Dudgeodes sartorii, Srinivasan & Sivaruban & Barathy & Isack, 2021

Srinivasan, Pandiarajan, Sivaruban, T., Barathy, S. & Isack, Rajasekaran, 2021, A new species of Dudgeodes Sartori, 2008 (Ephemeroptera: Teloganodidae) from Megamalai hills of southern Western Ghats, India, Zootaxa 4990 (3), pp. 571-576 : 572-574

publication ID	https://doi.org/ 10.11646/zootaxa.4990.3.8
publication LSID	lsid:zoobank.org:pub:EC306343-B785-4ED3-99CB-479109478C29
DOI	https://doi.org/10.5281/zenodo.5918281
persistent identifier	https://treatment.plazi.org/id/2D6C87F9-3742-FFD1-41B8-DD6DEBE07ABF
treatment provided by	Plazi
scientific name	Dudgeodes sartorii
status	sp. nov.

Treatment

Dudgeodes sartorii sp. nov.

Figs. 1–2 View FIGURE 1 View FIGURE 2

Materials examined. Holotype: Male larva ( AMC ZN 188 View Materials ), India, Tamil Nadu, Theni district, Megamalai hills, Manalar bridge, 9°69833’N & 77°40083’E; 1422 m; 22.x.2020, Cols. Pandiarajan Srinivasan & Isack Rajasekaran . Paratype: 3 nymphs ( AMC ZN 189 View Materials ), same data as holotype. The type specimens are deposited in The American College museum, Madurai, Tamil Nadu, India .

Description. Larva. Body length up to 3 mm in female and 2.5 mm in male ( Fig. 1A View FIGURE 1 ) without cerci; cerci length subequal to body length. General coloration of dorsal side of head, thorax and abdomen yellowish to brown; ventral region of entire body pale ( Fig. 1B View FIGURE 1 ); antenna with black spot increasing in size in the distal part of each antennal segment; legs yellowish; femora yellowish in middle, lateral parts paler, distal region of the inner margin bears black dotted large maculae; cerci translucent. Head: Head capsule with hair like setae on lateral margins in front of eyes to labrum insertion. Antennae length 1.3 times head width, flagellum with 14–16 segments. Antenna with black spots increasing in size in the proximal part of each segment ( Fig. 1C View FIGURE 1 ). Scape two times larger than pedicel. Dorsal part of male eyes blackish ( Fig. 1A View FIGURE 1 ). Labrum compact, ca. 2.1 times wider than long ( Fig. 1D View FIGURE 1 ), with smooth anterior emargination; dorsal face covered medially by scattered simple long setae; anterior margin with row of small thin setae. Hypopharynx with superlinguae oval with row of long, simple setae at apex ( Fig. 1E View FIGURE 1 ). Mandibles slender with one thin seta in middle of outer margin ( Fig. 1F&1G View FIGURE 1 ). Right mandible ( Fig. 1F View FIGURE 1 ) with outer incisor composed of one large entire tooth; inner incisor with two teeth; prostheca reduced, with appearance of cluster of thin setae; a small row of four long and thin setae below mola and some short setae above mola. Left mandible ( Fig. 1G View FIGURE 1 ) with outer incisor consisting of one slightly concave tooth; inner incisor with two teeth inserted transversely subequal in size; prostheca small; no setae below mola. Maxilla ( Fig. 1H View FIGURE 1 ) slender, with well-developed canina, two indented dentisetae and three long setae on inner apical region and cluster of long, simple setae at crown; inner margin at base of lacinia, with one long setae dorsally and one long setae ventrally; maxillary palp highly reduced. Submentum well developed laterally; glossae and paraglossae partially fused; paraglossae larger than glossae; labial palp threesegmented, articulation between segments I and II barely visible and subequal in length ( Fig. 1I View FIGURE 1 ); segment III ca. 1.7 times as long as wide. Thorax: Prothorax with two rounded tubercles on dorsal surface ( Fig. 2A View FIGURE 2 ). Mesothorax with two rounded tubercles on dorsal surface, smaller specimens lack tubercles on mesothorax ( Fig. 2A View FIGURE 2 ); outer margin of prothorax and mesothorax bears simple setae ( Fig. 2B View FIGURE 2 ). Forefemur ( Fig. 2C View FIGURE 2 ) greatly dilated, ca. 1.3 times longer than wide; outer margin covered by stout and long setae, meeting transverse row of narrower setae with blunt apex ( Fig. 2F View FIGURE 2 ); without thin setae at apex; inner margin with short row of long and thin setae proximally, reaching distally to transverse row. Middle ( Fig. 2D View FIGURE 2 ) and hind femora ( Fig. 2E View FIGURE 2 ) similar, more slender, ca. 1.6 times longer than wide; dorsal and inner margins each with row of long and stout setae. Tibia with row of long and stout setae on inner margin, and row of long and thin setae on outer margin. Tarsal claw hooked, bearing five blunt teeth increasing in size medially ( Fig. 2G View FIGURE 2 ) and two pointed teeth subapically; outer tooth well developed, inner one smaller ( Fig. 2H View FIGURE 2 ); apex of claw with a single row of three to four thin setae laterally. Abdomen: Terga median tubercles absent in I–III, present and increasing in size from IV–VIII and small median tubercles present in IX– X ( Fig. 2I View FIGURE 2 ); transverse longitudinal dark blackish band near the surface of posterior margin on tergal segments I–VIII ( Fig. 2I View FIGURE 2 ). Posterolateral projections absent on segments I–IV; slightly marked on segment V; distinct on segments VI–IX. Lateral margins of terga with long thin setae. Gills on segments II–V; gill II with dorsal lamella operculate, oval and with entire margin ( Fig. 2J View FIGURE 2 ); gills III–V ( Figs. 2K–2M View FIGURE 2 ) with ventral lamella incised medially; ventral lobe flabelliform, well-developed and purple on gills II–IV; gill V lacks lobes on the ventral lamella. Cerci with stout setae on each segment; setae subequal or smaller than length of corresponding segment ( Fig. 2N View FIGURE 2 ). A dark brownish band on the 5 th segment of cerci ( Fig. 2N View FIGURE 2 ).

