Isolapotamon anomalum (Chace, 1938)

Brandis, Dirk, 2002, On the taxonomic status and biogeography of the Isolapotamidae Bott, 1970 (Decapoda, Brachyura), Journal of Natural History 36 (11), pp. 1291-1339 : 1302

Isolapotamon anomalum (Chace, 1938)

(gure 5a–c)

Potamon anomalum Chace, 1938: 14 , pl. 2.

Isolapotamon (Isolapotamon) anomalum: Bott, 1968: 120 , gure 1.

Isolapotamon anomalum: Bott, 1970b: 191 , pl. 41, gure 77, pl. 56, gure 82; Ng and Tan, 1998: 56, gure 1A–D.

Material. One, one (juv.) ( NMB 944 a) Bundutuan , Luidan river, Kina-Balu, North Borneo , 3000 feet, exch. Cambridge; one ( SMF 2839 ) Luidan river , Kinabalu, North Borneo .

Diagnosis. Distal part of terminal joint of rst gonopod with a dorsoventrally attened, broadened terminal projection that is distinctly separated from the cone-like gonopodial opening.

Type locality. Bundutan , Luidan river, Mt Kinabalu, North Borneo .

Distribution. North Borneo, in the Luidan river at the Mount Kinabalu.

Measurements. 35.7: 26.9: 17.2: 8.8 ( SMF 2839).

Remarks. Isolapotamon anomalum is one of a number of species of this genus in the Kinabalu area, which were revised by Ng and Tan (1998). Within these species Isolapotamon anomalum most closely resembles I. griswoldi (Chace, 1938) based on the shape of the distal part of the rst gonopod. In both species the distal extension of gonopod 1 is distinctly separate from the gonopodial cone-like opening but this distal extension is rounded and more or less thorn-like in I. griswoldi while it is broad and dorsoventrally attened in I. anomalum .