Spiral threadfilament see taenidium

spiramen n. [L. spiramen, vent] (BRYO) A median pore, not connected to the ascus, in the frontal wall on the proximal side of the orifice.

spirasters n.pl. [L. spira, coil; aster, a star] (PORIF) Spirally twisted streptasters.

spire n. [L. spira, coil] (MOLL: Gastropoda) The complete series of whorls of a spiral shell except the last.

spire angle (MOLL: Gastropoda) In plane through entire shell axis, angle between two straight lines that touch all the whorls on opposite sides; these lines can only be drawn if the rate of the whorl increase is constant.

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