Caenorhabditis elegans
The Caenorhabditis elegans species is a non-parasitic nematode about a millimeter in length and is a unsegmented pseudocoelomate, meaning that they are missing a respiratory and circulatory system. A majority of female nematodes of this species are hermaphrodites, meaning that they can act as either the male or female during reproduction. Spicules are needle-like structures found on tails of male nematodes for mating purposes.
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During reproduction, a female can internally fertilize itself because it is a hermaphrodite. After internal fertilization, the female lays its eggs through its uterus.
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