5.0 × 5.9 mm), 1 female (5.0 × 5.9 mm) ( MBPC 16364), Bahía Honda, stn 248-34, 46– 55 m, 22.02.1934  .— ALLAN HANCOCK EXPEDITION (1938): holotype female (8.3 × 10.0 mm) ( LACMAbout LACM), Secas Is., Velero III, stn 865-38, 5.4 m, 02.03.1938.— 5 males (largest 6.8 × 5.8 mm)  , 3 females (largest 8.0 × 6.1 mm) ( ZRCAbout ZRC 2013.1418View Materials), Bay of Panama, Urica , stn 2, 07°24.4’N, 80°13.7’W, 15.02.2007GoogleMaps  .

Colombia. ALLAN HANCOCK EXPEDITION (1934): 1 male (3.9 × 4.8 mm), stn 232-34, shore ( MBPC 16365)  ; 1 male (5.8 × 7.0 mm), 1 female (4.1 × 5.0 mm) ( MBPC 16366), Cobita Bay , stn 230-34, 54.6 m, 14.02.1934. 

Ecuador. ALLAN HANCOCK EXPEDITION (1934): 1 male (5.6 × 6.6 mm), 1 female (5.6 × 7.2 mm) (MBPC16367), Cape San Francisco, stn 216-34, 36.4 m, 11.02.1934.

Diagnosis. Carapace ( Figs. 4View FIGURE 4 F; 100A, B; Garth 1940: pl. 26, fig. 1) with granular ridge along anterolateral margins. Orbits ( Fig. 22View FIGURE 22 C; Garth 1940: pl. 26, fig. 5) long, eye peduncles proportionally long. Epistome ( Fig. 22View FIGURE 22 C) with salient, trapezoid median lobe with median fissure, lateral margins straight to slightly curved. Antennular articles relatively short ( Fig. 22View FIGURE 22 C). Third maxilliped ( Fig. 29View FIGURE 29 F; Garth 1940: pl. 26, fig. 4; Serène 1964a: fig. 19c, as C. panamensis  ) merus ovate; ischium rectangular, longer than merus. Bulging pterygostomial region, clearly visible from dorsal view. Fingers of major chela of large males ( Figs. 36View FIGURE 36 I; 100B; Garth 1940: pl. 26, figs. 2, 3) proportionally short, only slightly longer than enlarged propodus in dorsal view; pollex as long as dactylus; few large teeth, slightly larger proximally. Fingers of minor  chela of both sexes ( Fig. 36View FIGURE 36 J) scissor-like; with small, sharp teeth. Anterior margin of ventral surface of propodus, proximal portion of pollex of major chela of large males smooth, without tufts of long setae. Inner margin of cheliped carpus ( Fig. 4View FIGURE 4 F; Garth 1940: pl. 26, fig. 1) with low, blunt tooth (smooth in small individuals). Ambulatory legs ( Fig. 4View FIGURE 4 F; Garth 1940: pl. 26, fig. 1) proportionally short, folded P5 merus only reaching middle portion of anterolateral margin. Fused thoracic sternites 1, 2 ( Fig. 50View FIGURE 50 B) broadly triangular, proportionally wide, short. Male pleon ( Figs. 50View FIGURE 50 B, 57B) with proportionally long, narrow telson. G1 ( Fig. 65View FIGURE 65 E‒G; Serène 1964a: fig. 19c, as C. panamensis  ) slender, long, nearly straight, not expanded distally, with only few spinules on distal end. G2 ( Fig. 65View FIGURE 65 H; Serène 1964a: fig. 19c, as C. panamensis  ) shorter than G1, with short distal segment. Female pleon ( Fig. 85View FIGURE 85 A) with lateral margins of somites strongly convex; telson proportionally short. Sterno-pleonal cavity of female ( Fig. 89View FIGURE 89 G) moderately shallow, vulvae close together.

Colour. The carapace is yellowish beige in life, the chelipeds and ambulatory legs white ( Fig. 100View FIGURE 100 A, B).

Remarks. Garth (1940: 53) remarked that the morphology of the chelipeds and ambulatory legs can be used to distinguish C. longipes  from the often sympatric C. latipes  , especially the stout legs of C. latipes  and the high propodus of the major chela of large males of C. longipes  . Diagnostic for C. longipes  is a bulging pterygostomial region as in its Atlantic congeners and different from the gently convex region of C. latipes  , and the orbits are conspicuously long ( Fig. 22View FIGURE 22 C). Also characteristic of C. longipes  is an epistome with slightly curved lateral margins ( Fig. 22View FIGURE 22 C) similar to C. latipes  , its eastern Pacific congener, but different from the straight lateral margins of all Atlantic congeners.

Garth (1948: 91, pl. 26, fig. 5) stated in the description of the species that the epistome is “diamond shaped”, but the illustration of the female holotype shows a trapezoid median lobe as in all specimens examined.

Serène (1964a) was obviously unaware of Garth’s description of C. longipes  as a new species ( Garth 1940). It was not listed on his list of species of Chasmocarcinus ( Serène 1964a: 258)  nor in differences between his new species and other species of Chasmocarcinus  (detailed differences in contrast to four species, all from the Western Atlantic) nor Garth’s reference at the end of the paper.

Distribution. Tropical Eastern Pacific: Costa Rica to Ecuador. Depth: “shore”— 90 m.

USNM

Smithsonian Institution, National Museum of Natural History

ZMUC

Zoological Museum, University of Copenhagen

LACM

Natural History Museum of Los Angeles County

ZRC

Zoological Reference Collection, National University of Singapore

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Chasmocarcinidae

Genus

Chasmocarcinus

Loc

Chasmocarcinus longipes Garth, 1940

Ng, Peter K. L. & Castro, Peter 2016

2016
Loc

Chasmocarcinus longipes

Hendrickx 1995: 139
Prahl 1986: 98Garth 1940: 90

1986
Loc

Chasmocarcinus panamensis Serène, 1964a : 258

Serene 1964: 258