Male cockroach
|
Female cockroach
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1. Larger in size
|
Smaller in size
|
2. Narrow abdomen
|
Broad abdomen
|
3. Anal styles present
|
Absent
|
4. Brood pouch absent
|
Present
|
5. Wings extend beyond the tip of abdomen
|
Wings extend up to abdomen
|
6. Testes and associated organs are present
|
Ovaries and associated organs are present
|
7. Chromosome number (2n)= 33
|
Chromosome number (2n) = 34
|
Vertebrates
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Invertebrates
|
1. Notochord is present in the embryo and vertebral column in the adult
|
Notochord and vertebral column are absent in embryo and adult
|
2. Gill slits are present
|
Absent
|
3. Nerve cord is single, hollow and non-ganglionated
|
Nerve cord is double, solid and ganglionated
|
4. Cranium is present
|
Absent
|
5. Post-anal tail is present
|
Absent
|
6. Two pairs of appendages for locomotion
|
Many pairs when present
|
7. Heart is ventral to the alimentary canal
|
Heart is dorsal to the alimentary canal
|
8. Blood flows forward ventrally and backward dorsally
|
Blood flows forward dorsally and backward ventrally
|
9. Haemoglobin is present in RBC
|
Haemoglobin if present is dissolved in plasma
|
10. Endoskeleton is present
|
Absent
|
