Thraulodes sternimaculatus, Lima, Lucas R. C., Mariano, Rodolfo & Pinheiro, Ulisses, 2013

Lima, Lucas R. C., Mariano, Rodolfo & Pinheiro, Ulisses, 2013, New species for Thraulodes Ulmer, 1920 (Ephemeroptera: Leptophlebiidae: Atalophlebiinae) and the first key to adults from Brazil, Zootaxa 3709 (3), pp. 230-242: 236

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Thraulodes sternimaculatus

sp. nov.

Thraulodes sternimaculatus  sp. nov., Lima, Mariano & Pinheiro

( Figs. 4–5View FIGURES 2 – 9; 12–13; 23–26)

Diagnosis. The adult of this species can be separated from all the other congeners by a combination of the following characters: (1) costal membrane basal to bulla without cross veins ( Fig. 4View FIGURES 2 – 9); (2) costal and subcostal zones of the forewing translucent ( Fig. 4View FIGURES 2 – 9); (3) one band on femora ( Fig. 23View FIGURES 23 – 26); (4) abdominal segments in dorsal view predominantly translucent, with three lateral dark spots on terga II –VII ( Figs. 23, 26View FIGURES 23 – 26); (5) subapical spines of penes short and narrow, apicolateral area not forming an “ear”, lateral pouch present and without recurved folds ( Figs. 12–13View FIGURES 10 – 17).

Male imago. Length: body, 6.5 mm; forewing, 6.5 mm; hind wing, 1.2 mm; general coloration translucent.

Head ( Fig. 23View FIGURES 23 – 26): black; antenna pale with scape dark brown; upper portion of eye reddish brown, lower portion black; ocelli white with a black ring at base.

Thorax ( Figs 23–25View FIGURES 23 – 26): general color of pro-, meso and metanotum brown. Pronotum whitish, medial region with a triangular light brown macula. Meso and metanotum brown with sutures darker; scuto-scutelar suture whitish. Prosternum whitish with brown maculae tinged with black on the corners; mesosternum whitish with furcasternum dark brown.

Wings ( Figs. 4–5View FIGURES 2 – 9): membrane of forewing hyaline, with dark spot near the base; costal and subcostal zones translucent; veins ICu 2 and CuP not joined basally. Longitudinal and cross veins pale yellow. Costal membrane basal to bulla without cross veins, 11 cross veins distal to bulla. Hind wing hyaline with dark spot near base and 6– 8 cross veins.

Legs ( Fig. 23View FIGURES 23 – 26): legs with femur pale yellow, apical 1 / 3 of femur with dark brown band followed by a blackish spot in the median region, and inner margin tinged with black on apical ½; basal half with a light brown spot. Tibiae yellowish with base brown; tarsi pale yellow.

Abdomen ( Figs. 23–24View FIGURES 23 – 26; 26): segments in dorsal view predominantly translucent, with three lateral dark spots on terga II –VII. Terga I –II brown washed with black on anterior margin; terga III –VI translucent with a medial brown spot on posterior margin; tergum VI with anterior area translucent and posterior brown; terga VII and IX –X brown; tergum VIII translucent whitish, with medial line brown. Sterna II –VI translucent with yellowish spots on medial area and VII –X whitish with lateral margins reddish.

Genitalia ( Figs. 12–13View FIGURES 10 – 17): forceps whitish, segment II –III washed with black. Posterior margin of subgenital plate rounded, without projection. Penes yellowish washed with black on ventral lateral region; 2 / 3 of penes divided apically, with a pair of short and narrow subapical spines, 1.2 x the width of penes; apicolateral area not forming an “ear”; external margin forming lateral pouch and without recurved folds parallel to inner margin. Terminal filaments whitish, basal area of segments black.

Female and nymph. Unknown.

Type material. Holotype: one male imago, Brazil, Pernambuco State, Jaqueira, Rio Pirangi, 8 ° 44 '53.0"S, 35 ° 48 ' 51.1 "W, 189m, 23.v. 2012, L.R.C. Lima coll. ( CZNC). Paratype: one male, Brazil, Pernambuco State, Amaraji, Rio Amaraji, 8 ° 21 ' 48.9 "S, 35 ° 28 '49.0"W, 320m, 20.i. 2011, L.R.C. Lima coll. ( IML); same as preceding except one male, 21.iv. 2012 ( IML).

Etymology. The specific epithet is due to maculae on the corners of prosternum.

Remarks. In addition to T. sternimaculatus  sp. nov., only four species have the subgenital plate with posterior margin medially rounded and without medial projection: Thraulodes laetus (Eaton, 1883)  and T. papilionis Traver & Edmunds, 1967  from Colombia, T. mucuy Chacón & Domínguez, 1999  from Venezuela, and T. regulus Traver & Edmunds, 1967  from Peru. Thraulodes sternimaculatus  sp. nov. seems to be more related to T. laetus  and T. papilionis  , i.e both are small species (body length up to 8.0 mm), with abdominal segments lighter (whitish or translucent), forewing membrane hyaline and without costal cross veins basal to bulla. The new species can be separated from them by the presence of a lateral pouch, penes short and narrow, apicolateral area of penes not forming an “ear” and recurved folds absent.


Instituto Miguel Lillo