Bdelloidea

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Bdelloidea

[də′lȯid·ē·ə]
(invertebrate zoology)
An order of the class Rotifera comprising animals which resemble leeches in body shape and manner of locomotion.
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If bdelloids are not having sex, how can they avoid the accumulation of deleterious mutations or generate new diversity?
Key to the identification of the genera of bdelloid rotifers.
Also, there are striking differences between the two rotifer classes; although both are represented in both temporary and permanent waters, the bdelloids are more likely in the former and the monogononts are more likely in the latter (Ricci, 1987, 2001).
Two kinds of bdelloid were even found living on the body of one animal - a water louse - yet the one living on the louse's legs had evolved separately to the one which lives on the louse's chest.
GIRL POWER: The bdelloid rotifers lay eggs which turn into clones of the mother
This is an unprecedented finding with no known explanation, and if it is found to be more widespread it may help explain the occasional evolutionary longevity of asexual species such as bdelloid rotifers.
The ovaries in bdelloid rotifers, however, create eggs containing the full genome.
The fossil record so far hasn't said much about the history of bdelloid rotifers--only that some specimens found in amber dating from 35 to 40 million years ago didn't include any obvious males.
The bdelloids are playing this never-ending game of hide-and-seek," said Sherman.
After drying up, bdelloids come back to life when re-exposed to fresh water.
Instead, the bdelloids have proliferated into more than 450 species.
One of the strongest candidates for ancient asexuals, bdelloid rotifers date back at least 40 million years.