Rachicerus isabelae Pujol-Luz, 2025

Rachicerus isabelae Pujol-Luz , new species

( Figs 3–5 View FIGURES 3–5 )

Diagnosis. Body dark brownish; yellow cerci; antenna with pectinate falciform-shaped flagellomeres.

Measurements: body length: 8.7 mm; antenna: 1.3 mm; number of antennal flagellomeres: 16; wings: 7 mm.

Head: hemispherical, wider than thorax; front flat, shining brown, with two longitudinal ridges running from ocellar plate and converging on a suture that divides antennal plate in half; frontal plate large with small whitish setae (pruinosity like) ventrally, around antennae; fronto-orbital plate depressed and bare. Compound eyes dichoptic and bare; vertex brownish with ocellar triangle developed with tuffs of small bristles; ocellus brownish yellow. Occiput brownish, well developed, and pilose. Palpus yellowish, club-like and bi-segmented. Labellum yellowish and membranous with elongate setae. Antennae elongate, more than two times longer than width of head, with 15 pectinate falciform-shaped flagellomeres, and last one club-like ( Figs. 3–5 View FIGURES 3–5 ). Thorax: predominantly dark brown and bare; postpronotal lobe yellowish white; scutum with sparse pilosity; pleuron entirely bare; scutellum brownish, with dense pilosity. Wings: hyaline, inconspicuous pterostigma between veins Sc and R 1; R S stem curved upwards before bifurcation of radial sectors; halters brownish yellow. Legs: coxae, trochanters, femurs and tibiae brownish; first tarsomeres whitish; empodia pulvilliform. Abdomen: entirely dark brownish, with dense small pilosity, except in second tergite; cercus yellowish, with dense pilosity.

Male. Unknown.

Etymology: This name is given to honor my beloved daughter Isabela.

Geographical distribution. BRAZIL, state of Santa Catarina.

Type material. The female HOLOTYPE is housed in the Museu de Zoologia da Universidade de São Paulo ( MZUSP), São Paulo, São Paulo, Brazil. Labeled: Brasilien, Nova Teutonia [Santa Catarina], 27 o 11’S, 52 o 23’W, Fritz Plaumann col., XI.1962 (300–500 meters) [White label]/ Holótipo [Red label]/ MZ053524 [White label]. The holotype is in good condition, except for the damaged left wing and the right wing, which has been separated and dried stored in a microvial GoogleMaps .