Isometrus maculatus

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Lesser brown scorpion
Isometrus maculatus - National Museum of Nature and Science, Tokyo - DSC06799.JPG
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Scorpiones
Family: Buthidae
Genus: Isometrus
Species:
I. maculatus
Binomial name
Isometrus maculatus
(De Geer, 1778 [1] )
Synonyms
  • Scorpio maculatusDe Geer, 1778
  • Isometrus maculatusKraepelin, 1899
  • Isometrus (Isometrus) maculatusVachon, 1972

Isometrus maculatus, commonly as the lesser brown scorpion, is a species of scorpion in the family Buthidae. [2] Its distribution is pantropical; it is an introduced species in Hawaii. [2]

Contents

Description

Total length is about 30 to 75 mm. Manus of pedipalp is very thin, whereas in males, its width equals that of patella and femur. Pedipalps and legs are yellow, with spots. Manus of pedipalps is yellow with many spots, but fingers are dark. Mesosomal segments are light colored. Basal middle lamella of female pecten is quadrangular shaped. Posterior margin of sternite V is straight in females, which is very slightly convex medially in males. There are 15 to 20 pectinal teeth, but Sri Lankan specimens recorded 17 to 20 pectinal teeth. [3] Sexual dimorphism is visible after the last molt. Identification of immature males and females is difficult, but can be separated by observing pectines. Pectines are longer and larger in males than in females. Also, male pectines have more teeth than female pectines. [4]

The duration of embryonic development ranges from 2.2 to 3.2 months. After a single insemination, adult female can gives birth to from three to five broods in captivity. Average littler size for a brood ranges from 14 to 21 juveniles. Young scorpions remain with their mother until their first molt. After the first moult, they start to disperse. The first molt took place about 5 days after the birth. Subsequent molts usually take place at different ages, on average 46, 78, 111 and 155 days. The duration of postembryonic development ranges from 4.5 to 5.6 months. Adult lifespan is about 24 to 35 months. [4]

The venom of Isometrus maculatus contains the toxins ImKTX58 and ImKTx88.

See also

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References

  1. ↑ De Geer, 1778 : Mémoires pour servir à l'histoire des Insectes: bibliothèque du muséum d'histoire naturelle cinquième mémoire. Des scorpions et fauxscorpions. Stockholm, vol. 7, p. 325-350
  2. 1 2 Julian R. Yates III (1993). "Isometrus maculatus (De Geer)". Urban Knowledge Master, EXTension ENTOmology & UH-CTAHR Integrated Pest Management Program. University of Hawaii. Retrieved 17 July 2016.
  3. ↑ Charles University; Kovařík, František; Lowe, Graeme; Monell Chemical Senses Center; Ranawana, Kithsiri B.; University of Peradeniya; Hoferek, David; Jayarathne, V. A. Sanjeewa; University of Peradeniya (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. pp. 1–133. doi:10.18590/euscorpius.2016.vol2016.iss220.1 . Retrieved 2021-08-29.
  4. 1 2 "Notes on the postembryonic development of two species of Isometrus Ehrenberg (Scorpiones, Buthidae) from Sri Lanka" (PDF). zobodat. Retrieved 2021-08-31.
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