Gudeodiscus giardi

• Gudeodiscus giardi giardi (Fischer, 1898)
• Gudeodiscus giardi oharai Páll-Gergely, 2013[3]
• Gudeodiscus giardi szekeresi Páll-Gergely & Hunyadi, 2013[3]

The specific name giardi is in honor of French zoologist Alfred Mathieu Giard.[2] The subspecific name oharai is in honor of the collector Kenji Ohara.[3] The subspecific name szekeresi is in honor of the malacologist Miklós Szekeres.[3]

The distribution of Gudeodiscus giardi includes Cao Bằng Province and the northern part of Lạng Sơn Province in Vietnam[1] and western Guangxi in China.[3]

The type locality of Gudeodiscus giardi giardi is "Cao-Bang".[2][1] Gudeodiscus giardi giardi lives in Vietnam and China.[3] Gudeodiscus giardi oharai lives in are north of Nanning in Western Guangxi, China.[3] Gudeodiscus giardi szekeresi live in the type locality only: Langur Reserve, 25 km southeast of Chongzuo, China.[3]

The most important shell characters for identification of Gudeodiscus giardi include: high and rather sharply defined shell shape, narrow umbilicus (for the genus Gudeodiscus) and thick peristome.[1]

The size of the shell is small to large.[1] The shape of the shell is high and rather sharply defined.[1] The color of the shell is brownish, but some Chinese populations are small and yellow and translucent.[1] The sculpture is usually finely reticulated, that is resulting in a matt surface.[1] The umbilicus is deep.[1] Apertural lip, callus and apertural fold are very well-developed (callus is very much elevated).[1] Parietal wall has two lamellae.[1] The anterior lamella is usually connected to the lower plica.[1] Middle palatal plicae are short, depressed Z-shaped, or almost vertical, sometimes connected to each other.[1] The width of the shell 13.5–21.3 mm.[1] The height of the shell is 7.0–12.1 mm.[1]

The radula of Gudeodiscus giardi has 12 lateral teeth and 15 marginal teeth.[1] The size of the central tooth is as large as the ectocone of the first lateral.[1] The shape of the first lateral is rhomboid and pointed.[1] Marginal teeth are bicuspid or tricuspid with blunt inner cusp and shallow incision between the inner two cusps.[1]

The reproductive system of specimen from China was described by Páll-Gergely & Asami in 2014[4] and from Vietnam by Páll-Gergely et al. in 2015.[1] Embryos were not recorded in the uterus.[1] There were recorded hook-like or flat and oval calcareous granules on the internal surface of penis.[1]

It is a ground-dwelling species as all other plectopylid snails in Vietnam.[1]

It co-occur with other plectopylids in Vietnam: with Gudeodiscus anceyi, Gudeodiscus francoisi, Sicradiscus mansuyi and with Gudeodiscus suprafilaris.[1] Gudeodiscus phlyarius live at geographically close sites to Gudeodiscus giardi.[1]

This article incorporates Creative Commons (CC-BY-4.0) text from the reference[1]