Dudgeodes stephani 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 : 35-37

Dudgeodes stephani Sartori sp. nov.

( Figs. 54 , 67, 68, 79, 141–143)

Material examined. Holotype: 1 male nymph, Malaysia, Sabah, Liwagu River, at bridge, Ranau , 335 m., 11– 16.VIII.1972, W.L. & J.G. Peters [ FAMU].

Paratypes: 36 nymphs, same data as holotype [18 in FAMU, 18 in MZL of which 2 partially mounted on slide preparation] ;

Description. Nymph

Body length up to 4.0 mm, without cerci, in female and male nymphs; cerci length slightly longer than body length.

General colouration medium brown dorsally and light brown ventrally; thoracic ganglia tinted with purple; general colouration paler in younger nymphs; legs yellowish, with same 4-stripe pattern as in D. hutanis ( Fig. 141 ).

Antennae 1.2–1.4 times head width, flagellum with 15–18 segments. Dorsal part of male eyes yellowish. Labrum, mandibles and maxillae similar to those of D. hutanis . Hypopharynx with superlinguae broad and rhomboid, a row of long, simple setae at apex. Labium as in D. hutanis ; labial palp three-segmented, articulation between segments 1 and 2 clearly visible, constricted on inner margin; segment 3 more than 3 times as long as wide at base ( Fig. 54 ).

Prothorax with 4 rounded tubercles on dorsal face; mesothorax with none. All legs similar to those of D. hutanis , but forefemora less dilated (Fig. 67) and setae of transverse row sometimes bifid (Fig. 68). Tarsal claw hooked, bearing 3–4 blunt teeth medially and 1 outer pointed subapical tooth, the inner tooth being regressed and almost invisible; apex of claw with two rows of 3–4 thin setae laterally ( Fig. 79 ).

Abdominal terga with a moderately developed median tubercle on segments I–II, more developed on segments III–X ( Fig. 143 ). No posterolateral projections on segments II–III, slightly marked on segments IV–VI and well developed on segments VII–IX ( Fig. 142 ). Gills similar to those of D. hutanis . Cerci with stout setae every 2–3 segments; setae longer than length of corresponding segment.

Winged stages unknown.

Diagnosis. D. stephani can be separated from D. hutanis by the colouration of the eyes in the male nymphs, the shape of the labial palps and the hypopharynx, the tarsal claw with ventral subapical tooth absent, abdominal tubercles and strongly produced posterolateral projections.

Etymology. This species is dedicated in memoriam of Stephane Jaquenoud (1960–2007), friend of the first author and outstanding museographer.

Figures

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 138–143. Holotypes of Dudgeodes spp. in dorsal view (138, 141), abdomen in ventral view (139, 142) and in lateral view (140, 143). Figs. 138–140: D. ulmeri; Figs. 141–143: D. stephani

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.