Felisacus curvatus Hu and Zheng, 2001

Namyatova, Anna A. & Cassis, Gerasimos, 2016, Revision And Phylogeny Of The Fern-Inhabiting Genus Felisacus Distant (Insecta: Heteroptera: Miridae: Bryocorinae) Anna A. Namyatova And Gerasimos Cassis, Bulletin of the American Museum of Natural History 2016 (403), pp. 1-169 : 70-74

Felisacus curvatus Hu and Zheng, 2001

Figures 4 , 10E , 11V, W , 14J , 16L, M , 18

Felisacus curvatus Hu and Zheng, 2001: 417 (original description).

DIAGNOSIS: Recognized by the following combination of characters: marking along inner margin of corium brown, with anterior part not reaching R+M not widened, and posterior part reaching R+M and noticeably widened (fig. 4); depression delimiting occipital region distinct only dorsally; segment I cylindrical (as in Namyatova et al., 2016: fig. 8A); head and pronotum yellow to pale brown; right paramere sickle shaped, with outer angle rounded and inner angle distinct, without outgrowth (fig. 11V); sclerotization of ductus seminis around secondary gonopore short, twice as long as wide; vesica with three serrate spicules, bearing toothlike outgrowths (fig. 10E).

DESCRIPTION: Male. Total length 4.2–4.8. COLORATION (fig. 4): Head: Mainly yellow to pale brown, with reddish tinge; buccula, tubercle around eye, marking below antennal fossa, mandibular and maxillary plates whitish yellow; clypeus brown apically. Eye dark brown with reddish tinge. Labium: Whitish yellow to yellow. Antenna: Segment I whitish yellow to yellow, reddish apically, sometimes uniformly whitish yellow; segment II yellow basally and pale brown to brown apically, sometimes uniformly pale brown to brown; segments II–IV pale brown to brown. Thorax: Anterior part of pronotum yellow to pale brown with anterior margin brown, often with reddish tinge; posterior part of pronotum often yellow to pale brown often with humeral angle brown, rarely posterior part of pronotum uniformly dark brown; mesoscutum yellow to pale brown, rarely with reddish tinge, sometimes with brown marking medially, rarely uniformly brown to dark brown; scutellum yellow to pale brown, rarely with reddish tinge; rarely brown to dark brown; thoracic pleura pale brown to dark brown; scent gland evaporative area whitish yellow basally and brown apically. Hemelytron: Mostly translucent and colorless, clavus opaque; inner part of clavus pale brown to brown, sometimes with reddish tinge; outer part of clavus, brown, often darker than inner part; marking along inner margin of corium reddish brown or brown; its anterior part very short not reaching R+M and posterior part reaching R+M, twice as wide as middle part; embolium brown basally, often yellow to pale brown apically with margins partly pale brown to brown; cuneus reddish or reddish brown apically; membrane pale brown to brown; membrane cell brown, often with reddish tinge. Legs: Coxae whitish yellow, femora whitish yellow basally and yellow apically, sometimes with reddish tinge apically; hind and middle tibiae sometimes with reddish-brown marking on apical half; tibiae whitish yellow to yellow, sometimes with reddish tinge basally; tarsi whitish yellow to yellow. Abdomen: Whitish yellow to yellow ventrally and laterally, genital capsule pale brown, striped laterally and dorsal surface reddish, rarely abdomen uniformly reddish. SURFACE AND VESTI- TURE: Corium smooth, with rare and shallow punctation. Dorsum and femora with setae distinctly longer than antennal segment II diameter; antennal segment I clothed with suberect setae subequal to or slightly longer than antennal segment II diameter; abdomen clothed with short erect setae. STRUCTURE AND MEASURE- MENTS: Body 4.2–4.6× as long as pronotum width. Head: Depression, delimiting occipital region, present only dorsally; distance between depression and pronotum as long as eye diameter; longitudinal sulcus on vertex shorter than eye diameter; distance from eye to pronotum distinctly longer than eye diameter, not swollen; vertex ca. 1.7–2.2× as wide as eye, flat (as in fig. 7E). Labium: Slightly surpassing posterior margin of prosternum; segment I twice as long as than wide, segment II slightly longer than wide, its dorsal surface not elongate posteriorly (as in Namyatova et al., 2016: fig. 6E); segments I and II combined almost subequal to segment III; segment III shorter than ventral side of head, segment IV ca. 1.5× as long as segment III. Antenna: Segment I cylindrical (as in Namyatova et al., 2016: fig. 8A), ca. 1.4–1.5× as long as head width, ca. 0.8× as long as pronotum width; segment II ca. 1.7–2.0× as long as head width, ca. 0.9–1.1× as long as pronotum width; segments III distinctly longer than segment II; segment IV subequal to half of segment III. Thorax: Anterior part of pronotum shorter than posterior part; collar delimited; posterior part slightly upraised; posterior margin of pronotum straight or concave; pronotum ca. 1.0– 1.2× as wide as long and ca. 1.8–2.0× as wide as head; mesoscutum usually exposed. Hemelytron: Area along inner margin of corium swollen; inner margin of cuneus convex (as in Namyatova et al., 2016: fig. 13E), outer margin of cuneus ca. 3× as long as base. Abdomen: Genital capsule rotated left at small angle relative to rest of abdomen. Genitalia: Genital capsule (fig. 14J) twice as long as wide; ventral wall ca. 1.3× as long as dorsal wall, its posterior margin smooth, without outgrowths; semioval, slightly pointed, curved dorsally from right side; left side of genital capsule not widened; margins of socket slightly acute; distance between paramere sockets subequal to half of genital capsule width at base. Right paramere (fig. 11V) distinctly curved in apical half; apex straight posteriorly; medial part slightly wider than basal part, without setae, outer margin of medial part convex; inner margin convex; outer angle rounded; inner angle distinct, without outgrowths and setae; basal part of right parameres. 0.7× as long as rest of paramere. Left paramere (fig. 11W) L-shaped; apical part not flattened, without toothlike outgrowth apically or medially and without outgrowth on dorsal surface; middle part slightly widened, without swelling or outgrowth; setae placed on middle part near outer margin. Aedeagus (fig. 10E) conjunctiva entirely membranous; secondary gonopore placed at base of vesica in repose; sclerotized part of ductus seminis twice as long as wide; vesica with two serrate spicules, bearing toothlike outgrowths.

