Ommatides tridentis, Hoey-Chamberlain & Weirauch, 2019

Hoey-Chamberlain, Rochelle & Weirauch, Christiane, 2019, Taxonomic revision of the New World big-eyed minute litter bug genus Ommatides Uhler (Hemiptera: Schizopteridae), Zootaxa 4585 (1), pp. 73-99 : 89-90

Ommatides tridentis sp. nov.

Figures 1–3 , 5–7 , 9

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Material. Type material. Holotype, male slide-mounted in Canada balsam, TRINIDAD AND TOBAGO: Trinidad : Saint George Co.: Tacarigua , Mt. St. Benedict, 10.6669°N 61.3811°W, 379m, 17 Jul 2013 – 18 Jul 2013, J.

Heraty, A. Baker, (ED_1541) (UCR_ENT 00082287) (UCR); Paratype: TRINIDAD AND TOBAGO: Trinidad: Saint George Co.: Tacarigua, Mt. St. Benedict, 10.6669°N 61.3811°W, 379m, 18 Jul 2013 – 19 Jul 2013, C. Weirauch, 1 female slide-mounted in Canada balsam (ED_2643) (UCR_ENT 00088667) (UCR). COLOMBIA: Magdalena: PNN Tayrona Zaino, 11.33333°N 74.03333°W, 198m, 50 m, 0 4 Dec 2000 – 15 Dec 2000, R. Henriquez, 1 female slide-mounted in Canada balsam (ED_819) (UCR_ENT 00077426) (IAvH).

Diagnosis. Recognized among species of Ommatides by males macropterous with long membrane reaching well past abdomen and females macropterous with small membrane not quite reaching past abdomen; the males with dorsal lobes of expanded 1st labial segment extremely enlarged and with many short, stout setae (~26 short and black, ~12 longer and brown); 4th labial segment with pairs of proximal and distal processes, proximal pair with bifid apex, with proximal branch straight and distal branch curved, and distal pair small and slightly tapered; 3rd labial segment reduced to small sclerite on dorsal surface of labium; males with spiracle 8 set upon membranous tubercle of tergum 8 process. Most similar to O. duodentis sp. nov. and O. ornatus in having elaborate armature on labial segment 4, but distinguished by proximal processes of 4th labial segment strongly curved, apices pointing proximad.

Description. Male: macropterous with large membrane reaching well past abdomen; total length: 2.03 mm; body length: 1.68mm; body elongate ovoid. COLORATION: wings light to dark brown, with light stripe between costa and clavus; pronotum and scutellum black; head, ventral surface of thorax, and abdomen dark brown; 1st and 2nd labial segments yellow; 3rd labial segment tan; tip of 4th labial segment black; legs yellow with brown patches on coxae and tarsi ( Figs 1 , 2 ). SURFACE AND VESTITURE: lobes of dorsally expanded bilobed 1st labial segment with many short, stout setae (26(short black)/ 12 (longer brown- on backside of inner surface); forefemur anteriorly with row of 5 spicules; 2nd tarsomere of hind leg with 2 stout setae anteroventrally. STRUCTURE. HEAD: disc declivous; 1st labial segment extremely expanded dorsally ( Figs 2 , 3 , 5 ); 3rd labial segment represented by small dorsal sclerite; 2 pairs of processes on 4th labial segment with pairs of proximal and distal, proximal pair curved and with bifid apex, with proximal branch straight and distal branch curved; distal pair of processes short. THORAX: ratio of pronotal collar length to pronotum length 0.21; collar depressed below rest of pronotum ( Fig. 1 ); posterolateral margin of pronotum narrowly and shallowly concave; postnotum rounded; ratio of height to length of forefemur 0.26; tarsal formula 3-3-3; ratio of length of hind tibia to width of pronotum 1.03; venation of macropterous forewing as in Fig. 8 ; tc very flattened pentagonal; dc forming long rectangle; An1 meets Cu. ABDOMEN AND GENITALIA: as in genus description ( Fig. 9 AB), with spiracle 8 set upon membranous tubercle of tergum 8 process ( Fig. 6 ).

