Home|Search|Identify|Taxonomic tree|Quiz|About this site|Feedback
Developed by ETI BioInformatics
Characteristics, distribution and ecology
Taxonomische classification
Synonyms and common names
Literature references
Images, audio and video
Distribution map
Links to other Web sites

(Krøyer, 1844)

Description:
Head and body smooth, without tubercles or spines; body stout, in female more slender than in male. Maximum length 7 mm in male and 6 mm in female.
Antenna 1 about one-third to one-half of the length of the body, flagellum of eight articles. Antenna 2 with short ventral setae; about as long as the peduncle of antenna 1. Mandible without a palp.
Gnathopod 1 with a short obtuse spine on the distal merus, plus one or two distal setae; carpus triangular. Gnathopod 2 inserted near the middle of the segment; palm of the propodus armed with a strong proximal poison spine and a large sub-median tooth; dactyl slightly sinuous on the inner border. Gnathopod 2 of female without a sub-median tooth.
Gills small, oval, on segments 3 and 4 only.
Pereiopods 3 and 4 represented by single seta only. Pereiopods 5 minute, comprising two segments with a long terminal seta. Pereiopods 6 and 7 with six articles.
Abdomen in male with plaque and a pair of vestigial lobes, female without lobes.
Anterior pair of incubatory lamellae setose.
The species in the North Sea belong to the variety inermis:
antenna 1 without a tubercle; gnathopod 2 with a deep indentation on the palm; propodus of perepods 6 and 7 without spines. On the southern and eastern coasts of Britain variety armatus occurs: with a tubercle on the peduncle of article 3 of antenna 1; without a deep indentation on the palm of gnathopod 2; with a strong proximal spine on the propodus of pereiopods 6 and 7.

Habitat:
Variety inermis is found in the sublittoral, but may occur on the lower shore; on coarse sandy substrata, but often on the aboral surface of the starfish Asterias rubens and Crossaster papposus.

Distribution:
Widely distributed in the North Sea.

Pariambus typicus