> as lemmas

† archaeostomatous adj. Zoology Obsolete rare (with reference to the classification system of T. H. Huxley) belonging to a group ( Archaeostomata) of invertebrates in which the mouth is derived from the embryonic blastopore (primary opening of the gastrula); of or relating to this group. [After scientific Latin Archaeostomata (1874).] The Archaeostomata included the coelenterates and most kinds of worm. The latter (but not the former) are included in the group of invertebrates now known as protostomes, which is defined by the same characteristic as Huxley's group and also includes molluscs and arthropods.Contrasted with deuterostomatous adj. at deutero- comb. form .