RABBIT |
FROG |
1. Sexual dimorphism is well marked due to presence of penis and scrotal sacs containing tests only in male. |
1. Not distinct. However, in male frog, base of first inner finger forms a thick nuptial pad during breeding season to clasp female in amplexus. Vocal sacs present in males. |
2. Include 2 testes,2 epididymes, 2vasa deferentia, urethra, penis and some accessory glands. |
2. Include two testes, several vasa efferentia, bidders canal two urinogenital ductsand cloaca. |
3. Small, oval, white bodies. Remain inside abdominal cavity in young. But descend from abdomen in to scrotal sacs during breeding season in adult. |
3. Ovoid or rod-like, light yellow, attached to anteroventral surface of kidneys by mesorchium. |
4. Rectal gland present. |
4. Rectal gland absent. |
5. Each testes attached by anterior end to dorsal abdominal wall by a spermatic cord and by posterior end to wall of scrotal sac by gubernaculum. |
5. Absent. |
6. Epididymis well developed and has 3 distinct parts, caput, cauda and corpus epididymes attached to the anterior, posterior and inner sides, respectively, of testis. |
6. Vas deferens does not form an epididymis. |
7. Two vasa deferentia, arising from cauda epididymis of their side, open into neck of urinary bladder or urethra. |
7. Each vas dererens unites with ureter of its side forming a urinogenital duct, opening separately into roof of cloaca. |
8. Small, slightly bifurcated blind sac, called uterus masculinus or seminal vesicle opens dorsally and independently into urethra. |
8. In some species of frog, terminal part of urinogenital duct enlarges forming a temporary seminal vesicle. |
9. It includes small erectile cylindrical penis in front of anus of male. It serves to transmit sperms into vagina of female during copulaiton. |
9. Copulatory apparatus absent. Fertilization external, inwater, where ova and spermatozoa are shed during amplexus. |
10. Male has one pair of prostate, Cowper's, perenial and rectal glands. Their secretions either attract the female or contribute to semen. |
10. Do not occur. |