Dudgeodes celebensis 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 : 43-44

Dudgeodes celebensis Sartori sp. nov.

( Figs. 30 , 37 , 55 , 73, 74, 80, 144–146)

Material examined. Holotype: 1 male nymph, Indonesia, North Sulawesi, vicinity of Manado, Kali Village, site 1, Kali stream at Kali village , above bridge, 01,41412°N; 124,84214°E, 206 m., 8.XII.2004, C. Geraci, M. Dien, F. Mirah, D. Lapasi [ FAMU]

Paratypes: 31 nymphs, same data as holotype [18 in FAMU, 6 in CUAC, 7 in MZL, of which 2 partially mounted on slide preparation]; 1 nymph, Indonesia, North Sulawesi, Minahasa Selantan District, Tenga River at Tenga Village , bridge; 01.16394°N, 124.44313°E, 75 m, 11.XII.2004, C. Geraci, M. Dien, C. Rante [ FAMU] .

Description. Nymph (not full grown)

Body length at least 5 mm, cerci subequal to body length.

General colouration medium to dark brown dorsally and greyish brown ventrally; thoracic ganglia tinted with purple; general colouration sometimes more contrasted in some specimens; legs yellowish to light brown, upper face of femora with variable patterns around the “classic” 4 maculae: in some specimens, these maculae are reduced to tiny lines whereas in others, they are large and well contrasted ( Fig. 144 ).

Antennae 1.0–1.1 times head width, flagellum with 17–18 articles. Dorsal part of male eyes blackish. Labrum and maxillae similar to those of D. pescadori . Mandibles slender with one thin seta in middle of outer margin; right mandible ( Fig. 30 ) with outer incisor composed of one large tooth, slightly indented medially; inner incisor with 2 teeth; prostheca reduced, constituted by a cluster of thin setae; a row of 7–9 long, thin setae below mola and some short setae above mola; left mandible ( Fig. 37 ) with outer incisor consisting of one slightly concave tooth, inner incisor with 2 teeth inserted transversely, one small and pointed, the other large and rounded, prostheca small with a cluster of small setae; no setae below mola. Hypopharynx with superlinguae ovoid and regularly rounded, a row of simple and long setae at apex. Labial palp three-segmented, articulation between segments 1 and 2 clearly visible, constricted on inner margin; segment 3 ca. 2.0 times as long as wide at base ( Fig. 55 ).

Prothorax with 6 flat tubercles on dorsal face; mesothorax with none. Forefemur greatly dilated (Fig. 73), ca. 1.4–1.5 times longer than wide; outer margin covered by stout and long setae, with a transverse row across dorsal face (Fig. 74); 6–7 submarginal short and blunt setae along outer margin; inner margin with a row of long and thin setae reaching ca. 2/3 of femur length; on distal half of inner margin, a row of stout and blunt or pointed spines. Foretibia with one distinct row of long and thin setae on inner margin, and another on outer margin. Middle and hind femora similar, more slender, ca. 1.8–2.0 times longer than wide; dorsal and inner margins with a row of long and stout setae. 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, with 4 medial blunt teeth, and no pointed teeth subapically; apex of claw with two rows of 3–4 thin setae laterally ( Fig. 80 ).

Abdominal terga with a moderately developed median tubercle on segments I–II, well developed on segments III–IX and less developed on segment X ( Fig. 146 ). Posterolateral projections weakly developed on segment II, moderately developed on segments III–IV, and well developed on segments V–IX ( Fig. 145 ). Gills similar to those of D. pescadori . Cerci with stout setae shorter than length of corresponding segment.

Winged stages unknown

Diagnosis. D. celebensis is similar to D. pescadori from which it can be separated by the presence of well defined row of setae on the outer margin of the foretibiae, the shape of the incisors of the mandibles and mainly by the ornamentation of the forefemora.

Etymology. The epithet comes from the Celebes, the former name of Sulawesi Island.

Remark. D. celebensis is the only teloganodid mayfly known from the Australasian Realm. The genus was already mentioned from Sulawesi by Edmunds & Polhemus (1990) under the name “ Teloganodes ” and without specific identification.

Figures

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 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 144–149. Holotypes of Dudgeodes and Derlethina in dorsal view (144, 147), abdomen in ventral view (145, 148) and in lateral view (146, 149). Figs. 144–146: Dudgeodes celebensis; Figs. 147–149: Derlethina eloisae

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.