Paraeuchaeta norvegica

Paraeuchaeta norvegica (Boeck, 1872)

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Overview

Description

Body clear, the feeding area dark red. Eggs blue, caudal chaetae and pubescence irradiant.

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Description

Diagnostic Description

Female: The ventral projection on the genital segment is perpendicular to the segment ends in two rounded peaks. The base of the ventral projection carries small folds and bumps on the proximal end of the segment. The back corners of the last thoracic carry a slight bump at the very tip.
Male: Serrated plate on the last segment of the exopodite of the left P5 ends with a claw-like structure which is curved inward.

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Morphology

Female: The base of the frontal organ is set low. The back corners of the last thoracic segments protrude slightly, but are rounded and pubescent on the bottom edge and carry a slight bump at the very tip. The genital segment is symmetrical with a transverse fold, which is best developed in the left proximal side of the segment. The ventral projection is massive, with peaks above and below the opening. The genital field is slightly asymmetrical with double mounts that carry sharp peaks in their caudal ends. A1 almost as long as the cephalothorax. The outer edge of the first segment of the exopodite of P1 is convex and carries a small spine. The outer spine of the first segment of P1 reaches beyond the base of the next spine.
Male: Exopodite of P1 contains 3 segments. The distal segment of the exopodite of the left P5 does not have a sharp edge, but hold a group of chaetae; the last segment carries a serrated plate with sharp serrations set far apart and ends with a claw-like structure, which is curved inward.

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Size

Females: 7.00-11.00 mm
Males: 5.45-7.50 mm

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Ecology and Distribution

Distribution

North Sea, Norwegian Sea, Greenland Sea, the central Arctic Basin. For Kosobokova & al. (2010, in press) Paraeuchaeta norvegica is an expatriate species from Atlantic to the Arctic Ocean Basins, because the reproduction is not assumed in polar waters

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Habitat

Oceanic bathypelagic species. In the Arctic Basin occurs at small depths.

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Trophic Strategy

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.

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Taxonomy

  • Euchaeta norvegica Boeck, 1872 (synonym)
  • Pareuchaeta norvegica (Boeck, 1872) (synonym)

References

Auel, H. (1999).  The Ecology of Arctic Deep-Sea Copepods (Euchaetidae and Aetideidae). Aspects of their Distribution. Ber. Polarforsch. 31, Abstract
C., R., de F. B., J. K., & N. D. (2011).  Diversity and Geographic Distribution of Marine Planktonic Copepods.
Kosobokova, K., Hirche H. J., & Hopcroft R. R. (2007).  Reproductive biology of deep-water calanoid copepods from the Arctic Ocean. Marine Biology. Abstract