Dudgeodes hutanis 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 : 27-35

Dudgeodes hutanis Sartori sp. nov.

( Figs. 9, 10 , 22, 23 , 28 , 35 , 41 , 49, 53 , 65, 66, 78, 91–94, 103–108, 132–134)

Material examined. Holotype: 1 male nymph, Indonesia, East Kalimantan, Malinau Basin, Seturan (2000- petak 43), Temalat (Sungai Guang), trib. Seturan , 2°59´29"N, 116°33´29"E, 16.IV.2001 (B0813), P. Derleth [ MZL]

Paratypes: 115 nymphs, same data as holotype [6 of each in FAMU, ZMH, LIPI, AMG, the remaining in MZL, of which 4 partially mounted on slide preparations]; 1 nymph, Langap Sud (1995), Ngayo, trib. Rian, 3°4´56"N, 116°30´58"E, 13.VII.2000 (B0431) P. Derleth; 15 nymphs, same locality, 14.IV.2001 (B0433), P. Derleth & M. Sartori; 13 nymphs, Seturan (2001-petak 57), Tamalang, trib. Seturan, 2°59´22"N, 116°30´29"E, 10.IV.2001 (B0513), P. Derleth; 24 nymphs, Seturan (2001-petak 57), Tamalang, trib. Seturan, 2°59´22"N, 116°30´46"E, 8.VIII.2000 (B0531), P. Derleth; 11 nymphs 2 female subimagos, with corresponding exuviae, Seturan (2000-petak 43), Temalat (Sungai Guang), trib. Seturan, 2°59´29"N, 116°33´29"E, 18.VI.2000 (B0811), P. Derleth & J.-L. Gattolliat; 8 nymphs, same locality, 16.VIII.2000 (B0812), P. Derleth & R. Schaepfer [all MZL]

Other material: 6 nymphs, Langap Sud (1997-petak 6), Belakau, trib. Rian, 3°4´4"N, 116°30´26"E, 13.VI.2000 (B0111), P. Derleth; 11 nymphs, same locality, 20.IV.2001 (B0113), P. Derleth & M. Sartori; 2 nymphs, Langap Sud (1997-petak 6), Belakau, trib. Rian, 3°4´4"N, 116°30´26"E, 7.VII.2000 (B0121), P. Derleth; 1 nymph, same locality, 18.IV.2001 (B0123), P. Derleth & M. Sartori; 3 nymphs, Seturan (1999-petak 39-40), Temalat (Sungai Guang), trib. Seturan 3°0´10"N, 116°32´24"E, 27.III.2001 (B0213), P. Derleth; 1 nymph, Langap Sud (1995), Ngayo, trib. Rian, 3°4´41"N, 116°31´11"E, 14.VI.2000 (B0410), P. Derleth; 6 nymphs, Seturan (2001-petak 57), Tamalang, trib. Seturan, 2°59´22"N, 116°30´46"E, 11.IV.2001 (B0533), P. Derleth & B. Feldemeyer; 7 nymphs, Seturan (2001-petak 57), Tamalang, trib. Seturan, 2°59´22"N, 116°30´46"E, 19.VIII.2000 (B0541), P. Derleth & R. Schaepfer; 6 nymphs, Seturan (2000-petak 44-45), Wok (Sungai Guang), trib. Seturan, 2°59´12"N, 116°33´11"E, 5.IV.2001 (B0713), P. Derleth & B. Feldemeyer; 1 nymph, Seturan (2000-petak 43), Temalat (Sungai Guang), trib. Seturan, 2°59´29"N, 116°33´29"E, 4.IV.2001 (B0823), P. Derleth; 5, nymphs, same locality, 16.IV.2001 (B0833), P. Derleth & M. Sartori; 14 nymphs, Seturan (1998-petak 32-33), Rian, 3°0´57"N, 116°32´16"E, 30.III.2001 (B1013), P. Derleth; 12 nymphs, Langap Sud (1999-petak 24), Rian, 3°1´40"N, 116°31´5"E, 11.VII.2000 (B1211), P. Derleth; 3 nymphs, Seturan (unlogged forest), Seturan, 3°0´5"N, 116°30´48"E, 28.III.2001 (B1313), P. Derleth & B. Feldemeyer; 2 nymphs, Seturan (unlogged forest), Seturan, 2°58´58"N, 116°33´30"E, 26.IV.2001 (B1423), P. Derleth & M. Sartori [all MZL]

Description. Nymph

Body length up to 4.5 mm and 4.0 mm, without cerci, in female and male nymphs respectively; cerci length subequal to body length.

