Rapa sp. cf. R. incurva ( Dunker, 1852 ), 1792

Oliverio, Marco, 2009, Diversity of Coralliophilinae (Mollusca, Neogastropoda, Muricidae) at Austral Islands (South Pacific), Zoosystema 31 (4), pp. 759-789 : 782-784

Rapa sp. cf. R. incurva ( Dunker, 1852)

( Figs 11 C-E; 12E)

Bulbus incurvus Dunker, 1852: 126 .

TYPE MATERIAL. — Rapa incurva : Holotype ( ZMB 103.967 ).

TYPE LOCALITY. — Bulbus incurvus: Uncertain : “ China?” [no locality given on label of the holotype].

MATERIAL EXAMINED. — The type material of R. incurva and:

Banc Président Thiers, BENTHAUS, stn DW 1926, 24°38.2’S, 146°00.8’W, 50-90 m, 1 juv dd, 1 juv lv ( Figs 11 C-E; 12E).

DISTRIBUTION. — Rapa incurva : Pacific Ocean,from the Kii Peninsula, Japan, “intertidal to 20 m, in base of soft corals” ( Higo et al. 1999: 221). From New Caledonia and Loyalty Islands, empty shells in 20 m, alive in 17- 31 m.

REMARKS

Protoconch of 3.7 whorls, 710 µm high and 730 µm wide at the base. Protoconch I of 0.8 whorls covered by pustules. Protoconch II of about 2.9 whorls, with 2 major spiral keels (the abapical starting on the early second protoconch whorl, the adapical starting at the end of the second protoconch whorl), and one minor subsutural keel, sculptured with a series of threads over each keel. Spiral microsculpture evident on the keels.The specimens of the present material, are somehow different from juveniles of Rapa incurva in having a more spherical shape. It is possible, similarly to what happens in Leptoconchus , that also Rapa includes cryptic species of difficult morphological interpretation.

Figures

FIG. 11. — A, Leptoconchus lamarckii Deshayes, 1863, N of Raivavae, BENTHAUS, stn DW 1943, 23°48.7’S, 147°39.1’W, 950 m; B, Leptoconchus sp. [peronii (Lamarck, 1818) group], Marotiri Is., BENTHAUS, stn DW 1888, 27°51.4’S, 143°31.4’W, 120-100 m; C-E, Rapa sp. cf. R. incurva (Dunker, 1852), Banc Président Thiers, BENTHAUS, stn DW 1926, 24°38.2’S, 146°00.8’W, 50-90 m; F, G, Magilus antiquus (Montfort, 1810), Hiri Bay, ATELIER RAPA 2002, stn 9, 27°37.3’S, 144°22.2’W, 3-24 m (inside the faviid coral). Scale bars: A, 10 mm; B-E, 5 mm; F, 30 mm; G, 20 mm.