Teloganodes jacobusi 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 : 20-21

Teloganodes jacobusi Sartori sp. nov.

( Figs.20, 21 , 27 , 34 , 42 , 47 , 61, 62 , 87–90, 126–128)

Material examined. Holotype: 1 male nymph, Sri Lanka, Nuwara Eliya district , Nuwara Eliya, stream below Lover’s Leap, 2.IV.1978, M. Hubbard [ USNM].

Paratypes: 19 nymphs, same data as holotype [ MZL, of which 1 partially mounted on slide preparation]; 21 nymphs, same data as holotype, but 19.III.1978 [ FAMU], 85 nymphs, Nuwara Eliya , small Lover’s Leap stream, 1.IV.1978, M. Hubbard [66 in FAMU, 2 in AMG, 17 in MZL of which 1 partially mounted on slide preparation]; 25 nymphs, Nuwara Eliya district , Hakgala – Kande Ella, 3.IV.1978, M. Hubbard [ FAMU], 41 nymphs, Kandy district , Haloya , Khone Palama , 17.III.1978, M. Hubbard [ MZL of which 1 partially mounted on slide preparation], 2 nymphs, Ratnapura District , Belihuloya , Belihul Oya , 9.IV.1978, M. Hubbard [ FAMU], 1 nymph, Maskeliya Region , Maskeliya Riv. at base of Adam's Peak, about 1 km above Maskeliya impoundment, 1800 m, 1.XII.1970, F. Starmuehlner [ FAMU] .

Description. Nymph

Body length up to 6.0 mm and 5.0 mm, without cerci, in female and male nymphs respectively; cerci length subequal to body length.

General colouration variable dorsally, ranging from middle to dark brown; young specimens generally paler; legs light brown; with medium brown maculae on dorsal face, uniformly cream-coloured ventrally ( Figs. 126–127 ).

Antennae 0.65–0.80 times head width, flagellum with 13–15 segments. Dorsal part of male eyes orange. Labrum ( Fig. 20 ) compact, ca. 2 times wider than long, with smooth anterior emargination; dorsal surface covered medially by numerous, mainly long feathered setae, together with some long simple setae. Mandibles slender with one, sometimes 2, thin setae in middle of outer margin; right mandible ( Fig. 27 ) with outer incisor compact, spoon shape; inner incisor with 2 teeth; prostheca reduced, comprised of a cluster of thin setae; a row of long, thin setae below mola and a cluster of short setae above mola; left mandible ( Fig. 34 ) with outer incisor compact and rounded; inner incisor with 2 teeth inserted transversely, one smaller and pointed, the other large and rounded, prostheca small with a cluster of small setae; no setae below mola. Maxillae slender, with a well developed canine, 2 indented dentisetae and 3 long inner setae apically and a bunch of long simple setae at crown; inner margin at base of lacinia with one long feathered seta dorsally and a row of 4–5 thin feathered setae ventrally ( Fig. 42 ); maxillary palp reduced to a single simple seta. Hypopharynx ( Fig. 47 ) with superlinguae angular laterally, a row of long feathered setae at apex. Submentum moderately developed laterally; glossae and paraglossae partially fused; paraglossae larger than glossae; labial palp 3-segmented, segments 1 and 2 subequal in length, segment 2 slightly wider distally, segment 3 small and rounded, ca. 1.5 times as long as wide at base ( Fig. 50 ).

Prothorax with 6 rounded tubercles on dorsal surface; mesothorax embossed, without distinct tubercles. Forefemur ( Fig. 61 ) moderately dilated, ca. 2 times longer than wide; outer margin covered by stout and long setae, meeting a transverse row of stout, relatively short setae ( Fig. 62 ) across dorsal face; a submarginal row of stout and short setae, the same scattered over dorsal face; inner margin with a long row of long and thin setae almost reaching articulation with tibia. Middle and hind femora similar, slightly more slender, ca. 2.2– 2.3 times longer than wide; dorsal and inner margins with a row of long and stout setae, without transverse row. 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 4–6 blunt teeth medially and 2 pointed teeth subapically; apex of claw with two rows of small setae laterally.

Abdominal terga with a well developed median tubercle on segments I–VIII, more developed on segment IX and absent on segment X ( Fig. 128 ). Posterolateral projections weakly developed on segments II–V, well marked on segments VI–IX ( Fig. 127 ). Lateral margins of terga with both thin and stout short setae. Gills (Figs. 87–90) on abdominal segments II–V. Gill II with dorsal lamella operculate, oval and with entire margin; gills III–IV with dorsal lamella incised medially; gill V entire; ventral lobe flabellate, well developed and purple on gills II–IV.

Cerci with stout setae shorter than length of corresponding segment.

Winged stages unknown

Diagnosis. T. jacobusi is easily separated from T. insignis , T. tuberculatus and T. kodai by the absence of abdominal gills on segment VI, by the dissimilar teeth of the inner incisor of the left mandible and by the forefemora dilated and with a transverse row of setae.

Etymology. This species is named after Dr Luke M. Jacobus (Columbus, Indiana, USA) to acknowledge his major contributions on Oriental Ephemerelloidea and for his constant support during this research.

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 26–32. Right mandible of Oriental Teloganodidae. Fig. 26: Teloganodes tuberculatus; Fig. 27: T. jacobusi; Fig. 28: Dudgeodes hutanis; Fig. 29: D. pescadori (shape of the new mandible in dotted line); Fig. 30: D. celebensis; Fig. 31: D. ulmeri; Fig. 32: Derlethina eloisae. All same scale.

FIGURES 33–39. Left mandible of Oriental Teloganodidae. Fig. 33: Teloganodes tuberculatus; Fig. 34: T. jacobusi; Fig. 35: Dudgeodes hutanis; Fig. 36: D. pescadori (shape of the new mandible in dotted line); Fig. 37: D. celebensis; Fig. 38: D. ulmeri; Fig. 39: Derlethina eloisae. All same scale.

FIGURES 40–46. Maxillae (40, 41) and detail of the setae on the apico-ventral part (42–46) of Oriental Teloganodidae. Fig. 40: Teloganodes tuberculatus; Fig. 41: Dudgeodes hutanis; Fig. 42: T. jacobusi; Fig. 43: T. kodai; Fig. 44: D. pescadori; Fig. 45: D. ulmeri; Fig. 46: Derlethina eloisae.

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 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.