Malagasycoelum Kim & Jung, 2020

Kim, Junggon, Roca-Cusachs, Marcos, Lim, Jongok & Jung, Sunghoon, 2020, Malagasycoelum dracula gen. and sp. nov., a new genus and a new species of the subfamily Mirinae (Hemiptera: Heteroptera: Miridae) from Madagascar, Zootaxa 4808 (1), pp. 165-170 : 166

Malagasycoelum Kim & Jung , gen. nov.

Diagnosis. Differs from most genera of Mirini by the following combination of characters: body elongate, almost straight, medium size, total length 5–6 mm, almost reddish-brown, glabrous; head width more than 1/2 basal pronotal width; vertex with longitudinal sulcus; vertex width less than width of one eye; antennae longer than body length; first antennal segment clavate, longer than head width; second antennal segment as long as third segment, both particularly elongate; labrum as long as 1/2 first labial segment; labium long, reaching abdomen, as long as 1/2 body length; pronotum shagreened, glabrous; scutellum tumid, glabrous; hemelytra reflective, shagreened, glabrous; tibia with brown spines; abdomen covered with golden pubescence ( Fig. 1 ); left paramere with tertiary lobe ( Fig. 2A ); secondary gonopore associated with sclerite; medial sclerite long and curved ( Figs. 2 D–E); sclerotized rings large, elongate, thin, not complete, opened anteriorly; medial process projecting into genital chamber developed ( Fig. 2F ); posterior wall simple form, interramal lobe narrowly developed ( Fig. 2G ).

Description. Body elongate, almost straight, medium in size being around 5–6 mm, somewhat glossy, shagreened. COLORATION: Reddish brown with dark markings. Head: Reddish brown; antennae mostly brown with dark markings; first segment brown with dark part; second segment brown with dark part; third segment being darker gradually toward apex. Thorax: Pronotum, scutellum and hemelytra reddish brown; membrane grayish; vein tinged with red; legs brown with dark markings; tibial spine brownish. Abdomen: Reddish brown. SURFACE AND VESTITURE: Body somewhat glossy, glabrous; head glossy, glabrous; antennal segment with sparse setae; pronotum, scutellum and hemelytra shagreened, glabrous; legs almost glabrous, except for tibia with spines and erect setae; abdomen covered with dense golden setae. STRUCTURE: Head: Hypognathous, width more than 1/2 basal pronotal width; vertex with longitudinal sulcus, width less than one eye width; antennae longer than body length; first antennal segment clavate, thicker than other segments, longer than head width; second segment cylindrical, as thick and long as third segment; labrum as long as 1/2 first labial segment; labium reaching abdomen. Thorax: Pronotum height more than dorsal medial length; calli indistinctly swollen; scutellum tumid, as high as pronotum height; lateral margin of hemelytra straight; cuneus isosceles triangle form, length as long as width; legs long and slender; third tarsal segment longer than others. Abdomen: Short, not reaching to apex of cuneus. Male genitalia: Right paramere as long as 1/2 left paramere length; left paramere scythe-shaped with tertiary lobe, hypophysis broadly developed with sharp apex, sensory lobe narrow ( Figs. 2 A–B); right paramere rod-shaped, with curved and tapering hypophysis ( Fig. 2C ); endosoma membranous with sclerites, medial sclerite long, gonoporal sclerite polygonal; secondary gonopore complete, wider opened than ductus seminis ( Figs. 2 D–E). Female genitalia: Sclerotized rings thin, opened anteriorly, medial process projecting into genital chamber ( Fig. 2F ); interramal lobe in posterior wall narrow, not surpassing to interramal sclerites ( Fig. 2G ).

Type species: Malagasycoelum dracula sp. nov.

Etymology. The genus name is a combination of the demonym Malagasy - (from Madagascar) and the suffix – coelum, present in other genera of the ACM complex. The gender is neuter.

Discussion. This new genus in Adelphocoris - Creontiades -Megacoelum complex (ACMc) is similar to genera in ACMc with possessing superficially similar dorsal morphology. However, it can be easily distinguished from most genera based on external and genital characters described above (see Chérot & Malipatil (2016) for details of other genera in ACMc). Malagasycoelum gen. nov. is similar in general appearance to the genus Orientomiris Yasunaga , but can be distinguished by the detailed external and genitalic morphology: much brighter reddish coloration, glabrous body except for abdomen, distinctly wider the compound eye than vertex width in male, thick and distinctly clavate (or gradually thickened from middle to apex) first antennal segment, tumid scutellum as high as height of pronotum, brownish tibial spine, and much simpler male genital structures (see Yasunaga (1997) for detailed male and female genital structures). This new genus is similar to Cheilocapsidea Poppius in male genitalic morphology by possessing a medial sclerite and gonoporal sclerite (as spicule and gonoporal sclerite in Chérot & Malipatil (2016); see Fig. 14 endosoma of C. insignis (Distant, 1909)) . However, it can be easily distinguished by external morphology: brownish coloration, glabrous body, clavate first antennal segment, much longer labium exceeding abdomen, tumid scutellum and uniformly colored hemelytra without markings. In ACMc, ampulated scutellum is one of the unique characters for several genera. Malagasycoelum gen. nov. is similar to the African genus Gollneria to have ampulated scutellum, but it can be distinguished by larger and brownish body, distinctly wider compound eye than vertex width, longer first antennal segment than head width, longer antennae than body length, longer labium reaching fifth abdominal segment, and scutellum without pilosity. This new genus is also similar to the Neotropic genus Carvalhocapsus with such a scutellum, but can be distinguished by reddish dorsal coloration, distinctly wider compound eye than vertex width, longer labium reaching fifth abdominal segment, and glossy and glabrous hemelytra. Genus Adelphocoridea was endemic from Madagascar in ACMc. This new genus can be distinguished from Adelphocoridea by clavate first antennal segment, almost straight (not concave) posterior margin of pronotum and distinctly tumid scutellum.

Figures

FIGURES 1. Habitus and head structures of Malagasycoelum dracula Kim & Jung, sp. nov. A: male, Holotype; B: female, Paratype; C: holotype in lateral view; D: head in frontal view. Scale bar: 1mm.

FIGURES 2. Genital structures of male and female of Malagasycoelum dracula Kim & Jung, sp. nov. A–B: left paramere; C: right paramere; D–E: endosoma; F: sclerotized rings; G: posterior wall. Scale bar: 0.1mm.