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One of the most interesting aspects of earthworms is their sexuality. Earthworms are simultaneous hermaphrodites, meaning worms have both male and female reproductive organs. During sexual intercourse among earthworms, both sets of sex organs are used by both worms. If all goes well, the eggs of both of the mates become fertilized.
May 26, 2024 · A. Definition and Characteristics. Simultaneous hermaphrodites are organisms that possess both male and female reproductive organs. This dual-gendered condition allows them to produce eggs and sperm, enabling self-fertilization or the fertilization of other individuals. Unlike other forms of hermaphroditism, simultaneous hermaphrodites maintain ...
Jan 1, 2010 · Earthworms are generally cross-fertilization hermaphrodites, but up to 40% of the species can be parthenogenetic. In simultaneous hermaphrodites, a trade-off between male and female sexual functions is expected because the two sexes share limited resources from the same individual. In this chapter, several issues regarding sexual selection such ...
- Darío J. Díaz Cosín, Marta Novo, Rosa Fernández
- 2011
Jul 1, 2013 · Earthworms are simultaneous hermaphrodites, and reproduction usually occurs through copulation and cross-fertilization, after which each of the mated individuals produces cocoons containing variable numbers of fertilized ova (Fig. 1). The resistant cocoons are usually deposited near the soil surface, except in dry weather when they are laid in deeper layers.
- Jorge Domínguez, Alberto Velando
- 2013
The earthworm life cycle, like many others, starts with an egg. Within the egg, a young earthworm develops until it is ready to hatch. The egg is encased in an egg casing called a cocoon. The number of eggs within one cocoon can vary between species, ranging between 1 and 20 from earthworm species in the family Lumbricidae (but most species ...
Nov 9, 2010 · Earthworms are generally cross-fertilization hermaphrodites, but up to 40% of the species can be parthenogenetic. In simultaneous hermaphrodites, a trade-off between male and female sexual ...
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Oct 19, 2016 · Here, we address these questions by exploring the potential for sexual selection in simultaneous hermaphrodites, sperm- and broadcast spawners, plants and fungi. Our review reveals a range of mechanisms of sexual selection, operating primarily after gametes have been released, which are common in many of these groups and also quite possibly in more familiar (internally fertilizing and sexually ...
