Search results
Results from the WOW.Com Content Network
A few species exhibit pseudogamous parthogenesis, meaning that mating is necessary to stimulate reproduction, even though no male genetic material passes to the offspring. [37] Earthworm mating occurs on the surface, most often at night. Earthworms are hermaphrodites; that is, they have both male and female sexual organs. The sexual organs are ...
Fertilization takes place in the cocoon and the cocoon is deposited in a small chamber in the soil adjacent to the parental burrow. After a few weeks, young worms emerge and begin to feed in the soil. In the early juvenile phase, the worms do not develop the vertical burrows typical of adults.
Fecundity, growth, maturation and biomass production were all significantly greater at 25 °C than 15°, 20°or 30°. {25 °C = 77 °F} The growth of individual earthworms increases as the population density lowers, but the greatest overall earthworm biomass production occurs at the highest population density.
Both worms may secrete cocoons that contain an egg each. These cocoons are lemon-shaped and are pale yellow at first, becoming more brownish as the worms inside become mature. These cocoons are clearly visible to the naked eye. Statistics. From egg to sexual maturity is about 20 weeks. Net reproduction of 0.8 eggs per adult per week occurs.
The Eudrilidae are a family of earthworms, mostly of Africa. One species, Eudrilus eugeniae (Kinberg, 1867), is widely distributed around the warmer parts of the world and historically cultured as the "African nightcrawler". [1] [2] The male pores of eudrilids are in segment 17, as is also typical of Ocnerodrilidae.
Male genitalia of Lepidoptera. The main component of the male reproductive system is the testicle, suspended in the body cavity by tracheae and the fat body.The more primitive apterygote insects have a single testis, and in some lepidopterans the two maturing testes are secondarily fused into one structure during the later stages of larval development, although the ducts leading from them ...
Spooky season is bringing along with it perhaps the spookiest things of all; spiders. As these creepy crawlers look for warm hiding places among cooling temperatures, they may find comfort — and ...
Earthworms are another example of a simultaneous hermaphrodite. Although they possess ovaries and testes, they have a protective mechanism against self-fertilization. Sexual reproduction occurs when two worms meet and exchange gametes, copulating on damp nights during warm seasons.