Compsoneuriella tagbanua ( Braasch & Freitag 2008 ) Braasch & Freitag, 2008

Sartori, Michel, 2014, The concept of Compsoneuria Eaton, 1881 revisited in light of historical and new material from the Sunda Islands (Ephemeroptera: Heptageniidae: Ecdyonurinae), Zootaxa 3835 (1), pp. 1-32 : 27

Compsoneuriella tagbanua ( Braasch & Freitag 2008) comb. nov.

Compsoneuria tagbanua Braasch & Freitag, 2008 , Dtsch. Entomol. Z. 55(1), p. 119, (adult, nymph)

Material examined. 2 nymphs, Philippines, Palawan, Mun. Narra , Estrella Falls , 7 km N. Narra, Taritien River, in forest , 100–200 m., 9° 18’ N, 118° 23’ E, 5.IV.1992, M. Zerning leg. [ MZL]

The nymph of this species has been incompletely described, and some important characters have not been mentioned or drawn. A complementary description is given below.

Complementary description. Coloration: see Fig. 82 .

Head: Labrum ( Fig. 74 ) moderately extended laterally, with narrow tips; anterior margin slightly concave, covered by numerous long and simple setae. Mandibles with 10–11 fimbriate or simple setae below inner incisor ( Fig. 76 ); right mandible with 5 long and simple setae below mola; left mandible with inner incisor slender and bifid, with some minute teeth ( Fig. 76 ); 6 long and simple setae below mola. Maxillae each with row of ca. 9 combshaped setae on anterior margin, medial comb-shaped setae with 11–12 teeth each; ventral surface of galea covered by scattered long and simple setae ( Fig. 77 ); proximal dentiseta bifid and fimbriate, two distal dentisetae simple. Hypopharynx with well-developed superlinguae, densely covered with long and simple setae on lateral margins, ending at tip of rounded apex of each lobe. Labium ( Fig. 75 ) with glossae with inner margin regularly convex and outer margin slightly concave.

Thorax: Hindleg with femur similar to other species, but tibia with row of submarginal bristles close to inner margin. Tarsal claw with 2 subapical teeth.

Abdomen: Posterior margin of tergites with row of large and pointed spines, together with intercalary small ones; several rows of microdenticles apparent.

Discussion. The nymph of C. tagbanua fits the present concept of Compsoneuriella with one major exception: the scattered setae on the galea are not fimbriate but simple, such as those found in the Afrotropical genus Notonurus . At the moment, it is considered as a case of convergence. Besides this, C. tagbanua does possess the characteristic dentisetae typical for Compsoneuriella , and all other characters. In addition to the scattered setae of the galea, this species differs from all others by the high number of setae below the inner incisor of the mandibles.

Figures

FIGURES 79–82. General overview of the nymphs, with emphasize on their supracoxal spurs (midleg). Fig. 79: Compsoneuria spectabilis; Fig. 80: Compsoneuria sp. from Sulawesi; Fig. 81: Compsoneuriella thienemanni; Fig. 82: Compsoneuriella tagbanua.

FIGURES 68 – 77. Compsoneuriella spp, nymphal structures. Figs 68 - 70: Compsoneuriella sp. 1 from Thailand. Fig. 68: Outline of the labium (left side paraglossa only drawn); Fig. 69: Bristles on the upper face of hind femora; Fig. 70: Posterior margin of tergite IV. Figs 71 - 73: Compsoneuriella langensis. Fig. 71: Outline of the labrum; Fig. 72: Outline of the glossae; Fig. 73: Outline of gill VII. Figs 74 - 77: Compsoneuriella tagbanua. Fig. 74: Outline of the labrum; Fig. 75: Outline of the glossae; Fig. 76: Detail of the left mandible; Fig. 77: Scattered setae on the ventral side of the galea.