Alcecoris cochlearatus, Yasunaga & Yamada & Tsai, 2017

Yasunaga, Tomohide, Yamada, Kazutaka & Tsai, Jing-Fu, 2017, Taxonomic review of the plant bug subfamily Isometopinae for Taiwan and Japanese Southwest Islands, with descriptions of new taxa (Hemiptera: Heteroptera: Miridae: Isometopinae), Zootaxa 4365 (4), pp. 421-439 : 435-437

Alcecoris cochlearatus sp. nov.

( Figs. 3E–J , 8 )

Diagnosis. Distinguished readily from any known congener by its orange-brown basic coloration ( Fig. 3E ); two apical branches on antennal segment I and typically spoon-shaped antennal segment II ( Figs 3H , 8 ); shiny, highly polished pronotum; sharply pointed scutellum with a bundle of stiff setae ( Figs 3J , 8D ); shiny black callosity apically on corium; and white base of cuneus.

Description. Holotype female ( Fig. 3E–J , 8 ): Body generally shiny orange-brown, with fuscous corium, forewing membrane and abdomen; dorsal surface with sparsely distributed, simple, semierect setae. Head shiny orange-brown, narrowly pale along caudal margins of compound eyes, higher than wide in frontal view; compound eyes strongly protrusive dorsad, slightly separated at midline, occupying dorsal 1/4 of head. Antenna orangebrown; segment I polished, with two apical branches; segment II highly polished, conspicuous, spoon-shaped or paraboloid, caudally (or dorsally) concave; segments III and IV filiform. Labium shiny dark brown, reaching abdominal sternum IV; segment I and basal 2/3 of segment II orange-brown. Pronotum polished, impunctate, with distinctly carinate lateral margin; scutellum conically projected, with a bundle of stiff setae at apex; pleura generally shiny brown, with light brown scent efferent system. Hemelytron shiny dark brown, shallowly and roughly punctate, with lateral margin pale brown, semitransparent; clavus and anterior part of corium speckled with pale spots; apical part of corium with a shiny, fuscous callosity; cuneus with white basal half, black apical half and pale brown lateral margin; membrane including veins wholly fuscous, opaque. Coxae and legs pale creamy brown; legs long; distal 2/3 of meso- and metafemora as well as proximal 1/2 and extreme apices of meso- and metatibiae coffee brown; all tarsi smoky brown. Abdomen uniformly shiny fuscous. Genitalia not examined.

Measurements. Holotype female: Body length 2.70; head width across eyes 0.53; head height 0.75; lengths of antennal segments I–IV: 0.33, 0.90, 0.30, 0.45; maximum width of antennal segment II 0.57; mesal pronotal length 0.50; basal pronotal width 0.78; width across hemelytra 1.05; lengths of metafemur 1.05, tibia 1.65 and tarsus 0.41.

Distribution. Peninsular Malaysia (central highlands).

Biology. Unknown.

Etymology. From Latin, cochlear [= spoon, cup] + atus [suffix of possession], referring to the distinctly spoonlike antennal segment II of this new species; an adjective.

Holotype: ♀, MALAYSIA: Pahan, Cameron Highlands, SE of Ringret, Gunung [Mt.] Berembun, 4.35N, 101.45E, 26 Nov 1992, K. Matsumoto ( AMNH _PBI 00380583) ( TKPM).

Figures

FIGURE 3. Dry-preserved specimens of isometopines. A. Isometopus bipunctatus Lin, male. B. Ditto, female. C. I. takaii Yasunaga,male.D. Ditto, female. E–I.Alcecoris cochlearatus sp. nov., holotype female, from CameronHighlands, Peninsular Malaysia.

FIGURE 8. Scanning electron micrographs of Alcecoris cochlearatus sp. nov., holotype female. A. Head and anterior pronotum, dorsal view. B. Antenna. C. Anterior body, ventral view. D. Scutellum and forewing, dorsal view. E. Ditto, metathoracic scent efferent system (left). F. Mesotarsus.