Trigonops Guérin-Méneville
Creators: name: Zimmerman, Elwood C.
Publisher: name: Zenodo
Year: 1942
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Trigonops

description: KEY TO THE SPECIES OF GUAM TRIGONOPS 1. Elytra conspicuously uneven, with numerous irregularities on the disk; intervals 5, 6, and 7, especially 5 and 6, rather prominently and irregularly elevated at the top edge of the lateral declivity; prothoracic puncturation very coarse and dense, the punctures tending to be longitudinally confluent, the interstices irregular, some broader, many narrower than the punctures (length 5 to 8 mm.).............................................2. <b>T.</b> inusitata Zimmerman. Elytra not so formed; prothorax not very coarsely punctate, the interstices almost always broader than the punctures; if the prothorax is comparatively coarsely punctate and elytral intervals 5, 6, and <i>7</i> elevated, then the disk of the elytra is never irregular and the length is less than 5 mm. 2 2(1). Pronotum obviously depressed above, distinctly angulate at the sides of the disk at base in front of elytral intervals 6 and <i>7,</i> the angulation formed by a low, rounded, short, longitudinal carina that is covered with paler scales in fresh specimens, disk, when denuded, densely and conspicuously granulate and with scattered indistinct punctures.......................... <i>3.</i> <b>T.</b> inaequalis Zimmerman. Pronotum usually quite distinctly convex above and not obviously depressed, without a baso-lateral carina before elytral interval 6..................................... <i>3</i> 3(2). First funicular segment obviously longer than second, fully a fourth or a third longer than second................................................................................................ 4 First funicular segment as long or just perceptibly longer than second, never a quarter longer (usually between 15/13 or 12/11 as long).............................. 5 4(3). Prothorax as long or slightly longer than broad; scales on dorsum each appearing hard, smooth, convex and shiny.......... 4. <b>T. subfasciatus</b> (Boheman). Prothorax broader than long; scales of dorsum not smooth, convex and shiny, but appearing soft and spongy, each coarsely reticulate or farinaceous........................................................................................ 5. <b>T. hirsuta</b> Zimmerman. 5(3). Entire elytra including disk bristling with long, almost straight conspicuously erect or but slightly curved, black, hairlike setae; disk of pronotum with short erect setae............................................................ 6. <b>T.</b> impura (Boheman). Elytral and pronotal disks with decumbent or prostrate setae only, never with conspicuously erect setae...................................................................................... 6 6(5). Discal elytral intervals without any setae on basal half...................................... TODO TODO TODO TODO Discal elytral intervals with setae on basal halves.................................................. <i>7</i> 7(6). Eyes not strongly convex and not protuberant (as in fig. 1, <i>a),</i> as long or slightly longer than distance between them; distance between median angle of interocular suture and apex of transrostral carina more than three fourths to fully as long as narrowest interocular breadth; setae on mid and hind femora closely appressed to derm, with their recurved tips usually touching or almost touching the derm.......................... 8. <b>T. convexa</b> Zimmerman. Eyes strongly convex (as in fig. 1, <i>b),</i> shorter than distance between them; distance between median angle of interocular suture and apex of transrostal carina much shorter than narrowest interocular breadth; setae on mid and hind femora, especially along lower edge, slanting rather distinctly away from derm and giving lower edge of femora a rather spiny appearance............................................................................................9. <b>T. vulgaris</b> Zimmerman.
description: Published as part of <i>Zimmerman, Elwood C., 1942, Curculionidae of Guam, pp. 73-146 in Insects of Guam I, Honolulu, Hawaii :Bernice P. Bishop Museum</i> on pages 82-83, DOI: 10.5281/zenodo.5159964