Mesopsyllus glacialis Novikov & Sharafutdinova 2021, sp. nov.

• Published in: Études finno-ougriennes
• Main Authors: Novikov, Aleksandr, Sharafutdinova, Dayana
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Harpacticoida; Cletodidae; Mesopsyllus; Mesopsyllus glacialis; Arctic; Laptev Sea; laptev
• Online Access: https://zenodo.org/record/4667597; https://doi.org/10.5281/zenodo.4667597

Mesopsyllus glacialis sp. nov. http://zoobank.org/ E7DCBD1A-6E2E-43A0-961E-4DB9A0339052 Etymology. The species is named so because it lives in the Arctic, and its juveniles are painted bluish. The specific epithet is adjective. Type locality. Laptev sea (75.75833°N, 124.04500°E) in sample with sponges Polymastia grimaldii (Topsent, 1913); Tetilla sibirica (Fristedt, 1887). Depth 45 m. Material examined. Holotype: female, dissected and mounted on 2 slides (BP 543/1-a; 543/1-b). Allotype, male dissected and mounted on one slide (543/2). Paratypes: two females dissected and mounted on two slides (543/3, 543/4), 5 females, 5 males and 17 copepodites undissected formalin-preserved (543/5). Description. Female. Body length of holotype: 0.439 mm. Fixed males and females colourless, but copepodites with bluish color. Naupliar eye not discernible. Cephalothorax (Figs. 10A,B) consisting of cephalosome with fused first pedigerous somite, wider as remaining somites, largest width 0.114 mm. Rostrum as in male (Fig. 10C), fused with cephalothorax, with pointed tip; with one pair of sensilla and one pore. Posterior margin of cephalothorax and all somites smooth. Cephalothorax with 19 pairs of sensilla and 5 pairs of pores. All pedigerous and abdominal somites, except anal somite, with rows of small spinules. Second pedigerous somite with 5 pairs of sensilla and one pair of pore. Third pedigerous somite with 6 pairs of sensilla and one pair of pores. Fourth pedigerous somite with 4 pairs of sensilla and one pair of pores. Fifth pedigerous somite with 4 pairs of sensilla, one pair of pores and dorsolateral rows of large spinules. Abdomen (Figs. 11 A-C) almost cylindrical, consisting of genital-double somite, two free abdominal somites and anal somite with caudal rami. Genital-double somite with clear border between segments; with rows of spinules ventrally, medially and on posterior margin; with 7 pairs of pores, two dorsal unpaired pores and two ventral pairs of pores. P6 right and left close; with two slender setae. Genital ...