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.