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.
References in periodicals archive ?
Peristome oblique, aperture subcircular; columella concave, lacking dentition; outer lip notched at ends of spiral cords in juveniles and subadults, but less so in the largest specimens, when growth has ceased; even in the most mature specimens the outer lip is not conspicuously thickened and there is no trace of apertural teeth; interior nacreous and smooth, save for weak angles beneath external cords.
Peristome oblique; aperture D-shaped; columella more or less straight, a single weak tooth or rounded bulge present at its base in mature specimens; outer lip strongly notched at ends of peripheral and basal cords, particularly in subadults; interior of outer lip weakly thickened with in-running ridges at maturity, but most local material somewhat subadult in this respect; interior of aperture nacreous, angled beneath peripheral cord.
Insect aquaplaning: Nepenthes pitcher plants capture prey with the peristome, a fully wettable water-lubricated anisotropic surface.
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.
The spines of the urchins were removed by a slim pointed tip Lodestar stainless steel tweezers, L605014; the peristome was cut using a scalpel; the Aristotle's lantern was removed using forceps, and finally the coelomic fluid was removed using a one-milliliter sterile Q Ject Ultra insulin syringe.