planuloidadj.
/ˈplanjᵿlɔɪd/, U.S. /ˈplænjəˌlɔɪd/ Zoology.
Having the form of or resembling a planula; esp. designating a hypothetical ancestral metazoan of this form.
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the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > of form of embryo
planuliform1877
planuloid1890
1890 Cent. Dict. Planuloid, resembling a planula; planuliform.
1954 Q. Rev. Biol. 29 241/2 From a hypothetical, generalized, planuloid progenitor it is possible to derive each of the existing groups of the phylum Platyhelminthes.
1978 Nature 14 Dec. 702/2 That the first primitive herbivores and deposit feeders evolved from a pelagic planuloid ancestor is plausible.
1991 A. I. Tauber & L. Chernyak Metchnikoff & Origins of Immunol. i. Fig. 3 (caption) The introgressive development of Metchnikoff's parenchymella modeled after planuloid development.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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