Schizopteridae Reuter 1891
Creators: name: Weirauch, Christiane
name: Whorrall, Kyle
name: Knyshov, Alexander
name: Hoey-Chamberlain, Rochelle
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Schizopteridae

description: Key to New World Schizopteridae
1 Forewing with four closed submarginal cells (Fig. 1A, black arrows); eyes relatively large, head wider than prothorax (Fig. 1A); labium four-segmented; male sternum VIII well-developed; ovipositor well-developed............................. Hypselosomatinae (Williamsocoris Carpintero and Dellapé, Glyptocombus Heidemann, Ommatides Uhler, Hypselosomops Hoey-Chamberlain and Weirauch, Hypsohapsis Hoey-Chamberlain and Weirauch)
- Forewing with less than four closed submarginal cells (Fig. 1B, black arrows); eyes smaller, head not noticeably wider than prothorax (Fig. 1B); labium three- or four-segmented; male sternum VIII reduced, fused with pygophore; ovipositor welldeveloped or obsolete................................................................................. 2
2 Labium four-segmented (Fig. 1C)........................................................................ 3
- Labium three-segmented (Fig. 1D)...................................................................... 6
3 The basal half of the forewing with a deep costal fracture (Fig. 1E, black arrow)............................................................................................ Guapinannus Wygodzinsky and Tropistotrochus Reuter
- The basal half of the forewing without a deep costal fracture (Fig. 1B, F, K)...................................... 4
4 Eyes large, about 2/3 as wide as synthlipsis; basal cell of the forewing much smaller than trapezoidal cell, or if larger then only three veins excluding claval veins emanate from trapezoidal cell; veins are often traced by areoles (Fig. 1F); tarsal formula 2- 2-3 in both sexes.............................................................. Peloridinannus Wygodzinsky
- Eyes small, about 1/3 or less as wide as synthlipsis; basal cell of the forewing larger or equal to trapezoidal cell; four to five veins excluding claval veins emanate from trapezoidal cell; veins are not traced by areoles; tarsal formula different...... 5
5 Labium straight and long, extending beyond hind coxa (Fig. 1G, black arrow); tarsal formula 3-3- 2 in males, 2-2- 2 in females; body size <1.3 mm; ovipositor vestigial............................................... Chinannus Wygodzinsky
- Labium short, not surpassing middle coxa (Fig. 2F); tarsal formula 3-3- 3 in males, 2- 2-3 in females; total size> 2 mm; ovipositor well-developed (Fig. 9B)........................................................... Meganannus, n. gen.
6 Labium truncated (Fig. 1D, white arrow); pronotal collar absent (Fig. 1I, white arrow)..................................... Corixidea genus group (Corixidea Reuter, Hoplonannus McAtee and Malloch, Membracioides McAtee and Malloch, Oncerodes Uhler, Voccoroda Wygodzinsky, Voragocoris Weirauch)
- Labium tapering (Fig. 1C, white arrow; 1G, black arrow); pronotal collar usually present (Fig. 1K, grey arrow).......... 7
7 Cu-vein on male forewing thickened and darkened (see Fig. 44 in Wygodzinsky 1948); macropterous, 1AN vein on forewing merges with Cu distally; right side of the male sternum IV with a hook..................... Itagunannus Wygodzinsky
- Cu-vein on male forewing not thickened and darkened; in macropterous specimens 1AN disappearing before reaching any other vein or forewing margin (Fig. 1B, white arrow); right side of male sternum IV without a hook................... 8
8 Posterolateral spine on metepisternum well developed (Fig. 1H, white arrow); radial (= posterior costal) cell pentagonal or quadrate (Fig. 1B, grey arrow), considerably smaller than anterior costal cell, distal R-vein straight......................
. the Schizoptera genus group (Ceratocomboides McAtee and Malloch, Ptenidiophyes Reuter, Schizoptera Fieber, Orthorhagus McAtee and Malloch, Kophaegis McAtee and Malloch) - Posterolateral spine on metepisternum absent (Fig. 1K, white arrow); radial (= posterior costal) cell elongate (Fig. 1J, black arrow), slightly smaller than anterior costal cell, distal part of R-vein curved...................................... 9
9 Head moderately to greatly elongated (Fig. 1K), but without frontal projection; labium very slender, curved dorsad at apex, second labial segment much longer than first and third combined (Fig. 1K, black arrow); basal and discoidal cells separate (Fig. 1J, grey arrows).......................................... Nannocoris Reuter and Soekhnandanius Makhan
- Head not elongated, but with a frontal projection bearing three stout setae (see Fig. 2 in: Wygodzinsky 1947); labium moderately slender, not curved dorsad at apex, second labial segment roughly as long as either first or third; basal and discoidal cells merged (see Fig. 1 in: Wygodzinsky 1947)........................................... Biturunannus Wygodzinsky
description: Published as part of Weirauch, Christiane, Whorrall, Kyle, Knyshov, Alexander & Hoey-Chamberlain, Rochelle, 2018, Giant among dwarfs: Meganannus lewisi, gen. n. and sp. n., a new genus and species of minute litter bugs from Costa Rica (Hemiptera: Schizopteridae), pp. 156-170 in Zootaxa 4370 (2) on pages 158-159, DOI: 10.11646/zootaxa.4370.2.4, http://zenodo.org/record/1143899