Winged stages. Unknown.

Diagnosis. Dudgeodes sartorii sp. nov. can be distinguished from other Indian species of Dudgeodes by the following combination of characters: (i) prothorax with two rounded tubercles ( Fig. 2A View FIGURE 2 ); (ii) outer margin of mesothorax bears simple setae ( Fig. 2B View FIGURE 2 ); (iii) distinct maculae in the distal region of femora ( Figs. 2C, 2D & 2E View FIGURE 2 ); (iv) transverse row of setae on fore femora narrower with blunt apex ( Fig. 2F View FIGURE 2 ) and (v) dark brownish band on the 5 th segment of cerci ( Fig. 2N View FIGURE 2 ).

Etymology. This species is dedicated to Dr. Michel Sartori for his outstanding contribution to the Oriental Teloganodidae .

Ecology. The nymphs of Dudgeodes sartorii sp. nov. were collected in the Megamalai hills, Theni district (10– 17 m wide, 3.4–5.8 cm depth). The water current ranges about 1.98 m /sec. The water temperature ranges between 19°C–22°C and pH 7.0–7.4. Substratum is of high cobble and decayed leaf litter with high water current.

Key to known nymphs of Indian Dudgeodes

1. Prothorax with 2 rounded tubercles........................... .............................. D. sartorii sp. nov.

- Prothorax with 4 rounded tubercles....................................................................... 2

2. Whorl of spines in cerci longer than length of corresponding segment; 3 rd segment of labial palp ca. 2.5 times as long as wide........................................................................................... D. palnius

- Whorl of spines in cerci considerably shorter than the length of corresponding segment; 3 rd segment of labial palp ca. 2.7 times as long as wide......................................................................... D. bharathidasani