Tortopus coreguaje, Molineri & Dias & Zúñiga, 2021

Molineri, Carlos, Dias, Lucimar G. & Zuniga, Maria del Carmen, 2021, New insights into the phylogeny of Tortopus Needham and Murphy and Tortopsis Molineri (Ephemeroptera, Polymitarcyidae) with description of three new species, Arthropod Systematics & amp; Phylogeny 79, pp. 151-170 : 151

Tortopus coreguaje sp. nov. Figs 56-64 , 65-70

Type material.

Holotype male imago (CEBUC) from Colombia, Caquetá, Curillo, río Caquetá, 220 m, 01°01 ’44” N; 75°55 ’9” W, 20.ix.2018, LG Dias, MC Zúñiga, B Toro, JP Chaux and C Molineri cols. Paratypes: 1 male imago (IBN) and 1 nymph (CEBUC), same data as holotype.

Diagnosis.

Tortopus coreguaje sp. nov., known from male imago and nymph, can be distinguished from all other species of the genus by the following combination of characters: In male imagos, 1) fore wing length 10.9-11.0 mm (male); 2) pale wings, veins translucent gray; 3) pedestal short with relatively large, straight and very long parastyli (Figs 56-57 , 67 and 69 ) (parastylus 2.6 times the length of pedestal base, in lateral view the parastylus reach 0.37 of the length of forceps from base); 3) ventral knob on forceps base relatively small; 4) penis relatively thin at base (fused portion), not strongly expanded distally (Figs 56 and 67 ); and 5) relatively dark species, head shaded stronger between lateral ocelli, occiput shaded gray except on pale medial line (Fig. 65 ). In the nymph: 1) inner protuberances on mandibular tusk almost contiguous (Figs 59-61 ); 2) frontal tuft of setae with irregular sinuous form (arrow in Fig. 58 ); 3) ventral and dorsal projection at the apex of fore tarsus subequal in length (Fig. 63 ). Male imago. Length (mm): body, 11.0; fore wing, 10.9-11.0; hind wing, 4.8; cerci, 28.0. General coloration yellowish white shaded with gray (Fig. 65 ). Head. Coloration yellowish white shaded widely with gray on dorsum, shaded stronger between lateral ocelli, except around median ocellus and hind margin (Fig. 65 ). Antennae: scape and pedicel yellowish white completely shaded with gray, flagellum hyaline. Thorax. Pronotum with anterior ring hyaline, shaded with black posterolaterally (Fig. 65 ); posterior ring shaded gray except on sublateral areas and medial line. Mesonotum whitish yellow shaded with gray along medioparapsidal sutures and shaded with black on a V-shaped mark between posterior scutal protuberances (Fig. 65 ). Metanotum whitish yellow shaded gray medially. Thoracic pleura and sterna whitish yellow, with grayish small marks medially on furcasterna. Legs yellowish white shaded with grayish (fore legs broken off and lost). Wings: Membrane hyaline except basally slightly grayish, longitudinal and cross veins translucent shaded slightly with gray. Abdomen. Abdominal segments translucent-hyaline. Tergum I shaded gray anterolaterally (Fig. 65 ), terga II-IX shaded more extensively towards rear segments, except on: medial line of terga II-VII, and two pale marks (one submedian and one sublateral) in II-IX; tergum X shaded more completely with gray. Abdominal sterna shaded widely with brownish gray except on intersegmental membranes and around gill sclerites (Fig. 66 ). Genitalia (Figs 56-57 , 67-69 ): sternum IX shaded with black on posterior margin and at both sides of the median furrow; relatively large parastyli orangeish, straight and long (Fig. 56 ); parastylus 2.6 times the length of pedestal base, in lateral view the parastylus reach 0.37 of the length of forceps from base; forceps and penis yellowish white, shaded gray on forceps. Caudal filament whitish translucent.

