A new semiterrestrial freshwater crab in the genus Badistemon and a new record of Indochinamon from northern Thailand (Brachyura: Potamidae) Author Rogers, D. Christopher Author Sanoamuang, Laorsri Author Sanoamuang, Niwat text Raffles Bulletin of Zoology 2021 2021-12-27 69 548 554 journal article 10.26107/RBZ-2021-0071 2345-7600 7174873 23D50815-D635-4C4F-82D2-3570B938AC92 Indochinamon bhumibol ( Naiyanetr, 2001 ) Pu Chao Pho Luang, Giant Mountain Crab ( Figs. 2A–E , 3 ) Material examined. THAILAND : Nan Province , Chiang Klang District , Ban Nam Meed Stream , 19°20′3″N , 100°50′3″E , ~ 400 m asl ; 4 males , 1 female ; August 2018 ; N. Sanoamuang . Remarks. Five specimens ( one female , four males ) of Indochinamon bhumibol were collected at the same site as B. nanensis , new species , described above. As with B. nanensis , new species , I. bhumibol is nocturnal and burrows under large stones along the stream banks. The local people capture them for food using chicken meat. The largest specimen was a male with a carapace length of 51.6 mm and carapace width of 68.4 mm . Our material fits within the size range presented in the original description, and the form of gonopods I and II ( Fig. 1D, E ), maxilliped III ( Fig. 1B ), as well as the habitat and colouration in life ( Fig. 2A, B ) match the original description very well ( Naiyanetr, 2001 ). However, some minor differences are evident. In our material, the carapace dorsolateral rugosities appear to be slightly larger, the orbital and epibranchial teeth slightly more prominent, and the orbital tooth bears a weak marginal bead ( Figs. 1A , 2B, D ). The telson lateral margins are more convex in two of the four males ( Fig. 1C ). This new record represents a significant range extension. Our locality is approximately 350 km north of the type locality in Loei province ( Naiyanetr, 2001 ), and is situated in a different drainage system .