Isometrus species, 1828

Sulakhe, Shauri, Deshpande, Shubhankar, Gowande, Gaurang, Dandekar, Nikhil & Ketkar, Makarand, 2022, Arboreal gems: resurrection of Isometrus sankeriensis Tikader & Bastawade, 1983 and descriptions of two new species of Isometrus Ehrenberg, 1828 (Scorpiones: Buthidae) from the Western Ghats, India, European Journal of Taxonomy 811 (1), pp. 1-50 : 44-45

Key to Isometrus species from India

1. Ventral median carina on vesicle strongly granular ..................... I. tamhini (Sulakhe et al., 2020)

– Ventral median carina on vesicle moderately granular....................................................................2

– Ventral median carina on vesicle weakly granular..........................................................................3

2. Surface of carapace coarsely and densely granular ................................. I. wayanadensis sp. nov.

– Surface of carapace finely and densely granular ......................... I. amboli (Sulakhe et al., 2020)

3. Chela length to width ratio in males 10.6 ...................................................... I. nakshatra sp. nov.

– Chela length to width ratio in males 5.0–6.4..................................................................................4

4. Lateral supramedian and ventral lateral carinae on metasomal segments II–IV strongly granular; metasomal length to carapace length ratio in males 5.9–6.1 ................................................................ ....................................................................................... I. sankeriensis ( Tikader & Bastawade, 1983)

– Lateral supramedian and ventral lateral carinae on metasomal segments II–IV moderately to weakly granular; metasomal length to carapace length ratio in males 6.5–8.2............................................5

5. Surface of carapace coarsely and sparsely granular, with some areas without granules; anterior margin of carapace sharply curved near lateral ocelli ........................ I. thurstoni (Pocock, 1983)

– Surface of carapace more closely granular in inter-ocular area and median posterior ocular area; anterior margin of carapace curved near lateral ocelli .................. I. kovariki (Sulakhe et al., 2020)