Re-descriptions of Caprella linearis (Linnaeus, 1767) and C. septentrionalis Kröyer, 1838 (Crustacea: Amphipoda: Caprellidea) from Scotland, with an ontogenetic comparison between the species and a study of the clinging behaviour
Caprella linearis (Linnaeus, 1767) and C. septentrionalis Kröyer, 1838 are re-described based on specimens collected from the coasts of Scotland. Mature males of C. linearis differ clearly from those of C. septentrionalis mainly in the features of antenna 1 and gnathopod 2. The pair of lateral projections present on pereonite 5 in females of C. linearis is lacking in females of C. septentrionalis. The gnathopod 2 propodus is wider and the genital openings more setose in females of C. septentrionalis than in C. linearis. The arrangement of the body projections and the abdomen during development is quite similar in C. linearis and C. septentrionalis. For both species the predominant mode of attachment to the substrate is the upright posture and feeding is by filtering, frequently using grooming behaviour. These species present basically the same geographical distribution, along the North Atlantic, Boreal and Arctic regions and they are not very specific in choosing their substrate.
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Document Type: Research Article
Publication date: 04 October 2002