Arcticotantulus kristenseni Knudsen, Kirkegaard & Olesen, 2009, sp. nov.

• Published in: The Holocene
• Main Authors: Knudsen, Steen Wilhelm, Kirkegaard, Maja, Olesen, Jørgen
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2009
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Deoterthridae; Arcticotantulus; Arcticotantulus kristenseni; Disko Bay; Greenland
• Online Access: https://doi.org/10.5281/zenodo.5612790; http://treatment.plazi.org/id/03B07F41FFF2FFE1FF153AFEFAC70689

Species. Arcticotantulus kristenseni sp. nov. Material examined. Holotype: ZMUC CRU 4889, tantulus larva attached dorsally to the first abdominal somite of a copepodid IV stage of an unidentified harpacticoid copepod ( Bradya sp.) mounted on a stub for SEM; collected at Iqpik fishing ground, Disko Bay, Greenland (69°17.2'N, 53°14.4'W), depth 198 m, by R. M. Kristensen, 16 August 2001. Paratypes: (n = 4) ZMUC CRU 4890, mounted on a stub for SEM, same locality information as for holotype. ZMUC CRU 4891 (n = 18) mounted on a stub for SEM; collected at Iqpik fishing field, Disko Bay, Greenland (69°18.0'N, 53°11.5'W), depth 166–170 m, by S. W. Knudsen, M. Kirkegaard, and R. M. Kristensen, 12 July 2002. ZMUC CRU 4872–4888 (n =15) as whole mounts in 100% glycogen solution for light microscopy; collected at Iqpik fishing ground, Disko Bay, Greenland (69°18.0'N, 53°11.5'W), depth 166–170 m, by S. W. Knudsen, M. Kirkegaard, and R. M. Kristensen, 12 July 2002. Diagnosis. Tantulus larva comprising cephalon, thorax of six pedigerous somites and one limbless somite, and an undivided abdomen. First thoracic tergite largely concealed beneath posterior margin of dorsal cephalic shield. Cephalic shield triangular; ornamentation consisting of two anterior and four posterior pairs of pores, three pairs of which have an emergent sensillum; surface lamellae present. Cephalic stylet slightly curved in lateral aspect. Thoracopods 1 to 5 each with unsegmented protopod bearing a well developed medial endite. Exopod of thoracopods 1 to 5 two-segmented with 3 (leg 1) or 4 setae (legs 2–5). Of these, the two on the outer margin share a common base, and the one (or two) on the inward side has a second base – if two setae are present on the inward side, they also share a common base. Endopod indistinctly subdivided (terminal part as rigid spine bearing a spatulate process) with 1 seta (legs 1 and 2) or 2 setae (legs 3–5). The endopod setae originate medially from the first segment of the endopod. Thoracopod 6 with unsegmented protopod and one ...