Female. Total length 4.4–5.2. COLORATION (fig. 4): Head and labium. As in male. Antenna: Similar to male, rarely segment II pale brown basally. Thorax: Similar to male, but posterior part of pronotum uniformly yellow to pale brown or with brown humeral angles; mesoscutum and scutellum yellow to pale brown, mesoscutum medially and scutellum basally sometimes brown; thoracic pleura pale brown to brown. Hemelytron: As in male. Legs: Coxae whitish yellow, femora whitish yellow basally and yellow apically, hind femora rarely with pale brown marking at apical half, rarely uniformly whitish yellow; tibia and tarsi whitish yellow to yellow. Abdomen: Whitish yellow to yellow ventrally, segment IX pale brown or reddish, stripe laterally and dorsal surface reddish to reddish brown. SURFACE AND VESTITURE: As in male. STRUCTURE AND MEASUREMENTS: Structure as in male; body ca. 4.1–4.4× as long as pronotum width; vertex ca. 1.8–2.0× as wide as eye diameter; antennal segment I ca. 1.3–1.5× as long as head width, ca. 0.6–0.8× as long as pronotum width; segment II ca. 1.8–2.2× as long as head width, ca. 0.9–1.1× as long as pronotum width; pronotum ca. 1.1–1.3× as wide as long and ca. 2.0–2.1× as wide as head. Genitalia (fig. 16L, M): Dorsal labiate plate wider than apodemes of second valvulae, with distinct striations, without membranous ridge medially; semicircular sclerite and sclerotized rings absent; lateral oviducts placed in posterior part, far from posterior margin; spermathecal gland attached near posterior margin, posterior to lateral oviducts; dorsal labiate plate with membranous semicircular lobe anteriorly, with tubercles only on this lobe and around it.

DISTRIBUTION: China, Laos, Vietnam (fig. 18).

HOST PLANTS: Unknown.

DISCUSSION: Felisacus curvatus was described by Hu and Zheng (2001) from China (Hainan). The holotype was thought to be housed in the collection of NKMU but we could not locate it and we consider it as lost.

We provide the following translation of the type series translated from Chinese by our colleague Xiaojing Wang (personal commun., translated from Hu and Zheng, 2001):

