This small-sized taxon has reduced pegs on the inner side of the operculum. The bursa copulatrix is short with the bursal duct opening mid ventrally. The shell is ovate-conic with the inner lip either attached to the parietal wall or narrowly separated from it (as in the figured specimen).
The genus is diagnosed as follows by Ponder et al. (2021).
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.
Nundalia secreta Ponder, Zhang, Hallan & Shea, 2019
Class Gastropoda
Infraclass Caenogastropoda
Order Littorinida
Suborder Rissoidina
Superfamily Truncatelloidea
Genus Nundalia Ponder, Zhang, Hallan & Shea, 2019 (Type species: Nundalia secreta Ponder, Zhang, Hallan & Shea, 2019).
Original name: Nundalia secreta Ponder, Zhang, Hallan & Shea, 2019. In Ponder, W. F., Zhang, W. -H., Hallan, A., & Shea, M. E. (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): 1-67.
Type locality: South Head Creek, Nundle State Forest, NE NSW.
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Living on vegetation in small spring-fed streams.
Small steams, Great Dividing Range near Nundle, northeast NSW.
Ponder, W. (2019). Tateidae Thiele, 1925. Pp. 134-138 in C. Lydeard & Cummings, K. S. Freshwater Mollusks of the World: a Distribution Atlas. Baltimore, John Hopkins University Press.
Ponder, W. F., Zhang, W. -H., Hallan, A., & Shea, M. E. (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): 1-67.
