Bathycrinus rozhnovi Mironov 2019, n. sp.

• Main Author: Mironov, Alexandr N.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2019
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Crinoidea; Bourgueticrinida; Bathycrinidae; Bathycrinus; Bathycrinus rozhnovi; Kamchatka
• Online Access: https://zenodo.org/record/5587063; https://doi.org/10.5281/zenodo.5587063

Bathycrinus rozhnovi n. sp. Figs 7 A–J, 8A–I, 9A–H Synonymy: Bathycrinus sp. D — Belyaev 1966: 119. Etymology: The species is named for Sergey V. Rozhnov, Borissiak Paleontological Institute, Russian Academy of Sciences, Moscow, in recognition of his contributions to our knowledge on echinoderm evolution. Holotype. IO RAS, No. XV-63-8, RV Vityaz, St. 7499, aboral cup with arms and proximal stalk, RRD = 3.84 mm. Type locality. RV Vityaz, cruise 59, St. 7499, 21.06.1976, the Japan Trench, 37°85′5 N, 144°12′1E, 6480–6640 m. Material examined. RV Vityaz, cruise 59, St. 7499, TS, 21.06.1976, Japan Trench, 37°85′5 N, 144°12′1 E, 6480–6640 m, holotype and 17 paratypes, IO RAS Cat.no. Ech 00762– Ech 00764; RV Vityaz, cruise 19, St. 3114, TS, 27.08.1954, east of Kuril-Kamchatka Trench, 48°43.2′ N, 160°55.9′ E, 5670–5680 m, 1 sp. + fr-ts, IO RAS Cat. no. Ech 00759; RV Vityaz, cruise 19, St. 3214, TS, 24.10.1954, Japan Trench, TS, 38°10.9′ N, 143°56.2′ E, 6156–6207 m, 8 spms., IO RAS Cat. no. Ech 00760; RV Vityaz, cruise 45, St. 6138, TS, 11.06.1969, south-east of Aleutian Trench, 53°11,0′ N, 163°12,0′ W, 5595–5660 m, 1 sp., paratype, IO RAS Cat. no. Ech 00761. RV Sonne, KuramBio II, St. 86, AGT, 15.09.2016, east of Kuril-Kamchatka Trench, 45°00.43′ N, 151°06.01′ E – 45°01.37′ N, 151°06.00′ E, 5493 m, paratype 18, SMF. Total: 15 aboral cups with proximal arms and stalks; 6 aboral cups with proximal arms; 7 RR-rings with proximal arms; arm and stalk fragments; RRD from 1.41 to 4.47 mm. Description of the holotype (Figs 7A, C, D). CH 2.37 mm, RRD 3.84 mm, BBd 1.44 mm; CH /RRD 0.62. RRring is slightly funnel-shaped, forming with BB evenly sloping line (Fig. 7A); RRH/RRD 0.42; BBH/RRH 0.49. Distinct sutures between BB; BBH/BBD 0.44. Surface of BB and RR smooth. Tegmen rising to base of Br3. Sides of tegmen without plates. Height of primibrachitaxis (IBr1+2ax) 3.48 mm. Ratio IBr1H/RRH 1.06, Br1H/Br2H 0.94, Br1H/W 0.72, Br2H/W 0.70. First and second primibrachs very short, with smooth surface and low longitudinal median ...