Felisacus tanna, 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 : 148-150

Felisacus tanna , sp. nov.

Figures 7 , 9M , 13T, U , 15K, 20

DIAGNOSIS: Recognized by the following combination of characters: head yellow to pale brown dorsally; pronotum, including collar and humeral angles, mostly whitish yellow to yellow; inner margin of clavus yellow; scent gland evaporative area whitish basally and yellow or red apically, rarely uniformly red; cuneus colorless, often with yellow tinge, with margins yellow to pale brown; cylindrical antennal segment I (as in Namyatova et al., 2016: fig. 8A), vertex upraised (as in Namyatova et al., 2016: fig. 6D); labium reaching posterior margin of metasternum or slightly surpassing it; setae on femora distinctly shorter than antennal segment II width; medial part of right paramere distinctly wider than basal part; shorter than basal and apical parts combined; its outer margin straight (fig. 13T); apical part of left paramere not widened, ca. 3× as long as wide (fig. 13U); vesica with six spicules, including spicules A, B, and E (fig. 9M).

DESCRIPTION: Male. Total length 3.4–3.6. COLORATION (fig. 7): Head: Mostly whitish yellow to yellow, dorsal surface sometimes with reddish tinge and reddish markings. Eye dark brown, often with reddish tinge. Labium: Whitish yellow to yellow, labial segment III with reddish stripe ventrally, segment IV often somewhat darker than segments I–III. Antenna: Segment I yellow to pale brown often with reddish tinge; segment II yellow to brown, sometimes with reddish tinge, often darker than segment I; segments III–IV brown to dark brown often darker than segment II. Thorax: Pronotum whitish yellow to yellow, often with reddish tinge anteriorly or with reddish stripe laterally, collar with brown anterior margin; mesoscutum and scutellum whitish yellow to yellow; thoracic pleura yellow, sometimes with reddish tinge; scent gland evaporative area whitish basally and yellow or red apically, rarely uniformly red. Hemelytron: Mostly translucent and colorless; inner part of clavus opaque or translucent, yellow, with margins yellow to pale brown; marking along inner margin of corium yellow; embolium with pale brown margins and yellow apex; cuneus often with yellow tinge, with margins yellow to pale brown; membrane with yellow tinge, membrane cell yellow. Legs: Coxa whitish yellow; femora whitish yellow basally and yellow to pale brown apically; tibia yellow to pale brown, femora and tibia sometimes with reddish tinge; tarsi often pale brown with segment I paler, yellow to pale brown, sometimes uniformly yellow to pale brown. Abdomen: Ventral and lateral sides whitish yellow to yellow, dorsal surface reddish, genital capsule sometimes darker than pregenital segments, yellow to pale brown, rarely abdomen uniformly red. SURFACE AND VESTITURE: Corium smooth, with shallow and scarce punctures. Dorsum clothed with setae subequal to or shorter than antennal segment II diameter; antennal segment II, femora and abdomen clothed with suberect setae distinctly shorter than antennal segment II diameter. STRUC- TURE AND MEASUREMENTS: Body ca. 4.4– 4.6× as long as pronotum width. Head: Depression delimiting occipital region present dorsally and laterally (as in Namyatova et al., 2016: fig. 4E); distance between depression and pronotum distinctly shorter than eye diameter; longitudinal sulcus on dorsal surface of head slightly longer than eye diameter; distance from eye to pronotum longer than eye diameter, not swollen laterally (as in Namyatova et al., 2016: fig. 4E); vertex ca. 1.6–2.0× as wide as eye, upraised (as in Namyatova et al., 2016: fig. 6D). Labium (as in Namyatova et al., 2016: figs. 6D, 9C): Reaching posterior margin of metasternum 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 longer 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. 1.5– 1.8× as long as head width, ca. 0.9–1.1× as long as pronotum width; segment II ca. 2.0–2.2× as long as head width, ca. 1.2–1.4× as long as pronotum width; antennal segment III slightly longer than segment II; segment IV ca. 0.3× as long as segment III. Thorax: Anterior part of pronotum slightly shorter than posterior part; collar delimited; posterior part of pronotum slightly upraised; posterior angles of pronotum not delimited with depression; posterior margin of pronotum straight or concave, pronotum ca. 1.3× as wide as long and ca. 1.5–1.7× as wide as head; mesoscutum not exposed or exposed. Hemelytron: Area along inner margin of corium flat; 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 right angle relative to the rest of abdomen. Genitalia: Genital capsule (fig. 15K) ca. 1.5× as long as wide; ventral wall ca. 1.5× as long as dorsal wall, with posterior margin of ventral wall semioval, smooth, without outgrowth, apex inclined leftward, not curved; sides of genital capsule not modified; paramere socket slightly acute, left paramere socket rounded; distance between paramere sockets subequal to half of genital capsule width at base. Right paramere (fig. 13T) distinctly curved in apical half; apex straight posteriorly; medial part twice as wide as basal part, bearing setae, with outer margin straight and inner margin widened; outer angle distinct, not widened; inner angle rounded, without setae; basal part of paramere ca. 0.15–0.2× as long as rest of paramere. Left paramere (fig. 13U) L-shaped; apical part not flattened, with tooth- like 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 vesical in repose; sclerotization of ductus seminis around secondary gonopore shorter than wide; vesica with six spicules, including spicules A, B, and E, spicule A short and spicule B large and serrate apically (fig. 9M).

