Harpagobaetis brigada Cruz & Hamada 2019, sp. nov.
Creators: name: Cruz, Paulo Vilela
name: Hamada, Neusa
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Harpagobaetis
Harpagobaetis brigada

description: Harpagobaetis brigada sp. nov.
(Figs 1–6)
Diagnosis. Mature nymph. 1) labrum without setae along lateral margin (Fig. 3C); 2) maxillary palp twosegmented (Fig. 3E); 3) second maxillary canine as long as others (Fig. 3E); 4) paraglossa with base overlapping the glossa (Fig. 4B); 5) middle part of anterior surface of femur without setae (Fig. 5A); 6) claws without apical seta (Figs 5D, 5E, 5F); 7) rows of denticles less than half of length of claw (Fig. 5D); 8) posterior margin of terga IV with rounded projections (Fig. 6A); 9) gills with tracheae translucid (Fig. 1C).
Description. Mature nymph (Figs 1–6). Body length 3.49–3.54 mm (n=2); cercus length 1.78–1.81 mm (n=2). Head yellowish (Figs 1 D–F). Antenna short, 2.0 length of head capsule and with spines and simple setae on the apices of the segments (Fig. 3A). Turbinate eye of the nymph with orange-brown surface (Fig. 1D). Labrum length about 0.40 the maximum width; distal margin on ventral surface with one row of small blunt setae medially; one row of small spine-like setae continuous from distal margin to distolateral and lateral margins; distal margin on dorsal surface with one row of small thin setae and one row of setae continuous from distal margin to distolateral and lateral margins; dorsal surface covered with thin simple setae (Figs 3B, 3C). Left mandible (Fig. 3D) long and narrow, incisor completely fused, with four denticles; prostheca robust, apically with seven denticles; mola shaped like an incisor, tuft of setae between prostheca and mola absent; lateral margins almost straight, bare dorsally. Right mandible (Fig. 3F) long and narrow, incisor completely fused, with five denticles, prostheca developed, apically with three denticles; mola shaped like an incisor, tuft of setae between prostheca and mola absent; lateral margins almost straight, bare dorsally. Maxilla (Fig. 3E) with three canines long and slender plus one distal dentiseta in the same direction; row of setae proximad of canines reduced to two setae and two teeth-like setae; medially, on inner margin, with one spine-like seta. Maxillary palp two-segmented and long, 1.31 length of galea-lacinia; length of segment I 0.17 length of segment II; segments I and II covered with short and thin setae. Hypopharynx (Fig. 4A) large; lingua longer than superlingua, covered with short and thin setae; superlingua with lateral expansion and covered with short and thin setae over inner and distal margin. Labium (Fig. 4B) with paraglossa with base overlapping the glossa; glossa narrow, longer than paraglossa, inner margin bare, distal margin with five robust spine-like setae, outer margin with one row of robust spine-like setae, ventral surface with three simple setae; paraglossa ventral surface with one simple seta, distal margin with four long robust spine-like setae, inner margin with one row of long robust spine-like setae on apical third, outer margin with one row of long robust spine-like setae on apical half. Labial palp three-segmented, with length of segment I 0.61 lengths of segments II and III combined, outer margin with few thin setae; segment II outer margin with long thin setae, inner margin of segment II without distomedial projection; segment III globular-oval, outer margin with many long thin setae. Thorax. Dark brown, fore and hind protoptera with cuticle colorless (Figs 1 A–C). Legs. Femur (Figs 5 A–F) yellowish, anterior surface with black mark at base and two yellowish marks, one medially and other apically; anterior surface covered with pores, dorsal margin with one row of small blunt and concave setae (which sometimes resemble spine-like setae), anterior surface near dorsal margin with one row of small blunt setae, anterior surface near ventral margin with one row of small blunt setae, ventral margin bare; tibia with one row of robust spine-like setae on ventral margin and few robust spine-like setae on anterior surface, patella-tibial suture present on all legs and shorter than half the length of tibia; ventral margin of tarsus with one row of robust spine-like setae; claw short, less than the half the length of tarsus, with two rows of triangular denticles increasing in size distally, denticles apically directed, without setae. Mid and hind legs similar to foreleg, except claws with the two apical pairs of denticle disproportionately larger than others. Abdomen with terga I, II, VIII, IX and X white, with brown medial mark (Figs 1 A–C); terga III–VII dark brown (Figs 1 A–C). Terga surface creased, covered with pores (Figs 1C, 6A), without scales or scale-like setae, posterior margin with irregular blunt projections in segments III–VII, absent in I– II, and almost pointed in VIII-X. Gills yellowish, on segments I–VII, length of gill I (Fig. 6B) 2.0 length of segment II, length of gill IV (Fig. 6C) 1.50 length of segment V; all gills with tracheae translucid (Figs 3 A–C), margins with short and thin setae, surface covered with pores. Paraproct (Figs 1C, 8D) covered with pores, with about 20 spines, postero-lateral extension with marginal spines. Cerci (Figs 1A, 6E) white, with dark brown band on apical third, segments with spines on outer margin, posterior margin without spines; primary swimming setae on basal third segments present only in apex of inner margin; all other segments with primary swimming setae all along inner margin, short, colorless; secondary swimming setae absent. Paracercus (Figs 1A, 6F) as long as cerci, white, with dark brown band on apical third, segments without spines; primary swimming setae on basal third segments present only in apex of inner margin; all other segments with primary swimming setae all along inner margin, short, colorless.
Etymology. The specific epithet, in apposition, is in honor of the men who fight criminal fire in the Brazilian national parks, especially those in the PNCA, who always joyfully provided logistical support for collection of this new taxon, making our field work pleasant. The name of this fire brigade in Portuguese is " brigada. "
Material examined. Holotype: one nymph mounted on slide, Brazil, Amazonas state, Manicoré county, Parque Nacional Campos Amazônicos (PNCA), Veado stream, tributary of Macaco stream, 07.vii.2017, S 8° 26’ 27.44” W 61° 39’ 37.42”, P.V. Cruz col. (INPA). Paratypes: one nymph mounted on slide, same locality and date as holotype (INPA); three nymphs in 80% ethanol, same locality and date as holotype (INPA).
description: Published as part of Cruz, Paulo Vilela & Hamada, Neusa, 2019, A new species of Harpagobaetis Mol, with amended diagnosis of the genus, and new considerations on predatory species of Baetidae (Ephemeroptera) from South America, pp. 195-210 in Zootaxa 4551 (2) on pages 197-200, DOI: 10.11646/zootaxa.4551.2.4, http://zenodo.org/record/2622786