Pertsovius Andronov & Kosobokova, 2011, gen. nov.

• Main Authors: Andronov, Vladimir N., Kosobokova, Ksenia N.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Calanoida; Discoidae; Pertsovius; Seta; Arctic; Copepods
• Online Access: https://zenodo.org/record/6182132; https://doi.org/10.5281/zenodo.6182132

Genus Pertsovius gen. nov. Diagnosis. Small calanoid copepods with body length seldom exceeding 1 mm. Prosome of females of oval shape, anterior head rounded. Cephalon fully or partly separated from first pediger, fourth and fifth pedigers completely fused. Urosome consisting of four free somites. Genital double somite usually expanded laterally and protruding ventrally, frequently forming very large fold. Caudal rami usually of unequal lengths, longer on left; each bearing four setae, with outer setae shorter and thinner than others; outer seta on left ramus usually longer and thicker than corresponding seta on right one. Rostrum large, obtusely rounded, directed ventrally, without filaments. Antennule consisting of 24–25 free segments, with ancestral segments I–III fused, segments IX–XI separate, distal ancestral segments XXVI and XXVII + XXVIII often fused, but in Disco fiordicus Fosshagen, 1967 and D. oceanicus Gordejeva, 1974 segments XXVI and XXVII + XXVIII separate. Antenna, mandible, maxillule and maxilliped of same structure in all species of genus. Antenna exopod longer than endopod. Mouthparts relatively well developed compared to other discoid genera. Mandible endopod and exopod similar in length; cutting edge of gnathobase bearing five to seven large unicuspidate teeth. Maxillule bearing six setae on first inner lobe, two setae on second inner lobe, one seta on basis, eight setae on endopod, two setae on exopod, and four setae on outer lobe. Maxilla first lobe with four setae, second to fourth lobes two setae each, fifth lobe with one seta, and endopod with four setae. Maxilliped with well-developed syncoxa and basis, bearing five-six setae on syncoxa and two setae on basis; endopod with five free segments with setal formula 1.2. 2.2. 3. P 1 -P 4 coxae and basis have no setae, endopods typically one-segmented and exopods three-segmented, with exception of D. longus Grice & Hulsemann, 1965, where Р 4 endopod two-segmented. Endopods of Р 1 -P 4 bearing three, four, five and five setae, ...