Bathycrinus volubilis Mironov 2000
- Dataset
- See lilies of the genus Bathycrinus (Echinodermata, Crinoidea: Bathycrinidae) from the North-West Pacific hadal trenches
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Echinodermata
- class
- Crinoidea
- order
- Bourgueticrinida
- family
- Bathycrinidae
- genus
- Bathycrinus
- species
- Bathycrinus volubilis
description
Figs 1 A – G Synonymy: Bathycrinus sp. B. — Belyaev 1966: 118, 119, fig. 31; Bathycrinus volubilis – Mironov 2000: 714 – 719, figs 2 – 4. Non: Bathycrinus? volubilis — Mironov 2000: 718, St. 3514 (= Bathycrinus sp. cf. B. longipinnus n. sp., see below).
discussion
Remarks. Original detailed description of Bathycrinus volubilis was based on abundant material (Mironov 2000). Here I give some additional information on intra-species variability. Both BB-ring and RR-ring always strongly pentalobate (quinquelobate) in cross section (Fig. 1 A – B). Numerous small plates of different shape on sides of upper tegmen (Fig. 1 C). Proximal arm pattern and position of P 1 were examined on 216 arms (Table 1); 49 different proximal patterns were found. Among them, 32 different cases were observed once only. Most frequent proximal patterns are 1 + 2 4 + 5 7 + 8 10 + 11 13 (41 %) and 1 + 2 4 + 5 7 + 8 10 + 11 12 (20 %). P 1 on Brs 11 – 15; the most frequent positions on Br 12 (31 %) and Br 11 (24 %). Cover plates shape changes from proximal to distal arm. The cover plates on the proximal Brs are usually thick (not flattened) and with rough surface (Fig. 1 D). On the Brs 4 – 12 they display two series of rough protuberances. The cover plates on distal Brs and pinnules are thin with a smooth surface (Fig. 1 F). The number of short columnals forming the proxistele varies from 17 to 69, but in specimens from St. 2217 it varies from 5 to 24; This number does not exceed 31 in the other Bathycrinus species. Knobby processes on IBrs 1 – 2 are always absent.
distribution
Distribution. Kuril-Kamchatka Trench, 8175 – 9584 m. A specimen from the Izu-Bonin Trench (RV Vityaz, St. 3514) identified as Bathycrinus? volubilis (Mironov 2000) is referred herein to Bathycrinus sp. cf. B. longipinnus n. sp.
materials_examined
Holotype. IO RAS No. XV- 63 - 1, RV Vityaz, St. 5612, 26.07.1966, aboral cup with arms and stalk, RRD = 2.6 mm. Type locality. RV Vityaz, cruise 39, St. 5612, 26.07.1966, TS, Kuril-Kamchatka Trench, 45 º 25 ′ N, 153 º 07 ′ E, 8185 – 8400 m. Material examined. RV Sonne 250, KuramBio II, St. 52, EBS, 0 6.09.2016, 45 ° 29.77 ′ N, 153 ° 12.16 ′ E – 45 ° 29.18 ′ N, 153 ° 11.13 ′ E, 8737 m, 1 specimen, SMF; RV Sonne 250, KuramBio II, St. 77, EBS, 13.09.2016, 45 ° 13.71 ′ N 152 ° 51.21 ′ E E – 45 ° 14.21 ′ N 152 ° 49.95 ′ E, 9584 m, 2 spms, SMF; RV Sonne 250, Expedition KuramBio II, St. 78, AGT, 13.09.2016, 45 ° 13.979 ′ N, 152 ° 48.980 ′ E – 45 ° 14.482 ′ N, 152 ° 47.736 ′ E, 9581.7 – 9581.3 m, 50 spms, SMF; RV Sonne 250, KuramBio II, St. 103, AGT, 21.09.2016, 44 ° 12.499 ′ N, 150 ° 39.035 ′ E – 44 ° 12.502 ′ N, 150 ° 37.258 ′ E, 9292.9 – 9430.8 m, fragments of the stalks, SMF. RV Vityaz, cruise 14, St. 2217, 29. VI. 1953, TS, 44 ° 08 ′ N, 150 ° 32 ′ E, 9000 – 9050 m, 90 spms, IO RAS Cat. no. Ech 00717 – Ech 00720; RV Vityaz, cruise 19, St. 3176, 0 6.10.1954, TS, 44 ° 08.5 ′ N, 150 ° 22.0 ′ E, 8175 – 8840 m, 35 spms, IO RAS Cat. no Ech 00721 – 723; RV Vityaz, cruise 22, RV Vityaz, cruise 39, St. 5612, TS, 26.07.1966, 45 ° 25 ′ N, 153 ° 07 ′ E, 8185 – 8400 m, 254 spms, IO RAS Cat. no. Ech 00724 – Ech 00731; RV Vityaz, cruise 39, St. 5631, TG, 0 4.09.1966, 43 ° 47 ′ N, 149 ° 43 ′ E, 9070 – 9345 m, 4 spms, IO RAS Cat. no. Ech 00732; RV Vityaz, cruise 39, St. 5632, TG, 0 5.09.1966, 43 ° 44 ′ N, 149 ° 52 ′ E, 8240 – 8345 m, 1 sp., IO RAS Cat. no. Ech 00733. Total: 438 specimens from the Kuril-Kamchatka Trench; most of them represented by aboral cup with proximal arms and proxistele, upper diameter of RR-rings (RRD) from 1.4 to 3.7 mm.
Name
- Homonyms
- Bathycrinus volubilis Mironov 2000