dcsimg

Diagnostic Description

provided by iArczoo

Females: Genital segment has a bump on the distal end on the left side. Two last abdominal segments densely plumose.
Males: Serrated plate on the last segment of the exopodite of the left P5 lacks serrations on the outer edge.

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Distribution

provided by iArczoo

North Atlantic, Farer Canal, Azure and Canary Islands, Gibraltar, Gulf of Gascon, the central Arctic Basin, North Pacific, Kuril Islands

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Habitat

provided by iArczoo

Oceanic, bathypelagic species; in the Arctic Ocean found at depths 0-1400m.

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Morphology

provided by iArczoo

Females: Rostrum straight, relatively narrow and long, the back end of the thorax rounded and with dense pubescence. The genital segment has a protuberance only on the left side in the distal half of the segment at the base of the ventral crest. The genital field has oval shaped mounds, separated more toward the front. The genital segment is equal in length to the next two segment combined, the last segment and caudal rami densely plumose. The bare chaetae on the appendages are longer than the others. A1 as long as the cephalothorax. The outer spine on the second segment of the exopodite of P2 reaches above the next one, the middle spine is equal in length to half of the distance between its base and the base of the next spine.
Males:
The left P5 contains a plate serrated on the longer side, which narrows toward the distal end. Serrations are unequal in length. The penultimate segment has an elongated inner protuberance.

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Reproduction

provided by iArczoo

Egg-brooding species. Carry resistant sacs with a strong, highly visible membrane, which contain 10-20 large orange to bright red eggs. Eggs contain enough food stores for all the naupliar stages, and possibly the first 2 copepodite stages (which are presumed not to feed)

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Size

provided by iArczoo

Females: 6.00-12.00 mm
Males: 6.10-10.00 mm

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Trophic Strategy

provided by iArczoo

Active predators, feed on smaller copepods. Implements a sit-and-wait strategy, staying motionless in the water column, until prey comes into reach, then rapidly jumps towards the prey by movements of the thoracopods and the first antennae and catches the victim with the enlarged maxillipeds.

license
cc-by-3.0
compiler
Ershova, Elizaveta
partner site
iArczoo

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Euchaeta barbata Brady, 1883

This species was originally described from the southwestern Atlantic and has been known to occur widely over the tropical, subtropical, and temperate zones of the World Ocean. With (1915) distinguished a large form of E. barbata in the Norwegian Sea as a separate species, E. farrani, which was subsequently also found in the Antarctic seas by Farran (1929) and Vervoort (1957). This bipolar species shows no morphological differences from E. barbata except for the body size and appears to be only a geographical race rather than a separate species.

In the present study, E. barbata was found rather consistently, although in small numbers, in tows down to depths of 1000 to 3000 m. Altogether 82 females and 23 males have been identified from the Gulf of Mexico and western Caribbean Sea. The body length varied between 7.58 and 8.42 mm in the female and between 6.58 and 7.25 mm in the male. The prosome length of the female and male was 5.42-6.08 mm and 4.45-5.25 mm, respectively.
license
cc-by-nc-sa-3.0
bibliographic citation
Park, Taisoo. 1975. "Calanoid copepods of the family Euchaetidae from the Gulf of Mexico and western Caribbean Sea." Smithsonian Contributions to Zoology. 1-26. https://doi.org/10.5479/si.00810282.196