Reynellona borbonica, Renard & Bouchet, 2003

Renard, Jacques Le & Bouchet, Philippe, 2003, New species and genera of the family Pickworthiidae (Mollusca, Caenogastropoda), Zoosystema 25 (4), pp. 569-591 : 584-585

publication ID	https://doi.org/10.5281/zenodo.5391846
DOI	https://doi.org/10.5281/zenodo.14936008
persistent identifier	https://treatment.plazi.org/id/520F4D6C-C508-FFFA-1755-FDC769A0FA03
treatment provided by	Marcus
scientific name	Reynellona borbonica
status	sp. nov.

Treatment

Reynellona borbonica View in CoL n. sp.

( Fig. 10 View FIG )

TYPE MATERIAL. — Holotype and 3 paratypes in MNHN.

TYPE LOCALITY. — La Réunion, Marion-Dufresne, cruise MD 32, stn DR47, 21°23’S, 55°37’E, 205- 215 m. ETYMOLOGY. — The specific name refers to the type locality, La Réunion, formerly called Île Bourbon. MATERIAL EXAMINED.— A total of 4 specimens (2 lots).

La Réunion. Marion-Dufresne, cruise MD 32, stn DR47, 21°23’S, 55°37’E, 205-215 m, 3 dd (holo- and paratypes). — Stn DC26, 21°22’S, 55°47’E, 310 m, 1 dd (paratype).

DISTRIBUTION. — Indian Ocean: La Réunion.

DESCRIPTION

Holotype ( Fig. 10A, B View FIG ). Shell small, rissoiform, white, consisting of seven whorls. Protoconch ( Fig. 10C View FIG ) with smooth initial whorl, with globular, prominent nucleus; second larval whorl sculptured with six evenly spaced rows of granules. Protoconch ending in broad sinusigera notch, not lined by raised lip. Teleoconch forming slightly pupiform conical spire, with flat whorls. Early teleoconch whorls sculptured with two spiral cords, close to suture; following whorls bearing four, equidistant, sub-equal cords with small but prominent nodules aligned along axial riblets. Riblets becoming obsolete on older part of teleoconch whorls. Suture at bottom of deep furrow, just below obsolete, smooth spiral cord. Body whorl occupying 60% of total shell height. Base convex, with five concentric cords, plus one small cord extending into umbilicus; axial sculpture not extending over base. Umbilicus reduced to narrow chink along columella; apertural tube overhanging umbilicus. Fine incremental lines visible on body whorl. In addition, microsculpture of small granules scattered all over teleoconch. Peristome formed by successive concentric tubes, flaring at their ends, and together forming conical protrusion over oblique plane of peristome. No labral varix present.

Dimensions

H = 3.1 mm, D = 1.7 mm. REMARKS

The general appearance is that of many Rissoidae , but allocation to the Pickworthiidae is fairly certain. Characters of the spire, base, and aperture suggest placement in Reynellona . The sculpture of four spiral cords with nodules aligned along axial costulae resembles that of Microliotia Boettger, 1902 .