Arthropods reproduce by transferring sperm from the male to a female by way of sealed packets called spermatophores, according to the Encyclopedia Britannica. With few exceptions, arthropods are sexed as male or female, and both sexes have gonads, or sex organs, directly connected to ducts on the ventral surface of their trunks. The exact location of these ducts varies considerably amongst arthropod species.Continue Reading
During reproduction, sperm is not diluted with any other medium, according to Encyclopedia Britannica. In most arthropods, the spermatophore is left on the ground once reproduction occurs. After a nuptial dance, the male assists the female in positioning herself over the spermatophore to take it into the genital opening.
Fertilization in most arthropods results in the female laying eggs. In some arthropods, such as the scorpion, the eggs hatch inside the mother. She gives birth to live young and cares for her babies for an extended period, according to Wikipedia. Arthropods are all born at different stages of development ranging from fully formed miniature adults to grubs or caterpillars. When arthropods are born as grubs or caterpillars, they undergo metamorphosis, a period of inactivity where larval tissues are broken down and re-used to help build the adult body.Learn more about Animal Reproduction
The process of sexual reproduction for cod involves the act of spawning, resulting in the egg and sperm coming together for fertilization in open water. The male and female swim as a pair in circles during the spawning process.Full Answer >
Platyhelminthes, also known as flatworms, are hermaphrodites, meaning individuals of the species produce both sperm and eggs. These are released from the platyhelminthes where they become cross-fertilized by other platyhelminthes. Two types of platyhelminthes, trematoda and cestoda, lay eggs constantly. The turbellarian class has a seasonal cycle. Turbellaria also reproduce asexually by dividing. Turbellaria are the only class able to regenerate body parts.Full Answer >
Disadvantages of external fertilization include a reliance on water and the large amount of wasted sperm and eggs that never reach a corresponding gamete, even when the organisms releasing the eggs and sperm are in close proximity. Additionally, the eggs released can have no shells, as these would stop sperm.Full Answer >
Mammals reproduce sexually, via the union of sperm and egg cells. Except for five species of egg-laying mammals, called monotremes, all mammals give birth to live young.Full Answer >