Scissurella regalis, 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: 2-4

publication ID

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

publication LSID

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

persistent identifier

http://treatment.plazi.org/id/8F94E7A0-1438-4BF7-9BB9-F5555A966ADF

taxon LSID

lsid:zoobank.org:act:8F94E7A0-1438-4BF7-9BB9-F5555A966ADF

treatment provided by

Plazi

scientific name

Scissurella regalis
status

new species

Scissurella regalis   new species

( Figure 1 View FIGURE 1 )

Type material. Holotype ( NMNZ M. 173745: Fig. 1 View FIGURE 1 A). Paratypes from type locality ( NMNZ M.303322, 12: Fig. 1 View FIGURE 1 B). 1.16 × 0.76 mm.

Type locality. Three Kings Rise, New Zealand, 31.866 ˚S, 172.433 ˚E, 780–790 m, RV Rapuhia, 5 Feb. 1988, comminuted bryozoans and shell.

Etymology. Regalis   , Latin for royal in reference to the type locality.

Description. Shell small (to 1.16 mm: holotype. Fig. 1 View FIGURE 1 A), trochiform, depressed. Protoconch of 1 whorl, fine axials with strong median thickenings, no apertural varix, apertural margin straight. Teleoconch I of 1.125 whorls, 23–27 axial lamellae, no spiral sculpture. Teleoconch II of 0.66 whorl, suture strongly impressed. Shoulder with axial lamellae of increasing density (holotype), interstices with fine growth lines, no spiral sculpture. Base with slight constriction below selenizone, same strength and density of axial lamellae as on shoulder, indistinct spiral threads on last quarter whorl from below selenizone, growing fainter towards umbilicus. Umbilicus wide, rounded whorls, underside of protoconch visible. Selenizone above periphery, keels moderately strong, moderately elevated; slit open, margins parallel. Animal unknown.

Distribution. Three King Rise, 780– 790 m.

Remarks. This species is only known from the type lots. Scissurella regalis   is strikingly similar to Sinezona platyspira   n. sp., but the slit has parallel rather than convergent margins and the axial lamellae extend almost to the selenizone rim on the last half whorl. The crowding of the axial lamellae towards the apertural margin in the holotype indicates that it is a fully-grown specimen and not a juvenile of a Sinezona   species, in which the foramen has yet to close. A comparable Scissurella-Sinezona pair is Scissurella azorensis Nolt, 2008   and Sinezona semicostata Burnay & Rolán, 1990   , from the Macaronesian Islands. Small specimens of Sci. regalis   and Sin. platyspira   may be indistinguishable based on shell morphology.

Scissurella prendrevillei Powell, 1933   (DLG [pers. obs.] suspects that Sci. marshalli Bandel, 1998 is a synonym) from New Zealand has a protoconch with fine axials but has less distinct median thickenings, has fewer axial lamellae on teleoconch I (17–20 vs. 23–27), and usually has broad but low spiral cords surrounding the umbilicus. Scissurella azorensis   from the Azores and the Western Mediterranean and Sci. maraisorum Geiger, 2006 from eastern South Africa have broader and lower axial cords, which do not reach the suture, and have no spiral sculpture on shoulder or base. The Panamic Scissurella kaiserae Geiger, 2006   has a shorter teleoconch I (<1 vs.> 1 whorl), lacks spiral sculpture on the shoulder, and the axial cords are at most as tall as wide. Scissurella lobini (Burnay & Rolán, 1990)   from the northeastern Atlantic has a protoconch with more widely spaced axial cords devoid of a median thickening, lacks spiral sculpture on the teleoconch, and has at least 50 % fewer axial cords.

NMNZ

Museum of New Zealand Te Papa Tongarewa

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Family

Scissurellidae

Genus

Scissurella

Loc

Scissurella regalis

Geiger, Daniel L. & Marshall, Bruce A. 2012
2012
Loc

Scissurella kaiserae

Geiger 2006
2006
Loc

Scissurella lobini (Burnay & Rolán, 1990)

Burnay & Rolan 1990
1990
Loc

Scissurella prendrevillei

Powell 1933
1933