A review of the Diapheridae (Gastropoda: Eupulmonata: Streptaxoidea), with special emphasis on India and Myanmar Author Páll-Gergely, Barna Author Hunyadi, András Author Grego, Jozef Author Sajan, Sheikh Author Tripathy, Basudev Author Chen, Zhe-Yu text Raffles Bulletin of Zoology 2020 2020-08-06 68 682 718 journal article 10.26107/RBZ-2020-0083 2345-7600 5349761 83A57E5F-10AB-46EF-A35C-29B2E747851A Rowsonia Páll-Gergely , new genus Type species. Ennea beddomei W.T. Blanford, 1881 ( Fig. 12J–Q ). Diagnosis. Shell small to large, smooth to regularly ribbed, slender conical. Parietal callus well-developed to weak. Basal swelling not developed. Parietal lamella elongated inside, outer end usually straight, outer portion curves towards palatal wall. Inner portion curves towards columella. Palatal wall with an upper palatal tooth that faces the curved parietal lamella. There are two to three deeply situated, elongated additional folds (upper, middle, and lower palatal folds). Columellar lamella well-developed, sharp, oblique to shell axis. See Fig. 1O for explanation. RAFFLES BULLETIN OF ZOOLOGY 2020 Fig. 13. Pupennea planguncula ( Benson, 1863 ) , NHMUK 1875.3.6.39. Both scales represent 1 mm; scale “a” refers to fig. A, scale “b” refers to figs. B–I. Differential diagnosis. Rowsonia , new genus , differs from Ennea (compared only with the type species) in the following characters: the shell shape of the new genus is conical, whereas it is ovoid in Ennea ; the parietal lamella is short in Ennea , inner and outer portions of different orientation cannot be recognised; columellar lamella of Ennea is weak, low, and not visible from straight view to the aperture; the deeply situated folds are much longer than those of Rowsonia , new genus , and they correspond with grooves on the dorsal (“neck”) region. Pupennea , new genus is ovoid, possesses two teeth on the columellar side (columellar lamella and denticle), has a shorter parietal lamella, has a complex structure consisting of the upper and lower parietal teeth, and lacks deeply situated palatal folds. Sinoennea species are usually elongate ovoid and cylindrical in shell shape, lack any deeply situated parietal/basal folds, usually have a prominent basal swelling and there is a depression that corresponds with the upper palatal tooth. See under Platylennea , new genus . Included species. Rowsonia beddomei (W.T. Blanford, 1881 ) , R. canarica (W.T. Blanford, 1869 ) , R. pirriei (L. Pfeiffer, 1855 ) , R. sculpta (W.T. Blanford, 1869 ) , and R. turricula (W.T. Blanford, 1899 ) . Etymology. This genus is dedicated to and named after Ben Rowson (National Museum of Wales), a specialist of the Streptaxoidea . Grammatical gender: feminine. Distribution. Southern India ( Fig. 10 ). Remarks. The most closely related genus is probably Platylennea , new genus , which also inhabits southern India . The distinction of the two groups is clear, and thus, these two groups should be separated as distinct genera. However, the morphological diversity of Sinoennea is still larger than the difference between Platylennea , new genus and Rowsonia , new genus .