Anatoma tangaroa, Geiger, Daniel L. & Marshall, Bruce A., 2012

Geiger, Daniel L. & Marshall, Bruce A., 2012, New species of Scissurellidae, Anatomidae, and Larocheidae (Mollusca: Gastropoda: Vetigastropoda) from New Zealand and beyond, Zootaxa 3344, pp. 1-33 : 27-28

publication ID

https://doi.org/ 10.5281/zenodo.281437

publication LSID

lsid:zoobank.org:pub:293824D9-E73D-4D75-8058-1786E951DB23

DOI

https://doi.org/10.5281/zenodo.6166694

persistent identifier

https://treatment.plazi.org/id/95101763-32A0-4A80-AFFD-6F1497786141

taxon LSID

lsid:zoobank.org:act:95101763-32A0-4A80-AFFD-6F1497786141

treatment provided by

Plazi

scientific name

Anatoma tangaroa
status

new species

Anatoma tangaroa new species

( Figures 21–22 View FIGURE 21 View FIGURE 22 )

Chresonymy. Anatoma sp. 6 Spencer et al. 2009: 201.

Type material. Holotype ( NMNZ M. 303297 Fig. 21 View FIGURE 21 ). 1.79 × 1.42 mm. Paratypes from type locality ( NMNZ M. 150335, 10: Fig. 22 View FIGURE 22 A). Additional paratypes: Middlesex Bank, NW of Three King Islands, New Zealand, 34.033 ˚S, 171.733 ˚E, 246–291 m ( NMNZ M.148568, 25: Fig. 22 View FIGURE 22 C); 28 km S of Great Island, Three King Islands, 34.400 ˚S, 174.280 ˚E, 120 m ( NMNZ M. 160285, 15: Fig. 22 View FIGURE 22 B).

Type locality. NW of Three Kings Islands, northern New Zealand, 34.033 °S, 171.806 °E, 188 m, 27 June 1978, RV Tangaroa , comminuted bryozoans and shell.

Etymology. After RV Tangaroa , from which the type material was dredged. Noun in apposition.

Description. Shell medium size (to 2.2 mm: Figs 21–22 View FIGURE 21 View FIGURE 22 ), trochiform rounded biconical. Protoconch of 0.75 whorl, coarse flocculent sculpture, no apertural varix. Teleoconch I of 0.3 whorl, 5–7 axial cords, spiral in position of selenizone forming thickenings at intersection with axial cords. Teleoconch II of 2.2 whorls, suture moderately impressed; sutsel at onset of selenizone 0.5 × width of selenizone, at apertural margin 1–1.5 × width of selenizone. Shoulder moderately convex, strong axial cords, approximately 40 on first whorl; first spiral line after 0.2–0.5 teleoconch II whorl, approximately 10–15 at apertural margin, forming small thickenings at intersection with axial cords. Base without constriction below selenizone, same density and strength of axial cords as on shoulder; approximately 20 spiral threads, regularly spaced. Umbilicus open, continuously sloping with base, no funiculus. Aperture rounded, roof overhanging. Selenizone at periphery, rather wide; keels of moderate strength, moderately elevated; lunules distinct; slit open, margins converging towards aperture. Animal unknown.

Distribution. Northern New Zealand, 120– 291 m.

Specimen records. New Zealand. S of Great Island, Three King Islands, 34.235 ˚S, 172.150 ˚E, 192–202 m ( NMNZ M. 160289, 10).

Remarks. Anatoma amydra from the Indo-Malayan Archipelago has weaker spiral threads on the base, has a protoconch with an apertural varix, and has a longer teleoconch I (> 0.5 vs. 0.3 whorl). Anatoma flexidentata from the Indian Ocean to the Western Pacific has a wider selenizone, a narrower sutsel on early whorls (<0.25 × vs. 0.5 × width of selenizone), and has weaker axial cords. Anatoma pseudoequatoria from the Indo-Malayan Archipelago and Central Pacific has a more subquadrate whorl profile, has no spiral cord in position of the selenizone on teleoconch I, and has a distinct funiculus. Anatoma japonica from the Indo-Pacific has a longer teleoconch (> 0.5 vs. 0.3 whorl), has a protoconch with an apertural varix, and the protoconch does not project at the apex. Anatoma maxima from the Indo-Malayan Archipelago to the Western Pacific has a longer teleoconch I (0.75 vs. 0.3 whorl), and has no sutsel on early whorls. Anatoma rainesi from the Eastern and Western Pacific has a protoconch with a varix, and has a longer teleoconch I (0.6 vs. 0.3 whorl). Anatoma rapaensis from the Indo-Central Pacific has no sutsel, has a more impressed suture, and has spiral steps on shoulder and base.

NMNZ

Museum of New Zealand Te Papa Tongarewa

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Lepetellida

Family

Anatomidae

Genus

Anatoma