Peritreme

Elongated sclerite extending forward from the stigma of certain mites, mainly in the suborder Mesostigmata.

Peritreme

Per'i·treme noun [ Prefix peri- + Greek ... a hole.] (Zoology) (a) That part of the integument of an insect which surrounds the spiracles. (b) The edge of the aperture of a univalve shell.
Found on http://www.encyclo.co.uk/webster/P/58

Peritreme

• (n.) The edge of the aperture of a univalve shell. • (n.) That part of the integument of an insect which surrounds the spiracles.
Found on http://thinkexist.com/dictionary/meaning/peritreme/
No exact match found