General colouration very variable, ranging from middle to dark brown; young specimens generally paler; legs light to middle brown, with femora bearing 4 characteristic maculae ( Fig. 132 ). Outer margin of head fringed with a row of short, basally forked setae from in front of eyes to labrum insertion. Antennae 1.2 times head width, flagellum with 15–17 segments. Dorsal part of male eyes blackish. Labrum ( Fig. 22 ) compact, ca. 2 times wider than long, with smooth anterior emargination; dorsal face covered medially by scattered simple and long setae ( Fig. 23 ); anterior margin with a row of small thin setae. Mandibles slender with one thin seta in middle of outer margin; right mandible ( Fig. 28 ) with outer incisor composed of 3 teeth; inner incisor with 2 teeth; prostheca reduced, comprised of a cluster of thin setae; a small row of 4 long and thin setae below mola and some short setae above mola; left mandible ( Fig. 35 ) with outer incisor with 3 teeth; inner incisor with 2 teeth inserted transversely, one smaller and pointed, other large and rounded, prostheca small with a group of small setae; no setae below mola. Maxillae ( Fig. 41 ) slender, with a well developed carina, 2 indented dentisetae and 3 long setae on inner apical part and a bunch of long, simple setae at crown; inner margin at base of lacinia, with 2 feathered and long setae, one dorsally and one ventrally; maxillary palp reduced to a single simple seta. Hypopharynx ( Fig. 49 ) with superlinguae oval with a row of long, simple setae at apex. Submentum moderately developed laterally; glossae and paraglossae partially fused; paraglossae larger than glossae; labial palp three-segmented, articulation between segments 1 and 2 barely visible and indicated by a constriction; segment 3 ca. 2.5 times as long as wide ( Fig. 53 ).

Prothorax with 4 rounded tubercles on dorsal face; mesothorax with none. Forefemur (Fig. 65) dilated, ca. 1.5 times longer than wide; outer margin covered by stout and long setae, meeting a transverse row of long and pointed setae across dorsal face (Fig. 66); inner margin with a short row of long and thin setae proximally reaching distally to transverse row. Middle and hind femora similar, more slender, ca. 2 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, bearing 3–4 blunt teeth medially, and 2 pointed teeth subapically; outer tooth well developed, inner one smaller; apex of claw with two rows of 3–4 thin setae laterally ( Fig. 78 ).

FIGURES 82–97. Gill II (82, 87, 91, 95), gill III (83, 88, 92, 96), gill IV (84, 89, 93, 97), gill V (85, 90, 94) and gill VI (86) of Oriental Teloganodidae ; only upper lamellae drawn. Figs. 82–86: Teloganodes tuberculatus ; Figs. 87–90: T. jacobusi ; Figs. 91–94: Dudgeodes hutanis ; Figs. 95–97: Derlethina eloisae . All gills same scale.

Abdominal terga with a moderately developed median tubercle on segments I–V, more developed on segments VI–X ( Fig. 131 ). No posterolateral projections on segments II–IV, slightly marked on segments VI–IX ( Fig. 130 ). Gills as in Figs. 91–94; gill II with dorsal lamella operculate, oval and with entire margin; gills III– V with dorsal lamella incised medially; ventral lobe flabellate, well developed and purple on gills II–IV.

Cerci with stout setae every 2–3 segments; setae longer than length of corresponding segment.

Female subimago. Body length: 4.5 mm. Forewing length: 5.2 mm. Hindwing length: 0.7 mm.

General colouration of body blackish, without markings. Wings greyish with small paler spots scattered over surface. Forewing ( Fig. 9 ) with hind margin regularly convex. Pterostigmatic area with 7–9 crossveins reaching subcostal vein. Vein MP 2 short. Cubital field with a single long intercalary vein. Hind wing ( Fig. 10 ) small, with costal process acute. 3 longitudinal veins distinct. Gill sockets visible on segments II–V. Subanal plate rounded.

Egg. Ovoid, 160 µm by 110 µm; chorion without attachment structures, with two kinds of surfaces: a completely smooth surface on the half of egg close to polar cap ( Figs.103–104 ), and a fine punctuated surface on opposite pole ( Fig. 106 ), with a gradient in-between (in light microscopy, the area close to the polar cap appears light brown, whereas the one close to the opposite pole appears dark brown). One micropyle in equatorial area ( Fig. 107 ), directed transversely to egg axis. Polar cap with two kinds of epithema: numerous noncoiled threads ( Fig. 104 ) and coiled threads located close to margin with chorion ( Fig. 105 ). On pole opposite polar cap, a characteristic cluster of 4–5 needle-like spines ( Fig. 108 ).

Etymology. The epithet “hutanis” comes from the Indonesian word “hutan” meaning “forest” and refers to the beautiful Bulungan forest where the material comes from.

Figures

FIGURE 9–13. Dudgeodes spp. Fig. 9: Female subimago forewing of Dudgeodes hutanis; Fig. 10: Hindwing of D. hutanis; Fig. 11: Male imago forewing of Dudgeodes pescadori; Fig. 12: Hindwing of D. pescadori; Fig. 13: Genitalia in ventral view of D. pescadori.

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 132–137. Holotypes of Dudgeodes spp. in dorsal view (132, 135), abdomen in ventral view (133, 136) and in lateral view (134, 137). Figs. 132–134: D. hutanis; Figs. 135–137: D. pescadori

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.

FIGURES 126–131. Holotypes of Teloganodes spp. in dorsal view (126, 129), abdomen in ventral view (127, 130) and in lateral view (128, 131). Figs. 126–128: T. jacobusi; Figs. 129–131: T. hubbardi.

FIGURES 103–108. Egg structure of Dudgeodes hutanis (SEM pictures). Fig. 103: Shape of the egg; Fig. 104: Detail of the polar cap; Fig. 105: Detail of the lateral attachments with coiled threads; Fig. 106: Detail of the chorion; Fig. 107: Micropyle area; Fig. 108: Detail of the structure located opposite to the polar cap.