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 ?
Supra anal plate medium brown on anterior portion and distal projections, and yellowish brown on center; anterior margin concave on median part, lateral ones constricted on median portion and very extended distal projections (Fig.
2G); supra anal plate yellowish brown, with anterior margin slightly concave, lateral ones constricted on median portion and posterior rounded, with thick bristles (Fig.
Supra anal plate semi circular or subtriangular, with lateral margin moderately convergent, weakly convex at the posterior region.
At 12,000 X, the cuticle of the anal plate surface appears to have small holes or pits though more detailed electron microscopy is needed to determine the exact nature of these structures separating them from possible artifacts (Fig.
9) exists between anal plate perimeter and surface area with larval body width and length (Fig.
Genital plate brown, sometimes darker than anal plate and cauda; with 24(7) discal and 10-16 long and pointed marginal setae.
Cauda light brown to brown, like anal plate and proximal part of SIPH; 0.
Anogenital fold with a pair of setae on each corner of anterior margin, each about 16-18 [micro]m long; each anal plate also with 1 seta ventral lateral margin seta.
Anal plates each with 4 setae near apex; anal ring with 5 pairs of setae.
from the front to the tip of the cauda or the posterior edge of the anal plate, respectively.
Visible abdominal sternites 2[degrees] to 4[degrees] slightly depressed at middle; 5th sternite widely convex, shiny, with scattered setiferous punctures; anal plate long, weakly concave, with a central, moderate prominence covered by setigerous granules (Fig.
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.