Margobaetis Kang & Yang 1994

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

Subgenus Margobaetis Kang & Yang 1994

( Figs 1–89 )

Group gracilis : Novikova & Kluge 1994: 634 (egg, larva).

Subgenus Margobaetis Kang & Yang (in Kang, Chang & Yang) 1994: 11 (partim).

Type species: Baetis (Margobaetis) mundus Chang & Yang (in Kang & Chang & Yang) 1994.

Diagnosis. Egg more or less asymmetric: in typical case one side bluntly cone-like pointed, with surface mostly smooth; opposite side hemispheric or hemi-ellipsoid, with regularly arranged papillae and/or other relief ( Figs 39–43 , 86–89 ). Paraglossa narrower than in other Nigrobaetis , with apical setae arranged mostly in 2 longitudinal rows ( Figs 17–18 , 54 ; Müller-Liebenau 1969: Abb. 140e; Kaltenbach & Gattolliat 2023: figs 4b, 12b, 18b, 24b–c, 31b–c, 37d).

Composition. Europe: Nigrobaetis (Margobaetis) gracilis ( Bogoescu & Tabacaru 1957) .

Jordan: probably N. (M.) vuatazi Gattolliat & Sartori in Gattolliat et al. 2012 (egg structure unknown).

Arabia: N. (M.) arabiensis Gattolliat & Sartori 2008 .

Algeria: probably N. (M.) numidicus ( Soldan & Thomas 1983) (egg structure unknown).

Afrotropical Region: probably N. (M.) bethuneae Lugo-Ortiz & de Moor 2000 (egg structure unknown). In subsequent publications, some other Afrotropical species will be described.

Siberia and Far East: N. (M.) bacillus ( Kluge 1983) .

Continental China: probably N. (M.) trialbus Li et al. 2023 (egg structure unknown).

Taiwan: N. (M.) tatuensis (Müller-Liebenau 1985) (= « Baetis taiwanensis »: Kang et al. 1994), N. (M.) mundus (Chang & Yang in Kang et al. 1994). Probably also N. (M.) facetus (Chang & Yang in Kang et al. 1994), N. (M.) terminus (Chang & Yang in Kang et al. 1994) (egg structure unknown).

Oriental Region: N. (M.) minutus ( Müller-Liebenau 1984) (= N. paramakalyani Kubendran & Balasubramanian in Kubendran et al. 2015 syn. n.; = N. sumbensis Kaltenbach & Gattolliat 2023 syn. n.), N. (M.) klugei Sivaruban et al. 2022 . Probably also species with unknown egg structure— N. (M.) mirabilis ( Müller-Liebenau 1984) , N. (M.) gombaki ( Müller-Liebenau 1984) , N. (M.) plures Kaltenbach & Gattolliat 2023 , N. (M.) palawus Kaltenbach & Gattolliat 2023 , N. (M.) suma Kaltenbach & Gattolliat 2023 , N. (M.) borneus Kaltenbach & Gattolliat 2023 , N. (M.) kaliman Kaltenbach & Gattolliat 2023 . Described and figured eggs of N. plures , N. suma and N. kaliman ( Kaltenbach & Gattolliat 2023: figs 7, 27, 40) are immature, have no definite shape and have no chorion structure. In subsequent publications, some other Oriental species will be described.

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.