Beringius nearensis Mclean & Clark 2023, n. sp.
Beringius nearensis n. sp. Figures 7 A–D urn:lsid:zoobank.org:act: 1AD87361-3122-4D3B-9452-7DC578B193E6 Type locality: Stalemate Bank, W of Attu Island, Near Ids., Aleutian Is., Alaska (54°54.50 N, 170°49.26 E), 219 m (NMFS 23-199701 - 211). Type material. Holotype LACM 3571, 103.4 mm. (leg. RNC, 3...
| Main Authors: | , |
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| Format: | Other/Unknown Material |
| Language: | unknown |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://zenodo.org/record/8399588 https://doi.org/10.5281/zenodo.8399588 |
| Summary: | Beringius nearensis n. sp. Figures 7 A–D urn:lsid:zoobank.org:act: 1AD87361-3122-4D3B-9452-7DC578B193E6 Type locality: Stalemate Bank, W of Attu Island, Near Ids., Aleutian Is., Alaska (54°54.50 N, 170°49.26 E), 219 m (NMFS 23-199701 - 211). Type material. Holotype LACM 3571, 103.4 mm. (leg. RNC, 3 August, 1997, trawled, R/V Dominator) Paratypes: Pt 1, USNM 1606662, 127.19 mm. E of Agattu Island, Near Ids. (52°28.04 N, 174°13.71 E), 118 m (NMFS 94-200201 - 161); Pt 2, SBMNH 169001, 119.7 mm. S of Shemya Island, Semichi Ids. (52°35.22 N, 174°17.79 E), 96 m (NMFS 148-201001 - 183); Pt 3, CASIZ 236197, 87.2 mm. E of Agattu Island, Near Ids. (52°10.89 N, 173°40.63 E), 163 m (NMFS 148-201001 - 188); Pt 4, RNC 4882, E of Agattu Island, Near Ids. (52°30.25 N, 174°13.41 W), 111 m (NMFS 147-200401 - 201). Description: Shell of moderate size (to 127 mm, USNM 1606662), pyriform, white or pale pinkish, periostracum thin, brown, adherent; suture deeply impressed. Protoconch with 2.5 whorls; teleconch of 4–4.5 whorls. Axial sculpture of nine or ten projecting, often opisthocline ribs or folds, interspaces broader than ribs, persisting in final whorl. Spiral sculpture of seven to nine cords low, moderately strong, flat-topped or slightly concave cords topped by two to five fine threads; interspaces broader than cords, bearing similar fine threads. Aperture oval, much less than half of shell height, canal short, rather narrow. Radula (fig. 7 D), rachidian tooth reduced, flat, plate-like, broader than long, lateral edges rounded, excavated anteriorly and posteriorly. Lateral teeth large, tri-cuspid, outer cusp very long, thick, curved, tapering, distally pointed, central and inner cusps much smaller, about ¼ as long as outer one, separated by a deep notch; inner cusp slightly shorter than central one, anteriorly flattened, and slightly curved. Remarks: This species differs from Beringius undatus Dall, 1919 (figs. 7 E–F) by the profuse, spiral micro-striae on the cords and interspaces, the fewer nine to ten opposed to 12–14, less ... |
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