the seminal fluid: in plural form is sometimes used as =
spermatozoa; q.v.

Spermatheca: = spermatotheca; q.v.

Spermatid: the final cells which are converted without further division
into spermatozoa: they arise by division of the second spermatocytes
(Wilson).

Spermatocytes: the cells arising from the spermatogonia. The primary
spermatocyte arises by growth of one of the last generation of
spermatogonia. By its division are formed two secondary
spermatocytes, each of which give rise to two spermatids (Wilson).

Spermatogenesis: the development of spermatozoa.

Spermatogonia: the descendants of the primordial germ cells in the
male. Each ultimate spermatogonium typically gives rise to four
spermatozoa.

Spermatophora: a sac or case containing spermatozoa.

Spermatotheca: the sac or reservoir in the female, that receives the
sperm during coition: = spermatheca and receptaculum seminis.

Spermatozooen-zoa: the male cell or cells which, by uniting with the
ova, fertilize them.

Spherical: in the form of a sphere: a body in which all diameters are
equal.

Spherule: a minute sphere or globule.

Spicula: a slender needle-like process: e.g. the sting in bees: also
employed as = ovipositor: q.v.

Spiculiform: like a slender, needle-like process.

Spiculum: a small spicule or thin, pointed process.

Spinate: produced into an acuminate spine.

Spindle-shaped: cylindrical, elongate, thicker in the middle, tapering
to each end: fusiform.

Spine: a sharp process: in Coccidae there are two, one each side of
each segment of the pygidium.

Spiniferous: bearing, or clothed with spines.

Spiniform: in the form or shape of a spine.

Spinneret: the ligula in bombycid and some other larvae, modified for
silk spinning: any organ consisting of an internal tube, terminating in
a pore, spine or process, producing a silky or waxy fibre: in the
plural, the organs concerned in the emission of the silky or cottony
filaments of which the scales or sacs of Coccidae are produced: =
fusulus.

Spinose -ous -ed: set with acute processes or spines.

Spinous-radiate: beset with spines in a circle, either concatenate,
united at their bases, or setaceous, like bristles.

Spinulae: spinous processes at the apex of the tibia: also called
spines, spurs or heels.

Spinulate -ose: set with little spines or spinules.

Spinules: little spines.

Spira: the coiled ovipositor of Cynipidae.

Spiracle -cula: a breathing pore: q.v.: