Activity

TMEN513 Lab exam: Cockroaches and bugs
Mr. Vanheuang Phommadeechack ID:6436660

Question1: Please describe how you identify the cockroaches (selecting at least two species)
Answers: We can use morphology characteristics to describe cockroaches species as some species below:
– Periplaneta americana (American cockroach): it is a group of large size cockroaches. They have wings that covers all the abdomen and there are some pale areas on the pronotum. Both male and female cercus, last segment is twice as long as wild, whilst in male there are stylets presented.
– Periplaneta australasiae (Australian cockroach): it is also a group of large size cockroaches and the morphology is quite the same with American cockroach but the pronotum is ringed with similar coloration, one special characteristic of Australian cockroach is that there are pale lateral markings on the upper edges of tegmina wings on both sides.
– Supella longipalpa (Brown-banded cockroach): it is a group of small size cockroaches, there are two transverse dark bands on wings. In females, wings are shorter than abdomen. Whereas, in male wings are longer than abdomen

Question2: What is the difference between genus Triatoma and Rhodnius?
Answers: Triatoma spp. and Rhodnius spp. are tiatomine bugs (kissing bugs) in the family of Reduviidae and subfamily of Triatominea. It can be the vector of Trypanosoma cruzi, which is the agent that causeed Chagas’ disease. The difference between genus Triatoma and Rhodnius genus is piercing-sucking mouthpart position, as we can see that Triatoma specie the antennae arise from side of head at the middle in the between eye and the tip, but in the Rhodnius spp. antennae arise from sides of the head at the anterior end. The rest other morphology characteristics of both Triatoma and Rhodnius is quite the same, it has a cone-shaped head on a narrow neck and an abdomen that is widened in the middle, the front wings are hemelytra type.

Note: The scientific name cannot write in italic in the comment.