Dadagulella delgada ( Muratov, 2010 ) Rowson & Tattersfield, 2013

Rowson, Ben & Tattersfield, Peter, 2013, Revision of Dadagulella gen. nov., the “ Gulella radius group ” (Gastropoda: Streptaxidae) of the eastern Afrotropics, including six new species and three new subspecies, European Journal of Taxonomy 37, pp. 1-46 : 15

Dadagulella delgada ( Muratov, 2010) comb. nov.

Figs 27 , 84 ; Table 1

Gulella delgada Muratov, 2010: 274 , 276-277, figs 37, 39-45.

Type material examined

None.

Type locality

“ Mozambique: Cabo Delgado: 1.1 km WNW of lighthouse, 19 km NE of Palma, 10.68883°S, 40.62806°E, alt. 11 m, 24 Nov. 2009, I.V. Muratov.” ( Muratov 2010).

Other material examined

None.

Description

SHELL ( Fig. 27 ). Medium-sized (3.80 - 4.00 mm high x 1.80 - 1.80 mm wide), of 6.5 - 7.5 whorls. Elongate ovate-acuminate, spire narrowly acuminate (spire angle 43 - 49°). Apex sharply pointed (with axis slightly deviated in one syntype). Embryonic whorls smooth. Later whorls with very few, widely-spaced, flaring, subtriangular, lamella-like ribs (about 7 per mm on penultimate whorl). Sutures very deep. Umbilicus narrowly open. Peristome incomplete parietally. Outer palatal surface of aperture with a depression corresponding to the palatal tooth. Dentition 5-fold, consisting of: one lamella-like parietal tooth; one slab-like palatal tooth, forming a parieto-palatal sinus; one basal denticle; a deep-set columellar baffle and one shallower columellar denticle. Juvenile shells with 3-fold dentition: one parietal lamella; one basal tooth and one columellar thickening. Muratov (2010) found no internal dentition in the upper whorls. Anatomy unknown.

Range and habitat

At the type locality, vegetation on coral rag ( Muratov 2010: 284).

Remarks

The few, flaring, lamella-like ribs and elongate, narrowly acuminate spire of D. delgada comb. nov. allow it to be separated from other species, including some D. radius comb. nov. s.l. which it resembles in size and dentition.

Figures

Figs 27-35. Adult shells of Dadagulella gen. nov. species. 27. D. delgada (Muratov, 2010) comb. nov., syntype, Cabo Delgado (after Muratov 2010). 28. D. ecclesiola sp. nov., holotype, Kimboza. 29. D. cresswelli sp. nov., holotype, Ngorongoro. 30. D. minareta sp. nov., holotype, Kimboza. 31. D. cuspidata (Verdcourt, 1962) comb. nov., holotype, Shume. 32. D. pembensis sp. nov., holotype, Ngezi. 33. D. nictitans (Rowson & Lange, 2007) comb. nov., holotype, Macha. 34. D. frontierarum sp. nov., holotype, Mtai. 35. D. delta sp. nov., holotype, Mwanihana.

Fig. 84. Distribution of Dadagulella gen. nov. species, based on published records and material examined here (for additional records of D. meredithae comb. nov. in northern Malawi see van Bruggen 2000). The inset on the left corresponds to the map on the right.