urmetazoan
The hypothetical common ancestor of all animals
(archaic) A nocturnal ambush or surprising act of aggression. / (obsolete) A shirt worn by soldiers over their uniform, in order to be able to recognize one another in a night attack.
Alternative form of lething
plural of locant
古生物学者たちは、どの化石が現生の動物系統を生み出したと考えられるすべての動物の仮説上の共通祖先に相当するかを議論している。
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