Rowsonia pirriei (L. Pfeiffer, 1855 )

Páll-Gergely, Barna, Hunyadi, András, Grego, Jozef, Sajan, Sheikh, Tripathy, Basudev & Chen, Zhe-Yu, 2020, A review of the Diapheridae (Gastropoda: Eupulmonata: Streptaxoidea), with special emphasis on India and Myanmar, Raffles Bulletin of Zoology 68, pp. 682-718 : 702

Rowsonia pirriei (L. Pfeiffer, 1855)

Pupa pirriei L. Pfeiffer, 1855: 295 .

Ennea (Huttonella) pirriei — Nevill, 1878: 7.

Ennea (Sinoennea) pirriei — Kobelt, 1904b: 156, pl. 19, fig. 9.

Ennea (Huttonella) pirriei — W.T. Blanford & Godwin-Austen, 1908: 22.

Gulella pirriei — Richardson, 1988: 114.

Gulella (Huttonella) pirriei — Ramakrishna et al., 2010: 193.

Sinoennea pirriei — Raheem et al., 2014: 145, fig. 94D–F.

Type locality. “ Koondah Mountains , near Calicut ” .

Material examined. Lectotype, designated by Raheem et al. (2014) ( NHMUK 20110265 /1) + 3 paralectotypes ( NHMUK 20110265 ), Koondah [Kundah] Hills, near Calicut, coll. Mr. Pirrie, ex coll. Museum Cuming.

Remarks. Aperture oval with laterally strongly elongated, slender sinulus. Peristome continuous, smeared onto the penultimate whorl. Parietal callus rounded, reaching ca. ¼ of penultimate whorl. Parietal lamella prominent, elevated, sharp, rather straight, its middle part slightly bent to palatal direction. Palatal wall with a deeply situated low fold that is facing the bent part of the parietal lamella; two additional, very deeply situated, elongate folds are present on the palatobasal area. These are visible in straight view into the aperture. Columellar lamella strongly developed, its middle part with a sinulus, in which the inner end of the parietal lamella fits.

This species differs from all other species of this genus in its shell shape and size, but agree with the arrangement of the apertural barriers. Thus, at the moment we classify it in Rowsonia , new genus.