Teloganodes hubbardi Sartori, 2008

Sartori, Michel, Peters, Janice G. & Hubbard, Michael D., 2008, A revision of Oriental Teloganodidae (Insecta, Ephemeroptera, Ephemerelloidea), Zootaxa 1957 (1), pp. 1-51 : 21-23

Teloganodes hubbardi Sartori sp. nov.

( Figs. 18,19 , 48, 52 , 63, 64 , 77 , 98–101 , 129–131 )

Material examined. Holotype: 1 male nymph, Sri Lanka, Kandy district , Haloya, Khone Palama, 17.III.1978, M. Hubbard [ USNM].

Paratypes: 25 nymphs, same data as holotype [21 in FAMU, 4 in MZL of which 1 partially mounted on slide preparation]; 8 nymphs, Kandy district , Haloya , Hasalaka , Gorulupatha Ella , 15.III.1978, M. Hubbard [5 in FAMU, 3 in MZL of which 1 partially mounted on slide preparation]; 4 nymphs, Galle District , stream crossing road above Kanneliya, 7.III.1978; 4 nymphs, Galle District ., Kanneliya, stream above hydrological station, 8.III.1978, 4 nymphs, Kalutara District, Wayangale, 4.III.1978; 1 nymph, Kegalle District, Kitulgala Rest House, 20.II.1978, all M. Hubard [ FAMU] .

Description. Nymph

Body length up to 4.5 mm and 4.0 mm, without cerci, in female and male nymphs respectively; cerci length up to 4.0 mm and 3.0 mm in female and male nymphs respectively.

General colouration dark brown dorsally, except head and abdominal segment X yellowish to whitish, legs whitish with 4 dark brown maculae on dorsal face, maculae sometimes merging; ventrally, uniformly creamy ( Figs. 129–130 ).

Antennae 0.9–1.1 times head width, flagellum with 12–14 articles, first segment more than 2 times length of second. Dorsal part of male eyes orange.

Labrum with same ornamentation as in T. jacobusi , but anteromedian emargination more pronounced ( Fig. 18 ), scattered setae on dorsal face less numerous and less feathered ( Fig. 19 ). Mandibles and maxillae similar to those of T. jacobusi . Hypopharynx ( Fig. 48 ) with superlinguae rounded laterally, a row of feathered and long setae at apex; lingua relatively narrow. Labium similar to that of T. jacobusi , except segment 2 of palp not enlarged distally ( Fig. 52 ).

Pro- and mesothorax as in T. jacobusi . Forefemur ( Fig. 63 ) greatly dilated, ca. 1.3–1.4 times longer than wide; outer margin covered by stout and long setae, a transverse row of stout and long setae across dorsal face ( Fig. 64 ); no other setae on dorsal face; inner margin with a long row of long and thin setae almost reaching articulation with tibia. Middle femur more slender, ca. 1.6–1.8 times longer than wide; dorsal and inner margins with a row of long and stout setae. Hind femur even more slender, ca. 2 times longer than wide, with the same ornamentation as middle femur. Tibia with a row of long and stout setae on inner margin, and a row of long and thin setae on outer margin. Tarsal claw hooked, bearing 4 acute medial teeth, and 2 pointed and extremely developed teeth subapically; apex of claw with two rows of thin and long setae laterally ( Fig. 77 ).

Abdominal terga with a well developed median tubercle on segments I–V, more developed on segments VI–IX and absent on segment X ( Fig. 131 ). Posterolateral projections weakly developed on segments II–III, more marked on segments IV–V, and extremely developed on segments VI–IX ( Fig. 130 ). Lateral margins of terga with long and thin setae. Gills on abdominal segments II–V, the same than those of T. jacobusi .

Cerci with stout setae shorter than length of corresponding segment.

Winged stages unknown.

Egg. Pear-shaped, ca. 185 µm / 100 µm ( Fig. 98 ). Chorion lacking attachment structures, and constituted by polygonal plates separated by a ridge of ca. 2–3 µm. One micropyle visible situated near polar cap and directed toward opposite pole ( Fig. 100 ). Triangular chorionic structures arising from chorion to “set” the polar cap ( Figs. 99–100 ). Polar cap constituted by two kind of epithema; a multitude of short, non-coiled threads and larger non-coiled threads compacted into a droplet structure ( Fig. 101 ), those arranged regularly around polar cap ( Fig. 99 ).

Diagnosis. T. hubbardi is most similar to T. jacobusi from which it can be easily told by the shape of the posterolateral projections which are much more developed on abdominal segments VI–IX, the anteromedian emargination of the labrum more incised, superlinguae of the hypopharynx more rounded, and forefemora more dilated without submarginal stout setae.

Etymology. This species is named after our colleague and friend Prof. Michael D. Hubbard (Florida A & M University, USA) who collected most of the Ceylon material used in this study.

Figures

FIGURES 16–25. Labrum (16, 18, 20, 22, 24), with details of the dorsal setae (17, 19, 21, 23, 25), of Oriental Teloganodidae. Insertion of the setae indicated by dots on the labrum. Figs. 16–17: Teloganodes tuberculatus; Figs. 18–19: T. hubbardi; Figs. 20–21: T. jacobusi; Figs. 22–23: Dudgeodes hutanis; Figs. 24–25: Derlethina eloisae. All labra at same scale and all setae at same scale, two times enlarged compared to the labra.

FIGURES 47–58. Hypopharynx (47–49), labium (50) and labial palp (51–58) of Oriental Teloganodidae. Fig. 47: Teloganodes jacobusi (setae on the left superlingua not drawn); Fig. 48: T. hubbardi (half right); Fig. 49: Dudgeodes hutanis (half left); Fig. 50: T. jacobusi; Fig. 51: T. tuberculatus; Fig. 52: T. hubbardi; Fig. 53: D. hutanis; Fig. 54: D. stephani; Fig. 55: D. celebensis; Fig. 56: D. ulmeri; Fig. 57: D. pescadori; Fig. 58; Derlethina eloisae. Hypopharynx at same scale; labium and labial palps at same scale.

FIGURES 59–64. Forefemur (59, 60, 61, 63) and setae on the transverse row (62, 64) of Teloganodes spp. Insertion of the setae on the margins indicated by dots; only some setae drawn. Fig. 59: T. tuberculatus; Fig. 60: T. kodai; Figs. 61– 62: T. jacobusi; Figs. 63–64: T. hubbardi. Femora at same scale; setae at same scale.

FIGURES 77–81. Tarsal claw of Oriental Teloganodidae. Fig. 77: Teloganodes hubbardi; Fig. 78: Dudgeodes hutanis; Fig. 79: D. stephani; Fig. 80: D. celebensis; Fig. 81: Derlethina eloisae. All claws same scale.

FIGURES 98–102. Egg structure of Teloganodes hubbardi (98–101, SEM pictures) and T. tristis (102, light microscope). Fig. 98: Shape of the egg; Fig. 99: Detail of the polar cap; Fig. 100: Micropyle area and crown of sets; Fig. 101: Detail of the uncoiled tread of the epithema; Fig. 102: Partial view of polar caps where crown and uncoiled threads are visible.

FIGURES 126–131. Holotypes of Teloganodes spp. in dorsal view (126, 129), abdomen in ventral view (127, 130) and in lateral view (128, 131). Figs. 126–128: T. jacobusi; Figs. 129–131: T. hubbardi.