Tytthoxydema Zimmerman 1942, new genus
Creators: name: Zimmerman, Elwood C.
Publisher: name: Zenodo
Year: 1942
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Curculionidae
Tytthoxydema

description: Genus TYTTHOXYDEMA, new genus <i>Body</i> slender, subcy!indrical, nitid, minutely setose. <i>Head</i> subconical, as broad as long, with a distinct postocular constriction situated well behind eyes interrupting both dorsal and lateral surfaces; eyes moderately large, lateral, not strongly protuberant, as widely separated below as above, separated from prothorax by a distance distinctly greater than length of an eye; interocular area slightly narrower than extreme base of rostrum. <i>Rostrum</i> almost as long as head, about half as long as prothorax, slightly arcuate, stout, lat!erally expanded from base to apex; antennae inserted close to base at less than diameter of an eye in front of eyes; scrobes passing downward along the fore edges of the eyes. <i>Antennae</i> with scape reaching to or slightly behind hind margins of eyes, longer than funicle; funicle 5-segmented, first segment longer than any of others, the following successively shorter; club ovate, slightly shorter than funicle, its basal segment setose. <i>Prothora.r</i> sub-pyriform, longer than broad, subapically constricted, subtruncate at base. <i>Scutelfom</i> visible, small. <i>Elytra</i> slightly broader than base of prothorax at humeri, subparallel-sided, regularly punctate-striate, 10-striate, tenth stria complete. <i>Wings</i> folly developed. <i>Legs</i> with clavate femora edentate, hind pair not reaching apex of second ventrite; tibiae not much longer than tarsi, compressed and expanded distally, fore pair angulate beyond middle below, strongly uncinate and mucronate; tarsi with second segment about as long as 3, 3 not bilobed, but slightly broader than 2, 4 slender and projecting beyond apex of 3 for a distance greater than length of 2 plus 3. <i>Stemmn</i> with ant~rior margins of fore coxae near transverse median axis of prosternum, intercoxal process slightly narrower than breadth of a coxa; mesosternum flat in front of intercoxal process which is slightly broader than breadth of a mesocoxa; metasternum between mid and hind coxae about as long as first two ventrites behind a coxa; metacoxae separated by about transverse diameter of a metacoxa; metepisternum distinct. <i>Venter</i> with intercoxal process of first ventrite arcuate; ventrites 1 and 2 fused, 1 about as long as 2 plus 3 at sides, 3 and 4 subequal, together slightly shorter than 2 and about as long as 5. Genotype: <i>Tyttho.r:ydema e.xilis,</i> new species. This genus is erected for a puzzling species, which, although havinga TODO 5-segmented funicle, should probably be placed in association with <i>O.xyde111a, Aphanocorynes,</i> and their allies. Sir Guy Marshall has describeda TODO genus <i>(Pento.r:ydema,</i> 1938) in the same group whichalsohas5 -segmenteclantennae. It was, however, erected for a large, different type of cossonid. This situation is similar to that of <i>Dryotribodes,</i> because <i>Tyttho.xydema</i> would be placed in a different subtribe from <i>Oxyde111a</i> according to the existing classification.
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 page 127, DOI: 10.5281/zenodo.5159964