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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The transparent creatures, called bdelloid rotifers, live in fresh water but every one of the species is female.
Key to the identification of the genera of bdelloid rotifers.
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.
Traces of two large families of transposable elements that copy themselves and proliferate when a species reproduces sexually showed up in most of the animals but not in the bdelloid rotifers, the researchers reported in 2000.
Washington, January 29 (ANI): A new research has discovered that the secret to the evolutionary longevity of very small invertebrates called bdelloid rotifers is that they are microscopic escape artists that dry up and are promptly gone with the wind when faced with pathogens.
Bdelloid rotifers are tiny, freshwater invertebrates that have long puzzled scientists because, as completely asexual animals, they should have been extinguished by parasites and pathogens long ago in evolutionary time.
Microscopic bdelloid rotifers have seemingly evolved without sex for millions of years and probably don't exist in male form, say Harvard University biologists.