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| Tiwaripotamon hamyen
Do, Nguyen & Dang, 2017
RAFFLES BULLETIN OF ZOOLOGY. 65
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Abstract
Two new terrestrial crab species of the family Potamidae, Tiwaripotamon xuanson and T. hamyen, are
described from northern Vietnam. Tiwaripotamon xuanson was collected from Xuan Son National Park, Thanh
Son district, Phu Tho province, and T. hamyen was found in Binh Xa commune, Ham Yen district, Tuyen Quang
province. They can be distinguished from other congeners by distinct carapace characteristics and gonopod 1 structures.
Key words. Tiwaripotamon xuanson, Tiwaripotamon hamyen, taxonomy
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| Fig. 8. Tiwaripotamon hamyen, new species, with differences living colour in carapace and ambulatory legs. |
TAXONOMY
Family Potamidae Ortmann, 1896
Subfamily Potamiscinae Ortmann, 1896 (sensu Yeo & Ng, 2004)
Genus Tiwaripotamon Bott, 1970
Type species: Geothelphusa annamensis Balss, 1914, by original designation
Tiwaripotamon xuanson, new species
Etymology. The new species is named after the type locality,
Xuan Son National Park. The name is used as a noun in
apposition.
Live colouration. Carapace reddish, chela and ambulatory
legs red.
Ecological notes. This species inhabits limestone mountains
far from water bodies, on the forest floor. One specimen was
found in a fallen dead tree (Fig. 5). The other specimens
were found in rock cavities and under leaf litter.
Tiwaripotamon hamyen, new species
Etymology. The new species is named after the type locality,
Ham Yen. The name is used as a noun in apposition.
Live colouration. Carapace and chela milky to light gray,
ambulatory legs vary from milky to light gray or purple
mixed light orange (Fig. 8A–D).
Ecological notes. This species inhabits limestone mountains.
Our observation of this species and other Tiwaripotamon
species from Vietnam confirm that they have terrestrial
habits. They were often found far from water sources like
streams and ponds. We observed a female T. edostilus
carrying juveniles walking on the forest floor not close to
any water body. It means these juveniles did not develop
in streams or ponds.
Van Tu Do, Tong Cuong Nguyen and Van Dong Dang. 2017. Two New Species of Freshwater Crabs of the Genus Tiwaripotamon Bott, 1970 (Crustacea, Decapoda, Brachyura, Potamidae) from northern Vietnam. RAFFLES BULLETIN OF ZOOLOGY. 65; 455–465. lkcnhm.nus.edu.sg/nus/images/data/raffles_bulletin_of_zoology/vol65/65rbz455-465.pdf
