Century Dictionary and Cyclopedia
- n. In zoology, some part, region, or organ borne upon or lying before the mouth. Specifically— In Polyzoa, a process overhanging the mouth of many species; the prostomium. Also
- n. Also epistome.
- n. The anterior part of the cephalic doublure of the Trilobita, sometimes isolated by the sutures.
- n. Alternative form of epistome.
GNU Webster's 1913
- 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.
“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.”
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