Erysivena apta, Symonds & Cassis, 2018

Symonds, Celia L. & Cassis, Gerasimos, 2018, Systematics And Analysis Of The Radiation Of Orthotylini Plant Bugs Associated With Callitroid Conifers In Australia: Description Of Five New Genera And 32 New Species (Heteroptera: Miridae: Orthotylinae), Bulletin of the American Museum of Natural History 2018 (422), pp. 1-229 : 154-155

Erysivena apta , new species

Figures 14 , 49 , 74 ; map 4

DIAGNOSIS: Defined by the following characters: midsized; head enlarged anteriorly; eyes medium; labium extending over abdomen; tip of cuneus and forewing membrane veins red; pygophore with two tergal processes, left lateral tergal process bifurcate and U-shaped, right tergal process linear with an expanded lobed base; left paramere moderately expanded, sensory lobe angular and broad, apophysis elongate, with straight, unhooked apex; right paramere C-shaped, medial flange unexpanded, strongly curved apex and serrate from apex round to medial flange; aedeagus with all spicules unbranched and without medial processes; PES complex, weakly constricted above broad base, subdistally with few small serrations; DES2, curved downward distally; DES1 unbranched, bent in S-shape medially to apex, distally serrate; PES and DES2 joined right laterally with mem- brane; female mIRL subquadrate, two-thirds height of laIRL.

DESCRIPTION: Male: midsized, elongate, body length 3.53–3.84 mm, pronotal width 0.99–1.17 mm. COLORATION: Cuneus tip red; forewing membrane light gray-brown with darker patches laterally and in major cell, veins red with color extending onto surrounding membrane (fig. 14). VESTITURE: Dorsum with moderately dense distribution of lightbrown simple setae. STRUCTURE: Head: Strongly expanded anteriorly; eyes midsize, extending slightly beyond anterolateral angle of pronotum; antennae with A1 1.25× vertex width, AII 1.2× pronotal width; labium elongate, extending over abdomen. Hemelytra: Cuneus moderately elongate; major cell of membrane ovate-elongate, major membrane vein straight (parallel to inner margin of cuneus) (fig. 14). GENITALIA: Pygophore: Dorsal margin strongly concave, slightly asymmetrically, with two tergal processes; left lateral tergal process bifurcate, U-shaped with serrate margins; far right lateral tergal process linear, distally serrate with an expanded bulbous base; ventral margin of genital opening slightly concave with round cup-shaped phalloguide situated just inside and protruding over ventral margin; phalloguide with short, slightly sclerotized lobe ventrad to right paramere articulation (fig. 49A). Left paramere: Moderately expanded medially; sensory lobe broad, outer margin angular; apophysis greatly elongate, inner margin smooth; apex straight, not hooked (fig. 49B). Right paramere: C-shaped; medial flange on dorsal margin, unexpanded; apex enlarged and strongly curved to medial flange; medial flange unexpanded, with row of toothlike spines; apex with two rows of distinct tooth like spines, separated from medial spines (fig. 49C). Phallotheca: Dorsal opening large; round distally; weakly compressed on subapical ventral surface, with small tumescence in lateral view, but not flattened to crest; small lobe on right dorsal margin near base (fig. 49D). Aedeagus: Spicule arrangement (fig. 49): PES ventral to left lateral of and almost fully sheathing secondary gonopore, DES2 dorsal to PES and secondary gonopore, adjoining PES with membrane on right side of secondary gonopore (fig. 49G), DES1 dorsad of DES2, all originating near base of secondary gonopore; PES complex, slightly constricted above base, moderately narrow and tapering to apex; few serrations present on distal margin; without subbasal straplike processes or medial process (fig. 49E, F); DES2 unbranched, flattened, curved downward distally, without medial process (fig. 49E, F); DES1 simple, unbranched, not expanded medially, strong S-shaped bend medially to apex, distally serrate, with elongate basal keel (fig. 49F).

Female: Slightly smaller on average than males, body length 3.40–3.78 mm, pronotal width 1.01–1.06 mm. GENITALIA: IRS posterior margin medially convex. Interramal lobes (fig. 74): mIRL entirely separated from laIRL; laIRL curved inward and slightly tapered distally, base spiniferous with small spiniferous lobe; mIRL two-thirds height of laIRL, subquadrate, distally serrate.

