panoisticadj.
/ˌpanəʊˈɪstɪk/, U.S. /ˌpænəˈwɪstɪk/, /ˌpænoʊˈɪstɪk/ Chiefly Entomology.
Designating or relating to an ovary or ovariole which produces ova only, without nurse cells. Contrasted with meroistic.
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the world > animals > invertebrates > phylum Arthropoda > class Insecta > parts of insects > [adjective] > of abdomen > having ovary producing eggs without cells
panoistic1877
1877 T. H. Huxley Man. Anat. Invertebrated Animals vii. 443 Dr. A. Brandt has proposed the term panoistic for ovaries of the first mode, and meroistic for those of the second and third modes of development of the ova here described.
1947 A. D. Imms Outl. Entomol. (ed. 3) ii. 71 The panoistic type [of ovariole] is devoid of trophocytes, the developing oöcytes being nourished by products elaborated from the blood by the follicular epithelium. This is the primitive type of egg-tube and is found in Apterygota, Orthoptera and other of the lower Pterygota.
1969 R. F. Chapman Insects xv. 290 In panoistic ovarioles..the chromosomes of the oocyte have a lampbrush configuration suggesting RNA formation.
1993 Nature 4 Feb. 401/2 Schistocerca (like all orthopterans) has the ancestral (panoistic) form of oogenesis, with no nurse cells.
This entry has been updated (OED Third Edition, March 2005; most recently modified version published online March 2022).
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adj.1877