How can you say that cockrock exhibits sexual dimorphism ?

Dear student

Please refer the solution below for the said query


The cockroach shows sexual dimorphism, i.e there is marked difference in appearance between male and female cockroach.  This can be understood by following points.

 

In females:
 

  • The female is larger.
  • 7th sternum; boat-shaped
  • The 7th, 8th and 9th sterna form the genital pouch (brood).
  • Anterior part of genital pouch contains gonopore, spermathecal pores and collateral glands
  • Anal styles is absent

In males:
 
  • The male is smaller. 
  • Genital pouch lies at the hind part of the abdomen
  • Genital pouch is bounded dorsally by the 9th and 10th terga, and ventrally by the 9th sternum.
  • Genital pouch contains dorsal anus, ventral male genital pore and gonapophysis.​ 
  • Bear a pair of short, thread-like anal styles 


Hope this information clears your doubt about the topic.

Regards

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