camaenidae

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Emerald Green Snail (Papustyla pulcherrima)

Also known as the Green Tree Snail or Manus Green Tree Snail, the emerald green snail is a species of terrestrial camaenid gastropod that is endemic to Manus Island in Papua New Guinea. Emerald green snails typically inhabit rain forests and are usually found in trees.

Although Papustyla pulcherrima is listed as Data Deficient by the IUCN it faces severe threats due to overharvesting for commercial purposes and habitat loss.

Classification

Animalia-Mollusca-Gastropoda-Heterobranchia-Euthyneura-Panpulmonata-Eupulmonata-Stylommatophora-Sigmurethra-Helicoidea-Camaenidae-Papustyla-P. pulcherrima

Images: Dennis Hill and Tim Ross

Land Snail - Amphidromus atricallosus perakensis

The arboreal land snails of the genus Amphidromus (Gastropoda - Camaenidae), are well known within Southeast Asia, particularly for their colourful shells and their curious dimorphic coiling (they can be dextral or sinistral, which means that the aperture of the shell is located on the right or left the longitudinal axis).

Amphidromus atricallosus perakensis is one of four recognized subspecies into one of two subgenera. This snail is also arboreal, and spends much of their time in scrubs or trees, though can sometimes be seen grazing on concrete structures. It is believed that these snails feed on microscopic flora such as fungal mats, lichens, or algae.

The shell is polished light yellow or sulphur-yellow, sometimes mixed with patches of white, although living specimens appear light mint green owing to the color of the animal’s body darkening the shell. 

This species has been recorded from Peninsular Malaysia and Singapore. However, a recent study has shown that the Singapore population is distinct.

References: [1] - [2] - [3]

Photo credit: ©Bernard Dupont (CC BY-NC-SA 2.0) | Locality: Taman Negara NP, Pahang, Malaysia (2013)

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Snail - Amphidromus sp. | ©Paul Bertner   (Mulu National Park, Borneo)

Amphidromus is a genus or arboreal pulmonate land snails belonging to the sigmurethran family Camaenidae (order Stylommatophora).

The shells of Amphidromus are relatively large, from 1-3 inches high, and colorful. One interesting fact of this genus is that has mixed dextral-sinistral populations (in reference to the direction -right or left- of rotation of the shell around its axis.

Sinistral mutants of normally dextral species and dextral mutants of normally sinistral species are rare but well documented occurrences among land snail. Populations or species with normally mixed coiling are much rarer, and confined to to a few genera of arboreal tropical snails. The independent appearance of this variation in unrelated groups is probably the result of a simple mutation [1].

Distribution of the genus Amphidromus include from eastern India in south-western Asia to northern Australia [2].

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Meridolum gulosum

…is a species of air-breathing terrestrial Camaenid gastropod mollusc which is endemic to Australia, where it is restricted to the rainforests and vine thickets of the Illawarra Escarpment, south of Sydney. Where it occurs from Bulli Pass south to Wollogong. Like most terrestrial gastropods M. gulosum is typically encountered among the leaf litter, and among fallen trees, rocks and bark.

Classification

Animalia-Mollusca-Gastropoda-Heterobranchia-Euthyneura-Panpulmonata-Eupulmonata-Stylommatophora-Sigmurethra-Helicoidea-Camaenidae-Meridolum-M. gulosum

Image: Peter Woodard