Caecum lindae, Vannozzi & Pizzini & Raines, 2015

Vannozzi, Angelo, Pizzini, Mauro & Raines, Bret, 2015, Revision of South African Caecidae (Mollusca: Gastropoda), African Invertebrates 56 (1), pp. 99-99 : 118

Caecum lindae sp. n.

Figs 15 , 25K

Etymology: Named after Linda Davis, collections manager for Mollusca at NMSA.

Description: Tube subcylindrical, flaring towards the aperture. Aperture oblique, contracted, ending with three concentric rings. Septum protruding, with a strong, pointed mucro with subtriangular outline, slightly displaced toward the right side. Ventral side of the septum convex, dorsal one slightly concave. Early stages and operculum unknown. Length: 2.5 mm.

Type locality: SOUTH AFRICA: Eastern Cape: Agulhas Bank , off Cape Morgan Lighthouse , - 100 m.

Holotype ( Fig. 25K ): SOUTH AFRICA: Eastern Cape: dd, Agulhas Bank , off Cape Morgan Lighthouse , - 100 m, depth broken coral + shell from ( NMSA W9682 / T3924 ), length 2.5 mm, min. diam. (posterior end) 0.39 mm, diam. in the middle of the tube 0.5 mm, max. diam. (apertural end) 0.56 mm.

Distribution: Currently known only from the type locality, Cape Morgan, north of East London ( Fig. 15 ).

Remarks: Caecum lindae sp. n. shows a unique shape of the septum among South African species. It can only be compared with C. geigeri Pizzini & Raines, 2011 , described from Austral Is., due to the similar shape of the septum, but it can be distinguished by the different shape of the tube and by the absence of the strong annulations preceding the aperture.

Figures

Fig. 15. Distribution map of Caecum cf. oahuense Pilsbry, 1921 (■), C. sepimentum de Folin, 1868 (▲) and C. lindae sp. n. (▼).

Fig. 25. South and western African Caecum and Parastrophia species: (A) P. avaricosa sp. n., holotype, Mzamba (NMSA E1665/T3354); (B, C) P.ornata sp. n., Mzamba,near Natal border — (B) holotype (NMSA W9677/T3379), (C) paratype (JPM 2119); (D) C. sepimentum de Folin, 1868, Kosi Bay (NMSA S2010); (E) C. cf. oahuense Pilsbry, 1921, Aliwal Shoal, off Umkomaas area (JPM); (F) Caecum cf. gulosum Hedley, 1899, Kosi Bay (NMSA S2869); (G, H) C. succineum de Folin, 1880 — (G) between Bhanga Nek andKosi Bay (NMSAS1586), (H)Aliwal Shoal, off Scottburgh (NMSA W9684); (I) C. cf. glabrum (Montagu, 1803), Knysna, Gericke Point, Sedgefield (NMSA W9658); (J) C. glabrum (Montagu, 1803), Rabat, Morocco (MP); (K) C.lindae sp. n., holotype, Cape Morgan Lighthouse (NMSA W9682/T3924); (L, M) C. cf. musorstomi Pizzini, Raines & Vannozzi, 2013, Landers reef (JPM); (N, O) C.austrafricanum sp.n., paratypes,Walker’s Point,W of Knysna (NMSA W9656/T3351);(P) C.knysnaense sp.n., paratype,Knysna,Gericke Point,Sedgefield (NMSAW9673/ T3364); (Q) C. intortum sp. n., paratype, Walker’s Point, W of Knysna (NMSA W9669/T3360); (R) C. macrum van der Linden & Moolenbeek, 2000, Charbonnier, Senegal (MP); (S, T) C. crassum de Folin, 1870, Gabon (MP): (S) adult; (T) juvenile. Scale bar = 1 mm.