Derlethina Sartori, 2008

Kluge, Nikita, Srinivasan, Pandiarajan, Sivaruban, T., Barathy, S. & Isack, Rajasekaran, 2023, Indian species of Teloganodes Eaton 1882 (including subgenera Dudgeodes Sartori 2008 and Derlethina Sartori 2008) (Ephemeroptera, Teloganodidae), Zootaxa 5244 (6), pp. 553-587 : 580

Subgenus Derlethina Sartori in Sartori et al. 2008

( Figs 137–161 )

Genus Derlethina Sartori in Sartori, Peters & Hubbard 2008: 44 .

Subgenus Derlethina: Kluge 2023 .

Type species: Derlethina eloisae Sartori in Sartori, Peters & Hubbard 2008.

Diagnosis. Tergalii II–IV (3 pairs) present; tergalius III with ventral lobe and with cleft on dorsal lobe; tergalius IV without ventral lobe, either with cleft on dorsal lobe ( Fig. 19 ), or without it; tergalii V–VI absent ( Figs 17–19 ). Differs from all other subgenera by loss of tergalii V–VI.

Indian representatives. One species, Teloganodes (Derlethina) tamiraparaniae (Selvakumar et al. in Selvakumar et al. 2014)

Comment. The genus Derlethina , besides the absence of the fifth pair of tergalii, was said to differ from the genera Teloganodes and Dudgeodes by two imaginal characters:

́Hind wing minute with costal process acute and located almost at apex of wing; a single simple longitudinal vein» ( Sartori et al. 2008: 44, fig. 15). Actually hind protoptera of T. (D.) tamiraparaniae demonstrate the shape and venation usual for other taxa of Teloganodes , with costal process located near middle and with more than one vein ( Figs 155–156 ). The same is true for the type species, T. (Derlethina) eloisae ( Kluge 2023: fig. 3).

́The absence of crossvein in the pterostigmatic area of the forewing» ( Sartori et al. 2008: 44, fig. 14). Actually in T. (D.) tamiraparaniae crossveins in pterostigmatic area are present both on imaginal wings ( Fig. 152 ) and on larval protoptera ( Figs 153–154 ). The same is true for protoptera of the type species, T. (Derlethina) eloisae ( Kluge 2023: fig. 2).

Figures

FIGURES 137–140. Teloganodes (Derlethina) tamiraparaniae, larval exuviae. 137, end of abdomen, ventral view; 138–140, fore, middle and hind legs.

FIGURES 141–144. Teloganodes (Derlethina) tamiraparaniae, larval exuviae. 141, abdominal sterna and terga; 142, posterior margin of tergum VI; 143–144, pronotum and mesonotum.

FIGURES 145–150. Teloganodes (Derlethina) tamiraparaniae. 145, head and thorax of male imago; 146, abdominal terga and sterna of male imago; 147–148, fore and middle legs of male imago; 149–150, subimaginal exuviae of fore and middle legs of male.

FIGURES 151–156. Teloganodes (Derlethina) tamiraparaniae. 151–152, fore wing of male imago, in falling and transmitted light; 153–154, larval fore protopteron with well-visible veins in pterostigma; 155–156, hind protoptera of two individuals.

FIGURES 157–161. Teloganodes (Derlethina) tamiraparaniae. 157–158, exuviae of subimaginal mesonotum (in dry condition and in Canadian balsam); 159, exuviae of male subimaginal genitalia; 160, genitalia of male imago, ventral view; 161, penis in dorsal view.Abbreviations:acz, achromozone; cz.a, anterior chromozone; cz.l-p, latero-posterior chromozone; cz.s, chromozonal suture; gp, gonopore; LPs, lateroparapsidal suture; MPs, medioparapsidal suture; MS, medioscutum; SMS, submedioscutum.

FIGURES 1–19. Tergalii of Teloganodes with ventral lobe turned out. 1–6, tergalii II–VI of T. (Teloganodes) velutinus sp. n. (5 and 6, tergalii VI of the same individual); 7–12, tergalii II–VI of T. (T.) dentatus (11 and 12, tergalii VII of different individuals); 13–16, tergalii II–V of T. (Dudgeodes) palnius; 17–19, tergalii II–IV of T. (Derlethina) tamiraparaniae.