COMPARATIVE BIOLOGY OF TWO JAPANESE FRESHWATER CRABS GEOTHELPHUSA EXIGUA AND G. DEHAANI (DECAPODA, BRACHYURA, POTAMIDAE)

Tomokazu Okano; Hiroshi Suzuki; Tomoyuki Miura

doi:10.1651/0278-0372(2000)020[0299:CBOTJF]2.0.CO;2

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Tomokazu Okano,¹ Hiroshi Suzuki,^1,2 Tomoyuki Miura³

¹Laboratory of Aquatic Resource Science, Faculty of Fisheries, Kagoshima University, 4–50–20 Shimoarata, Kagoshima 890–0056, Japan
²suzuki@fish.kagoshima-u.ac.jp
³United Graduate School of Agricultural Sciences, Kagoshima University, 21–24 Korimoto 1–Chome, Kagoshima 890–0065, Japan

Abstract

The Japanese freshwater crab Geothelphusa exigua Suzuki and Tsuda, 1994, is sympatric with Geothelphusa dehaani (White, 1874) in riverine habitats in Ohsumi Peninsula, Kagoshima Prefecture, southern Kyushu, Japan. We examined a number of biological characteristics of both crabs in two rivers in Ohsumi Peninsula to elucidate the factors maintaining their sympatric distribution. Results showed few biological differences between the two species, except for maximum body sizes and habitat preference. Geothelphusa exigua is smaller than G. dehaani in the maximum body size and lives mainly in water (aquatic), whereas G. dehaani may live both in water and on land (amphibious).

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Tomokazu Okano, Hiroshi Suzuki, and Tomoyuki Miura "COMPARATIVE BIOLOGY OF TWO JAPANESE FRESHWATER CRABS GEOTHELPHUSA EXIGUA AND G. DEHAANI (DECAPODA, BRACHYURA, POTAMIDAE)," Journal of Crustacean Biology 20(2), 299-308, (1 May 2000). https://doi.org/10.1651/0278-0372(2000)020[0299:CBOTJF]2.0.CO;2

Received: 22 April 1999; Accepted: 24 August 1999; Published: 1 May 2000

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