Triplatyx stysi, Kment, 2008

Kment, Petr, 2008, A revision of the endemic Madagascan genus Triplatyx (Hemiptera: Heteroptera: Pentatomidae), Acta Entomologica Musei Nationalis Pragae 48 (2), pp. 543-582 : 570-578

publication ID	https://doi.org/ 10.5281/zenodo.5341677
persistent identifier	https://treatment.plazi.org/id/A303878B-FFE3-1531-FE1D-B6898A3A8BBA
treatment provided by	Felipe
scientific name	Triplatyx stysi
status	sp. nov.

Treatment

Triplatyx stysi sp. nov.

( Figs. 7 View Figs , 14 View Figs , 18, 23 View Figs , 25 View Figs , 33-34 View Figs , 39-40 View Figs , 51 View Figs , 56 View Figs , 59, 75 View Figs , 82-83 View Figs , 85 View Figs -86)

Type locality. Madagascar, Ranomafana National Park, environs of Ranomafana village [21°15′N, 47°27′E] (Fig. 89).

Type material. HOLOTYPE: J, ‘ MADAGASCAR, 2007, / Ranomafana Nat. Park , / near Ranomafana vill., Z. Mráček leg., 28.-31.i. [p, white label] // COLLECTIO / NATIONAL MUSEUM / Praha, Czech Republic [p, white label] // J [p, white label] // HOLOTYPUS / TRIPLATYX / STYSI / sp. nov. / det. P. KMENT 2008 [p, red label]’ ( NMPC). The holotype ( Figs. 75 View Figs , 82 View Figs ) is cardmounted. Its right antennomere 5 is missing.

PARATYPES (1J 1♀): MADAGASCAR: (E), Tamatave (= Toamasina) province, Ambodinifody env., 25.xii.1996, 1 J, I. Jeniš lgt. ( ZJPC) ; Moramanga env., Rd. No. 2, km 116, 28.-29.xii.1996, 1 ♀, P. Švácha lgt. ( NMPC). Both paratypes bear the following red label : ‘ PARATYPUS / TRIPLATYX / STYSI / sp. nov. / det. P. KMENT 2008 [p]’

Description. Adult ( Figs. 75 View Figs , 82-83 View Figs ). Colouration. Ground colouration pale brown, head and thorax ventrally dark to blackish brown. Antennae blackish brown, except for antennomere 1 medially and antennomere 2 basally pale brown. Eyes brown with silver lustre. Rostrum blackish brown. Apices of claws black. Abdominal spiracles black. Laterotergites each with whitish spot medially on outer margin.

Sculpture. Body dorsally sparsely punctate; interspaces among punctures wider than their diameters, sometimes convex but not forming callosities ( Fig. 82 View Figs ); punctures dark brown to black. Anterior part of pronotum medially with short longitudinal ivory callosity ( Fig. 14 View Figs ); scutellum in posterior part with impunctate double callose line on ridge, slightly widening and divergent posteriad ( Fig. 82 View Figs ); basal angles without small globular callose grain. Head, thorax, abdomen, and femora ventrally densely covered with dark brown to black punctures. Tibiae with sparse but large brown punctures ( Fig. 83 View Figs ).

Structure. Head only slightly declivous, nearly quadrangular in outline ( Fig. 7 View Figs ). Lateral margins in front of eyes with triangular anteocular spine, more anteriorly distinctly but shallowly incised; paraclypei foliaceous, flattened, long and wide, anterior to incision regularly arcuate anteriad, meeting in front of clypeus where leaving small triangular incision; paraclypei slightly depressed medially; anterior margin of paraclypei both dorsally and ventrally without setae. Clypeus slightly convex, frons nearly flat. Antennomeres ordered from shortest to longest as 1 ≤ 3 <2 ≤ 4 <5, antennomere 2 distinctly longer than each of antennomeres 1 and 3. Bucculae regularly narrowing anteriad, evanescent, posteriorly nearly rectangular, with medially slightly insinuated lower margin.

Pronotum ( Fig. 14 View Figs ). Anterolateral angles truncated, lacking spine laterally; lateral margins concave, carinate, with one short, slender spine subapically to anterolateral margins, otherwise inerme or bearing one very small spine medially; humeral angles very wide, distinctly produced anteriad and dorsad, almost rectangular, anteriorly with 2-3 usually large, triangular to lobe-like projections, laterally truncated, nearly straight, slightly to distinctly sinuate, posterior angle triangular. Behind humeral angles, margins of pronotum nearly straight, narrowing towards scutellum; posterior margin slightly concave. Disc anteriorly and medially almost flat, obliquely descending towards head, with low and wide longitudinal elevation in anterior half; dorsal surface of humeral angles confluent with rest of pronotum; posterior part of pronotum distinctly convex sublaterally, slightly convex to nearly flat medially, forming more or less obtuse angle with anterior part of scutellum ( Fig. 75 View Figs ).

