Diplommatina silvicola Godwin-Austen, 1886

Budha, Prem B., Naggs, Fred & Backeljau, Thierry, 2017, The genus Diplommatina Benson, 1849 (Gastropoda: Caenogastropoda: Diplommatinidae) in Nepal, with the description of seven new species, European Journal of Taxonomy 337, pp. 1-30 : 20-22

Diplommatina silvicola Godwin-Austen, 1886

Figs 8A , 9M

Diplommatina (Diplommatina) silvicola Godwin-Austen, 1886: 178 .

Diplommatina (Diplommatina) silvicola – Gude 1921: 335. — Ramakrishna et al. 2010: 92. — Budha et al. 2015: 7.

Diagnosis

Measurements (n = 7): SH 2.3–2.5 mm, SW 1.2–1.3 mm, Wh 6.0–6.5. Dextral, penultimate and body whorls nearly equal in width, constriction at the middle of the parietal lip above the aperture ( Fig. 9M ). One long parietalis ( Fig. 8A 3 ). One vertical palatalis. Horizontal palatalis absent ( Fig. 9M ). Columellaris prominent. Columellar tooth distinct. Protoconch smooth, Wh 1.5, with minute pits, radial ribs absent ( Fig. 8A 1 ). Teleoconch with strong, widely spaced radial ribs, about 4–6 ribs/ 0.5 mm on the penultimate whorl; 5–7 ribs/ 0.5 mm on the body whorl towards the aperture ( Fig. 8A 2 , A 4 ). Spiral striation distinct. Umbilicus closed. Aperture circular. Peristome usually simple, but with two lips in some adult shells; inner lip very thick and elevated. Columellar margin of the peristome straight. Parietal wall of aperture not extending to the body whorl.

Material examined

Possible syntype

INDIA: 1 shell, [ D. silvicola Godwin-Austen 1886 Jatinga Valley, N. Cachar , India. W.F. Webb, ex. coll. Godwin-Austen 06.07.1928] ( RBINS 525561, MT 1104).

Other material examined

NEPAL: 11 shells, Panitanki, Balaju, Kathmandu at the base of a sandstone hill, Shivapuri-Nagarjun National Park, 1356 m, 27.736501 N, 85.298484 E, 14 Apr. 2008, P.B. Budha leg. ( CDZMTU 050); 2 shells, Raniban, Balaju, Kathmandu, 1780–1820 m, 27.745997 N, 85.287240 E, 4 Jan. 2009, Srijanal Khanal leg. ( CDZMTU 050b).

Remarks

Diplommatina silvicola is a very distinct species due to its ovate and transparent shell.

Figures

Fig. 8. A. Diplommatina silvicola Godwin-Austen, 1886 (CDZMTU050). B. D. sperata W.T. Blanford, 1862 (CDZMTU062). C. D. syabrubesiensis sp. nov., holotype (CDZMTU051). The yellow arrow indicates the dorsal fold. Scale bar in images A2, A4, B2, B4, C2, C4 is 500 µm.

Fig. 9. Palatal lamellae (palatalis) of species of Diplommatina. Dotted lines indicate the position of the constriction. Dark lines indicate the palatalis. A. D. abiesiana sp. nov. B. D. exserta Godwin- Austen, 1886. C. D. fistulata sp. nov. D. D. folliculus (L. Pfeiffer, 1846). E. D. godawariensis sp. nov. F. D. maipokhariensis sp. nov. G. D. miriensis Godwin-Austen, 1917. H. D. munipurensis Godwin- Austen, 1892. I. D. oviformis Fulton, 1901. J. D. regularis Fulton, 1901. K. D. salgharica sp. nov. L. D. shivapuriensis sp. nov. M. D. silvicola Godwin-Austen, 1886. N. D. sperata W.T. Blanford, 1862. O. D. syabrubesiensis sp. nov.

Fig. 3. Diplommatina Benson, 1849 of Nepal. A. D. abiesiana sp. nov., holotype (CDZMTU020). B. D. exserta Godwin-Austen, 1886 (CDZMTU024). C. D. fistulata sp. nov., holotype (CDZMTU025). The yellow arrow indicates the dorsal fold. Scale bar in images A2, A4, B2, B4, C2, C4 is 500 µm.

Fig.1. Map of the localities and areas surveyed for Diplommatina spp. in Nepal.

Fig. 2. Shell terminology. A. D. regularis Fulton, 1901. B. D. folliculus (L. Pfeiffer, 1846). C. General outline of the lower part of a shell from Diplommatina species. Abbreviations: Prt = Parietalis (Prt1 = inner parietalis, Prt2 = outer parietalis); Pt = Palatalis; Hpt = Horizontal palatalis (Hpt1 = lower, Hpt2 = upper in case of two); Vpt = Vertical palatalis (Vpt1 = left side, Vpt2 = right side in case of two).

Fig. 4. Diplommatina Benson, 1849 of Nepal. A. D. folliculus (L. Pfeiffer, 1846) (CDZMTU028). B. D. godawariensis sp. nov., holotype (CDZMTU032). C. D. maipokhariensis sp. nov., holotype (CDZMTU034). Scale bar in images A2, A4, B2, B4, C2, C4 is 500 µm.