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monactinal
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monactinal
monactinal, a. (mɒˈnæktɪnəl) [Formed as next + -al1.] Of a sponge-spicule: That has only one ray.1887 S. O. Ridley in Rep. Voy. Challenger XX. Introd. 6 The chief spicules of the group are ‘monactinal’, that is to say, consisting of only a single ray.
Oxford English Dictionary
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monactine
monactine, a. (mɒˈnæktɪn) [f. (mod.L. type *monactīn-us) Gr. µόνο-ς (see mono-) + ἀκτιν-, ἀκτίς ray.] = monactinal a.1887 W. J. Sollas in Encycl. Brit. XXII. 416 (Fig. 12), Typical megascleres. a, rhabdus (monaxon diactine); b, stylus (monaxon monactine).
Oxford English Dictionary
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Suberites domuncula
Monactinal tylosyles and a small fraction of diactinal oxeas make up the megascleres found in the skeleton of S. domunucula.
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diactine
diactine, a. (and n.) Zool. (daɪˈæktɪn) [f. di-2 + actine 2.] Of a monaxon sponge spicule: having two rays, growing in both directions. Also as n., a spicule of this type. Hence diˈactinal a.1888 Sollas in Challenger Rep. XXV. p. liii, Diactine (diactina).—A monaxon in which growth proceeds in both ...
Oxford English Dictionary
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Sponge spicule
The ends of diactinal monaxons are similar, whereas monactinal monaxons have different ends: one pointed, one rounded.
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