Botryllophilus coniorhynchus Kim & Boxshall 2021, sp. nov.

• Main Authors: Kim, Il-Hoi, Boxshall, Geoff A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Maxillopoda; Cyclopoida; Ascidicolidae; Botryllophilus; Botryllophilus coniorhynchus; Antarctic; Terre Adélie; Terre-Adélie; Seta; Antarc*
• Online Access: https://zenodo.org/record/4822494; https://doi.org/10.5281/zenodo.4822494

Botryllophilus coniorhynchus sp. nov. (Figs. 60-62) Type material. Holotype ♀ (MNHN-IU-2018-1973), 3 ♀♀ paratypes (intact, MNHN-IU-2018-1974), and 2 ♀♀ paratypes (dissected, MNHN-IU-2014-17376) from Aplẚdẚum falklandẚcum Millar, 1960 (MNHN-IT-2008-386 = MNHN A1 / APL.B/532); Antarctic, Terre Adélie, CEAMARC cruise, RV “Aurore Australis”, Stn 18EV479 (66º10’S, 139º41’E), depth 402-437 m, IPEV-AAD-MNHN coll., 15 January 2008. Etymology. The name of the new species is derived from the Greek cçnẚ (= a cone) and rhynch (= a snout), and refers to the conical rostrum. Description of female. Body (Fig. 60A, B) asymmetrical, 1.15 mm long. Anterior part of body comprising cephalosome to fifth pedigerous somite, 0.73 mm long, invariably slightly curved to right side, unsegmented but with 4 weak constrictions dorsally and laterally; lateral margins parallel. Body width 0.33 mm across middle of anterior part. Posterior part of body (Fig. 60C) consisting of genital and 4 abdominal somites. Genital apertures positioned dorsally on genital somite. Caudal ramus (Fig. 60D) armed with 4 claws and 1 seta; 1 outer distal claw bluntly tipped, other claw not articulated with ramus. Rostrum (Fig. 61A) distinct, conical, longer than wide (57×42 μm). Antennule (Fig. 60E) short, about 115 μm long, strongly tapering, with markedly broadened first and second segments; terminal segment subdivided on posterior side; armature formula 9 (3 large and 6 small), 5 (2 large and 3 small), 2 (1 large and 1 small), and 12. Left antenna (Fig. 60F) apparently 5-segmented, consisting of coxa, basis, and 3-segmented endopod; proximal 3 segments unarmed; second endopodal segment (fourth segment) 46×18 μm, with 2 bluntly tipped setae on inner margin; third endopodal segment 17×16 μm, with 4 (2 shorter inner and 2 longer outer) bluntly tipped setae on distal margin. Right antenna similar in size and segmentation to left antenna; 2 setae on second endopodal segment and 2 inner distal setae on third endopodal segment slightly longer than those of left antenna ...