Venu Kantamani 04/07/14 Vu - PAP Bio - Period 4
Earthworms have 4 distinct parts of the life cycle. They can mate with any other earthworms because all earthworms are hermaphrodites, meaning that they contain both the male and female reproductive organs.
The internal anatomy of the earthworm consists of the mouth, septum, hearts (aortic arches), seminal vesicles, dorsal blood vessel, nephridia, intestine, ventral blood vessel, oviduct, ovary, testis, sperm duct, seminal receptacle, pharynx, esophagus, and crop.
The external anatomy of the earthworm consists of the prostomium, peristomium, mouth, setae, septum, opening of seminal receptacle, female genital pore, male genital pore, seminal groove, genital setae, and clitellum.
Earthworms go by a multitude of other names including dew worm, squirrel tail, twachel, or night crawler. They are native to and extremely common in Europe but have been introduced in many parts of the world. All earthworms are hermaphrodites meaning that they contain both the male and female reproductive organs.