Journal of Entomology and Zoology Studies

 

Volume 2, Issue 2

 

A new cytological record of two scarab beetle species from the genus Gymnopleurus Illiger, 1803 (Coleoptera: Scarabaeidae)

Author(s): Paramjeet Kaur, Abhay Singh Yadav

Abstract: Karyological investigations on two Gymnopleurus spp.; Gymnopleurus miliaris (F.) and Gymnopleurus parvus (MacL.) are under taken in the present study. Meioformula of G. miliaris (17AA+Xyp) and G. parvus (8AA+Xyp) are presented. None of these beetles exhibited a modal polyphagan karyotype. However, Xyp was found to be the male sex chromosome mechanism. Most chromosomes are acro and subtelocentric. Change in the number and size of chromosomes in the karyotypes is suggestive of the Robertsonian fusion having played some role in the evolution of karyotype in this genus. The evolutionary trends in Gymnopleurus have been discussed.

Related graphics:

spermatogonial metaphase
Fig: 1a,b G. miliaris; 1c,d: G parvus. a&c: spermatogonial metaphase; b&d: karyotypes.

Metaphase I
Figs 2-4. G. miliaris Fig. 2. Metaphase I, arrow shows Xyp; Fig 3. Spermatogonial anaphase I; Fig. 4. Metaphase II; Figs. 5-7 G.parvus Fig. 5. Diplotene stage; Fig. 6. Metaphase I, arrow indicates Xyp; Fig. 7. Metaphase II.

Download Full Article : Click Here

 

Advertisement:Mosquito Journal