Female. Total length 3.5–3.8. COLORATION (fig. 7): Head and labium: As in male. Antenna: Similar to male, antennal segment II rarely yellow with reddish tinge. Thorax: Similar to male, but posterior part of pronotum rarely pale brown posteriorly. Abdomen: Whitish yellow to yellow with red dorsal surface. SURFACE AND VESTI-

TURE: As in male. STRUCTURE AND MEA-

SUREMENTS: Structure as in male; body ca. 4.2–4.7× as long as pronotum width; vertex ca. 1.8–2.2× as wide as eye; antennal segment I ca. 1.6–1.7× as long as head width, ca. 1.0–1.1× as long as pronotum width; segment II ca. 1.9–2.1× as long as head width, ca. 1.1–1.3× as long as pronotum width; pronotum ca. 1.2–1.4× as wide as long and ca. 1.5–1.7× as wide as head. Genitalia (as in Namyatova et al., 2016: fig. 22I): Dorsal labiate plate wider than distance between apodemes of second valvula; mostly smooth, without distinct striations, with semicircular sclerite 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: Vanuatu (Tanna Is., Maewo Is.) (fig. 20).

HOST PLANTS: Unknown.

ETYMOLOGY: The species is named after Tanna Is., where most of the examined specimens were collected.

DISCUSSION: Felisacus tanna is similar to F. glabratus in coloration (figs. 5, 7) and the broad medial part of the right paramere (cf. fig. 11AF with fig. 13T), but the latter species differs by the labium reaching the middle of the mesosternum, the medial part of the right paramere has the outer margin concave (fig. 11AF) and the vesica has five spicules, including spicules B and F (fig. 8J).

Felisacus tanna can also be confused with F. filicicola , F. lordhowensis , and F. schuhi (figs. 5, 6), but these latter three species differ in the middle part of the right paramere being only slightly wider than the basal part (figs. 11AD, 12S, 13L) and the shape and/or number of the vesical spicules (figs. 8I, R, 9J).

MATERIAL EXAMINED: Holotype: VANUATU: Taffeta: Tanna Is.: 2 km S Ipeukeul, 19.51511 ° S 169.45466 ° E, 350 m, 23 Aug 1979, G.A. Samuelson, 13 (00043068) ( BPBM). Paratypes: VANU- ATU: Penama: Maewo Is.: Sounwari, 15.38 ° S 168.12989 ° E, 50 m, 04 Sep 1979 – 05 Sep 1979, B.H. Gagne, 33 (00043052–00043054), 2♀ (00043061, 00043063) ( BPBM). Taffeta: Tanna Is.: 2 km S Ipeukeul, 19.51511 ° S 169.45466 ° E, 350 m, 23 Aug 1979, G.A. Samuelson, 113 (00043069–00043072, 00043077–00043083), 3 juvenile (00043073–00043075), 1 sex unknown (00043066), 1♀ (00043076) ( BPBM). Loounapkaukangeus, 19.5 ° S 169.3 ° E, 350 m, 03 Mar 1970, N.L.H. Krauss, 13 (00043067) ( BPBM).

Figures

FIGURE 7. Habitus of Felisacus species.

FIGURE 9. Vesical spicules of Felisacus species.

FIGURE 13. Parameres of Felisacus species.

FIGURE 20. Distribution of Felisacus species.