Isometrus melanodactylus, photographed by azn4114.

Belongs within: Buthoidea.

Isometrus is a genus of scorpions found primarily in the Old World tropics, except for the pantropical I. maculatus.

See also: The world's scorpion.

Characters (from Kovařík 2003): Trichobothrial patterns orthobothriotaxic. Dorsal trichobothria of femur arranged in beta-configuration. Tibial spurs absent on all legs. Sternum subtriangular. Movable fingers of pedipalps with six rows of granules and external and internal granules. Tibiae and tarsomeres of legs I–III with setae not arranged into bristlecombs. Carapace granulated, without carinae. Mesosoma dorsally with one median carina. Telson with subaculear tooth pointed or rounded. Total length under 70 mm.

Isometrus Hemprich & Ehrenberg 1829 K92
    |--I. antillanus T89
    |--I. atomarius T89
    |--I. feae Thorell 1889 T89
    |--I. fuscus T89
    |--I. maculatus (De Geer 1778) K92 (see below for synonymy)
    |--I. melanodactylus (Koch 1867) [incl. I. papuensis Werner 1916] J98
    |--I. melanophysa (Koch 1867) [=Lychas melanophysa; incl. I. gracilis Thorell 1876] KK84
    |--I. perfidus Koch & Keyserling 1884-1885 KK84
    |--I. phipsoni T89
    |--I. scutilus [=Lychas scutilus] T89
    |--I. shoplandii Oates 1888 T89
    |--I. thorellii Koch & Keyserling 1884-1885 KK84
    `--I. variatus Thorell 1876 KK84

Isometrus maculatus (De Geer 1778) K92 [=Scorpio maculatus K92, Lychas maculatus KK84; incl. Lychas americanus Koch 1845 KK84, Centrurus (Isometrus) americanus KK84, Scorpio dentatus Herbst 1800 KK84, Buthus (Isometrus) filum Hemprich & Ehrenberg 1829 KK84, S. (Atreus) filum KK84, S. (Lichas) gabonensis Lucas 1858 KK84, S. guineensis Lucas 1858 KK84]

*Type species of generic name indicated


[J98] Jäger, P. 1998. Das Typenmaterial der Spinnentiere (Arachnida: Acari, Amblypygi, Araneae, Opiliones, Pseudoscorpiones, Scorpiones, Uropygi) aus dem Museum Wiesbaden. Jahrbuecher des Nassauischen Vereins fuer Naturkunde 119: 81-91.

[K92] Karsch, F. 1892. Arachniden von Ceylon und von Minikoy gesammelt von den Herren Doctoren P. und F. Sarasin. Berliner Entomologische Zeitschrift 36 (2): 267-310.

[KK84] Koch, L., & E. Keyserling. 1884-1890. Die Arachniden Australiens nach der Natur beschrieben und abgebildet vol. 2. Bauer & Raspe: Nürnberg.

Kovařík, F. 2003. A review of the genus Isometrus Ehrenberg, 1828 (Scorpiones: Buthidae) with descriptions of four new species from Asia and Australia. Euscorpius 10: 1-19.

[T89] Thorell, T. 1889. Viaggio di Leonardo Fea in Birmania e regioni vicine. XXI. – Aracnidi Artrogastri Birmani raccolti da L. Fea nel 1885-1887. Annali del Museo Civico di Storia Naturale di Genova, Serie 2a 7: 521-729.

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