Scutellum. Basal angles shallowly depressed; disc strongly elevated, forming high triangular, apically rounded hump ( Fig. 75 View Figs ), occupying most of scutellum length except for apex; hump anteriorly convex, distinctly detached from pronotum, lateral surfaces concavely insinuated and steeply descending to margins and narrowing posteriad, posterior part of scutellum forming very distinct longitudinal ridge ( Fig. 82 View Figs ); apex of scutellum flat.

Hemelytra. Clavus with 4-5 irregular rows of punctures in widest place; apex of membrane not surpassing apex of abdomen ( Fig. 82 View Figs ).

Thorax slightly convex; sternum between coxae deeply furrowed ( Fig. 83 View Figs ). Ostiole situated on large tubercle, round, transverse ( Fig. 18, 23 View Figs ), accompanied with small auricle; auricle approximately twice longer than ostiole wide ( Fig. 23 View Figs ), metapleura around ostiole with deep round depression; evaporatorium on mesopleuron large ( Fig. 25 View Figs ), forming wide strip along posterior and lateral margins; evaporatorium on metapleuron widely surrounding tubercle bearing ostiole and projecting as wide strip mesad between meso- and metacoxae, and laterad on anterior margin along thoracic spiracle and further laterad, the ‘outlet channel’ less distinct; gyrification well developed.

Legs. Protibiae distinctly widening towards apex, outer surface distinctly flattened, lateral margin forming a sharp ridge.

Abdomen distinctly narrower than pronotum across humeral angles; sternite III distinctly depressed anteromedially ( Fig. 83 View Figs ). Laterotergites fully exposed dorsally, mediotergites completely covered with hemelytra; outer margins of laterotergites very slightly but distinctly sinuate ( Figs. 33-34 View Figs ), each laterotergite with one narrow lobe anteriorly and one posteriorly, last laterotergite only indistinctly insinuated medially; dorsal surface of laterotergites uneven, their lateral margin slightly depressed medially in outer half.

Male genitalia. Pygophore ( Figs. 39-40 View Figs ) rather small (pygophore width 1.05 mm, ratio pygophore width to body length 0.17); ventral wall basally gibbose, apically slightly depressed; ventral rim well developed, arcuate, slightly concave medially; ventral rim infolding bent dorsally, deeply V-shaped incised medially, lateral projections large, rectangular ( Fig. 39- 40 View Figs ); posterolateral angles widely rounded laterally; lateral rim infolding without projection; paramere sockets very small and shallow, hardly distinct; apices of parameres not visible from above. Paramere simple, very slender, laterally flattened, apical portion much shorter than basal portion, medially angulately curved, L-shaped, apically rounded ( Fig. 51 View Figs ). Phallotheca of aedeagus parallel-sided, sclerotized apical processes of median penal plates large, clavate ( Fig. 56 View Figs ).

Female genitalia ( Fig. 59). Gonocoxites 8 with posterior margin slightly concave and sutural margins slightly convex, nearly parallel; gonapophyses 9 visible; posterior margin of laterotergites 9 narrowly rounded. Internal female genitalia not examined.

Measurements (all in mm). See also Table 1. Holotype (J): body length 6.8; head: length 1.7, width 2.05, interocular width 1.6; length of antennomeres: 1 – 0.35, 2 – 0.5, 3 – 0.45, 4 – 0.55, 5 – 0.8; pronotum: length 1.75, width 5.9; scutellum: length 2.95, width 2.85; abdomen width 5.1 mm. Female markedly larger than both examined males: JJ 6.1-6.8 mm, ♀ 7.5 mm.

Variation. All three specimens differ slightly in the intensity of dark colouration of ventral surfaces of head and thorax, the density of black punctures on body, and the convexity of posterior margin of pronotum; there are prominent differences in the shape of humeral angles of pronotum, which can differ even between both sides of a same specimen.

Differential diagnosis. Largest species of the genus, pale coloured, easy to identify using the combination of the following characters: head almost quadrangular, distinctly insinuated in front of anteocular spine, sides of paraclypei regularly arcuate; humeral angles of pronotum very large, nearly quadrangular, distinctly turned upwards; anterolateral angles of pronotum truncated, lacking a spine laterally; posterior margin of pronotum forming an obtuse angle with anterior surface of scutellum; scutellum with very high, triangular hump, posteriorly bearing a prominent longitudinal ridge; basal angles of scutellum lacking elevated callose grain; evaporatorium very large, especially on mesopleura; protibiae distinctly widening towards apex; legs without apparent punctures; lateral margin of connexivum slightly but distinctly sinuate; and the genitalic characters.

Etymology. I dedicate this species to Prof. Pavel Štys (Charles University, Prague, Czech Republic) on the occassion of his 75 th birthday with thanks for many advice and literature.

Collecting notes. The holotype was collected on a forest margin ( Fig. 85 View Figs ). All known specimens were collected in December and January.

Distribution. Both known localities are situated in eastern Madagascar, in drainage areas of rivers flowing eastwards to the Indian Ocean, grown with humid forests.