Sinezona platyspira, 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: 9-11

publication ID

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

publication LSID

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

DOI

http://doi.org/10.5281/zenodo.6166676

persistent identifier

http://treatment.plazi.org/id/C5AD65EF-D6EA-4ACE-9FD2-3104D34961FF

taxon LSID

lsid:zoobank.org:act:C5AD65EF-D6EA-4ACE-9FD2-3104D34961FF

treatment provided by

Plazi

scientific name

Sinezona platyspira
status

new species

Sinezona platyspira   new species

( Figure 7 View FIGURE 7 )

Type material. Holotype ( NMNZ M. 301400: Fig. 7 View FIGURE 7 A). 0.95 × 0.6 mm. Paratype from type locality ( NMNZ M.301399, 1: Fig. 7 View FIGURE 7 B).

Type locality. West Norfolk Ridge, W of Cape Reinga, New Zealand, 34.298 ˚S, 168.430 ˚E, 785–800 m, 2 June 2003, RV Tangaroa   , comminuted coral and bryozoans.

Etymology. Platy-, flat, -spira, spire: referring to the flat spire of the species. Adjective.

Description. Shell small (to 0.95 mm. Fig. 7 View FIGURE 7 ), trochiform depressed. Protoconch 1 whorl, strong axials, no apertural varix, apertural margin convex. Teleoconch I of 0.9–1.1 whorls, 12–26 axial lamellae, interstices with finest growth marks, no spirals. Teleoconch II of 0.6 whorl, suture deeply impressed. Shoulder flat; approximately 12–21 axial cords, often restricted to adsutural quarter, in some specimens almost absent; no spirals. Base with distinct constriction below selenizone; on teleoconch I, axial lamellae continuous into umbilicus; on teleoconch II, fewer axial lamellae (approximately 6) fading out towards umbilicus; no spirals. Umbilicus open, deep, cavity produced by rounded portion of previous whorls, underside of protoconch visible, bordered by strong spiral cord. Aperture tilted, D-shaped, roof overhanging. Selenizone above periphery, keels strong, quite elevated; lunules distinct, foramen closed with short anterior raphe.

Animal unknown.

Distribution. West Norfolk Ridge, W of Cape Reinga, northern New Zealand, 785– 800 m.

Specimen records. West Norfolk Ridge, W of Cape Reinga, 34.285 ˚S, 168.430 ˚E, 785–800 m ( NMNZ M.172128, 31).

Remarks. Sinezona platyspira   can be distinguished from New Zealand species as follows. Sinezona bandeli   has a strong constriction on the base below the selenizone, has an umbilicus with straight walls, and the protoconch has an apertural varix. Sinezona brevis   has an umbilicus with straight walls, a much shorter selenizone (0.1 vs. 0.4 whorl), and a more elevated spire. Sinezona iota   has a much taller shell with protruding protoconch, the umbilicus has straight walls, and the protoconch has an apertural varix. Sinezona laqueus   has a stronger constriction of the base below the selenizone, the umbilicus has straight walls, and has axial folds as opposed to lamellae. Sinezona levigata   has a callus covering the umbilicus, lacks a constriction of the base below the umbilicus, and has no axial lamellae. Sinezona mechanica   has an umbilicus with straight walls, about twice as many finer axial cords, and has axial cords over the entire width of the shoulder on teleoconch II. Sinezona pacifica   has an umbilicus with straight walls, is overall taller, and has a protoconch with apertural varix. Sinezona pauperata   lacks a selenizone, has a very narrow umbilicus, and lacks axial lamellae.

The subantarctic Sin. subantarctica has a callus covering the umbilicus, a very short selenizone (<0.1 whorl), and spiral threads on the lower base. Satondella minuta Bandel, 1998   from the Indo-Pacific has much more elevated keels bordering the foramen.

NMNZ

Museum of New Zealand Te Papa Tongarewa