Volutopsius nanus, Mclean & Clark, 2023

Mclean, James H. & Clark, Roger N., 2023, Seven new genera and thirty-four new species of buccinoid gastropods (Neogastropoda: Buccinidae) from the Aleutian Islands, Alaska, Zootaxa 5351 (2), pp. 151-201 : 188

publication ID

https://doi.org/ 10.11646/zootaxa.5351.2.1

publication LSID

lsid:zoobank.org:pub:F34F6B3C-F251-4D8E-B002-A96BD70CA1BE

DOI

https://doi.org/10.5281/zenodo.8399638

persistent identifier

https://treatment.plazi.org/id/B6C52DEE-CFE6-4858-9013-AE5100D4E120

taxon LSID

lsid:zoobank.org:act:B6C52DEE-CFE6-4858-9013-AE5100D4E120

treatment provided by

Plazi

scientific name

Volutopsius nanus
status

sp. nov.

Volutopsius nanus View in CoL n. sp.

Figures 19 A–C View FIGURE 19 urn:lsid:zoobank.org:act:B6C52DEE-CFE6-4858-9013-AE5100D4E120

Type locality: SW of Buldir Island, Aleutian Is. , Alaska (52°18.5 N, 175°49.0 E), 325 m ( NMFS 23-199701 - 243 ) GoogleMaps .

Type: Holotype, LACM 3588 About LACM , 35.6 mm (leg. RNC 9 Aug. 1997) ; Paratypes: Pt 1–3, LACM 3669 About LACM , 20.8–29.5 mm. SW of Agattu Island, Near Ids. (52°13.5 N, 173°27.8 E), 169 m ( NMFS 23-199701 - 229 ); Pt 4, SBMNH 169015 About SBMNH GoogleMaps , 33.4 mm. SE of Buldir Island (51°24.6 N, 175°20.0 E), 187 m ( NMFS 94-200201 - 158 ); Pt 6, USNM 1606664 About USNM GoogleMaps , 35.1 mm. SE of Buldir Island (51°24.6 N, 175°20.0 E), 187 m ( NMFS 94-200201 - 158 ); Pt 7, RNC 4711 GoogleMaps , 40.0 mm. (Type locality).

Referred material: RNC 4888 , 1 sp., 36.8 mm. SW of Agattu Island , Near Ids. (52°13.5 N, 173°27.8 E), 169 m ( NMFS 23-199701 - 229 ) GoogleMaps ; RNC 4901 , 15.34 mm. ESE of Buldir Island (52°20.61 N, 176°22.79 E), 227 m (23- 2000-01-173) GoogleMaps .

Description: Small for genus, height to 40.0 mm; suture moderately impressed, whorls rounded. Protoconch, one whorl, 3.7–4.1 mm in diameter, with four spiral cords; teleconch with three whorls; spiral sculpture of very fine lirae, with slightly wider interspaces, about 30 on penultimate whorl, and continuing on below the suture. Aperture a little more than half of shell height, outer lip flared; canal short, broad. Operculum small, less than half of aperture height.

Radula: Typical for subfamily, rachidian tooth with four subequal cusps; lateral teeth with two large, heavy cusps, outer cusp strongly curved, inner cusp straight.

Remarks: This is the smallest known species of Volutopsius , and probably cannot be confused with any congeners. Volutopsius middendorffi (Dall, 1891) is similar but much larger, reaching over 11 cm, and has a pinkish protoconch.

Etymology: Named for its small size, from the Latin nanus, dwarf. Volutopsius nanus is considerably smaller than all other known Volutopsinae.

Distribution: This small species is restricted to the western-most Aleutians, from the vicinity of Buldir Id. (176°22 E) to Attu Id. (173° E), at depths of 169– 325 m.

Habitat: Lives on black sand and gravel, at temperatures of 3.6°–4.1° C.

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