Euchonicola caudatus Boxshall & O'Reilly & Sikorski & Summerfield 2019, gen. et sp. nov.

• Main Authors: Boxshall, Geoff A., O'Reilly, Myles, Sikorski, Andrey, Summerfield, Rebecca
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Cyclopoida; Saccopsidae; Euchonicola; Euchonicola caudatus; Snøhvit
• Online Access: https://doi.org/10.5281/zenodo.5927074; http://treatment.plazi.org/id/97720E2DFFD8D629CBF7BEC2064FF167

Euchonicola caudatus gen. et sp. nov. Type material : ♀ Holotype from Euchone sp., Regionale 2004, Stn 06-3 (60.5222°N, 03.727°E), depth 295 m, 0 1 June 2004; collected by A. Sikorski; NHMUK Reg. No. 2015.445. ♀ paratype from Euchone sp., Fish 2010, Stn 5- 4 (71.78508°N, 21.16853°E), depth 315 m, 23 May 2010; collected by A. Sikorski; NHMUK Reg. No. 2015.3011. ♀ paratype from Euchone sp., Snøhvit, Stn SF 9-2 (71.61494°N, 21.04817°E), depth 323 m, 0 9 June 2003; collected by A. Sikorski; NHMUK Reg. No. 2016.588. ♀ paratype detached from host, Euchone sp., northern North Sea, NW Hutton Field, BP x 0 54, 5000N (61.14501°N, 01.30915°E), depth 146 m, summer 2002; collected by P.R.Garwood; NHMUK Reg. No. 2015.3012. Differential diagnosis . Adult female attached to host via short oral stalk connecting ectosoma with discoid, embedded endosoma (Fig. 22 A–C). Total length of cylindrical ectosoma 406 to 443 µm, with trunk about 2.4 to 2.5 times longer than wide (365–410 µm by 160–165 µm, respectively); retaining apparent traces of subdivision along body (Fig. 22A) in some specimens, and with distinct abdomen. Stalk located anteriorly on ectosoma (Fig. 22E), with paired lobate antennules and subchelate antennae positioned close to base of stalk. Antennules (Fig. 22F) lobate, unarmed. Antennae (Fig. 22G) comprising broad basal segment with lobate inner margin, and strongly recurved, claw-like apical subchela: tip of subchela opposing rounded swelling on myxal margin of basal segment when adducted. Ectosoma bearing paired, unarmed, rounded genital lappets posteriorly, marking genital openings. Paired cement glands visible posteriorly in trunk, extending at least half length of trunk. Abdomen distinct, unsegmented, about 2.2 times longer than wide; bearing laterally-directed caudal rami, and with median anal slit (Fig. 22D). Caudal rami divergent; each ramus bipartite with broad proximal part and narrow distal part bearing vestige of single caudal seta apically (Fig. 22D). Egg sacs unknown. Etymology . The name of the new ...