Isometrus maculatus

Deshpande, Shubhankar, Gowande, Gaurang, Bastawade, Deshabhushan & Sulakhe, Shauri, 2022, A new species of Isometrus Ehrenberg, 1828 (Scorpiones: Buthidae) from southeastern plains of Tamil Nadu, India, Euscorpius 353, pp. 1-19 : 14

(excluding I. maculatus )

1. Telson vesicle length to depth ratio in males 3.5–3.7 ........ ............................................................ I. longitelson sp. n.

- Telson vesicle length to depth ratio in males 2.0–2.8 ..... 2

2. Ventral median carina on vesicle strongly granular ...........

........................................... I. tamhini Sulakhe et al., 2020 - Ventral median carina on vesicle moderately granular ... 3 - Ventral median carina on vesicle weakly granular .......... 4

3. Surface of carapace coarsely and densely granular ............ ................................. I. wayanadensis Sulakhe et al., 2022

- Surface of carapace finely and densely granular ................ ............................................. I. amboli Sulakhe et al., 2020

4. Chela length to width ratio in males 10 ............................. ........................................ I. nakshatra Sulakhe et al., 2022

- Chela length to width ratio in males 5.0–6.4 .................. 5

5. 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 .................................................................................... 6

6 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