Reynellona bollandi, 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 : 582-586

Reynellona bollandi n. sp.

( Fig. 9 ) TYPE MATERIAL. — Holotype (dd) LACM 2455 and 13 paratypes LACM 2456 ; 2 paratypes (lv) AMS; 1 paratype each MNHN, SMF 308415 and MZB 31020.

TYPE LOCALITY. — 1 km WNW Onna Village, Horseshoe Cliffs, Okinawa, 26°30’N, 127°51’E, 46- 55 m.

ETYMOLOGY. — The specific epithet honors R. F. Bolland, who made superb collections of Okinawa micromolluscs in 1978, including the present new species.

MATERIAL EXAMINED. — A total of 74 specimens (14 lots).

Western Australia. N end Mermaid Reef, Rowley Shoals, 17°03’S, 119°36’E, 18-20 m, outside coral reef, 1986, leg. Bratcher, 2 dd ( LACM 86-250.1).

Japan. 1 km WNW Onna Village, Horseshoe Cliffs, Okinawa, 26°30’N, 127°51’E, 46-55 m, 1978, leg. Bolland, 17 dd (holo- and paratypes LACM, MNHN, SMF, MZB). — Zampa-misaki (= Bolo Point), Okinawa, 2 lv (paratypes AMS). — C. 1 km N Nakijin Village, Nakijin, Okinawa, 26°42’N, 127°56’E, 33 m, 1978, leg. Bolland, 5 dd ( LACM 78-22.6). — 1 km W Onna Village, Horseshoe South, Okinawa, 26°30’N, 127°51’E, 33 m, 1978, leg. Bolland, 2 dd ( LACM 78-20.5). — 1 km W Onna Village, Horseshoe South, Okinawa, 26°30’N, 127°56’E, 50 m, 1978, leg. Bolland, 1 dd ( LACM 78-99.4). — 1 km WNW Onna Village, Okinawa, 26°30’N, 127°51’E, 45 m, 1978, leg. Bolland, 2 dd ( LACM 78- 26.4). — 1 km WNW Onna Village, Okinawa, 26°30’N, 127°51’E, 55 m, 1978, leg. Bolland, 9 dd ( LACM 78-27.7). — 1 km WNW Onna Village, Okinawa, 26°30’N, 127°51’E, 60 m, 1978, leg. Bolland, 6 dd ( LACM 78-29.3). — 1 km WNW Onna Village, Okinawa, 26°30’N, 127°51’E, 63 m, 1978, leg. Bolland, 10 dd ( LACM 78-101.3). — Horseshoe Cliffs, 1 km WNW Onna Village, Okinawa, 26°29.6’N, 127°50.5’E, 60 m, gravel, 1979, leg. Bolland, 6 dd ( LACM 79-76.5). — 1.5 km ESE Zampa-misaki (= Bolo Point), Okinawa, 26°26’N, 127°42’E, 43 m, 1978, leg. Bolland, 2 dd ( LACM 78- 24.4). — 0.5 km ESE Zampa-misaki (= Bolo Point), Okinawa, 26°26’N, 127°42’E, 53 m, 1978, leg. Bolland, 9 dd ( LACM 78-100.6).

Hawaii. Kapa’a Beach Park, NW Hawaii, 20°13’N, 155°54.5’W, 11-15 m, dead coral and sand, 1986, leg. Don Shasky, 1 dd ( LACM 86-419.2).

DISTRIBUTION. — Indian Ocean: Western Australia; Pacific Ocean: Okinawa, Hawaii.

DESCRIPTION

Holotype ( Fig. 9 ). Shell small, rissoiform, consisting of seven whorls. Protoconch ( Fig. 9C ) of 2.5 whorls, sculptured in its later part with six spirally granular cords of uneven strength; cord located at mid-whorl stronger than others, extending by abapical side of broad, deep sinusigera notch; sinus bordered by recurved lip extending apically over preceding larval whorl. Protoconch axis slightly tilted over teleoconch axis. Teleoconch whorls convex, with suture rather shallow at bottom of narrow, deep furrow. Sculpture on spire consisting of two strong spiral cords, close to suture, forming nodular intersections with prosocline axial ribs; ribs weaker than spiral cords, 15 per whorl. Abapical spiral cord narrower and more prominent, giving body whorl slightly angular outline. Body whorl occupying 56% of total shell height. Base rather convex, sculptured by three prominent spiral cords undulating strongly when intersecting axial sculpture. An additional cord, vertical along narrow umbilical chink. Aperture rounded, forming volcano-shaped protrusion. Peristome appearing clearly cut in lateral view; varix of outer lip broadly extending backwards, but only slightly thickened.

Dimensions

H = 2.2 mm, D = 1.2 mm.

REMARKS

Reynellona bollandi n. sp. closely resembles R. semipellucida Kase, 1998 , but the latter species is more slender and its sculpture consists of two beaded spiral rows instead of bi-tuberculated axial ribs as in R. bollandi n. sp. The sculpture of R. bollandi n. sp. indeed more closely resembles that of Mareleptopoma iredalei , which is smaller (1.6 mm vs 2.2 mm in R. bollandi n. sp.) having however a larger protoconch (280 µm in diameter vs 180 µm) and a strongly prominent outer lip. Another species with beaded sculpture is Sansonia sumatrensis , which is rissoiform (which is unusual for a Sansonia ), and differs by its peristome thickened into a prominent rim, its base sculptured with a single strong cord separated from the periphery by a broad furrow (vs two weaker beaded cords in R. bollandi n. sp.), and its distinctly open umbilicus.

Reynellona borbonica n. sp.

( Fig. 10 )

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 ). Shell small, rissoiform, white, consisting of seven whorls. Protoconch ( Fig. 10C ) 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 .

Genus Sansonia Jousseaume, 1892 Mecoliotia Hedley, 1899: 555 , fig. 68; type species: M. halligani Hedley, 1899 , by original designation.

Pickworthia Iredale, 1917: 332 , 333, pl. XIII figs 6-8; type species: P. kirkpatricki Iredale, 1917 , by original designation.

TYPE SPECIES. — Iphitus tuberculatus Watson, 1886 , by monotypy.

Figures

FIG. 9. — Reynellona bollandi n. sp., holotype, Okinawa, Japan (LACM 2455), H = 2.2 mm; A, B, apertural and side views; C, protoconch. Scale bar: C, 100 µm.

FIG. 10. — Reynellona borbonica n. sp., La Réunion, Marion-Dufresne, cruise MD 32, stn DR47 (MNHN); A, B, holotype, H = 3.1 mm; C, paratype, protoconch. Scale bar: C, 100 µm.