Nanotrachia undetermined

Köhler, Frank & Criscione, Francesco, 2013, Small snails in a big place: a radiation in the semi-arid rangelands in northern Australia (Eupulmonata, Camaenidae, Nanotrachia gen. nov.), Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 169 (1), pp. 103-123 : 119-120

publication ID

https://doi.org/ 10.1111/zoj.12051

publication LSID

lsid:zoobank.org:pub:281CB6ED-063E-4CF0-89A2-80EB3761BCDB

persistent identifier

https://treatment.plazi.org/id/03E187F3-002E-FFA7-15F8-7DD4857FFCC2

treatment provided by

Carolina

scientific name

Nanotrachia undetermined
status

SP.

NANOTRACHIA CARINATA SP. NOV.

Holotype

Australia, WA, EK, 40.6 km north-west of Nicholson Station Homestead , limestone area with numerous gullies, base of cliffs, Spinifex , and talus, under rocks in loose soil, 17°49′30″S, 128°34′40″E (coll. V. Kessner, 1 September 2009); dissected specimen ( WAM S66300 View Materials ). GoogleMaps

Paratypes

Same data as holotype; two wet ( WAM S49178 View Materials ), 85 dry ( WAM S49100 View Materials ) GoogleMaps .

Etymology

In reference to the peripheral keel of the shell, derived from ‘carinatus’ (Latin = possessing a keel), adjective of feminine gender.

Description

Shell ( Figs 4B View Figure 4 , 5A, B View Figure 5 ): Average in size; periphery shouldered, strongly keeled; spire weakly elevated; umbilicus open, wide, not concealed by columellar reflection; protoconch and teleoconch with dense, pointed periostracal projections and fine axial growth lines; teleoconch with weak, blunt, narrowly spaced axial ribs, interrupted on keel; apertural lip reflected, moderately expanded; yellowish–horn.

Genitalia ( Fig. 6C View Figure 6 ): Epiphallus very short, onequarter of penial length; no muscle fibres connect the epiphallus and penial apex. Vas deferens entering penial sheath almost halfway up. Penial wall thin, with two longitudinal pilasters, one wide, irregular, comprising half of penial wall, second pilaster thinner, irregularly shaped, winding, with regularly spaced, pointed corrugations; penial pore surrounded by subcircular ridge. Vagina slightly shorter than penis, half to twice as long as free oviduct.

Comparative remarks

Shell similar to N. coronata sp. nov., but smaller in size, axial ribs interrupted on keel. Differs from N. levis sp. nov. by presence of keel, from all other congeners by less developed axial ribs. The largest shells of N. carinata sp. nov. are similar to the smallest shells of O. elegans , which differ by more elevated spire and weaker developed periostracal projections. Genitalia identical to N. coronata sp. nov., N. levis sp. nov. has three pilasters, and all other species have smooth pilasters.

WAM

Western Australian Museum

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