Apobaetis danielae, De Lima & Cruz & Hamada, 2024

De Lima, Claudia R. T., Cruz, Paulo Vilela & Hamada, Neusa, 2024, Five new species of Apobaetis Day (Ephemeroptera: Baetidae) and updated key to nymphs, Zootaxa 5397 (1), pp. 91-115 : 108-111

Apobaetis danielae sp. nov.

( Figures 13–14 )

Material examined. Holotype. Mature nymph (on slide), BRAZIL, Piauí, Rio Grande do Piauí, Povoado Araticum , 7º46′41.66″ S, 43º08′14.21″ W, 31.v.2011, colls. Hamada, N., Cruz P. V. and Querino R. B., INPA . Paratype: Nymph (on slide), same data as holotype, INPA .

Description. Mature nymph. Head. Antenna. Flagellum with minute spines on apex of each flagellomere. Labrum ( Figs. 13A–B ). Length 0.5× maximum width; distal medial margin slightly convex; dorsal surface with 4 bifid and long medial spine-like 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. 13C ). Outer and inner set of incisors with 3 denticles each; 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 3 elongated denticles; lateral margin convex. Right mandible ( Fig. 13D ). Outer and inner set of incisors with 3 and 2 denticles, respectively; 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. 13E ). Lingua subquadrangular, apex covered by tuft of short setae, length subequal to superlingua; superlingua oval with narrow base, with thin setae on distolateral and distal margin. Maxilla ( Fig. 13F ). Maxillary palp long, 1.5× length of galea-lacinia; segment I robust 0.6× length of galea-lacinia; segment II with thin and simple setae over surface, apex without constriction. Labium ( Fig. 13G ). Glossa robust, from apex to base, subtriangular at apex ( Fig. 13H ), length subequal to paraglossa; dorsal surface with one longitudinal row of 7 short spine-like setae on apical half, near inner margin, 1 thin and long spine-like setae on apex one longitudinal row of 6 robust spine-like setae on apical half near to outer margin; ventral surface covered by long, thin, and simple setae. Paraglossa curved inward; dorsal surface with one longitudinal row of 13 long spine-like setae on apical half on outer margin and one longitudinal row of 4 robust and long spine-like setae on apical half near inner margin; ventral surface with one longitudinal row of 4 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 robust and triangular apically, laterally directed; ventral surface of distomedial projection with tuft thin, long, and simple setae; segment III triangular, with length subequal to width, with slightly detached apex, covered by thin, long and simple setae on outer margin, dorsally with row of 6 to 7 robust spine-like setae in different sizes near to inner margin, ventrally with row of 6 to 8 robust spine-like setae in different sizes near inner margin. Thorax. Legs ( Figs. 14A–C ). Femur. Anterior surface with one row of 6 spine-like setae in different sizes on basal half near ventral margin; posterior surface with one row of 7 spine-like setae in different sizes on basal half near ventral margin; posterior surface with one row of 5 minute blunt setae on 2/3 basal near dorsal margin. Tibia. Dorsal margin bare; ventral margin with one row of 12 to 14 short spine-like setae. Patella-tibial suture present, restricted to ventral margin. Tarsus. Dorsal margin bare; ventral margin with one row of 11 to 13 short spine-like setae; tarsus I 1.2× longer than tibia; tarsi II and III length subequal to tibia. Tarsal claw. claw I 0.6× length of tarsus I; claws II and III 0.8× length of tarsi; two row of minute denticles almost imperceptible on basal half. Slide without terga, sterna and gill. Abdomen. Paraproct ( Fig. 14D ). Twelve marginal spines; posterolateral extension with triangular pointed spines. Cerci ( Fig. 14E ). Lateral short spines on all segments. Paracercus ( Fig. 14F ). Without spines.

Imago: Unknown.

Etymology. The specific name is a tribute to Dr. Daniela Mulari, first woman to head the Department of Clinical Sciences at the Liverpool School of Tropical Medicine in the United Kingdom, coordinating the centers that study the effectiveness of the vaccine against COVID-19 developed by the University of Oxford and the pharmaceutical company AstraZeneca. Noun in the genitive case.

Diagnosis. Mature nymph. 1) Distal medial margin of labrum slightly convex ( Figs. 13A ); 2) dorsal surface of labrum with 4 bifid and elongated medial spine-like setae near distal margin ( Figs. 13A–B ); 3) lingua subquadrangular, apical tuft of setae present, length subequal to superlingua ( Fig. 13E ); 4) maxillary palp long, 1.5× length of galea-lacinia; segment II without apical constriction ( Fig. 13F ); 5) segment II of labial palp with triangular distomedial projection; segment III triangular, with slightly detached apex ( Fig. 13G ); 6) glossa robust, from apex to base, subtriangular at apex, length subequal to paraglossa ( Fig. 13G ); 7) posterior surface of foreleg with one row of 5 minute blunt setae on 2/3 basal near dorsal margin of femur; tarsus I 1.2× longer than tibia ( Fig. 14A ); 8) claw I 0.6× length of tarsus, claw II and III 0.8 × length of tarsus; two row of minute denticles almost imperceptible on basal half of the all claws ( Fig. 14A ); 9) paraproct with several spines, posterolateral extension with triangular pointed spines ( Fig. 14D ).

Figures

FIGURE 13. Apobaetis danielae sp. nov. Holotype, mouthparts of nymph. A. labrum (left d.v., right v.v). B. detail of medial bifid spine-like setae near to distal margin on dorsal surface of labrum. C. left mandible. D. right mandible. E. hypopharynx. F. maxilla. G. labium (left d.v., right v.v.). H. detail of setae on apex of glossa (d.v.).

FIGURE 14. Apobaetis danielae sp. nov. Holotype, thorax and abdomen of nymph. A. foreleg (femur on anterior surface), setae on posterior surface dotted. B. detail of setae on posterior surface of forefemur. C. detail of two row of denticles on tarsal claw. D. paraproct. E. cercus. F. paracercus.