astropyle

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astropyle
astropyle Zool. (ˈæstrəʊpaɪl) [f. Gr. ἄστρον star + πύλη gate.] A tubular aperture or funnel-like membranous projection found in some radiolarians.1887 E. Haeckel Radiolaria in Rep. Challenger XVIII. i. p. iv, This osculum is closed by a radiate cover (astropyle or operculum radiatum). 1888 Rollesto... Oxford English Dictionary
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Ventrifilosa
This aperture is called "cleft" when belonging to an amoeboflagellate, or "astropyle" when belonging to a phaeodarian. wikipedia.org
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operculum
operculum (əʊˈpɜːkjʊləm) Pl. -la. [a. L. operculum cover, covering, lid, f. operīre to cover, close: see -culum.] An organ or structure forming or resembling a lid or cover; spec. 1. Zool. a. The gill-cover of a fish; esp. the hindmost and uppermost bone of this.1752 Sir J. Hill Hist. Anim. 225 They... Oxford English Dictionary
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