Male nymph (immature). Length: body, 9.5 mm; cerci, 2.5 mm; caudal filament, 2.0 mm. General coloration whitish shaded with gray (Fig. 70 ). Head. Head shaded with gray in net-shaped pattern posteriorly to epicranial suture (Fig. 70 ); anteriorly to this suture with two small lateral irregular-sinuous-shaped tufts of short setae (anterior to lateral ocelli, arrow in Fig. 58 ); frontal ridge relatively straight in dorsal view (Fig. 58 ); fronto-clypeal region acutely projected medially (Fig. 58 ); a tuft of ca. 10 long setae basally to antennal condyle; and a group of 3 long setae anterior to eye and 6 long curved setae posterior to eye (Fig. 58 ). Mandibular tusks straight (Figs 59-61 , 70 ), with 2 subdistal rigid inner setae and ca. 12 weaker but long setae forming a basal arc (Figs 59-61 ); inner margin with two large and contiguous tubercles, the subdistal directed ventrally and the submedian directed medially (Figs 59-61 ), also a small blade-like projection present basally to distal spur (arrow in Fig. 61 ). Maxillae with small triangular ventral gill. Hypopharynx and labium whitish. Thorax. Pronotum with narrow anterior ring (0.28 of total length of pronotum); antero-lateral corners acutely projected; shaded with black laterally on anterior ring and medially on posterior ring. Meso and metanotum shaded black medially except medial line; wingbuds whitish shaded gray only at base of costal area. Legs. Whitish with yellowish setae and sclerotized portions. Foreleg with tibia-tarsus flattened, remnants of the suture between tarsus and tibia visible, tarsal dorso-distal projection 0.5 of total length of claw (Figs 62-63 ); ventral surface of fore tibia with rows of long filtering setae as in Fig. 62 ; fore femur with anterobasal short U-shaped row of filtering setae and an immediately posterior small group of ca. 7 long rigid and simple setae; apex of fore tarsus with ventral and dorsal projections subequal in length (but the ventral is much thinner, Fig. 63 ). Middle leg with long setae on anterior and posterior (functionally ventral and dorsal, respectively) margins of femur, anterior margin of tibia and tarsus; apical third of tibia and tarsus completely covered with strong setae, apex of tibia with a brush of thick setae ventrally. Hind leg with short strong setae on posterior margin, and transverse subdistal row of short setae on dorsal surface; hind tibia and tarsus with long setae on posterior margin, anterior margin covered with short and strong setae. All tarsal claws slender and curved, without denticles. Abdomen (Fig. 70 ). Gill I single, small and elongated, remaining gills well developed and double. Terga II-IX with medio-longitudinal row of setae; abdominal sterna with lateral margins strongly covered with setae, increasing in number posteriorly, sterna V-VI also with row of shorter setae on posterior margin; sternum IX with a row of few long setae on posterior half, along medial line. Cerci with rows of setae at each article, mainly on basal fourth; terminal filament much thinner and with whorls of setae almost on its entire length.

Etymology.

This species is dedicated to the Coreguaje community inhabiting along the piemont and lower parts of the Caquetá River and its affluents.

Distribution.

Known only from the type locality.

Figures

Figures 56 - 64. Tortopus coreguaje sp. nov., male imago. 56, genitalia, ventral view (left forceps omitted); 57, genitalia, lateral view. Nymph: 58, head outline and setation, dorsal view (tusks omitted); 59, right mandible, inner view; 60, left mandible, inner view; 61, same, detail of apex (arrow indicates blade-like projection); 62, fore leg, ventral view (rows of filtering setae delineated); 63, fore tarsal claw; 64, hind tarsal claw.

Figures 65 - 70. Tortopus coreguaje sp. nov., male imago: 65, general view, dorsal; 66, abdomen, ventral view; 67, genitalia, ventral view; 68, detail of parastylus (A = length of parastylus, B = length of pedestal); 69, genitalia, lateral view. Nymph: 70, general view, dorsal.