Dudgeodes ulmeri 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 : 37-39

Dudgeodes ulmeri Sartori sp. nov.

( Figs. 31 , 38 , 45 , 56 , 69, 70, 138–140)

Teloganodes tristis sensu Ulmer, 1939: 627

Material examined. Holotype: 1 male nymph, Indonesia, Sumatra, stream south of Balige, 5.IV.1929, Prof. Feuerborn [code FT 6 in Ulmer, 1939] [ ZMH] According to Ulmer (1939), this material was collected by Feuerborn, but on the slide preparations made by Ulmer appears the name of Thienemann!

Paratypes: 5 nymphs, partially mounted on 4 slide preparations by Ulmer, same data as holotype [ ZMH,

MZL], 1 male subimago, same locality, but 16.IV.1929, Prof. Feuerborn [code FT16], 1 nymph Indonesia ,

Java, Lamongan area, Ranu Bedali, waterfall, in bryophytes, 21.XI.1928, Prof. Feuerborn [code FM26a]

[ ZMH]; 1 nymph, Java, dikes of fishponds at Punten, near Malang [first author translation of “Teichwirtschaft

Punten, near Malang, Gräben”], 18.X.1929, Prof. Thienemann [code P1a] [ MZL]

Description. Nymph

Body length up to 7.0 and 6.0 mm, without cerci, in female and male nymphs respectively; cerci length slightly longer than body length.

General colouration uniformly light brown, without any pattern, probably due to inadequate preservative medium added to ethanol (after the collection was deposited in ZMH in 1963? formalin?) ( Fig. 138 ). This is confirmed by the slide preparations made by Ulmer where the typical patterns of the femora are well visible and similar to those of D. hutanis (see also Ulmer, 1939, Figs. 296–298).

Antennae ca. 1.2 times head width, flagellum with 15–16 articles. Dorsal part of male eyes yellowish brown, according to Ulmer (1939, p. 627: “isabellfarben”). Labrum, mandibles and hypophayrynx similar to those of D. hutanis . Maxilla similar in shape, but inner margin at base of lacinia with one feathered and long seta dorsally, and 4 short and feathered setae ventrally ( Fig. 45 ). Labium as in D. hutanis ; labial palp threesegmented, articulation between segments 1 and 2 clearly visible, without constriction on inner margin, segment 3 less than 3 times as long as wide at base ( Fig. 56 ).

Prothorax with 4 small and flattened tubercles on dorsal face; mesothorax with none. Forefemur (Fig. 69) moderately dilated, ca. 1.8 times longer than wide; outer margin covered by stout and long setae; transverse row across dorsal face short, not reaching both margins and constituted by relatively short and stout setae (Fig. 70); inner margin with a long row of long and thin setae; proximal area of outer margin with a bunch of thin setae. Middle and hind femora similar, more slender, ca. 2.2 times longer than wide; dorsal and inner margins with a row of long and stout setae. Tibiae and tarsi as those of D. hutanis .

Abdominal terga with a weakly developed median tubercle on segment I, moderately developed on segments II–VI (V), and well developed on segments VII (VI)–X ( Fig. 140 ). No posterolateral projections on segments II–IV, moderately marked on segments V–IX ( Fig. 139 ). Gills similar to those of D. hutanis . Cerci with stout setae every 2–3 segments; setae shorter than the length of corresponding segment.

Male subimago. A single specimen in poor condition, colourless, and with wings torn.

Wing venation, as far as it can be seen, similar to that of D. hutanis .

Diagnosis. D. ulmeri can be separated from D. hutanis and D. stephani by the ornamentation of the forefemora, especially the transverse row of setae, the length of the row of setae on the inner margin, the bunch of setae on the proximal part of the outer margin (reduced to a single seta in all other species of the genus). The setae on the inner margin of the lacinia are also unique among the genus (plesiomorphic condition).

Etymology. This species is named in honour of Dr Georg Ulmer (1877–1963), who first described this species, and outstanding specialist of Ephemeroptera of Southeast Asia as well as worldwide.

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 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 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