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placula
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placula
‖ placula Biol. (ˈplækjʊlə) [mod.L., dim. from Gr. πλάξ, πλάκ- tablet, plate.] Name for the embryo of Calcispongiæ at that stage in its development when it has the form of a plate or disc. Hence ˈplacular, ˈplaculate adjs., having the form of a placula.1884 A. Hyatt in Proc. Boston Soc. Nat. Hist. X...
Oxford English Dictionary
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Hoilungia
Grell derived the name from the placula hypothesis, Otto Bütschli's notion on the origin of metazoans.
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diplo-
diplo- (ˈdɪpləʊ) before a vowel dipl-, combining form of Gr. διπλό-ος, διπλοῦς twofold, double, occasional in ancient Greek, now used in many scientific terms; e.g. diplaˈcusis Path. [Gr. ἄκουσις hearing], double hearing, the hearing of two notes when only one is produced, due to the hearing of a di...
Oxford English Dictionary
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Urmetazoan
The placula hypothesis, proposed by Otto Bütschli, holds that the last common ancestor of animals was an amorphous blob with no symmetry or axis. This explanation leads to the formation of the bilaterian body plan; the urbilaterian would develop its symmetry when one end of the placula became adapted
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planula
‖ planula Zool. (ˈplænjʊlə) Pl. -æ. [mod.L., a little plane, dim. of plānus plane a.] The flat-shaped ciliated free-swimming embryo of certain Hydrozoa; hence extended to a similar embryo in Cœlenterates generally.1870 Nicholson Man. Zool. 89 The embryo is a free-swimming, oblong, ciliated body, ter...
Oxford English Dictionary
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Placozoa
Grell derived the name from the placula hypothesis, Otto Bütschli's notion on the origin of metazoans.
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