Aradidae

Contreras, Eugenia Fernanda & Coscarón, María Del Carmen, 2012, The Aradidae (Insecta, Hemiptera, Heteroptera) of Argentina, Zootaxa 3500, pp. 1-35 : 2

Key to subfamilies of Argentinian Aradidae

1. Mandibular plates produced anteriorly to exceed apex of clypeus, forming a cleft or emarginate anterior margin of head ( Fig 5 D); first dorsal abdominal scent-gland orifice (or scar thereof) large, usually strongly displaced posteriorly, second orifice rarely well developed, third always obsolete or undifferentiated................................................ 2

1’. Mandibular plates not produced anteriorly to exceed apex of clypeus, head not appearing cleft or emarginate anteriorly ( Fig 3 B); 3 dorsal abdominal scent-gland orifices (or scar thereof), equal in size, not displaced posteriorly.................. 3

2. Labium arising from open area of bucculae (“open atrium”) ( Fig 2 B); anterior dorsal abdominal scent-gland orifice, or scar, not or only slightly displaced posteriorly.......................... Aneurinae Douglas and Scott ( Figs 2 A–D, 3A–B)

2’. Labium arising from nearly closed area of bucculae (“closed atrium”) ( Fig 8 A) opening of first dorsal abdominal scent-gland orifice (or scar) displaced posteriorly to middle or posterior margin of segment 4................................... 4

3. Labium arising at or near apex of clypeus; base of labium free and exposed ( Fig 4 D). Forewings with line of weakness at level of apex of scutellum and often broken off at this level................................ Isoderminae Stål ( Figs 4 C–D)

3’. Labium arising well behind apex of clypeus; base of labium bordered by well-developed bucculae, wings lacking a line of weakness at level of apex of scutellum.................................................................... 5

4. Metathoracic scent-gland orifices with a well-developed, usually channel-like, evaporatory area extending to lateral margin of thoracic metapleuron; body usually not incrustate above................................................................................................... Mezirinae Oshanin ( Figs 5 A–D, 6A–D, 7A–D, 8A–D, 9A–D, 10A–B)

4’. Metathoracic scent-gland orifices absent; evaporatory area indistinct. Body sometimes with incrustations above.......... 5

5. Scutellum greatly enlarged, covering all but narrow margins of abdominal disk inside of connexival sutures. Hemielytra completely hidden and membranous, except for thickened costal margins wich are exposed at edges of basal half of scutellum. Edge of connexivum double.................................................................. Calisiinae Stål

5’. Scutellum much smaller, usually triangular, never covering only a small part of abdominal disk. Hemielytra variously developed but completely exposed, usually with costal margins dilated at base..................................................................................................... Aradinae Amyot and Serville ( Figs 3 C–D, 4A–B)

Figures

FIGURE 2. Subfamily Aneurinae. Dorsal view, scutellum triangular Aneurosoma dissimile: A; “ Open atrium ” Aneurosoma dissimile: B; Dorsal view Aneurus bosqui: C; Dorsal view and scutellum semicircular Iralunelus bergi: D.

FIGURE 3. Subfamilies Aneurinae and Aradinae. Dorsal view and postocular tubercles Iralunelus monrosi: A; Dorsal view, mandibular plates and triangular paratergite Iralunelus subdipterus: B; Dorsal view Aradus angustellus: C; Dorsal view Aradus brasiliensis: D.

FIGURE 4. Subfamily Aradinae and Isoderminae. Dorsal view Aradus mexicanus: A; Dorsal view Aradus penningtoni: B; Dorsal view and forewings with line of weakness Isodermus gayi: C; Base of labium free and exposed Isodermus gayi: D.

FIGURE 5. Subfamily Mezirinae: Dorsal view Aphleboderrhis pilosa: A; Dorsal view, pronotum laterally expanded lobes broad and abdomen broadly rounded Dysodius lunatus: B; Dorsal view and genae wide Lobocara oblonga: C; Dorsal view and mandibular plates produced anteriorly Mezira americana: D.

FIGURE 8. Subfamily Mezirinae: Female genitalia Mezira regularis: A; Dorsal view and male pyghopore Mezira saltensis: B; “ Close atrium ” Mezira saltensis: C; Dorsal view Mezira tartagalensis: D.