peristome


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Related to peristome: calyptra

peristome

[′per·ə‚stōm]
(botany)
The fringe around the opening of a moss capsule.
(invertebrate zoology)
The area surrounding the mouth of various invertebrates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
ravenelii to Cryphaea so that the genus included both species with single and double peristome. Rao (2001) proposed the genus Monocryphaea to accommodate this last species.
Conical straight free tube parts with well-developed transverse ornamentation in form of peristomes with the regularly undulating edge.
Peristome complete, mostly somewhat higher than wide, PH: PW 0.96-1.16 in available specimens, median 1.11, in holotype 1.05.
The shell bears a large, wide aperture surrounded by a wide, thick, reflected peristome that may be free from (Fig.
Peristome Any parts around the mouth or oral opening of invertebrates (comparable to lips).
Peristome well developed; exostome yellowish, lower outside ornamentation dotted (reticulate at high magnification), upper outside ornamentation papillose, border broad; endostome hyaline, basal membrane high, 40-45% of endostome height, segments narrowly perforated, finely papillose, cilia 2-4, long, nodose.
As the new tube emerged from the hole, it was initially directed upward at an angle of about 45 degrees from the parent's tube, continuous With the peristome formed by the parent immediately prior to constructing the escape hatch (Fig.
Peristome double, exostome cross-striolate below, papillose above; endostome segments papillose, membrane basal high, cilia none.
Surrounding most of the opening of the pitcher is a swollen portion of tissue called the peristome or "lip." Nectar is commonly found on the lip and other surfaces of the pitcher (Schnell, 2002).
Protoconch sculpture nude, or with difuse radial wrinkles; radial ribs thick, without spiral striation; pyramidal shell; peristome sharp, keel-like, resembling a sophonostoma Chellius piramidalis sp.n.
Peristome well developed; exostome yellowish, brownish towards base, lower outside ornamentation cross-striolate, upper outside ornamentation papillose, border broad, widened where ornamentation changes from cross-striolate to papillose; endostome hyaline to yellowish, basal membrane high, about 35-40% of endostome height, segments perforated, papillose, cilia 2-3, long, appendiculate at least in upper part of cilia, otherwise nodose.