prothecan.

Brit.

/prəʊˈθiːkə/, U.S.

/proʊˈθikə/

Origin: Formed within English, by derivation. Etymons: pro- prefix², theca n.

Etymology: < pro- prefix² + theca n. Compare slightly earlier prototheca n. at proto- comb. form 2a.

Zoology and Palaeontology.

An enclosing structure or sheath, or a part of one, which is primary in nature or basal in position (cf. theca n. 3a); esp. (a) (in a coral polyp) the theca in its initial or rudimentary form (rare); (b) (in a foraminiferan of the superfamily Fusulinacea) an unmodified primary wall; (c) (in a graptolite of the order Graptoloidea) the basal part of a theca, attached to the sicula. Cf. prototheca n. at proto- comb. form 2a.

ΘΚΠ

the world > animals > invertebrates > protozoa > class Sarcodina > order Rhizopoda > [noun] > suborder Foraminifera > member of > primary wall

protheca1907

1907 Science 10 May 734/1 This paper considers..Streptelasma and allied genera of the rugose corals and describes the protheca as observed in these genera.

1937 L. G. Henbest in Jrnl. Palaeontol. 11 212/1 I am applying the term epitheca to all secondary shell material [of Fusulina] such as tectorium and chomata, and the term protheca to the primary wall-layers.

1940 Chambers's Techn. Dict. 680/1 Protheca, the calyx rudiment in coral formation.

1958 Philos. Trans. (Royal Soc.) B. 241 495 The first theca [in Monograptus separatus]..begins with a slowly widening protheca; near the tip of the sicula the rate of prothecal widening increases.

1972 Jrnl. Paleontol. 46 925/1 A second table summarizes the regression analyses..between radius vector and protheca thickness [sc. in fusulinids].

1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) x. 311/2 Each theca [in Saetograptus chimaera] has two parts: the protheca, proximal to the nema, through which the common canal runs; and a metatheca, which is the external part.

This is a new entry (OED Third Edition, September 2007; most recently modified version published online March 2022).

单词	protheca
释义	prothecan. Brit. /prəʊˈθiːkə/, U.S. /proʊˈθikə/ Origin: Formed within English, by derivation. Etymons: pro- prefix², theca n. Etymology: < pro- prefix² + theca n. Compare slightly earlier prototheca n. at proto- comb. form 2a. Zoology and Palaeontology. An enclosing structure or sheath, or a part of one, which is primary in nature or basal in position (cf. theca n. 3a); esp. (a) (in a coral polyp) the theca in its initial or rudimentary form (rare); (b) (in a foraminiferan of the superfamily Fusulinacea) an unmodified primary wall; (c) (in a graptolite of the order Graptoloidea) the basal part of a theca, attached to the sicula. Cf. prototheca n. at proto- comb. form 2a. ΘΚΠ the world > animals > invertebrates > protozoa > class Sarcodina > order Rhizopoda > [noun] > suborder Foraminifera > member of > primary wall protheca1907 1907 Science 10 May 734/1 This paper considers..Streptelasma and allied genera of the rugose corals and describes the protheca as observed in these genera. 1937 L. G. Henbest in Jrnl. Palaeontol. 11 212/1 I am applying the term epitheca to all secondary shell material [of Fusulina] such as tectorium and chomata, and the term protheca to the primary wall-layers. 1940 Chambers's Techn. Dict. 680/1 Protheca, the calyx rudiment in coral formation. 1958 Philos. Trans. (Royal Soc.) B. 241 495 The first theca [in Monograptus separatus]..begins with a slowly widening protheca; near the tip of the sicula the rate of prothecal widening increases. 1972 Jrnl. Paleontol. 46 925/1 A second table summarizes the regression analyses..between radius vector and protheca thickness [sc. in fusulinids]. 1993 E. N. K. Clarkson Invertebr. Palaeontol. & Evol. (ed. 3) x. 311/2 Each theca [in Saetograptus chimaera] has two parts: the protheca, proximal to the nema, through which the common canal runs; and a metatheca, which is the external part. This is a new entry (OED Third Edition, September 2007; most recently modified version published online March 2022). < n.1907
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