Nigrobaetis Kazlauskas

Kluge, Nikita, Sivaruban, T., Srinivasan, Pandiarajan, Barathy, S. & Isack, Rajasekaran, 2024, Redescriptions of Indian species of Nigrobaetis Kazlauskas (in Novikova & Kluge) 1987 (Ephemeroptera, Baetidae), Zootaxa 5418 (5), pp. 528-550 : 529

Genus Nigrobaetis Kazlauskas (in Novikova & Kluge) 1987

( Figs 1–89 )

Genus Nigrobaetis: Kazlauskas 1972: 338 (imago, larva) (unavailable name, since type species was not reported in direct form).

Subgenus Nigrobaetis Kazlauskas : Novikova & Kluge 1987: 13.

Nigrobaetis /fg1: Kluge & Novikova 2014: 227.

Type species: Ephemera nigra Linnaeus 1761 .

Comments. The genus Nigrobaetis is divided into three subgenera, Nigrobaetis s. str. (= Diphetor Waltz & McCafferty 1987 ), Takobia Novikova & Kluge 1987 (= Alainites Waltz & McCafferty in Waltz, McCafferty & Thomas 1994, = Acerbaetis Kang & Yang in Kang, Chang & Yang 1994) and Margobaetis Kang & Yang in Kang, Chang & Yang 1994 ( Kluge 2022). In India, the genus Nigrobaetis is represented by two species belonging to the subgenus Margobaetis .

Figures

FIGURES 1–12. Nigrobaetis (Margobaetis) minutus, larvae. 1–6, specimen from Madurai; 7–8, specimen from Erumeli; 9–12, specimen from Pinrang (Sulawesi). 1, exuviae of head; 2–4, exuviae of fore, middle and hind legs; 5, 7, 11, exuviae of abdomen; 6, 8, 12, exuviae of pronotum and mesonotum; 9, 10, fore and hind legs.

FIGURES 13–18. Nigrobaetis (Margobaetis) minutus, larval mouthparts. 13, labrum; 14–15, left and right mandibles; 16, maxilla; 17, paraglossa (focus on dorsal side); 18, labium (focus on ventral side).

FIGURES 19–22. Nigrobaetis (Margobaetis) minutus, exuviae of larval tibia and tarsus. 19–21, fore, middle and hind legs; 22, hind leg of another specimen.

FIGURES 23–25. Nigrobaetis (Margobaetis) minutus, exuviae of larval abdomen. 23, sterna VIII–IX of female; 24, sterna VIII–X of male; 25, fragment of cercus.

FIGURES 26–32. Nigrobaetis (Margobaetis) minutus. 26, male imago; 27, subimaginal exuviae of meso- and metapleura; 28, subimaginal exuviae of mesonotum; 29–30, fore and middle legs of male imago; 31–32, female imago.

FIGURES 33–34. Nigrobaetis (Margobaetis) minutus, male subimago. 33, 3rd–5th tarsomeres of fore leg, 34, apex of tibia and tarsus of hind leg.

FIGURES 35–38. Nigrobaetis (Margobaetis) minutus, genitalia of male imago. 35, ventral view; 36, view with focus on gonovectes and penial bridge; 37, ventral view with focus on sterno-styligeral muscle and median sclerite; 38, lateral view. Abbreviation: m.s, median sterno-styligeral muscle.

FIGURES 39–43. Nigrobaetis (Margobaetis) minutus, eggs.

FIGURES 44–52. Nigrobaetis (Margobaetis) klugei, larval exuviae. 44, head; 45, prosternum with fore leg; 46, mesosternum, metasternum and metanotum with hind protoptera, middle and hind legs; 47, 49, 51, abdomen; 48, 50, 52, half of pronotum and mesonotum.

FIGURES 53–54. Nigrobaetis (Margobaetis) klugei, larval exuviae. 53, labrum; 54, labium.

FIGURES 55–57. Nigrobaetis (Margobaetis) klugei, larval exuviae of tibia and tarsus. 55, fore leg; 56, middle leg; 57, hind leg.

FIGURES 58–68. Nigrobaetis (Margobaetis) klugei, larval exuviae. 58–60, fore, middle and hind legs; 61–63, paraprocts; 64–68, fragments of abdomen with tergalii I–VII.

FIGURES 69–71. Nigrobaetis (Margobaetis) klugei, larval exuviae of caudalii (dorsal view). 69, caudalii; 70, fragment of paracercus; 71, fragment of right cercus.

FIGURES 72–81. Nigrobaetis (Margobaetis) klugei. 72, subimaginal exuviae of meso- and metapleura; 73, subimaginal exuviae of mesonotum; 74, male imago; 75, hind wing of male imago; 76–77, hind wings of female imago (one and the same specimen); 78–79, female imago; 80, genitalia of male imago; 81, subimaginal exuviae of hind leg.

FIGURES 82–85. Nigrobaetis (Margobaetis) klugei, genitalia of male imago, ventral view. 82, with gonovectes retracted; 83–85, with gonovectes protracted (84, with focus on surface and sterno-styligeral muscle; 85, with focus on gonovectes and intersegmental sternal muscles). Abbreviations: m.IX-X, paired intersegmental muscles going to paraprocts base; m.s, median sterno-styligeral muscle.

FIGURES 86–89. Nigrobaetis (Margobaetis) klugei, eggs.