Stysiana Grazia, Fernandes & Schwertner 1999
Creators: name: Barros, Lurdiana D.
name: Barão, Kim R.
name: Grazia, Jocelia
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Pentatomidae
Stysiana

description: Stysiana Grazia, Fernandes & Schwertner, 1999
Stysiana Grazia, Fernandes & Schwertner, 1999: 71–83; Frey-da-Silva et al. 2002: 181; Ruschel et al. 2013: 556, 559; Barão et al. 2017: 110; Coscarón, 2017: 232; Silva et al. 2018: 433.
Type species. Stysiana pardidens Grazia, Fernandes & Schwertner, 1999.
Diagnosis. Bucculae lobate posteriorly. Posterior margins of pronotum rectilinear. Mesosternum elevate and slightly grooved. Spiracles elliptical. Trichobothria laterally to an imaginary line tangent to the spiracles. Posterior annular flanges thinner in relation to capsula seminalis.
Redescription. Body elliptical (Figs 143–146). General coloration light-brown to orangish-brown. Dorsal surface of body slightly convex, ventral surface of body slightly convex. Dorsal surface of body with dense and dark punctures, ventrally, more concentrated and smaller in sternites. Mandibular plates longer than clypeus; lateral margins of mandibular plates sinuous, elevated in relation to the plan of mesial margins; mesial margins of mandibular plates contiguous in relation to the clypeus, and apically convergent or not. Clypeus wide basally. Proportions of antennomeres: 1> 2 <3> 4 <5; antennomere 2 smaller than 1; antennomere 3 cylindrical and dorsally convex; antennomere 4 conical, slightly flattened dorsally. Bucculae lobate, not reaching the base of head (Figs 12, 149). Median labium, reaching between the metacoxae (Figs 19, 148–149, 161, 167, 172). Proportions of labiomeres: 1 <2> 3> 4; labiomere 2 cylindrical. Processes of anterior angles of pronotum obtuse. Anterolateral margins of pronotum convex, with outline concolour to pronotum, evenly punctated and crenulated. Posterolateral margins of pronotum sinuous. Posterior margin of pronotum rectilinear (Figs 4, 168, 173). Mesosternum carinate or slightly elevated and metasternum elevated and grooved. Each ostiole of ESES elliptical, each peritreme reaching about 1/3 of the distance to lateral margin of evaporatorium; median furrow of the peritreme variable in species; evaporatorium punctate, reaching more than half of width meso- and metapleuron, and present in a diagonal from mesepimeron to mesepisternum. Each outer margin of metapleural evaporatorium concave. Evaporatorium on mesopleuron reaching its anterior and posterior lateral angles, and the outer margin. Wrinkles of gyrification of evaporatorium variable in species. Metathoracic spiracle wide (Figs 23, 26). Callosity at apex of radial vein pale yellow. Membranal suture sub-rectilinear. Hemelytra not surpassing the apex of abdomen. Connexivum exposed, angles not concolour to dorsal color (Figs 143–146, 147, 160, 166, 171). Posterolateral angles of sternites not produced. Spiracles elliptical, spiracle of abdominal sternite 2 not covered by metathorax. Mesial area adjacent to spiracles with or without callosity. Trichobothria laterally to an imaginary line tangent to the spiracles.
Male genitalia. Pygophore subrectangular, longer than wide; posterolateral angles quadrate. Middle region of dorsal rim variable. Extension of dorsal rim obsolete. Area between layers of ventral rim excavated, not separated by a carina. Inferior layer of ventral rim with a pair of processes. Segment X “pear-shaped”, carinate (Figs 36–38, 151–153, 175–177). Phallus (Figs 45–47, 154–157, 178–181): Dorsal connectives of articulatory apparatus longer, surpassing the distal half of phallotheca. Processus capitati longer, reaching phallotheca distal margin. Phallotheca shorter than wide apically; dorsal processes of phallotheca of variable width in species, longer than posterodorsal projection, and curved. Conjunctiva with processes strongly sclerotized, and three pairs of lobes: lateral, median and ventral lobes, membranous. Ductus seminis distalis long, in relation to conjunctiva, convolute.
Female genitalia. Valvifers 8 convex, subequal in length to laterotergites 9, posterior margins sinuous. Valvifers 9 swollen, with posterior margins convex; sclerotized lateral arms attaining the anterior margins of laterotergites 9, and lateral margins with process, partially covering the laterotergites 9, forming a constriction. Mesial margins of laterotergites 9 divergent; posterior margins obtusely projected and surpassing abdominal tergite 8 (Figs 51, 158, 164, 182). Ectodermal ductus (Figs 54, 159, 165, 170, 183): Proximal ductus receptaculi convoluted, extremely long in relation to vesicular area, diameter variable. Distal ductus receptaculi extremely long, at least three times longer than vesicular area. Anterior annular flange smaller than pars intermedialis and posterior annular flange thinner in relation to capsula seminalis. Capsula seminalis globose, with or without process.
Distribution. Costa Rica (Taboga); French Guyana; Brazil (Amazonas, Pará, and Paraná); Peru (Loreto); Bolivia (Beni) (Fig. 184).
Key to species of Stysiana (adapted from Grazia et al. 1999)
1 Mesosternum conspicuously carinate. Dorsal processes of phallotheca medially narrow. Conjunctiva with two pairs of processes.............................................................................................. 2
- Mesosternum slightly elevate. Dorsal processes of phallotheca wider basally. Conjunctiva with one pair of processes (Figs 154–157)................................................................................. S. acarinatis
2 Apices of mandibular plates divergent before clypeus. Posterior margins of laterotergites 8 obtusely projected (Fig. 164)........................................................................................... S. meridionalis
- Apices of mandibular plates convergent before clypeus. Posterior margins of laterotergites 8 straight................... 3
3 Outline of anterolateral margins of pronotum punctate (Figs 166, 168). Mesial area adjacent to spiracles without callosity. Genital cup occupying more than half of pygophore length. Middle region of dorsal rim of pygophore notched (Figs 36–38). Dorsal connectives of articulatory apparatus longer, surpassing the distal half of phallotheca. Anterior margins of valvifers 9 straight.......................................................................................... S. pardidens
- Outline of anterolateral margins of pronotum not punctate (Figs 167, 169). Mesial area adjacent to spiracles with callosity. Genital cup occupying less than half of pygophore length. Middle region of dorsal rim of pygophore entire (Figs 175–177). Dorsal connectives of articulatory apparatus shorter, not reaching the distal half of phallotheca. Anterior margins of valvifers 9 concave................................................................................... S. tropicalis
description: Published as part of Barros, Lurdiana D., Barão, Kim R. & Grazia, Jocelia, 2021, Taxonomic updates on the Mecocephala group (Hemiptera: Pentatomidae) Redescription of ' Hypatropis complex', with a review of genitalic terminology and new records, pp. 1-46 in Zootaxa 4981 (1) on pages 27-28, DOI: 10.11646/zootaxa.4981.1.1, http://zenodo.org/record/4897374