Nundalia, Zhang, 2019

Zhang, - H., 2019, New taxa of Tateidae (Caenogastropoda, Truncatelloidea) from springs associated with the Great Artesian Basin and Einasleigh Uplands, Queensland, with the description of two related taxa from eastern coastal drainages, Zootaxa 4583 (1), pp. 1-67 : 55-56

Genus Nundalia n. gen.

Type species: Nundalia secreta n. sp.

Description. Shell small, conical, whorls convex, with growth lines only; peristome slightly to moderately thickened, non-umbilicate but umbilical chink present. Operculum thin, yellowish, subpyriform, paucispiral with last whorl large, nucleus acentric; inner surface with 2 or 3 reduced pegs near nucleus. Radula with central teeth having numerous cusps, median cusp narrow, sharp, about same length as adjacent cusps; lateral margins wide; innermost basal cusps rather narrow, sharp; basal tongue narrow, U-shaped. Male with prostate gland ovoid, with more than half in pallial roof. Pallial vas deferens simple to slightly undulating. Penis simple, of even thickness until distal end where it tapers to short papilla; glands and processes absent. Female with coiled oviduct with short, anteriorly-pointing arch. Bursa copulatrix short, behind albumen gland. Oviduct narrow, ventral channel simple, with slightly expanded vestibule and terminal slit-like opening. Albumen gland with about anterior third in pallial roof; without associated cowl or gutter.

Distribution. The type species is from swampy head waters of streams on the Great Dividing Range in the vicinity of Nundle, inland from Port Macquarie, lower North Coast, New South Wales.

Contained species. None previously described, one new species described below.

Etymology. Named for the town of Nundle, New South Wales. Gender feminine.

Remarks. This genus differs from other members of the Jardinella group in having an operculum with reduced pegs. These are much more developed than the rudimentary protuberances seen in some other members of the group. The radula is distinctive in having numerous sharp cusps on the central and lateral teeth. The bursa is short and subtriangular, with the bursal duct opening mid ventrally, a feature shared with Conondalia but not seen in other members of the Jardinella group.

No other species in this group are known from the general area in which it occurs, although it has not been well surveyed and other species may well be located in the future in streams along the Great Dividing Range of northern New South Wales.