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Reproductive System of Male and Female Cockroach

In cockroach, sexes are separate, so dioecious

Zoology [Science]

Central Board of Secondary Education [12]

2/19/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Reproductive System of Cockroach - Male

  1. In cockroach, sexes are separate, so dioecious.

  2. Testes of cockroach are located in the abdominal segments 4, 5 and 6.

  3. Mushroom gland consists of two types of tubules, (a) the long slender tubules the utriculi majores of peripheral tubules and (b) short tubules, the utriculi breviores, making up of the major part of the gland.

  4. Small seminal vesicles are also found associated with mushroom gland.

  5. All sperms of a seminal vesicle are glued together into a large bundle called spermatophore.

  6. Spermatophore has three layered wall : inner layer secreted by utriculi majores; middle layer secreted by ejaculatory duct and outer layer secreted by phallic gland or conglobate gland.

  7. There are three asymmetrical chitinous structures called male ganopophytes or phallomeres. Right phellomere, left phallomere (largest) and ventral phellomere (smallest)

Reproductive System of Cockroach - Female

  1. Female organ consist of ovaries, oviduct, vagina, genital chamber, spermathecae, colleterial glands and female ganopophysis (ovipositor processes).

  2. Ovaries of cockroach are located in the abdominal segments 2 to 6. Each ovary consists of eight ovarioles.

  3. Two oviducts from each side open into a common oviduct or vagina which open into genutal chamber.

  4. A pair of collaterial glands also open in genital chamber.

  5. Genital pouch or gynatrium is divisible into a genital chamber in front and oothecal chamber behind.

  6. Female genitalia consists of 3 pairs of chitinous processes hanging from the roof of oothecal chamber into its cavity.

  7. Ootheca of cockroach contains sixteen fertilized eggs. Ootheca of cockroach is formed of a protein secreted by colleterial glands.

  8. Nymph of cockroach emerge out from ootheca. A nymph resembles to adult in general structure but lacks the wings and mature reproductive organs.

  9. Instar a large stage in the development of insects (larval instar, nymphal instar). Period between two moults in insects is termed stadium.

  10. In periplaneta americana the nymph grows by moulting about 13 times to reach the adult from blatta orientalis moults 6 times

  11. Metamorphosis is regulated by two hormones, ecdysone secreted by prothoracic glands and juvenile hormone secreted by corpora allata.

    Comparison of Periplaneta and Blatta
    Pariplaneta americana Blatta orientalis
    1. Size - larger
    2. Colour - shiny brown
    3. Wings - well developed
    4. Pronotum - narrower
    5. Saliva without invertase
    6. Chromosome number:
    Male 2n = 33
    Female 2n = 34
    1. Size - Smaller
    2. Colour - Dark brown
    3. Wings - In female, the tegmina are very short: hind wings absent
    4. Pronotum - broader
    5. Saliva with invertase
    6. Chromosome number:
    Male 2n = 47
    Female 2n = 48

2/19/2010Print This PageTell - A - FriendAdd to Wish ListReport Error

Related Words:

Reproductive System of Male Cockroach, Reproductive System of Female Cockroach, Mushroom Gland, Utriculi Majores, Peripheral Tubules, Utriculi Breviores, Seminal Vesicles, Spermatophore, Ejaculatory Duct, Phallic Gland, Conglobate Gland, Ganopophytes, Phallomeres, Collaterial Glands, Gynatrium, Genital Chamber, Oothecal Chamber, Nymph of Cockroach, Instar, Stadium, Comparison of Periplaneta And Blatta, Pariplaneta Americana, Blatta Orientalis, Chromosome Number




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