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A vestigial twin is a form of parasitic twinning,[1] where the parasitic "twin" is so malformed and incomplete that it typically consists entirely of extra limbs or organs. It also can be a complete living being trapped inside the host person, however the parasitic twin is anencephalic and lacks consciousness.
This phenomenon occurs when a fertilized ovum or partially formed embryo splits incompletely. The result can be anything from two whole people joined by a bit of skin (conjoined twins), to one person with extra body parts belonging to the vestigial twin.
Most vestigial limbs are non-functional, and although they may have bones, muscles and nerve endings, they are not under the control of the host. The possession of six or more digits on the hands and feet (polydactyly) usually has a genetic or chromosomal cause, and is not a case of vestigial twinning.
^Stevenson, Roger E. (2015-10-27). Human Malformations and Related Anomalies. Oxford University Press. p. 910. ISBN 9780199386031.
A vestigialtwin is a form of parasitic twinning, where the parasitic "twin" is so malformed and incomplete that it typically consists entirely of extra...
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four arms and one leg each, and a third, vestigial limb at their back that had some movement. When the twins were born, their mother was told they required...
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vestigial connecting rod to a balance weight. The result was a parallel twin with significantly reduced vibration compared with other parallel twin engine...
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one functional lung. Some species retain a pelvic girdle with a pair of vestigial claws on either side of the cloaca. Lizards have independently evolved...
third vestigial connecting rod to a balance weight. The result is a parallel twin with significantly reduced vibration compared to other parallel twin engine...
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kind of pollination, the calyx and corolla are radically reduced to only vestigial remnants found as an adherent perianth coating the seed. A reduced and...
is a masked man who wears a set of armor to cover his degenerated and vestigial legs while using his arms to move. The armor acts like a top, with him...
magical artifacts that can keep them in check. This detail is one of the vestigial hints that August Derleth developed into the mostly unnamed Elder Gods...
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the fingers or toes Uterus didelphys – two vaginal canals and/or uteri Vestigial structures are anatomical structures of organisms in a species which are...