Apobaetis sabinoae De Lima & Cruz & Hamada 2024, sp. nov.
Creators: name: De Lima, Claudia R. T.
name: Cruz, Paulo Vilela
name: Hamada, Neusa
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Apobaetis
Apobaetis sabinoae

description: Apobaetis sabinoae sp. nov.
(Figures 1–3)
Material examined. Holotype. Male nymph (on slide), BRAZIL, Roraima state, Caracaraí, Balneário Bem-querer, 01º55′46.3″ N, 61º00′06.9″ W, 25.iii.2012, colls. Hamada, N., Cruz, P., Dantas, G. and Boldrini, R., INPA. Paratypes: 1 nymph (on slide), same data as holotype; 4 nymphs, same data as holotype; 5 nymphs (on slide), 8 nymphs, Roraima state, Caracaraí, ramal for Balneário Bem-querer, 01º56′01.3″ N, 61º01′38.4″ W, 21.iii.2013, colls. Hamada, N., Cruz, P., Dantas, G. and Boldrini, R., INPA.
Description. Mature male nymph. Body: 2.3–2.6 mm (1A–C). Head. Coloration: cream. Antenna. Flagellum with minute spines on apex of each flagellomere. Labrum (Figs. 2A–B). Length 0.6× maximum width; distal medial margin slightly concave; dorsal surface with 3–4 long and blunt medial setae near distal margin, one row of long, thin, and simple setae arranged parallel to the distal margin and long, thin and simple setae scattered over all surface; ventral surface with one row of robust spine-like setae on distolateral and distal margins. Left mandible (Fig. 2C). Outer and inner set of incisors with 4 and 3 denticles, respectively; prostheca robust, bifid at apex, outer lobe robust, inner lobe slender with a medial tuft of setae; margin between prostheca and mola concave, wide subtriangular process, with short protuberance on distal margin; tuft of setae at base of subtriangular process; denticles of mola not constricted, with 4 prominent denticles; lateral margin convex. Right mandible (Fig. 2D). Outer and inner set of incisors with 3 denticles each; prostheca slender, bifid at apex; margin between prostheca and mola concave; tuft of setae at base of mola absent; denticles of mola not constricted; lateral margin convex. Hypopharynx (Fig. 2E). Lingua subquadrangular, apex covered by tuft of short setae, length subequal to superlingua; superlingua oval with narrow base, with short and thin setae on distolateral and distal margin. Maxilla (Fig. 2F). Maxillary palp long, 2.3× length of galea-lacinia; segment I subequal to galea-lacinia, with prominent palpifer; segment II narrow from base to apex, with thin and simple setae over surface, apex without constriction. Labium (Fig. 2G–H). Glossa robust from apex to base, subcircular at apex, length subequal to paraglossa; dorsal surface with one longitudinal row of 4 short spine-like setae on apical third, near inner margin, 2 short spine-like setae and 1 thin and simple setae on apex (Fig. 2H); one longitudinal row of 7 robust spine-like setae on apical half, near outer margin; ventral surface covered by long, thin, and simple setae and 1 minute spine-like setae on apex. Paraglossa curved inward; dorsal surface with one longitudinal row of 12 long spine-like setae on apical half on outer margin and one longitudinal row of 5–6 long and robust spine-like setae on apical half near inner margin; ventral surface with one longitudinal row of 5–6 long and robust spine-like setae on apical half at middle. Labial palp with segment I robust, 0.8× length of segments II and III combined, covered by micropores (not illustrated); segment II with outer margin covered by thin, long and simple setae, inner margin bare; distomedial projection of segment II triangular and elongated, with distal margin almost straight, laterally directed; ventral surface of distomedial projection with tuft of thin, long and simple setae; segment III rectangular, with distal margin slightly concave, length 0.6× width, covered by thin, long and simple setae on outer margin, dorsally with one row of 8 to 10 robust spine-like setae in different sizes near distal margin, ventrally with one row of 7 to 8 robust spine-like setae in different sizes near distal margin. Thorax. Pigmentation (Figs. 1A–C). Cream, legs without marks. Foreleg (Figs. 3A–B). Femur. Anterior surface with one row of 6 to 7 short, concave and blunt setae near dorsal margin; apex with 2 short, concave and blunt setae; ventral margin with one row of 9 to 10 spine-like setae in different sizes on basal 2/3. Tibia. Dorsal margin bare; ventral margin with one row of 9 to 11 spine-like setae. Patella-tibial suture present, from dorsal to ventral margin. Tarsus. Dorsal margin bare; ventral margin with one row of 10 to 11 spine-like setae. Tarsal claw. 0.7–0.8× length of tarsus, row of denticles absent. Middle and hind legs similar to foreleg. Abdomen. Pigmentation (Figs. 1A–C). Cream, tergum V with lateral brown mark. Terga (Fig. 3C). Sculpting of abdominal terga in form of triangular scale-like; tergal surface covered by micropores. Tergum IV (Fig. 3C). Posterior margin with triangular pointed spines longer than wider. Gills (Fig. 3D). Triangular apex, conspicuous trachea; long, extending to the beginning of third subsequent tergum. Paraproct (Fig. 3G). Ten to eleven marginal spines; posterolateral extension with blunt spines. Cerci (Fig. 3E). Lateral short spines on all segments. Paracercus (Fig. 3F). Lateral short spines on alternate segments.
Imago: Unknown.
Etymology. The specific name is a tribute to Dr. Ester Cerdeira Sabino, a Brazilian immunologist from the Instituto de Medicina Tropical from São Paulo, who led the team that carried out the complete sequencing of the genome of the coronavirus (SARS-CoV2) in 48 hours after the first confirmed case in Latin America. Noun in the genitive case.
Diagnosis. Mature nymph. 1) Distal medial margin of labrum slightly concave (Fig. 2A); 2) dorsal surface of labrum with 3–4 long and blunt medial setae near distal margin (Figs. 2A–B); 3) lingua subquadrangular, apical tuft of setae present, length subequal to superlingua (Fig. 2E); 4) maxillary palp long, 2.3× length of galea-lacinia, with prominent palpifer; segment II without apical constriction (Fig. 2F); 5) segment II of labial palp with triangular and elongated distomedial projection; segment III subretangular, with distal margin slightly concave (Fig. 2G); 6) glossa robust, from apex to base, subcircular at apex, length subequal to paraglossa (Fig. 2G); 7) anterior surface of foreleg with one row of 6–7 short, concave and blunt setae near dorsal margin of femur; 8) claw 0.7–0.8× length of tarsus, without row of denticles (Figs. 3A–B); 9) posterior margin of tergum IV with triangular pointed spines, longer than wider (Fig. 3C); 10) paraproct with several marginal spines, posterolateral extension with blunt spines (Fig. 3G).
description: Published as part of De Lima, Claudia R. T., Cruz, Paulo Vilela & Hamada, Neusa, 2024, Five new species of Apobaetis Day (Ephemeroptera: Baetidae) and updated key to nymphs, pp. 91-115 in Zootaxa 5397 (1) on pages 92-96, DOI: 10.11646/zootaxa.5397.1.5, http://zenodo.org/record/10468376