A revision of Oriental Teloganodidae (Insecta, Ephemeroptera, Ephemerelloidea) Author Sartori, Michel Museum of zoology, Palais de Rumine, Place Riponne 6, CH- 1014 Lausanne, Switzerland. E-mail: michel. sartori @ vd. ch Laboratory of Aquatic Entomology, Florida A & M University, Tallahassee, FL 32307, USA Author Peters, Janice G. Author Hubbard, Michael D. text Zootaxa 2008 2008-12-05 1957 1 1 51 https://biotaxa.org/Zootaxa/article/view/zootaxa.1957.1.1 journal article 10.11646/zootaxa.1957.1.1 1175­5334 5241137 022AA6BC-851A-4980-9879-060B38FA51A5 Dudgeodes Sartori gen. nov Type species: Dudgeodes pescadori Sartori sp. nov. by present designation = Teloganodes sensu Ulmer and subsequent authors, nec Eaton, 1882 ( hutanis + stephani + pescadori + celebensis + ulmeri ) Description. Adult: forewing long and slender, posterior margin regularly convex ( Figs. 9, 11 ). Pterostigmatic area with 7–10 crossveins reaching subcostal vein; vein MP 2 short and free or long and attached to CuA and MP 1 , cubital field with 1– 4 intercalary veins. Hind wing small with costal process acute; 3 longitudinal veins well developed ( Figs. 10, 12 ). Claws of all legs dissimilar, one obtuse, the other hooked. In male foreleg, length of tibia ca. 1.8 length of tarsus. Styliger plate slightly concave medially. Male gonopods ( Fig. 13 ) threesegmented; first segment subequal in length to second and third combined; third much reduced. Penis lobes completely fused, except at apex, elongated but shorter than gonopods ( Fig. 13 ). Subanal plate of female slightly rounded. Gill socket vestiges visible on segments II–V. Terminal filament absent. Nymph ( Figs. 132, 135 , 138, 141 , 144 ): Body flattened, eyes in dorsal position blackish or yellowish in male nymphs; head capsule with hair like setae on lateral margins ending in front of eyes. Labrum covered with numerous long and simple setae ( Fig. 22 ). Forefemora broad and dilated with a transverse row of setae on dorsal face (Figs. 65, 67, 69 71 73). Gills on abdominal segments II–V (Figs. 91–94); gills II–IV with ventral lobes, gill V without; gills III–V incised. Abdominal carina (median tubercles on terga) well or poorly developed. Posterolateral expansions poorly or well developed. Lateral margins of terga with long and thin setae. Terminal filament absent. Egg: ovoid, chorion lacking attachment structures, one polar cap with epithema; a row of polygonal chorionic structures close to the epithema ( Figs. 103–114 ). Etymology. The new genus is an arbitrary combination of letters to honour Prof. David Dudgeon ( Hong Kong University) for his outstanding contributions to the ecology of Oriental aquatic macroinvertebrates, especially mayflies; followed by the suffix – odes to remember its relationship with Teloganodes . The gen- der is masculine. Diagnosis. The genus Dudgeodes is easily distinguished from Teloganodes by the following characters: in the adult stage, outer margin of forewing regularly convex, hindwing smaller with acute costal process, tarsi of male foreleg shorter than in the previous genus, styliger plate not strongly convex; in the larval stage, by the absence of gill VI and last gill always incised (entire in Teloganodes ), by the shape of the incisor of the right mandible and by the single seta on the ventral face of the galea-lacinia (except multiple in D. ulmeri ). Species included: Dudgeodes hutanis Sartori sp. nov. (Borneo) Dudgeodes lugens ( Navás, 1933 ) comb. nov. ( China ) Dudgeodes stephani Sartori sp. nov. (Borneo) Dudgeodes ulmeri Sartori sp. nov. ( Java, Sumatra ) Dudgeodes pescadori Sartori sp. nov. ( Philippines ) Dudgeodes celebensis Sartori sp. nov. ( Sulawesi ) Distribution. From South China , throughout Southeast Asia up to Sulawesi (Australasian Realm) FIGURES 65–76. Forefemur (65, 67, 69, 71, 73, 75) and setae on the transverse row (66, 68, 70, 72, 74, 76) of Dudgeodes spp. and Derlethina eloisae . Insertion of the setae on the margins indicated by dots; only some setae drawn. Figs. 65–66: D. hutanis ; Figs. 67–68: D. stephani ; Figs. 69–70: D. ulmeri ; Figs. 71–72: D. pescadori ; Figs. 73–74: D. celebensis ; Figs. 75–76: D. eloisae . Femora at same scale; setae at same scale.