Felisacus bellus Lin, 2000

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 : 57-59

Felisacus bellus Lin

Figures 4 , 8E , 11J, K , 17

Felisacus bellus Lin, 2000: 233 (original description).

DIAGNOSIS: Recognized by the following combination of characters: mostly dark coloration, head and pronotum yellow to pale brown, often with dark brown marking along posterior margin; inner part of clavus brown, sometimes with red outer margin; marking along inner margin of corium brown to reddish brown, not extending toward R+M anteriorly; cuneus red with brown margins, often with yellow outer angle (fig. 4); antennal segment I cylindrical (as in Namyatova et al., 2016: fig. 8A), depression delimiting occipital region present dorsally and laterally; vertex upraised (as in Namyatova et al., 2016: fig. 6D); body length in male ca. 3.7–4.5, in female 4.0–4.4; labium reaching posterior margin of mesosternum; apical part of right paramere distinctly delimited, outer margin of right paramere straight (fig. 11J); vesica with six spicules, including spicules A, B and G, with spicule A long and narrow (fig. 8E).

REDESCRIPTION: Male. Total length 3.7–4.5. COLORATION (fig. 4): Head: Mostly yellow to pale brown, with brown markings and reddish tinge; labrum dark brown; labrum dark brown. Eye dark brown to black. Labium: Segments I–II whitish yellow to yellow, segments III–IV yellow to pale brown, segment III sometimes with reddish tinge. Antenna: Segment I pale brown to brown, segments II–IV brown to dark brown. Thorax: Pronotum yellow with anterior margin and 1/3 of posterior part brown, anterior part sometimes with reddish tinge; mesoscutum pale brown, scutellum pale brown, brown medially and posteriorly; thoracic pleura yellow, metapleuron sometimes with brown marking; scent gland evaporative area whitish yellow basally and brown apically. Hemelytron: Mostly translucent, colorless; inner part of clavus opaque, brown, sometimes with red outer margin; area along inner margin or corium brown to reddish brown, not extending toward R+M anteriorly and continuing to the posterior margin of embolium; embolium reddish apically, margins brown; cuneus red with brown margins, often with yellow outer angle; membrane with pale brown or grayish tinge; membrane cell pale brown or red. Legs: Coxae whitish yellow; femora whitish yellow basally and yellow to brown apically; tibiae mostly yellow to pale brown, often coloration gradually changing from brown or pale brown basally to yellow or whitish yellow apically; tarsi pale brown, tarsal segment I sometimes yellow. Abdomen: Ventral side whitish yellow, genital capsule pale brown with reddish posterior margin, lateral and dorsal surfaces brown. SURFACE AND VESTITURE: Corium with shallow and scarce punctures. Dorsum with suberect setae mostly as long as or slightly longer than antennal segment II diameter; antennal segment I and femora with suberect setae mostly as long as or slightly shorter than antennal segment II diameter; those on antennal segment I scarce; abdomen clothed with suberect mostly short simple setae. STRUCTURE AND MEASUREMENTS: Body ca. 4.3–4.4× as long as pronotum width. Head: Depression delimiting occipital region present dorsally and laterally (as in Namyatova et al., 2016: fig. 4E); distance from depression to pronotum distinctly as long as or longer than eye diameter; longitudinal sulcus on dorsal surface longer than eye diameter; distance from eye to pronotum slightly longer than eye diameter, not swollen laterally (as in Namyatova et al., 2016: fig. 4E); vertex ca. 1.7–1.9× as wide as eye; upraised (Namyatova et al., 2016: fig. 6D); buccula ca. 0.2–0.25× as long as clypeus. Labium (as in Namyatova et al., 2016: figs. 6D, 9C): Reaching posterior margin of mesosternum; segment I and II strongly reduced, combined shorter than half of segment III; segment I shorter than wide; segment II slightly longer than wide, its dorsal side elongate posteriorly; segment III slightly longer than ventral side of head length; segment IV twice as long as segment III. Antenna: Segment I cylindrical (as in Namyatova et al., 2016: fig. 8A), ca. 1.5–1.7× as long as head width, ca. 0.9–1.0× as long as pronotum width; segment II ca. 2.1× as long as head width, ca. 1.3× as long as pronotum width; segments III slightly longer than segment II, ca. 0.3× as long as antennal segment IV. Thorax: Anterior part of pronotum slightly shorter than posterior part; posterior part of pronotum slightly upraised, collar delimited; posterior margin concave, pronotum ca. 1.2–1.3× as wide as long and ca. 1.7× as wide as head; mesoscutum exposed. Hemelytron: Area along inner margin of corium almost flat; inner margin of cuneus convex, outer margin of corium ca. 2.5– 3× as long as base. Abdomen: Genital capsule rotated left at right angle relative to the rest of abdomen. Right paramere (fig. 11J) apical part distinct; apex slightly concave posteriorly; medial part less than twice as wide as basal part, bearing setae, with outer margin straight and inner margin swollen; outer angle distinct; inner angle rounded, without setae; basal part ca. 0.15–0.2× as long as rest of paramere. Left paramere (fig. 11K) L-shaped; apical part not flattened, with toothlike outgrowth on posterior side medially (as in fig. 11G) and without outgrowth on dorsal surface; middle part widened, without swelling or outgrowth; setae only on middle part near outer margin. Aedeagus (as in fig. 8E) conjunctiva weakly sclerotized; secondary gonopore placed at base of vesica; sclerotization of ductus seminis around secondary gonopore shorter than wide; vesica bearing six spicules, including spicules A, B and G, with spicules A long and narrow (fig. 8E).