ETYMOLOGY: Named in reference to the membrane joining PES and DES2, from the Latin aptus meaning “joined, bound, or fastened.”

HOST PLANT: From Callitris glaucophylla (table 2).

HOLOTYPE: AUSTRALIA: New South Wales: Gunningbland State Forest , 33.09222 ° S 147.9675 ° E, 08 Oct 1998, AM Terr. Ecol. Dept., Callitris glaucophylla , 1♂ ( AMNH _ PBI 00016270 ) ( AM).

PARATYPES: AUSTRALIA: New South Wales: Bulbodney State Forest, 32.515 ° S 147.201 ° E, 25 Sep 1997, AM Terr. Ecol. Dept., Callitris glaucophylla , 9♂ ( UNSW _ ENT 00041746 , UNSW _ ENT 00041748 , UNSW_ENT 00041749, UNSW_ENT 00041753– UNSW _ ENT 00041758 ), 9♀ ( UNSW _ ENT 00041750 , UNSW _ ENT 00041751 , UNSW_ENT 00041759– UNSW _ ENT 00041765 ) ( AM), 1♂ ( UNSW _ ENT 00041747 ), 1♀ ( UNSW _ ENT 00041752 ) ( UNSW). Gunningbland State Forest , 33.09694 ° S 147.95722 ° E, 18 Oct 1997, AM Terr. Ecol. Dept., Callitris glaucophylla , 1♂ ( AMNH _ PBI 00016268 ), 1♀ ( AMNH _ PBI 00016269 ) ( AM) ; 07 Oct 1998, AM Terr. Ecol. Dept., Callitris glaucophylla , 2♂ ( AMNH _ PBI 00016266 , AMNH _ PBI 00016267 ) ( AM). Gunningbland State Forest, 33.09222 ° S 147.9675 ° E, 08 Oct 1998, AM Terr. Ecol. Dept., Callitris glaucophylla , 2♀ ( AMNH _ PBI 00016271 , AMNH _ PBI 00016272 ) ( AM). Roadside remnant near Condobolin Tip, 33.07505 ° S 147.14466 ° E, 25 Sep 1997, Australian Museum, Callitris glaucophylla , 1♂ ( UNSW _ ENT 00041766 ) ( AM). Taratta State Forest , 32.8 ° S 147.03333 ° E, 25 Sep 1997, AM Terr. Ecol. Dept., Callitris glaucophylla , 2♂ ( UNSW _ ENT 00041767 , UNSW _ ENT 00041768 ) ( AM) .

DISTRIBUTION: Erysivena apta is known from five localities in central western New South Wales and is the only member of the genus that is narrowly restricted to this region (map 4). It was collected with B. hochuli and Callitricola cordylina and E. schuhi at four of the above localities (table 2).

REMARKS: Erysivena apta and E. schuhi have similar male genitalia, particularly PES, which is constricted above the base, but without subbasal processes (cf. figs. 49E, F and 69E). Males of E. apta are most easily distinguished from those of E. schuhi by the distinctive bifid left tergal process of the genital opening (cf. figs. 49A and 69A), the triangular left paramere with straight apophysis that is positioned inside the ventral margin of the pygophore at rest (cf. flexed over pygophore venter at rest in E. schuhi ) (figs. 49B, 69B), and the unexpanded right paramere (cf. figs. 49C and 69C). Where E. apta has been collected sympatrically with E. schuhi females are unable to be distinguished without dissection. See also remarks for E. schuhi .

Figures

FIG. 14. Erysivena species, dorsal habitus photographs of males. Scale bar = 1 mm.

FIG. 49. Male genitalia of Erysivena apta. A. Pygophore, dorsal, detail of left tergal process in lateral view. B. Left paramere, dorsal. C. Right paramere, left dorsolateral. D. Phallotheca, dorsal. E. Aedeagus, left lateral. F. Aedeagus, right lateral. Scale bars = 0.1 mm.

FIG. 74. Erysivena female genitalia: right interramal lobes of species, posterior wall of E. schuhi, dorsal. Scale bar = 0.1 mm.