Dinelytron ramusculus,

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

http://doi.org/ 10.1016/j.jcz.2020.01.005

DOI

http://doi.org/10.5281/zenodo.3716934

persistent identifier

http://treatment.plazi.org/id/9D0A8794-FFD8-0675-0668-600EB861EFBE

treatment provided by

Plazi

scientific name

Dinelytron ramusculus
status

sp. nov.

Dinelytron ramusculus  sp. nov.

Fig. 20A-CView 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. 20CView Fig). Subgenital plate with basal margin conspicuously convex, apical margin medially with light emargination ( Fig. 21AView Fig). Vomer with widened base and almost straight lateral margin ( Fig. 21BView Fig). In dorsal view ( Fig. 22View 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, BView Fig). Frontal suture inconspicuous, forming a triangular conspicuous dark brown sulcus ( Fig. 20CView 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, DView Fig). Area between clypeus and labrum ovoid, small, conspicuous ( Fig. 20C, DView Fig). Labrum symmetrical, dark brown with conspicuous light-yellow spot medially ( Fig. 20C, DView Fig). Antenna with flagellum dark brown ( Fig. 20AView 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. 20CView Fig).

Thorax. Dorsally dark brown, with light brown spots ( Fig. 20AView Fig). Pronotum with inconspicuous longitudinal medial sulcus, 1.6 times longer than wide ( Fig. 20AView Fig). Mesonotum 1.6 times longer than pronotum, with conspicuous longitudinal medial carina ( Fig. 20AView Fig). Metanotum dark brown. Coxopleurite dome-like in shape, dark brown, rugose ( Fig. 20BView Fig). Mesothoracic epimeron subtriangular, dark brown, rugose ( Fig. 20BView Fig). Mesothoracic episternum same as epimeron, with inconspicuous sinuous longitudinal carina ( Fig. 20BView Fig). Metapleural region smooth, shiny, light brown ( Fig. 20BView 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, BView 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, BView Fig). Posterior tibia dorsally with two longitudinal parallel carinae ( Fig. 20A, BView Fig).

Wings. Tegmina mostly translucid and light brown with light yellow veins ( Fig. 20A, BView 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, BView 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. 21AView Fig). Sternum 8 rectangular, 2.3 times wider than long, with concave apical margin ( Fig. 21AView Fig). Subgenital plate with basal margin conspicuously convex, lateral margin arched, convex, apical margin medially with slight emargination ( Fig. 21AView Fig). Vomer with widened base and almost straight lateral margin; apically acute, black ( Fig. 21BView Fig).

Genitalia ( Fig. 22View 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.).

MNRJ

Museu Nacional/Universidade Federal de Rio de Janeiro