Ganesella perakensis (Crosse, 1879)

Sutcharit, Chirasak, Thach, Phanara, Chhuoy, Samol, Ngor, Peng Bun, Jeratthitikul, Ekgachai, Siriwut, Warut, Srisonchai, Ruttapon, Ng, Ting Hui, Pholyotha, Arthit, Jirapatrasilp, Parin & Panha, Somsak, 2020, Annotated checklist of the land snail fauna from southern Cambodia (Mollusca, Gastropoda), ZooKeys 948, pp. 1-46 : 1

publication ID

https://dx.doi.org/10.3897/zookeys.948.51671

publication LSID

lsid:zoobank.org:pub:20E7C613-5771-4F32-8F6C-44A7E84AFA68

persistent identifier

https://treatment.plazi.org/id/CC0F820D-5140-5F03-8B7B-20ADBBD3E1F4

treatment provided by

ZooKeys by Pensoft

scientific name

Ganesella perakensis (Crosse, 1879)
status

 

Ganesella perakensis (Crosse, 1879) Figs 5C View Figure 5 , 12A View Figure 12

Helix (Geotrochus) perakensis Crosse, 1879: 199, 200, pl. 8, fig. 4. Type locality: Perak [Perak State, Malaysia].

Ganesella perakensis : Richardson 1985: 130. Sutcharit et al. 2019a: fig. 4d.

Material examined.

Locality no. 15: CUMZ-CM159 (3 shells; Fig. 12A View Figure 12 ), CUMZ-CM160 (2 shells), CUMZ-CM161 (3 specimens in ethanol; Fig. 5C View Figure 5 ). The snails were found to live on tree trunks and leaves.

Distribution.

Peninsula Malaysia ( Sutcharit et al. 2019a).

Remarks.

This species was originally described from Perak, Peninsula Malaysia, and a syntype was recently figured in Sutcharit et al. (2019a: fig. 4d). Characteristics of this species are its small shell size and trochoid shape. The whorls are slightly convex, with wide and shallow suture. The shell surface exhibits thin growth lines and thin corneous periostracum. The last whorl is with well-developed peripheral keel and blunt at lower periphery. The shell colour is pale yellow to brownish, with dark brown spiral bands on peripheral keel. The apertural lip is expanded, whitish, and angled.

Ganesella perakensis belongs to the G. acris (Benson, 1859) species complex which is composed of 11 nominal species and widely distributed from Western Ghats of India to Indochina and the Greater Sunda Islands (see Richardson 1985: 129, 130). However, G. perakensis differs from all species known in Indochina. It differs from G. subperakensis (Pilsbry, 1891) from “Tonquin” and G. vatheleti (Bavay & Dautzenberg, 1899) from "Van Bu, Tonkin" by having a strong peripheral keel. For comparison, G. subperakensis is convex below periphery, with less strong peripheral keel and without brownish spiral band ( Pilsbry 1891), while G. vatheleti exhibits a round last whorl and is more convex at base ( Bavay and Dautzenberg 1899).

This species is very similar to G. lantenoisi (Dautzenberg & Fischer, 1906), which was described from Ha-Giang (Northern Vietnam) and Siam [Thailand]. The description itself was based mainly on the Ha-Giang specimen ( Dautzenberg and Fischer 1906: pl. 9, fig. 10) while the Siamese specimen ( Dautzenberg and Fischer 1906: pl. 9, fig. 11) is more similar to G. perakensis . Thus, the type series of this species seems to comprise of two separate species, one from northern Vietnam and one from Thailand. Ganesella perakensis differs from G. lantenoisi (specimen from Ha-Giang) in having a smaller shell (shell height up to 13 mm), shallow suture with 6 to 7 convex whorls, while G. lantenoisi performs an elongate trochoid, larger shell (shell height up to 18 mm), suture flattened and smooth 9 to 10 whorls. However, further investigations with both genitalia and DNA analysis will be necessary to elucidate the exact relationship between them.

Kingdom

Animalia

Phylum

Mollusca

Class

Gastropoda

Order

Stylommatophora

Family

Camaenidae

Genus

Ganesella

Loc

Ganesella perakensis (Crosse, 1879)

Sutcharit, Chirasak, Thach, Phanara, Chhuoy, Samol, Ngor, Peng Bun, Jeratthitikul, Ekgachai, Siriwut, Warut, Srisonchai, Ruttapon, Ng, Ting Hui, Pholyotha, Arthit, Jirapatrasilp, Parin & Panha, Somsak 2020
2020
Loc

Helix (Geotrochus) perakensis

Crosse 1879
1879