Macrochlamys amboinensis (von Martens, 1864) is a land snail from the family Ariophantidae. Its synonym is Tanychlamys amboinensis. This south-eastern Asian family has – among other ones – two interesting features: extended mantle called mantle collar and caudal horn on the tail.
I received few live snails named Tanychlamys amboinensis. I do not know the locality. I checked out everything about Tanychlamys amboinensis and found out that it is a synonym of Macrochlamys amboinensis (because recent malacologists use the name Macrochlamys). I can not be sure, that my snails are Macrochlamys amboinensis species surely, because I did not checked out all other Macrochlamys species, but the identification seems to be correct. I checked out all resources what I was able to find and I compiled the following overview of the history of research of this species:
This species was described by German malacologist and zoologist Eduard von Martens under the name Hyalina amboinensis in 1864. The type locality is “Mollukische Inseln der Amboinagruppe: Buru, Amboina und Banda-Nera”. The specific name amboinensis refer to the Ambon Island in Indonesia. It has been also spelled Amboyna, Amboina, and Amboine.
Von Martens did not depicted this new species in 1864, but he did it three years later, in 1867. Drawing of a shell of Macrochlamys amboinensis by von Martens (1867):
German malacologist Stefan Clessin classified this species as Hyalina (Polita) amboinensis in 1881.
American malacologist George Wahington Tryon classified this species as Zonites (Hyalinia) amboinensis within the family Zonitidae in 1886. The family Ariophantidae was established two years later, in 1888. Drawing of a shell of Macrochlamys amboinensis by G. W. Tryon (1886):
Dutch malacologist Woutera Sophie Suzanna van Benthem Jutting reported this species from the West Java. She firstly thought, that this species belong to the family Zonitidae and later she classified it as Tanychlamys amboinensis within family Helicarionidae in 1952. She reported only specimen in shell width of 12-13 mm. As of shell features and radula depiction I would recommend van Benthem Jutting’s description.
For distinguishing from other species this can help a bit: The last whorl is well-rounded. Apex of Macrochlamys amboinensis is rounded in comparison with other similar species in the genus.
Its distribution include Vietnam, and various islands in Indonesia, for example also Sumatra. It live in forests on limestone mountains in Vietnam. It lives from 700 m a. s. l. to more than 2958 m a. s. l in West Java. According to von Martens, it lives on the ground under moist leaves together with Stenogyra snails (family Subulinidae). Van Benthem Jutting also reported that is lives on the ground.
This snail has a shell width 18 mm and shell height 9 mm.
Another Macrochlamys amboinensis snail has a shell width 15 mm and shell height 8 mm.
Right side view:
There is visible a tentacle like extension of the mantle of the right side of the body on this right side view. It is called a lobe on mantle collar:
Another view of the mantle extension shows that this specimen has two lobes; on on the right side and one on the left side. The genus can have from one to four lobes on the mantle collar.
Caudal horn on the tip of the tail. The caudal horn is not always clearly visible on Macrochlamys amboinensis, but it can be seen quite good on this photo:
Top side view:
Four different views of the Macrochlamys amboinensis on my hand:
Macrochlamys amboinensis can be fed by vegetables in captivity. My snails normally consume leaves of lettuce (Lactuca sativa var. capitata).
If you will found out other resources on this species, let me to know. This species seems to be easy to keep in captivity, so hopefully some informations about its life cycle will be available in the future.
References (in chronological order)
(in Latin and in German) von Martens E. (1864). Über eine neue Art von Rochen, Trygonoptera javanica aus Batavia und über neue Heliceen aus dem indischen Archipel. Monatsberichte der Königlichen Preussische Akademie des Wissenschaften zu Berlin. 260-270, pages 266-267.
Clessin S. (1881). Nomenclator heliceorum viventium. Opus postumum Ludovici Pfeiffer. page 66.
Vermeulen J. J. (1996). Notes on terrestrial molluscs of Java, Bali and Nusa Penida. Basteria 59(4/6): 149-162.
Nhuong, D. V., & Dung, D. P. (2012). Data on land snails (Gastropoda) in Tay Trang area, Dien Bien province. TAP CHI SINH HOC, 34(4): 397-404.
Khac, H. N., Khac, H. N., & Anh, K. T. (2012). Preliminary data on lansnails (sic!) (Gastropoda) in Xom Du village, Xuan Son national park, Phu Tho province. TAP CHI SINH HOC, 32(1): 13-16.
Marwoto, R. (2017). Keong Darat dari Sumatera (Moluska, Gastropoda). ZOO INDONESIA, 25(1): 8-21.