Nanotrachia, ORIENTALIS (SOLEM, 1984)

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 : 121-122

NANOTRACHIA ORIENTALIS ( SOLEM, 1984)

Mouldingia orientalis Solem, 1984: 644–647 , pl. 53, figures 163d–f, 165.

Material examined: Table 1.

Diagnosis

Shell ( Fig. 4F ): 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 prominent blade-shaped, irregular, widely spaced axial ribs; apertural lip reflected, moderately expanded; brown.

Genitalia: Refer to Solem (1984: 647).

Comparative remarks

Shell differing from other congeners by bladeshaped axial ribs. Penial wall differing from

other congeners by more numerous and narrower pilasters.

Taxonomic remarks

Originally assigned to Mouldingia by Solem (1984) for its shell being extremely similar with the type species, M. occidentalis ( Fig. 4G ), from which it can only be distinguished by parietal lip being attached to callus.

KEY TO THE IDENTIFICATION OF SPECIES OF NANOTRACHIA

1. a. Peripheral keel and axial ribs present...............................................................................................2

b. Peripheral keel and axial ribs absent........................................................... Nanotrachia levis sp. nov.

2. a. Axial ribs regularly spaced and blunt ............................................................................................... 3

b. Axial ribs irregularly spaced and blade-shaped....................................................... Nanotrachia orientalis

3. a. Peripheral keel marked and acutely angled........................................................................................4

b. Peripheral keel week and obtuse......................................................................................................5

4. a. Axial ribs continuing onto keel; D ~ 10 mm or larger................................. Nanotrachia coronata sp. nov.

b. Axial ribs not continuing onto keel; D up to ~ 10 mm ................................ Nanotrachia carinata sp. nov.

5. a. One single longitudinal pilaster on inner penial wall............................................. Nanotrachia intermedia

b. More than one single longitudinal pilaster on inner penial wall................. Nanotrachia costulata sp. nov.

Figures

Figure 4. Shells of Nanotrachia species studied herein. A, N. intermedia (Solem, 1984) (paratype AM C.146110); B, Nanotrachia carinata sp. nov. (paratype WAM S49100); C, N. coronata sp. nov. (paratype WAM S49086); D, N. costulata costulata sp. nov. (WAM S49088); E, N. levis sp. nov. (paratype WAM S49096); F, N. orientalis (Solem, 1984) (paratype AM C.146105); G, Mouldingia occidentalis (Solem, 1984) (paratype AM C.146107). Scale bar = 1 cm.