Dorachosa guimararesensis, Sanborn, 2024

Dorachosa guimararesensis sp. nov.

( Figs. 5–6 View Figure 5 View Figure 6 )

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Type material: Holotype. “ Chap. Guimarãres / M.T. / 12–I–1987 / K. Tanizaki ” ♂ ( DZRJ).

Etymology. The name is a combination of guimarares - (for the type locality of Chapada dos Guimarãres) and - ensis (L., suffix denoting place, locality) in reference to the site where the holotype originated.

Remarks. This new taxon is one of a group of species within the genus that possesses a transverse fascia across the pronotal ambient fissure. It is the only species in the group which has the transverse fascia extending across the lateral pronotal collar. In addition, the shapes of the claspers and pygofer basal lobe appendages quickly distinguish the species within the genus.

Diagnosis. Dorachosa guimararesensis sp. nov. is one of a few species of the genus possessing a transverse band through the pronotal collar ambient fissure. Dorachosa tigrina (Boulard, 1986a) is a very similarly colored species but differs in the basal lobe appendages terminate in a recurved point and extend at an angle from the basal pygofer lobes that form an approximate right angle at their terminus when viewed laterally rather than extending like a pyramid from the terminus, the upper pygofer is broadly rounded and not folded laterally, the body length is slightly shorter, the fore wings are shorter and narrower with a ratio of about 2.79 rather than 2.51 found in the new species, and the secondary fore femoral spine is more erect and distinctly curved rather than being angled and parallel to the tertiary spine. The transverse fascia in the pronotal collar ambient fissure does not extend across the lateral pronotal collar, the mesothoracic markings include markings around the lateral sigillae, and there are piceous markings on the postclypeus in Dorachosa castanetorquata (Sanborn, 2020b) . The transverse pronotal fascia in the ambient fissure does not extend across the lateral pronotal collar and the prothoracic markings are reduced in Dorachosa nigrotorquata (Sanborn, 2018) and Dorachosa viriventris (Sanborn, 2020b) . The transverse piceous band does not cross the dorsal pronotal midline or extend across the lateral pronotal collar in Dorachosa grammosticta (Sanborn 2020a) .

Description.

Ground color of greenish-tawny marked with piceous and castaneous, posterior abdominal tergites greenish. The variable amount of green on the different segments and the abdominal tergites suggests fresh specimens may be greener than the majority of the holotype specimen.

Head. Head slightly wider than mesonotum, ground color with castaneous, roughly triangular mark extending anteriorly from lateral median ocellus on either side of midline anterior to median ocellus expanding anteriolaterally to half distance of frontoclypeal suture, lateral ocelli surrounded by castaneous, mark extending across midline, producing ground color triangular mark on posterior epicranial suture, and posteriorly to posterior head, posterior mark extending laterally to posterior eye, mark extending anteriorly from posterior head, bifurcating to encircle posterior cranial depression and attaching to eye margin at level of lateral ocellus, castaneous spot in center of anterior extension of vertex, small castaneous mark on eye margin lateral to vertex spot. Ocelli rosaceous, eyes castaneous. Dorsal head radiating long piceous pile, long silvery pile posterior to eye. Ventral head ground color except for castaneous fascia on posteromedial margin along anteclypeus. Postclypeus ground color ventrally, centrally sulcate from anterior to posteroventral margin to apex, with twelve transverse ridges, radiating long piceous pile from transverse grooves. Anteclypeus dark castaneous, carina lighter with near ground color spot medially. Ventral head and anteclypeus with long white pile, lorum and gena radiating long piceous pile. Mentum ground color, labium castaneous with piceous tip, reaching to hind coxae. Antennal segments scape ground color at base, thick castaneous annulus on distal half, distal margin ground color, pedicel castaneous with ground color annuli on each end, remaining antennal segments light castaneous.

