mesothecan.
/ˌmɛsə(ʊ)ˈθiːkə/, U.S. /ˌmɛzoʊˈθikə/; see also meso- comb. form. Zoology and Palaeontology.
Originally: the middle layer of the sac enclosing the gonophore in certain hydrozoans. Later also: the median lamina on which the individuals of a bifoliate bryozoan colony are supported.
ΚΠ
1871 G. J. Allman Monogr. Gymnoblastic Hydroids Introd. p. xv Mesotheca... The middle one of the three laminæ of the perigonium.
1968 Jrnl. Palaeontol. 42 356 The Mississippian ectoproct species Actinotrypa peculiaris..contains a bilaminate mesotheca.
1998 Palaeontol. Zeitschr. 72 89 In Nipponostenopora karatauensis n. sp., colonies have a pseudobifoliate form resembling true bifoliate colonies but lacking a mesotheca.
1999 R. Singer Encycl. Paleontol. I. 211/1 The Ptilodictyina, the 40 genera of the bifoliates, are recognized by flat thin branches constructed in two-part fashion from a central flat sheet (mesotheca or median lamina).
This entry has been updated (OED Third Edition, September 2001; most recently modified version published online March 2022).
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n.1871- irreducibilities
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