Systematic revision of the Plectopylinae (Gastropoda, Pulmonata, Plectopylidae) Author Páll-Gergely, Barna 31E196E9-5A51-4295-9A36-D5DA689502B7 Centre for Agricultural Research, Hungarian Academy of Sciences (MTA), Herman Ottó Street 15, Budapest, H- 1022, Hungary. pall-gergely.barna@agrar.mta.hu text European Journal of Taxonomy 2018 2018-08-16 455 1 114 journal article 22297 10.5852/ejt.2018.455 44a2fcf6-cc1b-4c07-9554-dd6dd279a76d 3817707 C445E95B-446A-4601-AAA3-C1CCBAB627F9 Naggsia oligogyra sp. nov. urn:lsid:zoobank.org:act: 13CE6536-3C26-421E-ACA1-270750697E3A Figs 31F , 32 G–H Diagnosis A large, flat, dextral species with few (5) whorls; parietal wall with a single lamella, and a main plica free from the deeply situated apertural fold. Differential diagnosis The shell of the new species resembles N. laomontana , which has about a whorl more and only a single lamella on the parietal wall. Etymology The species is named after its few whorls, from the Greek ‘ oligos ’, meaning few and ‘ gyros ’, meaning whorl. Material examined Holotype THAILAND : 1 shell (D = 21.0 mm), Chiang Mae Province , Doi Pha San Sao Mountain , 1 km W of Ban Prang Ma-o , 19°25′58.26″ N , 99°4′14.02″ E , 500 m a.s.l. , 19 Jun. 1987 , F.G. Thompson leg. ( UF 346781). Paratypes THAILAND : 2 broken shells, same data as for holotype ( UF 448574); 1 broken shell, same data as for holotype ( HNHM 97457). Description SHELL. Dextral, flat, with five rapidly increasing whorls, separated by a rather shallow suture; only strongly weathered shells were available for study, and therefore the sculpture could not be observed in detail; protoconch with fine ribs; teleoconch with inconspicuous, irregular riblets and paler reddish transverse stripes; peristome relatively thin, only slightly reflected and thickened; parietal callus low and blunt; apertural fold weak, situated far from parietal callus. One shell was opened. Parietal wall with a single, straight lamella having slight horizontal extensions above and below in both anterior and posterior directions; main plica free from lamella, starts near upper end of lamella, and does not reach apertural fold. Palatal wall with six plicae; first situated close to upper suture, short; second to fifth oblique, second being the longest; sixth curved, concave. MEASUREMENTS (in mm). D = 21.0, H = 6.3 ( holotype ). Distribution The new species is known from the type locality only, where it occurs together with C. leiophis ( Fig. 17 ).