Offspring growth and development in two buthid scorpions from Azerbaijan

Growth and biological development in scorpions vary between species and their habitat, climate and feeding ecology. Nizami E. Novruzov has recently published a laboratory study of the above in the two buthid species Olivierus caucasicus (Nordmann, 1840) and Mesobuthus eupeus (C.L. Koch, 1839) from Azerbaijan. See abstract and article for details.

Abstract:
The main aspects of offspring growth in two scorpion species – Mesobuthus eupeus and Olivierus caucasicus were studied. The entire reproductive cycle – mating, pregnancy of females, birth of the offspring and their growth until adulthood – took place in laboratory conditions. The duration, rate, and intensity of growth, as well as the dynamics of body weight changes and some metric traits during post-embryonic ontogenesis were studied. The growth of young scorpions was uneven, with growth periods of varying lengths: from larva to third molt – an average of 6.2 months, from the fourth molt to the sixth (imago) – an average of 12.6 months (M. eupeus); and an average of 7.7 and 14.1 months (O. caucasicus). By duration of development, M. eupeus nymphs were ahead of O. caucasicus nymphs: on average by 9.2±2.8 days in early post-larval ontogenesis and by 15.0±3.5 days in late post larval ontogenesis. Of the entire growth cycle, 4/5 occurred during molting, the remaining 1/5 occurred in the periods between molting. Species-specific and sex-specific differences in the dynamics of changes in linear characters and body weight were identified. Sexual dimorphism was also evident in faster development, a greater number of molts, and a longer lifespan in females compared to males. Changes in growth rate and intensity tended to increase at the beginning of development and decrease at the end. Nymphs of both species also showed some decrease in growth rate and weight gain during periods of no feeding activity before molting and during periods chronologically corresponding to their natural diapause in the wild.

Reference:
Novruzov NE. Comparative dynamics of offspring growth in Mesobuthus eupeus (C.L. Koch, 1839) and Olivierus caucasicus (Nordmann, 1840) (Scorpiones: Buthidae). Serket. 2026;21(2):158–74. [Open Access]

Thanks to Hisham El-Hennaway for sending me the article!