Thorax. Dorsal thorax ground color. Pronotum ground color, piceous within paramedian fissure, lateral extension near anterior of fissure, anterior extension curving lateral from medial end of piceous, triangular castaneous mark connecting to posterior lateral fissure, marks in paramedian fissures connected across midline by V-shaped castaneous mark, all but middle of lateral fissure piceous, piceous in ambient fissure from connecting anterior and posterior section of piceous mark in lateral fissure, ambient fissure castaneous across dorsal midline between piceous regions, radiating long piceous pile. Pronotal collar ground color with transverse castaneous fascia abutting ambient fissure, extending laterally across lateral part of pronotal collar just anterior to pronotal collar lateral angles, radiating long piceous pile. Mesonotum ground color, castaneous marks outlining submedian sigillae, thicker along medial margins, expanding in posterior submedian sigilla, anchor-shaped castaneous mark on midline posterior midline curving anterior to anterior arms of cruciform elevation and terminating in scutal depressions, posterior margin of mesonotum castaneous posterior to lateral sigillae, cruciform elevation ground color except castaneous anterior margin posterior to anterior arm extending around anterolateral corner, castaneous fascia on posterolateral wing groove. Metanotum ground color with castaneous spot in anterior wing groove. Short golden pile on mesothorax between anterior arms of cruciform elevation, long silvery pile on lateral mesothorax, posterior mesothorax, radiating from posterior wing groove, and on lateral metanotum, long piceous pile radiating from mesothorax, on cruciform elevation between lateral arms, and radiating from lateral metanotum. Ventral thoracic segments ground color covered with short silvery pile, radiating long silvery pile, long piceous pile radiating from lateral anepisternum 2.

Wings. Fore wings and hindwings hyaline, with eight and six apical cells respectively. Venation castaneous proximally, becoming darker distally, except ground color cubits posterior + anal vein 1, piceous posterior proximal half of anal vein 2 + 3, pterostigma present, completely infuscated. Fore wing margin edge infuscated. Basal membrane grayish with darker posterior. Hindwing venation castaneous becoming darker distally except ground color distal half of median vein. Anal vein 3 about half the length of anal vein 2 with curved distal terminus. Anal cell 3 and plaga gray proximally, anal cell 2 along anal veins 2 and anal vein 3 to curve, anal cell 1 along anal vein 2 margined with gray, gray margined with infuscation. Hindwing margin edge infuscated.

Legs. Ground color except castaneous stripe on fore femora, distal tibiae, distal metatarsi, distal mesotarsi, distal half of pretarsi and distal pretarsal claws castaneous, long silvery pile radiating from legs. Fore femora with proximal spine longest, angled more to femoral axis than remaining spines, secondary spine and tertiary spines more erect and parallel to each other, secondary and tertiary spines about the same length with curved tip, very small apical spine emerging from distal base of tertiary spine. Spines castaneous with piceous base. Tibial spurs and comb castaneous. Meracanthus triangular, ochraceous with light castaneous marks on anteromedial base and posterolateral margin, reaching anterior of medial opercular margin.

Opercula. Male operculum ochraceous with small castaneous spot on near anterolateral corner, covered with short silvery pile and radiating long silvery pile, angled mediad, lateral base bent dorsally on lateral body, lateral margin straight, curved posterolateral margin forming obtuse angle to straight posterior margin, with finger-like posteromedial extension, semicircular medial margin, not meeting medially reaching to medial meracanthus, not covering tympanum, only medial region reaching to anterior of medial sternite II.

Abdomen. Abdominal tergites ground color green posterior margin, castaneous spot on lateral tergites 4–8, tergite 8 with castaneous posterior margin, auditory capsule castaneous, tergites covered with short silvery pile laterally, piceous pile dorsally, pile denser on posterior timbal cavity and on auditory capsule. Timbal exposed, white marked with ten long ribs and nine intercalary ribs, ribs castaneous. Male sternites ground color, sternites 5–8 with light castaneous midline fascia becoming darker and longer in posterior sternites, sternites radiating silvery pile, pile very dense on midline of sternites I and II, long castaneous pile on midline of sternite II. Epipleurites ground color, radiating long silvery pile.

Genitalia. Male pygofer ground color with castaneous dorsal beak.Dorsal beak narrow, longer than light castaneous anal styles, anal tube radiating golden pile. Pygofer basal lobe about half the length of pygofer, angled laterad at base, curving mediad with rectangular apex, radiating dense golden pile. Upper pygofer lobes adpressed to pygofer, small, knob-like, radiating long golden pile. Claspers expanding along sides of anal tube, distal midline curving dorsally and almost meeting posterior to anal styles, claspers diverge at an acute angle to approximate right angled distolateral corner, radiating long golden pile. Castaneous basal lobe appendage rectangular with medial depression, flattened terminus presenting straight posterior margin. Aedeagus tubular, dark castaneous.

Female is unknown.

Measurements (mm). Length of body: 15.25; length of fore wing: 20.05; width of fore wing: 8.00; length of head: 3.20; width of head including eyes: 5.75; width of pronotum including suprahumeral plates: 6.20; width of mesonotum: 5.25.

Distribution. The new species is known only from the holotype specimen collected the Chapada dos Guimarães (15°27’39”S, 55°45’00”W) in the state of Mato Grosso, Brazil. The majority of the Rio da Casca Ecological Station is located at Chapada dos Guimarães which should help to protect the new species.