AMBLER: SPECIES OF Wt/MDOPS/S OFF OREGON 



9a. Thin, unarmed rostrum strongly upturned beringana 



9b. Triangular rostrum armed with spines or teeth, not upturned 10 



10a. Rostrum armed laterally with two to four small spines; carapace covered with crenulated 

 (margin cut into rounded scallops) tubercles; eyespines long, anterolateral spine about 

 same size as first lateral spine tuftsi 



10b. Rostrum armed laterally with minute teeth; carapace covered with semicircular scalelike 

 tubercles with long setae; eyespines short; anterolateral spine larger than first lateral 

 spine subsquamosa 



11a. Rostrum triangular without dorsal carina; large spine on second, third, and fourth abdom- 

 inal segments verrucosus 



lib. Rostrum wide at base, nearly parallel to eyestalks, with dorsal carina; abdomen with no 



large spines latirostris 



Munidopsis quadrata Faxon 1893 



Munidopsis quadrata Faxon 1893:1888 (original 

 description); Faxon 1895:97 (redescription), pi. 

 23,fig. 1, le. 



Elasmonotus quadratus Milne-Edwards and 

 Bouvier 1894:281-282 (under discussion of 

 genus Elasmonotus, key to Elasmonotus). 



Material— OSVBl 00170, gravid female, 11 mm 

 CL, stn NAD 11, 44°39.0' N, 124°59.9' W, BMT 

 312, 950 m; OSUBI 00171, male, 13 mm CL, stn 

 Waldpt., 44°21.7' N, 125°07.9' W, OT 27, 1,000 m; 

 OSUBI 00182, gravid female, 12 mm CL, male, 11 

 mm CL, stn NAD 12, 44°38.8' N, 125°09.1 ' W, 0TB 

 360, 1,170 m; OSUBI 01580, 2 specimens, stn 

 DWD 5, 48°38.1 ' N, 126°58.1 ' W, BMT 9, 2,189 m. 



Distribution. — The range of Munidopsis quad- 

 rata extends from off Destruction Island, Wash., to 

 Tres Marias Islands, Mexico, at depths usually 

 between 620 and 1 ,57 1 m; it has also been found at 

 86 and 110 m, off Wilmington, Calif., and Los 

 Coronados Islands, respectively (Rathbun 1904). 

 These shallow records (86 and 110 m) seem un- 

 likely when compared with the usual depth range 

 of 620-1,571 m, although other species of 

 Munidopsis do occur on the Continental Shelf. 

 Munidopsis quadrata occurs on the continental 

 slope off Oregon and on the Nitinat Fan off 

 Washington at 950-2,189 m, which extends the 

 known depth range. 



Munidopsis aries (Milne-Edwards 1880) 



Orophorhynchus aries Milne-Edwards 1880:58 

 (original description); Milne-Edwards and 



Bouvier 1897:111-113 (redescription), pi. 9. 

 Munidopsis aries. Benedict 1902:316 (genus 

 changed to Munidopsis). 



Materia/.— USNM 171346, female, 43 mm CL, stn 

 CP-2-E, 44°38.4' N, 126°42.0' W, BMT 270, 2,850 

 m; OSUBI 00169, female, 29 mm CL, stn CP-3-E 

 Channel, 44°44.4 ' N, 127°22.1 ' W, BMT 359, 3,025 

 m. The holotype was not examined. 



Remarks. — This species is known from only three 

 specimens — the type and two Oregon specimens 

 (Table 1). Munidopsis sundi and M. albatrossae , 

 both giant species, are most similar to M. aries in 

 shape and ornamentation of the carapace. 



The description of M. aries (Milne-Edwards and 

 Bouvier 1897) fits the Oregon specimens except for 

 the chelipeds. In the Oregon specimens, the merus 

 of the cheliped has four small spines at the an- 

 terior border and a row of small spines along the 

 dorsal ridge; the carpus has four or five small 

 spines on the dorsal surface with two or three of 

 these at the anterior border. Milne-Edwards and 

 Bouvier (1897) described two denticles at the an- 

 terior border of the merus and the carpus. They did 

 not describe the inner margin of the merus of the 

 third maxilliped. In the Oregon specimens three 



Table l. — Morphometry of Munidopsis aries. Data on holotype 

 from Milne-Edwards and Bouvier (1897). 



17 



