anal plate


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anal plate

[′ān·əl ‚plāt]
(embryology)
An embryonic plate formed of endoderm and ectoderm through which the anus later ruptures.
(vertebrate zoology)
One of the plates on the posterior portion of the plastron in turtles.
A large scale anterior to the anus of most snakes.
References in periodicals archive ?
It is different from Arachnocrinus in the conical rather than rounded cup, five infrabasals, rather than single fused conical infrabasal circlet, the presence of an anal plate in the cup, in the axillary primibrachials and secundibrachials contacting the radial facet, completely different arm construction and in the rounded rather than square outline of the stem facet, with a wide axial canal with no additional canals.
In the interray CD they are separated by the elevated distal part of the anal plate.
Anal plate convex, with numerous short and medium-size setae.
Fifth abdominal sternite shallowly concave at the middle, weakly furrowed on midline; anal plate short, deeply furrowed on midline, with 40 short setae, posterior margin entire at middle.
Several of the traits consist of bristle number on the following structures: male anal plate, clasper, sex comb, and fifth sternite; female dorsal anal plate, ventral anal plate, vaginal plate (average of left and right), and sixth sternite.
2G); supra anal plate yellowish brown, with anterior margin slightly concave, lateral ones constricted on median portion and posterior rounded, with thick bristles (Fig.
9) exists between anal plate perimeter and surface area with larval body width and length (Fig.
Anal plates each with 4 setae near apex; anal ring with 5 pairs of setae.
Visible abdominal sternites 2[degrees] to 5[degrees] convex, with scattered, setiferous punctures; anal plate longer than in male, strongly convex, punctate, with scattered long setae near the basal border and row of 8 slender setae on apical border.
At least three anal plates in cup; radianal very small, quadrangular (rectangular to trapezoidal), below and to right of anal X; anal X heptagonal, higher than wide, somewhat smaller than radials, with stellate ridges to adjacent plates; one large sac plate immediately above anal X that is partially in aboral cup (Fig.