Felisacus bau, Namyatova & Cassis, 2016

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 : 55-56

Felisacus bau , sp. nov.

Figures 4 , 8D , 11H, I , 14D , 17 DIAGNOSIS: Recognized by the following combination of characters: dark coloration, head pale brown with brown marking dorsally; pronotum pale brown with dark brown marking along posterior margin; inner part of clavus brown; marking along inner margin of corium brown, narrow not extending toward R+M; scent gland evaporative area dark brown, pale brown basally; cuneus red, sometimes with brown marking along inner margin (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 small, length in male 3.2–3.7, in female 3.8; labium reaching posterior margin of mesosternum or slightly surpassing it; vesica with six spicules, including spicules A and C, spicule A shortened (fig. 8D).

DESCRIPTION: Male. Total length 3.5. COLOR- ATION (fig. 4): Head: Mostly pale brown, dorsal surface of head brown anteriorly; longitudinal sulcus brown, maxillary plate whitish yellow, slightly paler than surrounding areas. Eye dark brown, reddish at sides. Labium: Uniformly yellow. Antenna: Segment I brown, yellow basally, segment II brown. Thorax: Anterior part of pronotum pale brown with brown anterior margin; posterior part or pronotum pale brown anteriorly and brown posteriorly; mesoscutum pale brown, scutellum pale brown, brown apically; thoracic pleura brown to dark brown; scent gland evaporative area dark brown, pale brown basally. Hemelytron: Mostly translucent, colorless; inner part of clavus opaque, brown; outer part of clavus brown apically; area along inner margin of corium brown; embolium with brown margins and reddish apex; cuneus red or with brown marking along inner margin, margins reddish; anterior part of membrane with pale brown shading; membrane cell pale brown, partly reddish. Legs: Coxae whitish yellow; femora whitish yellow basally and pale brown with reddish tinge apically; tibiae pale brown with reddish tinge basally and whitish yellow apically; fore- and middle tarsi yellow to pale brown, hind tarsus whitish yellow. Abdomen: Ventral and lateral sides mostly whitish yellow, genital capsule pale brown with reddish tinge, dorsal surface brown. SURFACE AND

VESTITURE: Corium smooth, with shallow and scarce punctures. Dorsum, antennal segment I and femora with suberect setae mostly shorter than antennal segment II diameter; abdomen clothed with suberect mostly short simple setae. STRUCTURE AND MEASUREMENTS: Body 4.2× as long as pronotum width. Head: Depres- sion delimiting occipital region present dorsally and laterally; distance between depression and pronotum shorter 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× as wide as eye, upraised (fig. 6D in Namyatova et al., 2016); buccula ca. 0.2–0.25× as long as clypeus height. Labium (as in Namyatova et al., 2016: figs. 6D, 9C): Reaching posterior margin of mesosternum or slightly surpassing it; segments 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 surface elongate posteriorly; segment III slightly longer than ventral side of head; segment IV 1.5× as long as segment III. Antenna: Segment I cylindrical (as in Namyatova et al., 2016: fig. 8A), ca. 1.7× as long as head width, ca. 1.1× as long as pronotum width; segment II ca. 2.1× as long as head width, ca. 1.4× as long as pronotum width. Thorax: Anterior part of pronotum only slightly shorter than posterior part; collar delimited; posterior part slightly upraised; posterior margin concave; pronotum ca. 1.2× as wide as long and ca. 1.5× as wide as head; mesoscutum exposed. Hemelytron: Area along inner margin of corium almost flat; cuneus narrow, its inner margin convex (as in Namyatova et al., 2016: fig. 13E), outer margin almost twice as long as base. Abdomen: Genital capsule rotated left at right angle relative to the rest of abdomen. Genitalia: Genital capsule (fig. 14D) posterior margin smooth, semioval, without outgrowth, not pointed, not curved or inclined, truncate; sides of genital capsule not modified; margins of paramere sockets more or less rounded; distance between paramere sockets ca. 0.7× as long as genital capsule width at base. Right paramere (fig. 11H) apical part distinctly curved; apex slightly concave posteriorly; medial part slightly wider than basal part, bearing setae, with outer margin slightly concave and inner margin convex; outer angle distinct, not widened; inner angle rounded, without setae; basal part ca. 0.15–0.2× as long as rest of paramere. Left paramere (fig. 11G) L-shaped; api- cal 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 (general view as in Namyatova et al., 2016: fig. 22I) conjunctiva weakly sclerotized; secondary gonopore placed at base of vesica; sclerotization of ductus seminis around secondary gonopore shorter than wide; vesica with five spicules, including spicules A and C, spicule A shortened, spicule C large and moved posteriorly (fig. 8D).

Female. Total length 3.8. COLORATION, SURFACE, AND VESTITURE: As in male (fig. 4): STRUCTURE AND MEASUREMENTS: Structure as in male; body ca. 4.7× as long as pronotum width; vertex ca. 1.8× as wide as eye; antennal segment I ca. 1.8× as long as head width, ca. 1.2× as long as pronotum width; segment II ca. 2.1× as long as head width, ca. 1.4× as long as pronotum width; pronotum ca. 1.2× as wide as long and ca. 1.6× as wide as head.

DISTRIBUTION: Known from Sarawak, Borneo ( Malaysia) (fig. 17).

HOST PLANTS: Unknown.

ETYMOLOGY: The species is named after the Bau District, where it was collected.

DISCUSSION: Antennal segments III–IV are lost in the specimens we examined and the anterior part of the genital capsule is broken. Felisacus bau is similar to F. bellus , F. jacobsoni , and F. signis in appearance (figs. 4 and 6). They all differ from one another in the configuration and shape of the vesical spicules (cf. fig. 8D with figs. 8E, M, 9K); in particular F.bellus possesses an elongate spicule A, and F. jacobsoni and F. signis have only five spicules and lack spicule A. Felisacus jacobsoni can also be separated by its larger body size, 4.4–4.7 mm in males and 4.6–4.8 mm in females.

MATERIAL EXAMINED: Holotype: MALAYSIA: Sarawak: Bau District: Bidi, Bau District, 1.38389 ° N 110.13357 ° E, 165 m, 02 Sep 1958, T.C. Maa, 13 (00043878) ( BPBM). Paratype: MALAYSIA: Sarawak: Bau District: Bidi, Bau District, 1.38389 ° N 110.13357 ° E, 165 m, 02 Sep 1958, T.C. Maa, 1♀ (00043879) ( BPBM).

Figures

FIGURE 4. Habitus of Felisacus species.

FIGURE 8. Vesical spicules of Felisacus species.

FIGURE 11. Parameres of Felisacus species.

FIGURE 14. Genital capsule of Felisacus species.

FIGURE 17. Distribution of Felisacus species.