Description Oregonia bifurca

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abdomen of male


the carapace oblong in shape, three-fourths wide long. narrower @ anterior end. 2 small spines present @ posterior margin of eye orbit (the postorbital spines). basal segments of antennae narrow , have small , stout forward-pointing spines, smaller spines on outer , inner margins. rostrum divided 2 short, flat, , gradually tapering horns, hence common name split-nose . measure 5 mm (0.20 in) long in males , 3.4 mm (0.13 in) long in females, , similar in shape postorbital spines. upper , lower surfaces of body covered densely small protuberances (tubercles) soft , long yellow hairs curve @ tip. abdomen (pleon) composed of 7 distinct segments.


the appendages of males slender , covered dense long yellow curving hairs interspersed shorter , finer hairs. claw-bearing legs (chelipeds, first pereiopod pair) longer , elongated in males in females. male chelipeds grow length of 62 mm (2.4 in) claws (chelae) making 25.6 mm (1.01 in). arm (merus) of chelipeds has 2 rows of spines on inner margins, longer on lower margin on upper margin. on inner edge of palm (manus) 4 lengthwise rows of small spinules. fixed finger (pollex) of claw possesses large tooth fits groove in movable finger (dactylus). have slight gape when closed fully, two-fifths of length base. same length palm. walking legs (the rest of pereiopods) gradually become shorter relative each other front-to-back, lengths of approximately 59 mm (2.3 in), 56 mm (2.2 in), 51 mm (2.0 in), , 46 mm (1.8 in) respectively. chelipeds in males longer first pair of walking legs. first pair of pleopods of males enlarged @ tips , possess rows of long filaments.


the appendages of females covered in dense long yellow curving hairs interspersed shorter , finer hairs. female chelipeds shorter in males, growing 37 mm (1.5 in). 1 , half times long carapace. arm of chelipeds has row of short blunt spines on inner edge. palm of claws same length fingers, , longer arm. fixed finger , moveable finger fit closely , possess small teeth. unlike in males, cheliped shorter first walking leg 50 mm (2.0 in) in length. rest of walking legs decrease in length front-to-back, in males.


oregonia bifurca can readily distinguished o. gracilis in having shorter rostral horns curve away each other, triangular postorbital spines closer eyes , pointing more forward, wider front end of carapace, , long , slender dactyli on walking legs. tuberculation in o. bifurca finer in o. gracilis.








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