Hyperia macrocephala Dana, 1853
- Dataset
- Pelagic Invertebrates
- Rank
- SPECIES
Classification
- class
- Crustacea
- order
- Amphipoda
- family
- Hyperiidae
- genus
- Hyperia
- species
- Hyperia macrocephala
diagnostic
The height of the head is more than half the length of the pereon and its length equal to somites I and II together. Antennae I and II in females are approximately equal in length and half the height of the head. The outer lobes of the maxillipeds are armed with only short setae and the inner lobes are shorter than the outer. Coxal plates IV in adult specimens are acute and project sideward. Pereopods I and II are approximately equal in length; the 2nd segment is broadened; the 3rd and 4th segments are short and the posterior distal angle of the 4th produced into a small lobe, which is better developed in pereopods II; the 5th segment is broadened, with a strictly truncate distal margin, and obconical; the 6th segment is approximately equal to the 5th in length but much narrower; the claw is straight. Pereopods III and IV are much longer than pairs I and II; the 2nd segment is broadened; the 5th segment is somewhat shorter than the 3rd and 4th segments together; the 6th segment is narrower but distinctly longer than the 5th; the claw is straight, thin, 1/4 to 1/3 the length of the 6th segment, and its anterior margin finely denticulate. Pereopods V and VI are approximately equal in length, pereopods VII somewhat shorter; the 2nd segment is broadened in the distal part, especially so in pair VI; the 2nd segment is broadened in the distal part, especially so in pair VI; the 5th segment is longer than the 4th (in pairs V or VII) or equal to it (in pair VI); the 6th segment is narrower and longer than the 5th; the claws are short and strong; setae, except for small fascicles on the anterior lower angle of the 2nd segment, are absent. The posterior angles of the epimerons are acute and the posterior margin of epimeron III is highly convex. Uropods I are longer than uropods II or III, their inner ramus equal to the peduncle and the outer ramus shorter. The rami of uropods II are somewhat longer than the peduncle. Uropods III have a broad peduncle and petaloid rami. The telson is roundish-triangular, its length equal to width in males and less than width in females. [Dana, 1853].
distribution
A high Antarctic species, found in the coastal regions of the Antarctic (Oates Coast; McMurdo sound in the Ross Sea) and environs of the South Georgia Islands. [Dana, 1853].
look_alikes
Dana, 1853: 988 (Tauria); Bate, 1862: 296; Bovallius, 1889: 81 (Tauria); Spandl, 1927: 156; Shoemaker, 1945b: 291; Bowman, 1973: 13.
size
Length of adult specimens up to 29 mm. [Dana, 1853].
Name
- Homonyms
- Hyperia macrocephala Dana, 1853