Teloganodes tuberculatus 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 : 12-15

Teloganodes tuberculatus Sartori sp. nov.

( Figs. 16, 17 , 26 , 33 , 40 , 51 , 59 , 82–86, 120–122)

Material examined. Holotype: 1 nymph (not mature), Sri Lanka, Kandy District , Haloya, Khone Palama, 17.III.1978, M. Hubbard [ USNM].

Paratypes: 3 nymphs, same data as holotype [2 in FAMU, 1 partially mounted on slide preparation in MZL] .

Description. Nymph

Body length at least 4.5 mm without cerci. Cerci length ca. 1.6 times body length.

General colouration of head, thorax and abdomen medium brown dorsally; sterna and legs uniformly yellowish ( Figs. 120–121 ).

Outer margin of head fringed with a row of setae from behind eyes to labrum insertion ( Fig. 120 ). Antennae short, 0.7 times head width, flagellum with 10–11 segments. Labrum compact, ca. 2 times wider than long, with smooth anterior emargination ( Fig. 16 ); dorsal face covered medially by 2–4 rows of long feathered setae ( Fig. 17 ); anterior margin with a row of small thin setae. Mandibles ( Figs. 26 , 33 ) slender with 2 thin setae in middle of outer margin; right mandible ( Fig. 26 ) with outer incisor with inner tooth; inner incisor with 2 teeth; prostheca reduced to a cluster of thin setae; a row of long, thin setae below mola; left mandible ( Fig. 33 ) with long outer incisor rounded; inner tooth close to inner incisor; inner incisor with 3 teeth, prostheca well developed with cluster of small setae. Maxillae ( Fig. 40 ) slender, with a well developed canine and 2 dentisetae; 3 long inner setae apically and a cluster of long, simple setae at crown; inner margin at base of lacinia with one long feathered seta dorsally and row of 3–4 short feathered setae ventrally; maxillary palp reduced to a simple seta. Submentum moderately developed laterally; glossae and paraglossae partially fused; glossae rhomboid and paraglossae slightly falciform (similar to Fig. 50 ); labial palp three-segmented, segment 1 subequal in length to segments 2 and 3 combined ( Fig. 51 ).

Prothorax with 6 rounded tubercles on dorsal face; mesothorax with 5. All legs similar in shape and ornamentation. Femur ( Fig. 59 ) moderately slender, ca. 2.2 times longer than wide; outer margin covered by thin and long setae together with 6–7 sharp, thick and pointed setae; submarginal row of short and blunt setae almost absent in foreleg, but distinct on middle and hind femora; inner margin with a row of long and thin setae, the row continuing on dorsal face, close to articulation with trochanter. Tibia with a row of long and thin setae, starting on proximal part close to outer margin and ending in distal part close to inner margin. Tarsal claw hooked, bearing 3 blunt teeth medially, and 2 pointed teeth subapically; apex of claw with two rows of small setae laterally.

All abdominal terga with well developed median tubercle, slightly increasing in size posteriorly ( Fig. 122 ). No posterolateral projections on segments II–VII, slightly marked on segments VIII and IX ( Fig. 121 ). Lateral margins of terga with short and thin setae. Gills (Figs. 82–86) on abdominal segments II–VI. Gill II with dorsal lamella operculate and covering others, oval with margin entire; gills III–V with dorsal lamella incised medially; gill VI with dorsal lamella reduced and entire; ventral lobe flabellate, well developed and purple on gills II–V. Cerci with a whorl of spines every 2–3 segments; spines shorter than length of corresponding segment.

Winged stages unknown

Diagnosis. The nymph of T. tuberculatus can be easily distinguished from that of T. insignis by the shape of the labrum, the number of setae on the dorsal margin of the mandibles and the shape and ornamentation of the femora.

Etymology. The epithet “tuberculatus” refers to the well developed tubercles found on the thorax and abdomen of this species.

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 120–125. Holotypes of Teloganodes spp. in dorsal view (120, 123), abdomen in ventral view (121, 124) and in lateral view (122, 125). Figs. 120–122: T. tuberculatus; Figs. 123–125: T. kodai.