Apobaetis biancae, Cruz & Boldrini & Hamada, 2020

Cruz, Paulo Vilela, Boldrini, Rafael & Hamada, Neusa, 2020, Redescription of Apobaetis lakota McCafferty, 2000 (Ephemeroptera: Baetidae) and description of two new species from Brazil, Zootaxa 4885 (2), pp. 249-258 : 252-254

publication ID	https://doi.org/ 10.11646/zootaxa.4885.2.6
publication LSID	lsid:zoobank.org:pub:1867609A-0C7B-4060-B33E-B4594D332B91
DOI	https://doi.org/10.5281/zenodo.4327927
persistent identifier	https://treatment.plazi.org/id/2B0C87B5-FF90-9E63-0BEE-FC5F9F9705C8
treatment provided by	Plazi
scientific name	Apobaetis biancae
status	sp. nov.

Treatment

Apobaetis biancae sp. nov. Boldrini

( Figs 2 View FIGURE 2 A–2J, 4A, 4B)

Apobaetis sp. nov. A in Boldrini & Cruz 2014: 4

Diagnosis. Larva. 1) labrum rectangular, distal margin without shallow medial emargination, medial area of distal margin with four robust pointed setae ( Fig. 2A View FIGURE 2 ); 2) maxillary palp long, more than 2.5× the length of galea-lacinia, segment I slightly longer than galea-lacinia ( Fig. 2D View FIGURE 2 ); 3) lingua subquadrate with one medial lobe ( Fig. 2E View FIGURE 2 ); 4) glossa distally rounded; 5) inner projection of labial palp segment II rounded, segment III triangular ( Fig. 2F View FIGURE 2 ); 6) tarsal claws 1.4× the length of tarsus, without row of denticles ( Fig. 2G View FIGURE 2 ); 7) posterior margin of tergum IV with triangular spines (longer than wide) ( Fig. 2H View FIGURE 2 ).

Description. Larva. Body: 4.0– 4.2 mm; cercus approximately 1.5 mm. Body whitish ( Fig. 4 View FIGURE 4 A–B). Head. Antenna with minute spines on the apex of each segment. Frontal keel absent. Labrum ( Fig. 2A View FIGURE 2 ): rectangular; distal margin without shallow medial emargination and medial lobe; distolateral area and distal margin with robust setae; medial area of distal margin with four robust setae on dorsal surface; ventral surface with one row of thin setae on medial area near distal margin. Left mandible ( Fig. 2B View FIGURE 2 ): outer and inner sets of incisors with 5 and 3 denticles, respectively; prostheca robust, bifid at apex, inner margin frayed at middle; margin between prostheca and mola concave, with frayed lobe close to subtriangular process; tuft of robust setae at base of mola present; subtriangular process wide; denticles of mola not constricted; lateral margin convex. Right mandible ( Fig. 2C View FIGURE 2 ): outer and inner sets of incisors with 3 denticles each; prostheca slender, bifurcated at apex; margin between prostheca and mola concave; tuft of setae at base of mola absent; denticles of mola constricted; lateral margin convex. Maxilla ( Fig. 2D View FIGURE 2 ): maxillary palp long, more than 2.5× the length of galea-lacinia; segment I slightly longer than galea-lacinia, segment II without distal constriction; maxillary palp with scarce, thin, simple setae scattered over the surface. Hypopharynx ( Fig. 2E View FIGURE 2 ): lingua subquadrate and longer than superlingua, with one medial lobe and without distal tuft of setae; superlingua not expanded, with short, thin, simple setae scattered over distal margin. Labium ( Fig 2F View FIGURE 2 ): glossa narrowing slightly distally with apex rounded, longer than paraglossa; dorsal surface with one arc of setae on distal half, from inner to outer margin; ventral surface covered with small robust setae (not completely illustrated). Paraglossa curved inward; dorsal surface with three robust setae on apex and with one longitudinal row of five robust setae near inner margin; outer margin with one row of 14 robust setae; ventral surface with one longitudinal row of five robust setae in the middle. Labial palp with segment I shorter than the length of segments II and III combined; inner projection of labial palp of segment II rounded and laterally directed, outer margin and projection covered with thin, long, simple setae; ventral surface of segment II with of thin, long setae near the outer margin; segment III triangular, covered with thin, long, simple setae on outer margin, dorsal surface with one row of nine robust setae, outer margin concave. Thorax. Foreleg ( Fig. 2G View FIGURE 2 ). Femur: with one row of 14 short robust setae on dorsal margin. Tibia: ventrally with one row of four short robust setae. Patella-tibial suture from dorsal to ventral margin. Tarsus: ventrally with one row of 12 short robust setae. Tarsal claws 1.4× the length of tarsus, row of denticles absent. Abdomen. Terga II and VII with a reddish medial mark, tergum V with a reddish lateral mark, terga IX and X reddish. Tergal surface covered by scale-like triangular spines ( Fig. 2H View FIGURE 2 ); posterior margin with triangular spines (longer than wide) ( Fig. 2H View FIGURE 2 ). Gill VI ( Fig. 2I View FIGURE 2 ) oblong. Paraproct ( Fig. 2J View FIGURE 2 ) with four marginal spines, posterolateral extension without spines. Cerci and paracercus with lateral spines on all segments.

Comments. This species is found with low abundance on the sand bottom of a small stream.

Etymology. After Bianca M. P. O. Boldrini, friend, wife of second author (R.B.), a great teacher and a fellow scientist, who gives him all the support needed.

Material examined. Holotype, one larva in alcohol, Brazil, Rondônia, Colorado do Oeste, Rio Cabixi , S 13°15’31.8” / W060°20’04.8”, 06.ix.2012, Boldrini, R., Fernandes, A.S., Hamada, N., Nascimento, J.M.C. cols, INPA GoogleMaps . Paratypes, same data as holotype, one larva in alcohol and two mounted on slides, UFRR GoogleMaps .