Diplommatina, Benson, 1849

Hausdorf, Bernhard, 2017, Revision of the Diplommatinidae (Gastropoda: Cyclophoroidea) from Java, Zootaxa 4312 (2), pp. 201-245 : 204

Key to the Diplommatina species from Java

1a. Shell sinistral....................................................................................... 2

1b. Shell dextral........................................................................................ 7

2a. Shell height 4.5–5.1 mm; last whorl almost flat.................................................. D. planicollis

2b. Shell height smaller than 3.5 mm ........................................................................ 3

3a. Last whorl with a spiral depression............................................................. D. sulcicollis

3b. Last whorl without a spiral depression.................................................................... 4

4a. Shell widely ribbed (18–39 ribs on the penultimate whorl).................................................... 5

4b. Shell narrowly ribbed (58–80 ribs on the penultimate whorl).................................................. 6

5a. Shell height 2.45–2.8 mm; very widely ribbed (18–23 ribs on the penultimate whorl).............. D. halimunensis n. sp.

5b. Shell height 3.0– 3.25 mm; more narrowly ribbed (29–39 ribs on the penultimate whorl)............... D. kakenca n. sp.

6a. Shell height 3.2–3.45 mm; peristome broadly expanded.......................................... D. heteroglypha

6b. Shell height 2.65–3.2 mm; peristome little expanded................................................. D. javana

7a. Shell cylindrical or cylindrical-ovoid..................................................................... 8

7b. At least upper half of shell elongated conical, lower part narrowed or almost cylindrical........................... 10

8a. Shell finely and very closely ribbed (84–116 ribs on the penultimate whorl), 2.9–3.25 mm high............ D. cyclostoma

8b. Shell more coarsely and widely ribbed (35–76 ribs on the penultimate whorl), only small shells (shell height <2.5 mm) may be more closely ribbed (up to 87 ribs on the penultimate whorl).................................................. 9

9a. Shell cylindrical, umbilicus very narrow, but not covered by the reflected inner peristome, partly with a low parietal lamella visible in the aperture................................................................... D. heryantoi n. sp.

9b. Umbilicus at least partly covered by the reflected inner peristome, parietal lamella not visible in the aperture.. D. diplostoma

10a. Shell height smaller than 2.1 mm ....................................................................... 11

10b. Shell height larger than 2.1 mm ........................................................................ 12

11a. Shell distinctly ribbed, constriction of last whorl ventrolaterally right or ventrally, spiral palatal fold ventrally or ventrolaterally left...................................................................................... D. perpusilla

11b. Shell indistinctly ribbed, constriction of last whorl laterally right, spiral palatal fold ventrolaterally right... D. ristiae n. sp.

12a. Last 1.5 whorls much narrower than preceding whorl, peristome with distinct extensions, columellar lamella prominent in aperture........................................................................................... 13