Morphometry of mountain crabs (Crustacea: Decapoda: Brachyura: Potamidae) from Phetchabun Mountains Thailand
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Abstract
Mountain crabs are freshwater crabs which live in high mountain streams. They are an important food source for local villagers, but some species are threatened with extinction. The aims of this study was to collect and identify mountain crabs of family Potamidae using external morphology, and morphometric analysis. A total of 138 crabs (103 males and 35 females) were collected from 15 locations of the Phetchabun Mountains (310 to 845 meters above sea level). The morphological crab was classified based on gonopod and other characters. This study identified six species: Indochinamon bhumibol, Indochinamon ahkense, Indochinamon mieni, Iomon nan, Vietopotamon phuluangense and Larnaudia chaiyaphumi. All species showed relationship between the carapace width and weight, indicating that they maintain the same shape throughout life, making identification more difficult. The variety of morphological characteristics presents a challenge in the identification. I. bhumibol's the first gonopod is extreme like other species and has high variation coloration. Therefore, taxonomists need to search for other characters and techniques for classification. It is suggested that species of crabs facing extinction be selectively propagated incapacity for release back into the wild.
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