Acanthosomatidae

Dellapé, Gimena, 2016, Synopsis of the Acanthosomatidae (Heteroptera) from Argentina, Revista de la Sociedad Entomológica Argentina 75, No. 1 - 2, pp. 81-90 : 82-84

Key to the genera of Acanthosomatidae from Argentina (modified from Rolston & Kumar, 1974 and Schwertner & Grazia, 2015).

1- Median tubercle or spine present at base of abdominal venter ........................................ 8 1’- Base of abdominal venter smoothly convex, without a tubercle or spine ................................ 2

2- Distal end of first antennal segment clearly surpassing the apex of head ......................... 3 2’- Distal end of first antennal segment reaching little if any beyond the apex of head …........ 6

3- Longitudinal sulcus of prosternum before coxae as deep as the diameter of rostrum, or little wider; the distal diameter of first antennal segment usually about twice its basal diameter .......................................... CylindrOCnema Mayr 3’- Longitudinal sulcus of prosternum absent or much broader than the diameter of rostrum; first antennal segment subcylindrical ................ 4

4- Length of first antennal segment more than 4/5 the length of head in dorsal view ............................... PlanOiS Signoret ( Fig. 14) 4’- Length of first antennal segment less than 3/5 the length of head in dorsal view .............. 5

5- Prosternum shallowly depressed lengthwise; humeral angles developed ....................... ................................................ NOpaliS Signoret 5’- Prosternum transversely convex; humeral angles not developed ....................................... ........................ DitOmOtarSuS Spinola ( Fig. 11)

6- Juga surpassing the tylus, usually contiguous before the tylus ................................... 7 6’- Juga not or scarcely surpassing the tylus, never contiguous ........ HyperbiuS Stål ( Fig. 12)

7- Anterior preocular part of head strongly deflexed; hemelytra not covering the entire abdominal dorsum; measuring 8-10 mm ................. MazanOma Rolston & Kumar ( Fig. 13) 7’- Anterior preocular part of head not strongly deflexed; hemelytra covering the abdominal dorsum; measuring 5-6 mm ............................. ........................................ ROlStOnuS Froeschner

8- Abdominal spine long, surpassing procoxae ...................................… BebaeuS Dallas 8’- Abdominal spine shorter ....................… 9

9- Juga contiguous before the tylus ............ ............................................... SniplOa Signoret 9’- Juga not surpassing the tylus or, if longer than the tylus, neither markedly convergent nor contiguous ..................................................... 10

10- Ostiolar peritreme extending much farther than halfway from the inner margin of the ostiole to the lateral margin of the metapleuron ..... .................................................... PhOrbanta Stål 10’- Ostiolar peritreme extending halfway or lessfromtheinnermarginoftheostioletothelateral margin of the metapleuron ............................. 11

11- Ostiolar peritreme reaching halfway from the inner margin of the ostiole to the lateral margin of the metapleuron ............ LanOpiS Signoret 11’- Ostiolar peritreme reaching not more than one-third distance from the inner margin of the ostiole to the lateral margin of the metapleuron .... 12

12- Base of abdominal venter tuberculate, tubercle not or scarcely surpassing the posterior margin of the metasternum ............................ 13 12’- Spine at base of abdominal venter clearly extending onto the metasternum ..................... 14

13- Apex of head broad; tylus and juga apically rounded; sides of head scarcely concave before the eyes ..................... Ea Distant ( Fig. 3) 13’- Apex of the head forming narrow smooth parabola, sides distinctly concave before the eyes ....................... ACrOphyma Bergroth ( Fig. 2)

14- First antennal segment reaching or slightly surpassing the apex of head; mesosternum weakly carinate ....... SinOpla Signoret ( Figs.9-10) 14’- First antennal segment not reaching the apex of head; mesosternum not carinate ....... ..................................... HelliCa Stål ( Figs. 4-6)