from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Alternative form of epistome.
from the GNU version of the Collaborative International Dictionary of English
- n. The region between the antennæ and the mouth, in Crustacea.
- n. A liplike organ that covers the mouth, in most Bryozoa. See Illust., under entoprocta.
from The Century Dictionary and Cyclopedia
- n. In zoology, some part, region, or organ borne upon or lying before the mouth.
- n. Also epistome.
- n. The anterior part of the cephalic doublure of the Trilobita, sometimes isolated by the sutures.
Sorry, no etymologies found.
Peristoma - ium: the border of the mouth or oral margin in Diptera; sometimes used as: = epistoma: q.v. Peristome: a membranous tissue surrounding the mouth parts at base, and forming the true ventral wall of the head.
Clypeus: that portion of the head before or below the front, to which the labrum is attached anteriorly; in Diptera often visible below the margin of the mouth in front, as a more or less visor-shaped piece: = epistoma.
_Antennæ_ epistoma non attingentes; articulus tertius longiusculus, linearis, apice conicus; arista subpubescens.
Antennæ nearly reaching the epistoma; third joint long, linear, conical at the tip; arista pubescent.
_ Head and thorax with bright silvery tomentum, facialia without bristles, epistoma slightly prominent; eyes bare; mouth black, testaceous towards the base, full as long as the thorax; antennæ tawny, not reaching the epistoma, arista plumose; legs black, coxæ and femora testaceous; wings grey, veins black.
Face flat, brightly gilded; epistoma not prominent; mystax with a few white bristles; mouth black; antennæ ferruginous, black towards the tips, longer than the breadth of the head; third joint linear, longer than the first and the second together; pectus with three hoary bands; abdomen subclavate, nearly twice the length of the thorax;
Vertex and mouth piceous; epistoma with a piceous line on each side; third joint of the antennæ black above; abdomen black along each side and at the tip, and with two black bands which are angular in front; wings cinereous.
Antennæ small; third joint elongate-conical, not extending more than half the length to the epistoma; arista plumose.
Head transverse, hardly broader than the thorax, with two erect setæ on the hind part of the vertex; face vertical; epistoma slightly prominent.
Antennæ not reaching the epistoma; third joint linear, rather long, conical at the tip; arista somewhat pubescent.