Diplommatina regularis Fulton, 1901

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 : 17

publication ID	https://doi.org/ 10.5852/ejt.2017.337
publication LSID	lsid:zoobank.org:pub:2669CB69-5064-4B5D-AC25-856680E3B9AA
DOI	https://doi.org/10.5281/zenodo.3850694
persistent identifier	https://treatment.plazi.org/id/03C6CF41-FFF4-FFFB-FD94-451FD6E4F868
treatment provided by	Carolina
scientific name	Diplommatina regularis Fulton, 1901
status

Treatment

Diplommatina regularis Fulton, 1901 View in CoL

Figs 7A View Fig , 9J View Fig

Diplommatina regularis Fulton, 1901: 245 View in CoL .

Diplommatina regularis View in CoL – Kobelt 1902: 442. — Gude 1921: 330.

Diplommatina (Diplommatina) regularis View in CoL – Zilch 1953: 21, figs 125–126. — Ramakrishna et al. 2010: 91. — Budha et al. 2015: 7.

Diagnosis

Measurements (n = 8): SH 2.5–3.0 mm, SW 1.3–1.5 mm, Wh 7.0–7.5. Dextral, penultimate whorl slightly larger than the body whorl. Constriction at columellar margin slightly towards the inner lip of the parietal wall ( Fig. 9J View Fig ). One parietalis, short ( Fig. 7A View Fig 3 View Fig ). One vertical palatalis, parallel to the constriction. One short horizontal palatalis, situated just above the columella ( Fig. 9J View Fig ). Columellaris moderately thin. Columellar tooth weak, only visible in mature shells ( Fig. 7A View Fig 3 View Fig ). Protoconch smooth, with small pits distributed all over ( Fig. 7A View Fig 1 View Fig ). Teleoconch with regular radial ribs; about 8–11 ribs/ 0.5 mm on the penultimate whorl; 5–8 ribs/ 0.5 mm on the body whorl towards the aperture ( Fig. 7A View Fig 2 View Fig , A 4 View Fig ). Very fine spiral striation present. Umbilicus closed. Outer lip at BeP abruptly curved on the columella, closing the umbilicus. Peristome thin, with two close lips ( Fig. 7A View Fig 4 View Fig ); AeP slightly curved, a single lip in most immature shells. Very thin parietal callus, extending at the base. Operculum paucispiral, corneous, thin, transparent, slightly concave, outer surface smooth, inner surface with raised peripheral circular edge.

Material examined

Possible syntype

INDIA: 1 shell [ D. regularis Fulton, 1901 Darjeeling Sow. & F. 01.10.1901 1/6] ( RBINS 525556, MT1099).

Other material examined

NEPAL: 20 shells, Baghdwar, Shivapuri-Nagarjun National Park, 2314 m, 27.805203 N, 85.390029 E, 24 Jun. 2007, P.B. Budha leg. ( CDZMTU 045); 9 shells, Ghopte, Langtang National Park, 3419 m, 28.0193 N, 85.4619 E, 8 Jun. 2007, P.B. Budha leg. ( CDZMTU 060); 16 shells, Deurali, Langtang National Park, 3247–3277 m, 28.1059N, 85.3266 E, 6 Jun. 2007, P.B. Budha leg. ( CDZMTU 061).

Remarks

D. regularis is a very distinct species due to its regularly increasing whorls. Many shells with adult size show a single, very thin peristomal lip typical of juvenile shells. Juvenile shells show a more distinct constriction at the columellar margin than the fully grown shells.