Tessaratomina Stal 1865
Creators: name: Magnien, Philippe
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Tessaratomidae

description: Key to genera of the sub-tribe Tessaratomina
The present key is an adaptation of the one given by Kumar & Ghauri (1970), together with a complete diagnosis of Tessaratomina. Apart from the inclusion of the two new genera, the modifications are as follows: suppression of Amissus, as being not a true Tessaratomina (Magnien, 2018), addition of Enada, which has been overlooked by them, correction of concave/convex inversion in their original key, change of the character used to isolate Siphnus (head instead of pronotum) and addition of a secondary character to insure the correct inclusion of Embolosterna vaccca Martin, 1902. For illustration of this key, readers may access pictures of all Tessaratomina genera in the online catalog (Magnien, 2023).
1 Posterior margin of pronotum straight or concave, if slightly convex then humeral processes not spined; humeral processes normally blunt, if sharply pointed then specimens always chocolate in colour...................................... 2
– Posterior margin of pronotum convex, exceptionally with a small median concavity; if posterior margin straight or slightly concave medially then humeral processes produced into long sharp pointed spines; spined specimens pale green or hazy green but never chocolate in colour............................................................................ 9
2 Free projecting part of sternal processus not or only slightly flattened laterally, generally round, never absent............ 3
– Free projecting part of sternal processus greatly flattened laterally, if free projecting part absent then raised portion of processus in contact with mesosternum always flattened laterally........................................................ 6
3 Antennae length half or more than half of habitus length...................................................... 4
– Antennae length less than half of habitus length............................................................. 5
4 Underside dark brown, ♂ posterior angles of pygophore strongly produced, ♀ distal spermathecal duct deprived of striated dilation.............................................................................. Homoiacoris n. gn.
– Underside light brown, ♂ posterior angles of pygophore not produced, ♀ distal spermathecal duct fitted with a more or less swollen longitudinally striated dilation..................................................... Oukhypencha n. gn.
5 Head width great, at least one third of pronotum width............................................... Siphnus Stål
– Head width smaller, about one quarter of pronotum width......................................... Acidosterna Stål
6 Length of free part of sternal processus equal to, greater than or slightly less than length in contact with sterna............................................................................. Hypencha Amyot & Serville
– Free part of sternal processus reduced, always less than length in contact......................................... 7
7 Postero-lateral margins of segment 7 produced backwards into long flat and apically furcate processes; scutellum long, extending well onto membrane of forewing and gradually tapering apically.......................... Mucanum Amyot & Serville
– Postero-lateral margins of segment 7 not or slightly produced, the latter never furcate apically, scutellum not or slightly extending onto membrane, never gradually tapering posteriorly................................................. 8
8 Humeral processus conspicuous, if not then apex of scutellum with a large yellow spot................ Embolosterna Stål
– Humerus rounded, not produced, apex of scutellum concolorous............................... Tessaratoma Berthold
9 Width of pronotum at least equal and often much greater than that of abdomen, taken at level of 4th abdominal segment........................................................................................... Pygoplatys Dallas
– Width of pronotum at most 90 % of that of abdomen............................................... Enada Walker
description: Published as part of Magnien, Philippe, 2023, New genera, species and subspecies of tessaratomine true bugs (Heteroptera: Tessaratomidae, Tessaratominae), pp. 533-549 in Zootaxa 5375 (4) on pages 547-548, DOI: 10.11646/zootaxa.5375.4.5, http://zenodo.org/record/10202772