Dinelytron ramusculus, 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 : 52-55

publication ID	https://doi.org/ 10.1016/j.jcz.2020.01.005
DOI	https://doi.org/10.5281/zenodo.3716934
persistent identifier	https://treatment.plazi.org/id/9D0A8794-FFD8-0675-0668-600EB861EFBE
treatment provided by	Plazi
scientific name	Dinelytron ramusculus
status	sp. nov.

Treatment

Dinelytron ramusculus View in CoL sp. nov.

Fig. 20A-C View Fig .

Examined material. Holotype _: “CEIOC, 7643” “Itatiaia, Est do Rio , BRASIL, J. F. Zikan, ii.1948 ” “ Dinelytron sp, Conle, O. det., xii.2013 ” ( CEIOC).

Paratype _: “ITATIAYA [ Itatiaia ], 700m, Est do Rio [Rio de Janeiro], Brasil, xii.1952, W. Zikan. Ex. Col. Gargarin [from Gargarin collection’ s]” ( MNRJ lost in the burning) .

Etymology. From the Latin ramusculus (stick), referring to the morphological resemblance of this species to twigs.

Diagnosis. Area between clypeus and labrum ovoid, small, conspicuous ( Fig. 20C View Fig ). Subgenital plate with basal margin conspicuously convex, apical margin medially with light emargination ( Fig. 21A View Fig ). Vomer with widened base and almost straight lateral margin ( Fig. 21B View Fig ). In dorsal view ( Fig. 22 View Fig ): basal pouch bacilliform; dorsal left sclerite weakly pingmented, having apex conspicuously widened, with all margins convex; internal sclerite two times shorter than basal pouch, resembling an inverted comma.

Description. Head. Dark brown, almost black ( Fig. 20A, B View Fig ). Frontal suture inconspicuous, forming a triangular conspicuous dark brown sulcus ( Fig. 20C View Fig ); coronal suture inconspicuous. Clypeus four times wider than high, dark brown with light brown spots; basal margin medially emarginated, lateral margin convex, apical margin slightly sinuous ( Fig. 20C, D View Fig ). Area between clypeus and labrum ovoid, small, conspicuous ( Fig. 20C, D View Fig ). Labrum symmetrical, dark brown with conspicuous light-yellow spot medially ( Fig. 20C, D View Fig ). Antenna with flagellum dark brown ( Fig. 20A View Fig ); flagellomere 1 rectangular, longer than wide, 2.2 times longer than flagellomere 2; flagellomere 2 subtriangular; flagellomere 3 rectangular, longer than wide, 1.2 times longer than flagellomere 2. Compound eye globose, light brown with dark brown spots ( Fig. 20C View Fig ).

Thorax. Dorsally dark brown, with light brown spots ( Fig. 20A View Fig ). Pronotum with inconspicuous longitudinal medial sulcus, 1.6 times longer than wide ( Fig. 20A View Fig ). Mesonotum 1.6 times longer than pronotum, with conspicuous longitudinal medial carina ( Fig. 20A View Fig ). Metanotum dark brown. Coxopleurite dome-like in shape, dark brown, rugose ( Fig. 20B View Fig ). Mesothoracic epimeron subtriangular, dark brown, rugose ( Fig. 20B View Fig ). Mesothoracic episternum same as epimeron, with inconspicuous sinuous longitudinal carina ( Fig. 20B View Fig ). Metapleural region smooth, shiny, light brown ( Fig. 20B View Fig ). Thoracic sterna smooth, dark brown with longitudinal medial wide black spot. Probasisternum shiny. Meso- and meta-basisternum opaque. Mesobasisternum with conspicuous circular medial sclerite, light brown.

Legs. All legs dorsally dark brown, ventrally light brown; anteriorly and posteriorly covered by small setae ( Fig. 20A, B View Fig ). Anterior femur dorsally with two longitudinal parallel carinae. Mid femur posteroventrally with four small spines. Posterior femur dorsally with two longitudinal parallel carinae; anteroventral margin straight; posteroventrally with six small spines in median and apical thirds ( Fig. 20A, B View Fig ). Posterior tibia dorsally with two longitudinal parallel carinae ( Fig. 20A, B View Fig ).

Wings. Tegmina mostly translucid and light brown with light yellow veins ( Fig. 20A, B View Fig ). Radial vein bifurcated in Radial anterior and posterior; Radial anterior short, 6 times shorter than Radial posterior; Radial posterior straight, reaching apical margin. Medial vein bifurcated in Medial anterior and posterior near tegmina base; Medial anterior bifurcated in Medial anterior 1 and 2 right after previous bifurcation; Medial anterior 2 bifurcated in Medial anterior 2-1 and 2-2; all Median bifurcations straight, with only Medial anterior 1 reaching the apex of tegmina. Posterior wing with anal area pale ( Fig. 20A, B View Fig ).

Abdomen. Terga 1-6 rectangular, longer than wide, light brown, smooth, with longitudinal medial carina. Tergum 8 trapezoidal, 1.3 times longer than tergum 9 and 1.8 times longer than tergum 10. Tergum 9 rectangular, two times wider than long. Tergum 10 with straight basal margin, slightly curved lateral and apical margin; apical margin convex. Abdominal sterna dark brown, with disperse granules. Sternum 1 rectangular, wider than long. Sterna 2-6 rectangular, two times wider than long. Sterna 4-9 with with small setae. Sternum 7 trapezoidal, 1.5 times longer than sternum 8 ( Fig. 21A View Fig ). Sternum 8 rectangular, 2.3 times wider than long, with concave apical margin ( Fig. 21A View Fig ). Subgenital plate with basal margin conspicuously convex, lateral margin arched, convex, apical margin medially with slight emargination ( Fig. 21A View Fig ). Vomer with widened base and almost straight lateral margin; apically acute, black ( Fig. 21B View Fig ).

Genitalia ( Fig. 22 View Fig ). In dorsal view: dorsal left sclerite weakly pigmented, with connection to basal pouch arched, widened; apex conspicuously widened, with all margins convex; closer to dorsal wall of the genitalia, but no attached to it. Basal pouch bacilliform. Internal sclerite, two times shorter than basal pouch, with shape resembling an inverted comma, attached to dorsalmost wall of the genitalia. Ventral lobe subdivided in lower and upper lobule; upper lobule with one bifid finger-like projection at anterior margin.

Variations. The paratype has the whole-body light brown. The deep dark brown coloration of the head and thorax of the holotype may be like this due to drying conditions.

Measurements (mm). Body length 35.0-35.8; dorsal head length 1.8; pronotum 1.9-2.1; mesonotum 3.0-3.4; anterior femur 7.4-7.6; anterior tibia 5.1-5.3; mid femur 4.3; mid tibia 4.5; posterior femur 9.8-10.0; posterior tibia 8.2-8.4.

Type condition. Holotype: mid left leg missing.

Paratype: lost in September 2018 fire of the MNRJ.

Geographical records. Brazil, Rio de Janeiro: Itatiaia.

Remarks. Di. ramusculus sp. nov. is morphologically similar to Di. grylloides and Di. museunacional sp. nov., especially at the terminalia morphology. It can be differentiated from Di. grylloides by having the slightly emarginated apical margin of subgenital plate (deeply emarginated in Di. grylloides ) and from Di. museunacional sp. nov. by the conspicuously convex basal margin of subgenital plate and vomer with lateral margin almost straight (concave basal margin of subgenital plate and sinuous lateral margin of vomer in Di. museunacional sp. nov.).