Prisopoides atrobrunneus, Heleodoro & Rafael, 2020

Heleodoro, Raphael Aquino & Rafael, Jose Albertino, 2020, Review of the genus Dinelytron Gray (Prisopodidae: Prisopodinae: Prisopodini), with a phylogenetic analysis of the genera of the Prisopodini, including the description of a new genus, Zoologischer Anzeiger 285, pp. 37-80 : 60

Prisopoides atrobrunneus sp. nov.

Fig. 28A-B.

Examined material. Holotype _: “ Brasil, Rio de Janeiro, Corcovado, xii.1959, Alvarenga e Seabra ” ( UFPR).

Etymology. The species name is derived from the Latin adjectives ater (dark, black) and brunneus (brown), referring to the dark brown coloration of the head and thoracic terga of the species.

2 Diagnosis. Head and thoracic terga dark brown ( Fig. 28A-B). Mid femur and posterior femur anteriorly shiny, brown with several scattered foggy-like black spots; ventral margin inconspicuously sinuous ( Fig. 28D). Abdominal sterna laterally dark brown, medially black ( Fig. 28C). Sternum 7 trapezoidal, 1.4 times wider than long ( Fig. 29A). Subgenital plate with posterior margin nearly straight, medial projection conspicuously emarginated ( Fig. 29A). Vomer slender slightly arched at base ( Fig. 29B). Basal pouch in dorsal view with width gradually decreasing from anterior half towards posterior half; posterior margin arched ( Fig. 30). Dorsal left sclerite in dorsal view slightly sinuous, with widened base gradually narrowing towards apex ( Fig. 30).

Description. Head. Dark brown with small tubercles at vertex ( Fig. 28A, B). Gena dark brown, rugose. Clypeus and area between clypeus and labrum light brown. Area between clypeus and labrum ellipsoid, conspicuous. Labrum black. Compound eyes coppercolored, with black spots ( Fig. 28A,B). Antenna light brown with dark brown spots, with long setae ( Fig. 28A, B). Flagellomere 1 2.5 times longer than pedicel and flagellomeres 2-3. Maxillary and labial palpi dark brown, with small setae.

Thorax. Thoracic terga dark brown ( Fig. 28A). Pronotum with brown spots, inconspicuous medial longitudinal carina ( Fig. 28A). Mesonotum same as pronotum, but 1.3 times longer than pronotum, with conspicuous longitudinal medial carina; scutellum triangular ( Fig. 28A). Metanotum smooth, shiny. Coxopleurite circular, rugose. Mesothoracic epimeron irregular in shape, rugose. Mesothoracic episternum rugose, with short setae at ventral margin. Metathoracic pleural region dark brown, opaque, rugose, with several scattered brown spots. Thoracic sterna shiny, black, with brown spots. Probasisternum light brown, smooth, with medial black spot. Mesobasisternum rugose. Metasternum rugose, with light brown spots posteriorly.

Legs. Anterior leg covered posteriorly with long setae. Anterior femur dorsally opaque, dark brown, with few scattered tubercles; ventrally light brown, with small setae. Anterior tibia same as anterior femur. Mid femur anteriorly shiny, posteriorly brown with several scattered foggy-like black spots, same as anterior femur; ventral margin inconspicuously sinuous, with long setae ( Fig. 28D). Mid tibia same as mid femur anteriorly but opaque and without black spots; posteriorly same as mid femur. Posterior leg with long setae at ventral margin. Posterior femur anteriorly shiny, brown with several scattered foggy-like black spots; posteriorly opaque, brown; dorsally with long setae; ventral margin inconspicuously sinuous, with long setae ( Fig. 28B, D). Posterior tibia same as posterior femur, but anteriorly opaque; ventral margin inconspicuously sinuous, with 16 small spines.

Wings. Tegmina hyaline, with brown veins and transverse veins, blunt apex ( Fig. 28A). Posterior wing with apical third of costal area dark brown; median and basal thirds hyaline ( Fig. 28A). Anal area entirely hyaline.

Abdomen. Abdominal terga shiny, brown, with black spots. Terga 3-7 rectangular, longer than wide. Abdominal sterna laterally dark brown, medially black ( Fig. 28C). Cercus with long setae. Sterna 3-6 rectangular, longer than wide. Sternum 7 trapezoidal, 1.4 times wider than long ( Fig. 29A). Sternum 8 rectangular, slender, two times wider than long ( Fig. 29A). Subgenital plate with anterior margin straight, lateral margin arched, convex, posterior margin nearly straight, medial projection conspicuously emarginated ( Fig. 29A). Vomer with base almost straight, widened, lateral margin sinuous, thin, apex oblong ( Fig. 29B).

Genitalia ( Figs. 30- 32). Basal pouch in dorsal view with gradually narrowing from anterior half towards posterior half; posterior margin arched. Dorsal left sclerite well pigmented, elongated, approximately 2.2 times longer than wide; in dorsal view slightly sinuous, with widened base gradually narrowing towards apex lateral margins sinuous, with rounded apex; dorsally connected with basal pouch, then gradually curving mesaly towards ventral wall of genitalia. Ventral lobe with single finger-like projection.

Measurements. Body length 47.3; pronotum 3.1; mesonotum 4.1; anterior femur 7.2; mid femur 7.7; posterior femur 11.3.

Holotype condition. In good condition, except for the left anterior leg, which is separated from the body and glued to a label sheet.

Geographical records. Brazil, Rio de Janeiro : Rio de Janeiro.

Remarks. This is the longest species of the genus. It can be differentiated from Pe. brunnescens sp. nov. by the coloration of the anterior portion of the mid and posterior femurs (shiny, brown with scattered foggy-like black spots) as well as the coloration of the abdominal sterna (laterally brown, medially black). In P. brunnescens sp. nov., the coloration of the anterior portion of the mid and posterior femurs is light brown, with light brown spots, whilst the abdominal sterna are laterally light brown and medially dark brown. The species can also be differentiated from Pe. villosipes comb. nov. by the conspicuous dark brown coloration of the head and thoracic terga, and from Pe. caatingaensis sp. nov. by the lack of scattered small black spots on the ventral side of the anterior femur.