Gaetanus brevispinus

Gaetanus brevispinus (G. O. Sars, 1900)

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Overview

Description

Front part of the body has a bright red color

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Description

Morphology

Females:
Body plump and does not narrow towards the bottom, top of the head flattened. Rostrum widens at the base has a deep crevice on the top. Head fused with the thorax, 2 last segments separate. Spines on the last thoracic segment short, thin and face straight backward. A1 reach the back edge of the second abdominal segment, the endopodite of A2 is shorter than the outer branch by 0.25 of its length. Exopodite of P1 three-segmented, endopodite of P2 two-segmented. Mxp2 has a lateral plate. The basipodite of P4 carries 20-24 narrow, long spines. Abdomen 3.5 times shorter than the cephalothorax. The genital segment is equal in length to the next 3 segments combined, the back side of all abdominal segments carry small serrations.

Males:
Smaller and more slender than the female. A1 reach the first third of the second abdominal segment. Rostrum does not widen as much at the base. The spines on the last thoracic segment have the same structure as in females, but they are not separated from the segment. The left endopodite of P5 relatively short, it is equal in length to 2/3 of the first segment of the exopodite of the same branch.

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Size

Females: 3.60-4.90 mm
Males: 2.08-4.00 mm

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Ecology and Distribution

Distribution

Central Arctic Basin, North Atlantic, Sea of Japan, Se of Okhotsk, Bering Sea, North-Western Pacific

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Habitat

Oceanic, bathypelagic species. In the Pacific occurs at depths less than 200m, in the Arctic can be found at the surface

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Reproduction

Broadcast spawners (release eggs freely into the water), usually 2-6 eggs per spawning event. Eggs possess 2 membranes with a perivitelline space between them.

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Trophic Strategy

Opprotunistic omnivores; studies suggest that diet is primarily carnivorous

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Taxonomy

  • Gaidius brevispinus (G. O. Sars, 1900) (synonym)

References

Kosobokova, K., Hirche H. J., & Hopcroft R. R. (2007).  Reproductive biology of deep-water calanoid copepods from the Arctic Ocean. Marine Biology. Abstract