Schaeferiana (Gaboniella subgen. n.) incompleta sp. n. from Gabon, with notes on its relationships and new records from the Central African Republic (Hemiptera, Heteroptera, Pyrrhocoridae)

Abstract A new subgenus, Gaboniella subgen. n., of the genus Schaeferiana Stehlík, 2008, and its type species, Schaeferiana (Gaboniella) incompleta sp. n. are described from Gabon. In addition the first state records of Sericocoris (Depressoculus) albomaculatus Stehlík, 2008 and Schaeferiana (Schaeferiana) mirabilis Stehlík, 2008 from the Central African Republic are provided.


Introduction
In this contribution, we describe the subgenus, Gaboniella subgen. n., of the genus Schaeferiana Stehlík, 2008, and its type species, Schaeferiana (Gaboniella) incompleta sp. n. from Gabon. This species is interesting from morphological and phylogenetic point of view, as it possesses characters placing it between the subgenus Depressoculus Stehlík, 2008 of Sericocoris Karsch, 1892 and the genus Schaeferiana Stehlík, 2008, especially in the peculiar structure of the head and pronotum. As the new species does not fit the diagnosis of the genus Schaeferiana in some points, we establish a new subgenus to accommodate it.

Materials and methods
To a large extent, the terminology for body parts in this contribution follows van Doesburg (1968), but the more specific terms proposed by Schaefer (1977) are employed for the genital capsule.  Diagnosis. Pronotal collar widened. Anterior, pale portion of pronotum elevated. Discussion. Stehlík (2008) established Schaeferiana as a new genus with particular reference to its structure of the pronotal collar and callar lobe, which is unique among all Pyrrhocoridae: 'Pronotum rather long, widening markedly towards base, posterior angles and posterior margin distinctly rounded; lateral margins strongly raised dorsally, concave (deeply in males, slightly in females); at level of callar lobe lateral margins wider than anteriorly. Pronotal collar projecting posteriad, forming rather large, horizontal plate of rectangular shape with rounded angles and irregular shallow imprints, extended above callar lobe. Base of callar lobe rudimentary, its anterior two-thirds cavernous, mostly covered by the rectangular projection of the pronotal collar, visible only as a narrow fissure. Anterolateral margin of the rudimentary part usually extended above level of the median part and strongly convex. Pronotal lobe towards base uniformly gibbous, anterolaterally deeply depressed' (Stehlík 2008). However, based on the new material available, this original diagnosis must be modified -the pale, transverse, ridge-shaped structure interpreted by Stehlík (2008) as posterior third of callar lobe, in fact, represents the anterior margin of the pronotal lobe.
However, Schaeferiana (Gaboniella) incompleta sp. n. does not fit the diagnosis of the genus Schaeferiana in some points, so we establish a new subgenus to accommodate it. This species is interesting from morphological and phylogenetic point of view, as it possesses characters placing it between the subgenus Depressoculus of Sericocoris and the genus Schaeferiana, especially in the structure of head and pronotum. Etymology. The name of the subgenus is formed from the area of origin, Gabon; gender feminine. Description. Colouration (Fig. 1). Head both dorsally and ventrally, lateral pronotal margins, pronotal epipleuron, dorsal margin of pleural flange I, ventrites (except white stripes on posterior margins of ventrites II-V), ventral and dorsal laterotergites, and pygophore red. Antennae (except of basal third of antennomere 4), callar lobe (with reddish tinge), transverse median stripe on pronotal lobe, scutellum, base of clavus (narrowing towards apex of scutellum), median round spot on corium, apex of corium, small spot on base of membrane, large round median spot on membrane, labium, pleura I-III, and legs, including coxae and trochanters, black. Basal third of antennomere 4, widened pronotal and prosternal collar, pleural flange I (except dorsal margin), entire pleural flanges I and II, epicoxal lobes I-III, and wide stripes on posterior margins of ventrites II-V white. Slightly elevated transverse stripe anteriorly on pronotal lobe, posterior margin of pronotum (widely), apical portion of clavus, and most of corium whitish-orange. Membrane pale gray.

Key to the subgenera of
Structure. Head. Body smaller, nearly parallel-sided. Head dorsally without wrinkles, median furrow not developed. Gena under the eye with distinct rounded depression anterior to bulges, extending to the median part of temple and eye. Eyes relatively small, weakly protruding. Eye and temple dorsoventrally flattened; gena under eye with distinct depression. Labium reaching base of ventrite IV.
Pronotum short. Widened pronotal collar tightly touching the slightly gibbose callar lobe. Lateral pronotal margin wide, strongly elevated dorsally, slightly concave medially. Anterior portion of pronotal lobe very slightly elevated above surrounding surface, not reaching lateral pronotal margins. Posterior pronotal margin rounded.
Scutellum. Posterior two thirds of scutellum slightly convex. Legs slender, long. Profemur not markedly thickend compared with meso-and metafemur, slightly attenuated basally and towards apex. Ventral face of profemur with five remote teeth. Tibiae distally with slender semi-erect spines. Pygophore (Fig. 2). Ventral portion of ventral wall receding in lateral view. Ventral rim medially concave, with a small tooth near each side of the incision. Lateral rim elevated above the ventral rim, sharp, somewhat lower near the dorsal rim. Ventral and lateral rim infolding steeply sloping into genital chamber; lateral rim infolding with a convex at midlength, and with a larger patch of minute black denticles near the dorsal rim.
Etymology. The species epithet is the Latin adjective incompletus, -a, -um, meaning incomplete, referring to the incompletely modified pronotal collar and callar lobe compared with Schaeferiana (S.) mirabilis.
Distribution. Known only from the type locality in Gabon.   Distribution. Democratic Republic of Congo (Stehlík 2008). New record for the Central African Republic.