Cerodrillia carminura (Dall, 1889)

Fallon, Phillip J., 2016, Taxonomic review of tropical western Atlantic shallow water Drilliidae (Mollusca: Gastropoda: Conoidea) including descriptions of 100 new species, Zootaxa 4090 (1), pp. 1-363 : 63

Cerodrillia carminura (Dall, 1889)

Drillia thea var. carminura Dall, 1889a: 91 : Maury (1922: 151).

Cerodrillia thea (Dall, 1889) (as synonym of): Abbott (1974: 271); Rios (2009: 311).

Not this species or unconfirmed reports.

Cerodrillia carminura (Dall, 1889) : Williams (2005, 2006, 2009: species 1520).

Type material. Holotype (by monotypy), 11.5 x 4.0 mm (USNM 93970). The specimen has not been examined for this work, has been missing since at least 26 Jul 1965 (note in specimen tray), and has not been illustrated or photographed.

According to Dall (1989: 91) two specimens from a Blake expedition off Barbados “appear to be of the same sort” but were “dead and faded”. These two are in MCZ 7074, labeled as syntypes of Drillia thea var. carminura , are excluded from the type series on account of Dall’s expressed uncertainty about their identity (ICZN 2000 Article 72.4.1). These two Barbados specimens have been incorporated as paratypes of Splendrillia abdita , new species, in this work and are shown in Plate 142 , Figs. 3–4.

Type locality. USFC Sta. 2402, Gulf of Mexico, 28°36'00"N, 85°33'30"W [between Mississippi R. delta and Cedar Keys, approximately 120 km SSW of Cape San Blas, W Florida], in 111 fms [203 m].

Range and habitat. Known only from the holotype.

Description. The following description is given by Dall:

"A still paler form [than Cerodrillia thea (Dall, 1884) ] without any band was dredged by the U.S. Fish Commission in 111 fms, in the Gulf of Mexico, at Station 2402. In this specimen the nucleus was of a lovely bright carmine color. This form, which is probably peculiar to deep water, may take the varietal name of carminura . It has seven whorls beside the nucleus, of a lemonade color, with nine ribs on the penultimate whorl, rather straighter than in the type [of C. thea ] and less swollen on the periphery.”

Remarks. Nomenclature. This species was described without illustration as a deep-water form of Cerodrillia thea (Dall, 1884) , being paler, slimmer, of a lemonade color and having a carmine-colored protoconch (Dall, 1889a: 91). The specimen illustrated by Williams has not been examined for its possible agreement with Dall’s description and as such is a candidate neotype.

Figures

PLATE 142. Splendrillia abdita, new species. Figs. 1 – 2: holotype, offshore, Barbados (USNM 87468). Fig. 1: ventral, lateral & dorsal views; Fig. 2: enlarged view of protoconch (not to scale). Figs. 3 – 4: paratypes, offshore, Barbados (MCZ 7074).