Brachyura of the Pacific coast of America Oxyrhyncha, Genus Libinia -- Key to the Pacific American species of Livinia, p. 322 |
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322 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21
Genus LIBINIA Leach
Libinia Leach, 1815a, p. 129. Milne Edwards, 1834, p. 298. Rathbun,
1892, p. 235 (part: not L. macdonaldi or L. spinimana) ; 1925, p.
310.
Type: The Atlantic Libinia emarginata Leach, 1815, by monotypy.
Description: Carapace convex; tuberculous or spinous; triangular-
orbiculate and evenly rounded behind the frontal region. Preocular spine
usually distinct. Rostrum emarginate or bifid at the apex. Orbits small,
nearly circular, with a superior fissure closed or nearly so, and a closed
fissure or an open sinus below. Basal antennal segment moderately enlarged. Merus of external maxillipeds truncate at distal end. Chelipeds
well developed; palm elongate; fingers evenly denticulate on inner margins. Ambulatory legs well developed, sometimes elongate, diminishing
in length from first to fourth pair; segments subcylindrical, usually unarmed. (Rathbun, 1925)
Abdomen composed of seven articles in the two sexes. (Milne Edwards)
Range: Pacific Ocean from Playa Maria Bay to Magdalena Bay,
Lower California, and from near mouth of Colorado River to San
Ignacio Bay, Gulf of California, Mexico; vicinity of Paita, Peru. Shore
to 51 fathoms. Atlantic Ocean from Windsor, Nova Scotia, to Gulf of
San Matias, Patagonia; questionably from Bermuda; Gaboon, West
Africa. In the Atlantic to 68 fathoms.
Key to the Pacific American Species of Libinia
la. Rostral horns strongly divergent. Two large teeth on basal antennal article. Lateral margin strongly rimmed. Merus of cheliped armed with spines and tubercles. Male first pleopod stout,
keel not equally advanced with tip. Southern Hemisphere
. . . rostrata
lb. Rostral horns not divergent. Only one tooth on basal antennal
article. Lateral margin not strongly rimmed. Merus of cheliped
unarmed. Male first pleopod slender, keel equally advanced with
tip in old specimens. Northern Hemisphere
2a. Rostrum short, ascending. Median spines 8; hepatic spines
2. Tip of male abdomen triangular ... . setosa
2b. Rostrum longer, horizontal. Median spines 6; one hepatic
spine. Tip of male abdomen rounded . . . mexicana
Object Description
Description
| Title | Brachyura of the Pacific coast of America Oxyrhyncha, Genus Libinia -- Key to the Pacific American species of Livinia, p. 322 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-21-01~334.tiff |
| Full text | 322 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 Genus LIBINIA Leach Libinia Leach, 1815a, p. 129. Milne Edwards, 1834, p. 298. Rathbun, 1892, p. 235 (part: not L. macdonaldi or L. spinimana) ; 1925, p. 310. Type: The Atlantic Libinia emarginata Leach, 1815, by monotypy. Description: Carapace convex; tuberculous or spinous; triangular- orbiculate and evenly rounded behind the frontal region. Preocular spine usually distinct. Rostrum emarginate or bifid at the apex. Orbits small, nearly circular, with a superior fissure closed or nearly so, and a closed fissure or an open sinus below. Basal antennal segment moderately enlarged. Merus of external maxillipeds truncate at distal end. Chelipeds well developed; palm elongate; fingers evenly denticulate on inner margins. Ambulatory legs well developed, sometimes elongate, diminishing in length from first to fourth pair; segments subcylindrical, usually unarmed. (Rathbun, 1925) Abdomen composed of seven articles in the two sexes. (Milne Edwards) Range: Pacific Ocean from Playa Maria Bay to Magdalena Bay, Lower California, and from near mouth of Colorado River to San Ignacio Bay, Gulf of California, Mexico; vicinity of Paita, Peru. Shore to 51 fathoms. Atlantic Ocean from Windsor, Nova Scotia, to Gulf of San Matias, Patagonia; questionably from Bermuda; Gaboon, West Africa. In the Atlantic to 68 fathoms. Key to the Pacific American Species of Libinia la. Rostral horns strongly divergent. Two large teeth on basal antennal article. Lateral margin strongly rimmed. Merus of cheliped armed with spines and tubercles. Male first pleopod stout, keel not equally advanced with tip. Southern Hemisphere . . . rostrata lb. Rostral horns not divergent. Only one tooth on basal antennal article. Lateral margin not strongly rimmed. Merus of cheliped unarmed. Male first pleopod slender, keel equally advanced with tip in old specimens. Northern Hemisphere 2a. Rostrum short, ascending. Median spines 8; hepatic spines 2. Tip of male abdomen triangular ... . setosa 2b. Rostrum longer, horizontal. Median spines 6; one hepatic spine. Tip of male abdomen rounded . . . mexicana |
| Archival file | hancockunpub_Volume32/AHF-PUB-PE-21-01~334.tiff |
