Granulifusus norfolkensis, Kantor & Fedosov & Snyder & Bouchet, 2018

Kantor, Yuri I., Fedosov, Alexander E., Snyder, Martin Avery & Bouchet, Philippe, 2018, Pseudolatirus Bellardi, 1884 revisited, with the description of two new genera and five new species (Neogastropoda: Fasciolariidae), European Journal of Taxonomy 433, pp. 1-57 : 30-32

Granulifusus norfolkensis sp. nov.

urn:lsid:zoobank.org:act:7483C94B-51FD-44D8-B117-B7140B65F385

Fig. 7 A–D

Diagnosis

Shell thin, slender, fusiform, up to 14 mm, protoconch of 4 whorls. Teleoconch whorls weakly convex, axial sculpture of narrow, broadly spaced, axial ribs, spiral sculpture of evenly spaced, strong primary cords, 7 on last whorl and weaker secondary cords between them. Aperture weakly lirate inside, columella with several distinct columellar plicae. Teleoconch light tan with several brown spiral bands present, also on siphonal canal.

Etymology

The specific epithet refers to the collecting locality, the Norfolk Ridge, where the first known specimen of this species was collected.

Type material

Holotype

NEW CALEDONIA: north of Ile des Pins , 22°28′ S, 167°29′ E, 404–405 m, expedition KANACONO, stn DW4685, sequenced ( MNHN IM-2013-68811).

Other material examined

NEW CALEDONIA: 1 lv, TERRASSES, stn DW3063, Norfolk Ridge, 23°23′ S, 168°00′ E, 430–480 m, sequenced ( MNHN IM-2007-36921).

Description

Shell thin, slender, fusiform, of nearly 4 protoconch and 5 teleoconch whorls (in holotype). Protoconch acutely conical ( Fig. 7C ), with moderately convex whorls, last ½ whorl with 6 axial, progressively thickening, riblets, protoconch/teleoconch transition abrupt, marked by onset of distinctive sculpture. Protoconch diameter 1130 µm, exposed height 1150 µm. Teleoconch whorls weakly convex, suture deeply impressed. Axial sculpture of broad, prominent ribs extending from suture to suture (7 per whorl in holotype), including on last and penultimate whorls. Spiral sculpture of evenly spaced, strong, raised cords, nodulous at crossings with axial ribs, in holotype 2 on first whorl, 3 on other whorls, 7 on last whorl before transition to canal. Three or four weaker secondary cords situated between primary cords, slightly nodulous at intersections with raised growth lines. Two brown secondary cords situated in each interspace between primary cords on last whorl. Siphonal canal open, long, slightly turned to left and recurved, sculptured by 25 (in holotype) weaker cords of slightly uneven strength. Aperture with 8 weak lirae inside. Inner lip completely adherent to columella, forming very thin, shiny columellar callus with 4 columellar plicae, first very weak. No umbilicus. Protoconch transparent flesh colour, interior of aperture white. Teleoconch light tan with several brown spiral bands also present on canal. Major spiral cords slightly lighter than background, secondary spiral cords mostly brown.

Holotype measurements: SL 13.0 mm, AL (without canal) 3.5 mm, SW 4.7 mm.

Distribution

Known only from southern New Caledonia, off Ile des Pins and Norfolk Ridge, in 404– 480 m. The multispiral protoconch suggests a planktonic dispersal phase and a possibly broader distribution.

Remarks

The species is known from just two specimens, the holotype and a slightly larger specimen attaining SL 13.8 mm ( Fig. 7D ). Granulifusus norfolkensis sp. nov. can be recognized by its small size, coloration and constricted aperture. Conchologically it is most similar to Granulifusus tatianae sp. nov., also from southern New Caledonia, but differs in having a smaller and more slender shell with longer siphonal canal and brown spiral bands.

Figures

Fig. 7. A–D. Granulifusus norfolkensis sp. nov. A–C. Holotype, SL 13.0 mm, sequenced (MNHN IM-2013-68811). D. New Caledonia, Norfolk Ridge, 23°23′ S, 168°00′ E, 430–480 m, sequenced specimen (MNHN IM-2007-36921). E–J. Granulifusus tatianae sp. nov. E–G. Holotype (MNHN IM- 2000-33595). H. Paratype, SL 15.0 mm (MNHN IM-2000-33596). I. New Caledonia, SMIB 3, stn DW8, 24°45′ S, 168°08′ E, 233 m, SL 18.1mm. J. New Caledonia, CHALCAL 2, stn DW84, 23°24′ S, 168°07′ E, 170 m, SL 17.7 mm. All shells to the same scale.