Female: macropterous with small membrane not quite reaching past abdomen; total length: 1.49–1.97 mm; body length: 1.42–1.94 mm; body elongate ovoid. COLORATION: wings light to dark brown, with light stripe between costa and clavus; pronotum and scutellum black; head and body brown; labial segments yellow, except tip of 4th segments black; legs yellow with brown patches on coxae and tarsi ( Fig. 1 ). SURFACE AND VESTITURE: labium as in generic description; forefemur without anterior spicules; 2nd tarsomere of hind leg with 2 stout setae anteroventrally. STRUCTURE. HEAD: as in generic description. THORAX: ratio of pronotal collar length to pronotum length 0.17–0.23; collar depressed below rest of pronotum ( Fig. 1 ); posterolateral margin of pronotum narrowly and shallowly concave; postnotum rounded (almost bilobed); ratio of height to length of forefemur 0.23– 0.24; tarsal formula 2-2-3; ratio of length of hind tibia to width of pronotum 1.04–1.37; venation of macropterous forewing as in male, except membrane is much reduced. ABDOMEN AND GENITALIA: as in genus description ( Fig. 9 C,D ), except gonoplacs with large lobes slightly pointed on inner edges.

Discussion. The female specimen from Colombia is associated with this species due to its close similarity to the only other female specimen of this species, including large gonoplacs with slightly pointed inner edges.

Etymology. After Latin noun “dens, dentis” meaning tooth and the prefix “tri-“ from Latin “tres” meaning three. Named for the tripartite appearance of the tip of the labium in lateral view ( Fig. 2 ), due to the heavily sclerotized tip of the labium and the bifurcated proximal and and unbifurcated distal processes.

Distribution. Known from the Northern Range in Trinidad, where specimens were collected at the intersection between rainforest and grassland, and from the Caribbean coast in Colombia.

Macrohabitat and Collecting method: Tropical rainforest edge; Yellow Pan Trap.

Figures

FIGURE 1. Dorsal habitus images of Ommatides spp. males and females.

FIGURE 2. Lateral habitus images of Ommatides spp. males and females. Black arrows pointing our 4th labial segment processes (O. duodentis male, O. tridentis male) and sparse setation of foretibia (O. nudus male)

FIGURE 3. Ventral habitus images of Ommatides males and females. Black arrow pointing our 4th labial segment processes (O. duodentis male).

FIGURE 5. Labial structures of Ommatides spp. males in frontal view. Shading indicating degree of sclerotization. bubuccula; ca—conjunctival appendage; cly—clypeus; els—enlarged labial segment; mdpl—mandibular plate; mxpl—maxillary plate; proc—process; set—setae; spn—spine

FIGURE 6. Male genitalia of Ommatides spp.in dorsal view. Arrow indicating location of (or estimation of) abdominal spiracle 8 on tergum 8 process. ano—anophore; anop—anophoric appendage; at—anal tube; ca—conjunctival appendage; lpleft paramere; rp—right paramere; s9—sternum 9; t8—tergum 8; t8p—tergum 8 process; v—vesica.

FIGURE 7. Forewing of Ommatides spp. for males of all and females of selected species. An1—1st anal vein; An2—2nd anal vein; ac—anal cell; bc basal cell; Cu—cubital vein; cub—cubital cell; dc—discal cell; M—media; R—radius; R1—1st branch of radius; R2—2nd branch of radius; R3—3rd branch of radius; rc1-3—radial cells along costal margin; Sc—subcosta; sccsubcostal cell; tc—trapezoidal cell; wc—wing coupling organ.

FIGURE 8. Forewing of Ommatides spp. for males of all and females of selected species. An1—1st anal vein; An2—2nd anal vein; ac—anal cell; bc—basal cell; Cu—cubital vein; cub—cubital cell; dc—discal cell; M—media; R—radius; R1—1st branch of radius; R2—2nd branch of radius; R3—3rd branch of radius; rc1-3—radial cells along costal margin; Sc—subcosta; scc—subcostal cell; tc—trapezoidal cell; wc—wing coupling organ.

FIGURE 9. Male and female genitalic features of selected species of Ommatides. (A) Ommatides duodentis sp. nov.: male genitalia in dorsal perspective (ED_3548; UCR_ENT 00100847); (B) Ommatides nudus sp. nov.: male genitalia in ventral perspective (ED_3542; UCR_ENT 00025951); (C) Ommatides parvidentis sp. nov.: female genitalia in dorsal perspective (ED_4109; UCR_ENT 00098890); (D) Ommatides nudus sp. nov.: female genitalia in lateral perspective (ED_3543; UCR_ENT 00025952). ano—anophore; anop—anophoric appendage; ag—anterior gonapophysis; at—anal tube; caconjunctival appendage; g—gonoplacs; lp—left paramere; pg—posterior gonapophysis; rp—right paramere; s7—sternum 7; s8—sternum 8; s9—sternum 9; spgd—spermathecal gland duct; spgl—spermathecal gland; spr—spermathecal reservoir; spth—spermatheca; st—styloid; t 7, 8, 9—tergum 7, 8, 9; t8p—tergum 8 process; t10—tergum 10; t10p—process of tergum 10; v—vesica.