Body slender, yellowish brown, lateral sides parallel to each other, with pale hairs; vertex yellowish brown, with reddish tinge, with rare pale semierect setae, ratio of distance between anterior margin of head to posterior margin of eye and distance between posterior margin of eye to collar equal to 0.3:0.4; frons almost flat, frons and lateral sides of head yellowish brown; base of labium brown; neck yellowish brown, with slight reddish tinge; labium yellowish brown, reaching posterior margin of forecoxae; antennae yellowish brown, apex of antennal segment I and apical half of antennal segment II slightly darkened, with rare, pale and semierect hairs, the length of hairs on antennal segment I ca. 1.5× as long as antennal segment I width; hairs on antennal segment II subequal to the antennal segment I diameter; pronotum yellowish brown, with rare pale and semierect hairs, posterior margin brown, areas near posterior margin with slightly pale red tinge; lateral margins with slight depression; scutellum yellowish brown, length of hairs ca. 2.0× as long as antennal segment I width; inner part of clavus with the main part yellowish brown, outer part of clavus brown, with rare and pale semierect hairs, equal in length to the hairs on scutellum; corium yellowish brown, semitransparent, with arcshaped, broad and dark brown marking, reaching 1/5 of claval length; cuneus yellowish brown, ¼ apex of inner margin red, length of outer margin twice as long as base; membrane pale yellowish brown, pos- terior half of wing cell and middle of membrane brownish yellow, veins yellowish brown, or with reddish tinge, apical angle round; legs yellowish brown, apex of femora and basal area of tibiae with red tinge; femora with rare, pale and semierect hairs, varying in length, short hairs subequal to middle part of femora width, longest ca. 1.5× as long as femur width; tibiae with hairs more adpressed than those on femora, hairs on half of apex dense and uniform, short hairs subequal to tibiae width, longest setae is ca. 2.0× as long as tibiae width; prosternum yellowish brown, mesosternum brown, with middle part yellowish brown, with pale semierect hairs; males with ventral side of abdomen yellowish brown, lateral side of the second segment with one long, small and red marking, segments III– VII with red lateral margins; genital segment yellowish brown; females with lateral sides of abdominal II–VII segments red.

MEASUREMENTS: Head length 0.6; head width 0.5; vertex width 0.3; antennal segments ratio 1.2:1.5:1.8:1.5; pronotum length 1.0, pronotum width 1.0; outer margin of corium 1.7; outer length of cuneus 0.7; base of cuneus width 0.3; length between apex of cuneus and end of membrane 0.6; body length 4.4–4.6.

TYPE: Male, from Hainan, 1964 03 28, Shengli LIU. This species is similar to F. ochraceus in yellowishbrown coloration, and marking around near inner margin of corium. The latter species differs in apex of antennal segment II not red; 2/3 of inner part of clavus yellowish brown, outer part of clavus brown; apical 1/6 of inner margin of cuneus pale red; the band near inner margin of corium broader and longer; pronotum with posterior margin and posterior half of lateral margin brown; parameres different; ratio of antennal segments I–III in F. curvatus : 0.8:1.0:1.2 (in F. ochraceus 0.8:1.2:0.8: ratio between length and width of cuneus in F. curvatus : 0.66: 0.27, in F. ochraceus is 0.52:0.20).

We have examined additional specimens from southeast Asia, which fit the description of F. curvatus . They possess similar parameres (Hu and Zheng, 2001: fig. 2b, c), which are very distinct in comparison to all other Felisacus species. Based on this, we treat those additional specimens as F. curvatus .

Felisacus curvatus and F. wangae are sister species and have similar female genitalia with distinct striations (cf. fig. 16L with 16N), the right-hand side of the genital capsule is slightly folded (cf. figs. 14J and 15M), and the apical sclerotized part of the ductus seminis is twice as long as wide (cf. fig. 10E with 10M). Felisacus wangae differs in that the marking on the inner margin of the corium is narrow, and its posterior part not widened (fig. 7), the labium reaches the middle of the mesosternum, and in the shape of the aedeagal spicules (fig. 10M).

MATERIAL EXAMINED: CHINA: Yunnan: Ruili, 24.01655 ° N 97.85099 ° E, 1200 m, 29 Jul 2006, Fan, 13 (00017888) ( NKMU). LAO PEO-

PLE’S DEMOCRATIC REPUBLIC: Vientiane Prov. : Ban Van Eue, 17.96666 ° N 102.6 ° E, 14 Apr 1965 – 15 Apr 1965, J.L. Gressitt, 1♀ (00043876) ( BPBM). VIETNAM: Ha Noi: 70 km NWW Ha Noi BaVi, 21.087 ° N 105.302 ° E, 22 Nov 1990, Belokobylskij, 1♀ (00017883) ( ZISP). Ha Son Binh: Hoa Binh: Near Mai Chau, 20.667 ° N 105.084 ° E, 01 Nov 1990, Belokobylskij, 43 (00017882, 00271519), 2♀ (00017886) ( ZISP) ; 02 Nov 1990, Belokobylskij, 33 (00017879– 00017881), 2♀ (0001788400017885) ( ZISP) .

Figures

FIGURE 4. Habitus of Felisacus species.

FIGURE 10. A, C–L, O, P. Apical part of aedeagus of Felisacus species B, E, M. Vesica of Felisacus species. N. Aedeagus of F.webbi.

FIGURE 11. Parameres of Felisacus species.

FIGURE 14. Genital capsule of Felisacus species.

FIGURE 16. A, C, E, G, I, K, L, N. Dorsal labiate plate of bursa copulatrix of Felisacus species B, D, F, H, J, M, O. Posterior wall of bursa copulatrix of Felisacus species The small scale is for F. curvatus and F. wangae, the large scale for all others.

FIGURE 18. Distribution of Felisacus species.