Question: How many Phallomeres are present in cockroach?

External genitalia in the cockroach. Some chitinous asymmetrical structures are found surrounding the male gonopore at the end of the abdomen. These are three phallomeres or male gonapophyses which constitute the external genitalia.

How many segments are there in cockroach?

Although cockroaches actually have up to 20 segments, homologous with the segments of earthworms, some segments have become fused and are difficult to distinguish. Notice that appendages of the head (Fig. 4.2) and thorax (Figs. 4.3 and 4.4) are segmented.

What are the division of Chitinous exoskeleton of cockroach?

Answer: The body of cockroach is divided into three divisions as head, thorax and abdomen.

What is the role of Phallomeres?

Phallomere is a chitinous asymmetrical structure which acts as the external male genitalia which surrounds the male gonopore.

Is Phallomere present in female cockroach?

There are three gonapophysis that can be found in the female cockroach while the male cockroach has six gonapophyses.

Does a cockroach have 3 body parts?

Anatomy of a cockroach

Its body is divided into three segments: head, thorax and abdomen. Cockroaches have a long pair of antennae that help them to pick up smells and vibrations.

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What is the exoskeleton of cockroach called?

The exoskeleton of the head of the cockroach is known as epicranium. It consists of sex chitinous plates or sclerites. The addition of calcium carbonates to the chitin makes it tough. It helps in protection of the soft body. The shedding of the exoskeleton is known as moulting.

What is the function of Gonapophysis in cockroach?

Gonapophysis is an organ or process that serves in copulation, oviposition, or stinging of an insect’s anal region. In male cockroache gonapophysics, some asymmetric chitinous structures are discovered at the end of the abdomen surrounding the masculine gonopore.

How many eggs are present in an Ootheca of periplaneta?

About one week after mating the female produces an ootheca and at the peak of her reproductive period, she may form two oothecae per week (Bell and Adiyodi 1981). The females on average produce one egg case a month for ten months, laying 16 eggs per egg case.

Is Spermatheca found in male cockroach?

A) 6th abdominal segment of male. Hint: The spermatheca is an ectodermal organ responsible for receiving, maintaining, and releasing sperm to fertilize eggs. … The sperm which is collected can remain viable and alive inside the spermatheca for several years.

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