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.
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
Direct development is when the newborn offspring of a species is similar in most regards to the adult, according to Encyclopedia Britannica. The newborn is born or emerges from its egg as a miniature version of the adult. It looks like the adults of its species, and it also feeds like an adult of its species. The newborn differs from the adult only in minor details, especially size.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 >
During parakeet reproduction, the male stands on the back of the female, tucks his tail beneath hers, and rubs their cloaca together to stimulate ejaculation. This process fertilizes the eggs that the female lays.Full Answer >
The State University of New York states that animals reproduce by several sexual and asexual methods, with sexual reproduction, defined as the production of gametes with half of each parent's DNA and their union into diploid organisms, predominating. Sexual reproduction can be done externally, with eggs and sperm united outside an organism, or internally. Asexual reproduction takes a large number of forms, which vary between taxonomic groups.Full Answer >