Pasiphaea cristata

Super Group: 
Opisthokonta
Phylum: 
Arthropoda
Sub-Phylum: 
Crustacea
Class: 
Malacostraca
Sub-Class: 
Eumalacostraca
Order: 
Decapoda
Sub-Order: 
Pleocyemata
Family: 
Pasiphaeidae
Genus: 
Pasiphaea
Species: 
cristata
Authority: 
Bates 1888

Diagnosis

Diagnosis_Species: Laterally compressed. Carapace one-fourth the length of the animal, measured from the frontal margin to the extremity of the telson; dorsal surface rounded, not carinated; frontal margin not advanced to a rostrum between the ophthalmopoda, frontal region in the median line elevated, with a laterally compressed triangular crest. Orbits imperfectly excavate and defined by an outer obtusely pointed canthus, beneath which, but less advanced, is the rounded projection that represents the first antennal tooth, and still more retiring is a distinct and well-formed tooth that corresponds with the second pair of antennae, beneath with the frontal margin still recedes and unites with the lateral margin, forming an abtuse angle, from which posteriorely the sides of the carapace gradually deepen.
Pleon dorsally smooth, rounded, and laterally compressed; first somite shorter than the succeeding, second and three following subequal, and sixth much longer than the preceding. Telson about half the length of the sixth somite.
Ophthalmopoda moderately broad.
First pair of antennae having a stylocerite that is sharply pointed, and nearly as long as the first joint of the peduncle, second and third joints cylindrical and subequal in length, being about half the length of the first joint, flagella subequal in length, upper stout at the base.
Second pair of antennae having a scaphocerite that is half as long again as the peduncle of the first pair, narrow and lanceolate; flagellum long and slender.
Anterior two pairs of pereiopoda having the chelae long and narrow, the second pair having the fingers longer than those of the first; in both they cross each other when closed. Following three pairs small, feedle, carrying a strong stiff basecphysis. Pleopoda stout, except the terminal pair, which is longer than the telson.
Body_adults_length: 68 mm

Type illustration / Type locality / Type specimen

Type locality: off Matuku, Fidji Island, station 173 (Challenger expedition), July 24, 1874. Lat. 19° 9' 35'' S, long. 179° 41' 50'' E. depth 315 315 fathoms.

Mode of locomotion

Motility: motile_swimming

Observation site(s)

SYMBIONTS

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Association with... Region origin Name of site In reference...
Staphylocystis racemosus