Female. Total length 4.0–4.4. COLORATION (fig. 4): Head: Yellow, often anterior and ventral surfaces, buccula, mandibular, maxillary plates and clypeus whitish yellow to yellow; frons, dorsal and lateral sides and clypeus basally sometimes with reddish tinge. Eye dark brown to black. Labium: Similar to male, sometimes uniformly yellow. Antennae. As in male. Thorax: Pronotum yellow with pale brown anterior margin, often with reddish tinge laterally, posterior margin with markings medially and near humeral angles brown to dark brown, some- times entire posterior margin brown to dark brown or medial marking indistinct; mesoscutum yellow to pale brown; scutellum yellow to pale brown, brownish apically, sometimes medial part also brown, rarely with narrow, brown longitudinal stripe from center to apex; thoracic pleura yellow, sometimes with brown markings; scent gland evaporative area whitish yellow basally, yellow to brown apically, sometimes mostly brown. Hemelytron: Similar to male, but inner part of clavus sometimes yellow or pale brown with brown margins; area along inner margin of corium sometimes short; not reaching R+M; cuneus rarely mostly whitish yellow with reddish tinge with pale brown margins and red apical third. Legs: Similar to male, femora sometimes uniformly yellow, middle tibia rarely pale brown, tibiae sometimes with pale brown apex. Abdomen: Ventral and lateral sides whitish yellow, lateral side often with pale brown to brown markings, segment IX pale brown, or whitish yellow with reddish apex, dorsal surface whitish yellow to brown; rarely abdomen uniformly whitish yellow with reddish apex. SUR- FACE AND VESTITURE: As in male. STRUCTURE AND MEASUREMENTS: Structure as in male; body ca. 3.9–4.4× as long as pronotum width; vertex ca. 1.9–2.2× as wide as eye; antennal segment I ca. 1.3–1.7× as long as head width, ca. 0.8–1.0× as long as pronotum width; segment ca. II 1.8–2.1× as long as head width, ca. 1.1–1.2× as long as pronotum width; pronotum ca. 1.2–1.3× as wide as long and ca. 1.7× as wide as head. Genitalia (as in Namyatova et al., 2016: fig. 23F, G): Dorsal labiate plate wider than distance between apodemes of second valvula; mostly smooth, without distinct striations or longitudinal membranous ridge, with semicircular sclerites and distinct sclerotized rings laterally; lateral oviducts placed almost medially, very close to each other, spermathecal gland placed between lateral oviducts; dorsal labiate plate with distinct tubercles, without membranous lobe medially.

DISTRIBUTION: China, Taiwan, Vietnam (fig. 17).

HOST PLANTS: Unknown.

DISCUSSION: We examined one female paratype and a digital image of the holotype that is deposited in the Taiwan Agriculture Research Institute. We were therefore unable to examine the male genitalia. However, the additional specimens we were able to examine are very similar to the types and also were collected in southeast Asia ( Vietnam and China), and we concluded that they are conspecific with F. bellus .

Felisacus bellus is almost indistinguishable from F. jacobsoni in coloration (fig. 4), having similar size and body structure, but the latter species differs in the labium reaching the posterior part of the metasternum and differs in the morphology of the vesical spicules (cf. figs. 8E with 8M); in particular, F. jacobsoni possesses only five spicules with spicule 1 broad.

Felisacus bellus is also similar to F. bau in external morphology, coloration (fig. 4) and in the number of spicules (cf. figs. 8D with 8E), but the latter species is lacking spicules B and G and possesses spicule C. Felisacus bau also has the right paramere with the apical part not delimited (fig. 11H).

MATERIAL EXAMINED: Paratype: TAIWAN: Nantou: Tungpu, Nantou Hsien, 23.91448 ° N 120.6812 ° E, 1200 m, 20 Jun 1983 – 24 Jun 1983, K.C. Chou and C.Y. Wong, 1♀ (00005119) ( NMNS). Additional material: CHINA: Yunnan: Longyang, 35.16666 ° N 117.25 ° E, 1600 m, 12 Aug 2006, unknown, 1♀ (00017868) ( NKMU). Menghai, 21.97145 ° N 100.44914 ° E, 05 Oct 1979, Le-Yi Zheng, 1♀ 00018515) ( NKMU). THAILAND: Nakhon Ratchasima: Wang Nam Khieo: Sakaerat Environmental Research Station, 14.5075 ° N 101.9275 ° E, 410 m, 19 Aug 2008 – 21 Aug 2008, Yasunaga and Shishido, 1♀ (00021582) ( TYCN). VIETNAM: Hòa Bình: Hoa Binh: Near Mai Chau [Mai Chon, Mai Chou], 20.667 ° N 105.084 ° E, 04 Nov 1990, Belokobylskij, 23 (00018447), 1♀ (00018514) ( ZISP). Lam Dong: 6 km S Dalat, 11.91724 ° N 108.44464 ° E, 1450 m, 09 Jun 1961 – 07 Jul 1961, N.R. Spencer, 2♀ (00017873, 00271514) ( BPBM).

Figures

FIGURE 4. Habitus of Felisacus species.

FIGURE 8. Vesical spicules of Felisacus species.

FIGURE 11. Parameres of Felisacus species.

FIGURE 17. Distribution of Felisacus species.