Isometrus Ehrenberg, 1828

Kovařík, František, Lowe, Graeme, Ranawana, Kithsiri B., Hoferek, David & Š, V. A., 2016, Scorpions of Sri Lanka (Scorpiones Buthidae, Chaerilidae, Scorpionidae) with description of four new species of the genera Charmus Karsch, 1879 and Reddyanus Vachon, 1972, stat n, Euscorpius 220, pp. 1-133 : 31-33

publication ID	https://doi.org/ 10.18590/euscorpius.2016.vol2016.iss220.1
DOI	https://doi.org/10.5281/zenodo.7124501
persistent identifier	https://treatment.plazi.org/id/B07187DF-A837-FFB2-FC1C-F9599AFCF8CC
treatment provided by	Felipe
scientific name	Isometrus Ehrenberg, 1828
status

Treatment

Isometrus Ehrenberg, 1828 View in CoL

( Figs. 13 View Figures 12–15 , 127–151 View Figures 127–130 View Figures 131–134 View Figures 135–137 View Figures 138–141 View Figures 142–145 View Figures 146–149 View Figures 150–151 , 196–197 View Figures 193–200 , 221–224 View Figures 209–224 , 237–244, 252– 253 View Figures 225–240 View Figures 241–259 , 403–406 View Figures 403–429 , 549– 555 View Figures 547–554 , 557– 560 View Figures 555–570 )

Buthus (Isometrus) Ehrenberg in Hemprich & Ehrenberg, 1828: pl. 1, fig. 3; Hemprich & Ehrenberg, 1829: 351.

Isometrus (Isometrus) : Vachon, 1972: 169–180, figs. 1– 13, 15, 17, 19; Vachon, 1982: 86–90, 100–101, 108, figs. 28–39, 64–65; Fet & Lowe, 2000: 146–150 (complete reference list until 1998); Kovařík, 2003: 2; Kovařík & Ojanguren, 2013: 182–184, 347, 353, 355–357, figs. 1251–1264, 1354–1357, 1368–1375, 1376–1385.

Isometrus View in CoL ( Raddyanus [sic]): Tikader & Bastawade, 1983: 254–311 (in part), figs. 771–840.

= Isometrus (Closotrichus) Tikader & Bastawade, 1983: 311–316 , figs. 896–910 (syn. by Kovařík, 1994: 201).

TYPE SPECIES. Scorpio maculatus De Geer, 1778 .

DIAGNOSIS. Medium sized buthids, adults 30–75 mm. Sternum type 1, triangular in shape. Pedipalps orthobothriotaxic, type Aβ. Chelal trichobothrium db located between dt and et. Three to five pairs of lateral eyes. Tibial spurs absent on all legs. Movable and fixed fingers of pedipalps with six rows of granules, several accessory granules and external and internal granules. Cheliceral fixed finger with a single ventral denticle. Third and fourth legs with tibial spurs. Tibia and tarsomeres of legs I–III with setae not arranged into bristle combs on dorsal surfaces. Tarsomeres II of leg IV with two rows of more than 30 dense setae. Mesosoma dorsally with one median carina. Telson with subaculear tooth pointed (except for Isometrus formosus Pocock, 1894 ). Pedipalp and metasomal segments longer in males than females.

COMMENTS. The taxonomic position of Isometrus formosus Pocock, 1894 from Indonesia is unclear. This species is probably not a member of the genus Isometrus , but comprises a separate genus. Two species of Isometrus , I. maculatus ( De Geer, 1778) and I. thwaitesi Pocock, 1897 are known from Sri Lanka. Pocock, 1900: 48, in remarks on the Indian species I. thurstoni Pocock, 1893 , wrote: "There are also two specimens in the British Museum labelled Ceylon ". However, as no other specimen of I. thurstoni has ever been recorded from Sri Lanka, we believe that I. thurstoni probably does not occur there.

DISTRIBUTION. Oriental region from India to Melanesia (see comments for I. maculatus ).