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Gudeodiscus messageri
Gudeodiscus messageri is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Plectopylidae. SubspeciesGudeodiscus messageri include two subspecies:
Distribution The distribution of Gudeodiscus messageri messageri is known from Vietnam along the Chinese border (Yunnan Province).[2] The distribution of Gudeodiscus messageri raheemi is known from Vietnam from Ninh Bình Province, Thanh Hóa Province, Sơn La Province, Hòa Bình Province and Nghệ An Province[2] and from Luang Prabang Province in north Laos and Vientiane Province in northwest Laos.[3] Gudeodiscus messageri raheemi in Laos is the westernmost record of the genus Gudeodiscus.[3] DescriptionThe shell of Gudeodiscus messageri is small to medium-sized, with slightly elevated spire.[2] The dorsal surface is somewhat domed.[2] The aperture is almost circular.[2] The apertural fold is missing.[2] Callus is rather blunt and only slightly curved.[2] Parietal wall has two lamellae (the anterior lamella may be dissolved into small denticles).[2] Lower parietal plica is free or connected to the anterior lamella.[2] Palatal plicae are oblique, or depressed Z-shaped, usually in contact with each other.[2] Gudeodiscus messageri messageriThe most important shell characters for identification of Gudeodiscus messageri messageri include: slightly elevated spire, callus is not angled in the middle, apertural fold is always missing.[2] Other characteristics include: anterior lamella is normal (it is not dissolved into small denticles).[2] Lower parietal plica does not extend beyond the anterior lamella in the anterior direction.[2] The width of the shell is 12.75–18.5 mm.[2] Views of the shell of Gudeodiscus messageri messageri by Gerard Pierre Laurent Kalshoven Gude:
Gudeodiscus messageri raheemiThe most important shell characters for identification of Gudeodiscus messageri raheemi include: body whorl is less shouldered than that of the nominotypical subspecies, but plicae have to be observed for correct identification.[2] Views of the shell of Gudeodiscus messageri raheemi:
 The radula of Gudeodiscus messageri raheemi has 8 lateral teeth and 16 marginal teeth.[2] The size of the central tooth is as large as or larger than the ectocone of the first lateral.[2] The shape of the first lateral is rhomboid and pointed.[2] Marginal teeth are tricuspid with rather sharp inner cusp and deep incision between the cusps.[2] Embryos were recorded to be present in the uterus.[2] There were not recorded calcareous granules on the internal surface of penis.[2] Ecology It is a ground-dwelling species as all other plectopylid snails in Vietnam.[2] It lives in primary forests and in old secondary broad-leaved forests.[3] It can be found in the humid microenvironments under leaves, logs, limestone rocks and in black soil accumulated inside limestone pockets.[3] It co-occur with other plectopylids in Vietnam: with Gudeodiscus phlyarius and with Gudeodiscus hemmeni.[2] It also co-occur with clausiliid Garnieria mouhoti, that is also associated with the moderate humidity of broad-leaved forests.[3] ReferencesThis article incorporates Creative Commons (CC-BY-4.0) text from the references[2][3]
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