Hypselosomops, Hoey-Chamberlain, Rochelle & Weirauch, Christiane, 2016

Hoey-Chamberlain, Rochelle & Weirauch, Christiane, 2016, Two new genera of big-eyed minute litter bugs (Hemiptera, Schizopteridae, Hypselosomatinae) from Brazil and the Caribbean, ZooKeys 640, pp. 79-102 : 85-88

Hypselosomops gen. n. Figures 2, 3, 4, 5, 6, 7

Type species.

Hypselosomops pecki sp. n.

Diagnosis.

Distinguished among Hypselosomatinae by males with two wing morphs (macropterous and submacropterous); slightly enlarged and dorsally expanded first labial segment lacking anterior “teeth-like” setae (Fig. 5D); third and fourth labial segments distinctly separated (Fig. 5D); clypeus without macrosetae but with medial apical indentation with small basal flap and a row of five small setae at apex (Fig. 5C); large seta with strongly expanded apex originating dorsoapically on third tarsal segment of all legs; tergite eight with bipartite process on left side (Fig. 4A, D); two conjunctival appendages at base of vesica (Fig. 4A, B). Most similar among New World Hypselosomatinae to Ommatides in coloration (Fig. 12). Among Old World hypselosomatine genera similar to Duonota and Rectilamina ( Hill 1984), with which it shares the absence of clypeal macrosetae in males and the presence of three clypeal macrosetae in females, as well as the modifications of tergite eight in males and the presence and shape of the spermatheca in females. Distinguished from all hypselosomatine genera by the structure of the clypeus and the process of tergite eight.

Description.

Male. Coloration. Head, thorax, abdomen ventrally, and forewing light to dark brown, with pale transverse band proximally on forewing; legs yellow, coxae brown; abdomen dorsally pale; genital capsule and genitalia light to dark brown. Surface and Vestiture. Clypeus without macrosetae, with a depression in apical half and a row of five small setae at apex; buccula and first labial segment each with a pair of stout ventrolateral macrosetae; second labial segment with pair of lateral macrosetae (Fig. 5C); first antennal segment with five setae; ratio of length of third antennal segment and fourth antennal segment approximately 0.93; fore femur without anterior macroseta; hind tibia with four erect medium-length macrosetae ventrally on distal half; second tarsomere of hind leg with one macroseta anteroventrally (Fig. 5B); projections on left side of tergite eight with distinctive spines at apices, anteriormost process of tergite eight with simple spines, posterior process of tergite eight with spines with differentiated bases; anophore without distinctive setae (Fig. 5H). Structure. First labial segment slightly enlarged, with small frontally converging lobes (Fig. 5C, D); clypeus with medial apical indentation with small basal flap (Fig. 5C); ratio of pronotal collar length to pronotum length 0.23 (macropterous male), 0.28 (submacropterous male); disc steeply declivous, not decurrent anteriorly; collar slightly depressed below pronotum (Fig. 2); postnotum subrectangular (i.e. the freely projecting portion is straight along most of the posterior margin, curving only laterally, as in Rectilamina Hill); ratio of height of fore femora to length of fore femora 0.25 in macropterous and submacropterous morph; tarsal formula 2-3-3; large seta with strongly expanded apex originating dorsoapically on third tarsal segment of all legs; pretarsus with two long, thin parempodia with slightly expanded and flattened apex; inflated arolium absent (Fig. 5B, E, F); ratio of length of hind tibia to width of pronotum 1.00 (macropterous), 1.11 (submacropterous); fore wing polymorphic (macropterous or submacropterous); wing venation as in Fig. 3A, C, D; trapezoidal cell variable; discal cell elongate rectangular; in macropterous form first anal vein not meeting cubitus, in submacropterous form first anal vein meeting cubitus forming cubital cell; macropterous form with full length hind wing, submacropterous form with greatly reduced hind wing; abdomen with two pairs of spiracles (on sternites seven and eight). Genitalia. Posterior margin of sternite seven simple, very slightly asymmetrical (Fig. 4C); right side of tergite eight with small projection, left side with two projections (one short and semi-triangular, and one long, slender and curving dorsad), each with distinctive spines on apices (Fig. 4A, D); sternite eight free of sternite seven and with nearly medial triangular lobe (Fig. 4C); anophoric process long, thick and curving dorsally but without articulations (Fig. 4A); right paramere mitten-shaped with short process at base forming a “thumb”; left paramere scapula-shaped with a large thumb-shaped projection (Fig. 4A, B); vesica of average length with two bends, and two conjunctival appendages at base, one long and pointed, the other shorter and pointed and with a 90 degree bend just before the point (Fig. 4A, B).

Female. Coloration. Similar to male. Surface and Vestiture. First antennal segment with five macrosetae; ratio of third antennal segment and fourth antennal segment approximately 0.93; clypeus not inflated with three (two basal, one at tip) macrosetae; second labial segment with pair of lateral macrosetae, buccula with pair of lateral macrosetae (Fig. 7A, D); fore femur without anterior macroseta; hind tibia with four erect medium-length macrosetae ventrally on distal half; second hind tarsomere with one macroseta anteroventrally (Fig. 7G); sternite with narrow U-shaped shiny area reaching about 1/3 towards anterior margin (Fig. 2). Structure. Similar to male, but ratio of pronotal collar length to pronotum length 0.18; disc steeply declivous, not decurrent anteriorly; collar slightly depressed below pronotum (Fig. 2); postnotum short and rectangular; ratio of height of fore femora to length of fore femora 0.29; tarsal formula 2-2-3; pretarsus as in male: ratio of length of hind tibia to width of pronotum 1.03; submacropterous; wing venation as in Fig. 3; discal cell elongate rectangular; first anal vein meeting cubitus to form cubital cell; hind wing lacking; tergite eight without posterolateral projections (Fig. 4E, G); abdomen with two pairs of spiracles (on tergite seven and sternite eight). Genitalia. Anterior gonapophysis with three teeth, no subapical serration (Fig. 4E, G, H); posterior gonapophysis with two teeth (Fig. 4E, G, H); median styloid bifurcate (Fig. 4F); gonoplacs round apically (Fig. 4F); spermathecal gland spherical; spermathecal gland duct straight; spermathecal reservoir globular with two bends; spermathecal duct long and straight (Fig. 4I).

Nymphs: For habitus and size of first, second, fourth, and fifth instar nymphs, see Fig. 2 and Table 1.

Etymology.

" Hypselosom " from Hypselosoma , the type genus of Hypselosomatinae, and “ops” which is Greek for "having the appearance of", due to the similarity of this genus to Hypselosoma . The gender is feminine.

Notes.

The medial apical indentation with small basal flap on the clypeus (Fig. 5C) is a unique character, the likes of which have been described in only one other species, Hypselosoma oncerochilotum Hill, from Queensland, Australia ( Hill 1987). We suspect that this feature may be associated with an organ of unknown function, however, histological studies would be required to confirm this hypothesis. Also the large seta with strongly expanded apex originating dorsoapically on the third tarsal segment of all legs is a distinctive character similar to the larger dorsal seta on the apical tarsomeres in Silhouettanus Hill ( Hill 2014).

Distribution.

Specimens of this genus have been collected in Cuba and the Dominican Republic.