hexactin

hexactin

[hek′sak·tən]
(invertebrate zoology)
A spicule, especially in Porifera, having six equal rays at right angles to each other.
References in periodicals archive ?
Range Dermal pinule A pinulus length ([micro]m) 15 [+ or -] 24 88-222 tangential ray length ([micro]m) 156 [+ or -] 22 104-227 proximal ray length ([micro]m) 304 [+ or -] 155 68-728 Gastral pinule B pinulus length ([micro]m) 198 [+ or -] 47 85-280 tangential ray length ([micro]m) 170 [+ or -] 37 104-247 proximal ray length ([micro]m) 135 [+ or -] 33 65-193 Scopule F length ([micro]m) 606 [+ or -] 84 420-756 Scopule G length ([micro]m) 537 [+ or -] 103 369-751 Hexactin D ray length ([micro]m) 216 [+ or -] 47 146-341 Hexactin C ray length ([micro]m) 172 [+ or -] 41 100-278 Uncinate length (mm) 5.
The simple zoological diagnosis of Heterochone is: Aphrocallistidae with atrialia as pinular hexactins.
1A, arrows); wall 1 cm thick penetrated by radial diarhyses (skeletal channels of dictyonal framework) passing from dermal to atrial surface; dermal surface entirely covered by rectangular lattice of loose pinular hexactins of 149-183-235 [micro]m mesh (Fig.