Compsoneuria lieftincki ( Ulmer, 1939 )

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 : 11-12

Compsoneuria lieftincki ( Ulmer, 1939)

Heptagenia lieftincki Ulmer, 1939 , Arch. Hydrobiol. Suppl. 16, p. 571, male and female imagos

Compsoneuria lieftincki Webb et al., 2006 , Zootaxa 1335, p. 59

Material examined. Two males and one female syntypes with subimaginal exuviae, Indonesia, West Java, Djasinga, Tjibarangbang River , 150m., caught at light in the evening above the river, 6.VII.1935, Lieftinck leg [ ZMH].

Description. Male imago. (Note: Only significant characters are mentioned here; for a complete description see Ulmer 1939).

All specimens faded. Forewings translucent, except costal and subcostal fields milky. Hindwings entirely colored in light brown, color presumably more pronounced on fresh material.

Foreleg similar to C. spectabilis , with first segment of tarsus very short ( Ulmer, 1939, fig. 160).

Forewing ( Fig. 22 ) with 12 crossveins in costal and subcostal fields; row of crossveins readily apparent in middle of radial-median field, crossveins on distal part of radial field less distinct. Overall number of crossveins greater than number in other species (> 90).

Gonopods, styliger plate and genitalia characteristic of genus ( Fig. 23 ). Penis lobes ( Fig. 24 ) with small apical spine at base of well-developed apical sclerite, protruding outwards slightly, giving apex of lobe more concave appearance than found in other species; subapical spine and titillators slender; basal sclerite not easily observed, with only acute and long spine visible; lateral sclerite broad and quadrate.

Nymphal stage unknown.

Discussion. Ulmer (1939) described this species in the genus Heptagenia Walsh, 1863 , because the first segment of the hind tarsus is not longer than the second. As illustrated by Ulmer (1939, fig. 161), this first segment is subequal in length to the second one in H. lieftincki . The presence of a transverse suture on the mesonotum, together with the median depression of the furcasterum of mesothorax subparallel clearly indicates that C. lieftincki belongs to the subfamily Ecdyonurinae and therefore cannot be a member of the Heptageniinae where belongs the genus Heptagenia . Consequently, the combination proposed by Webb et al. (2006) is followed here. Compsoneuria lieftincki possesses genitalia in accordance with the actual concept of Compsoneuria , but the forewing venation is intriguing since it possesses many more crossveins than in C. spectabilis . Compsoneuria lieftincki exhibits few crossveins in the costal and subcostal fields, as in C. spectabilis , together with rows of crossveins in the radial and median fields, together with the reduced first tarsal segment of the forelegs.

The female of C. lieftincki described by Ulmer (1939, p. 573) does not belong to the same species or even genus as the male mentioned here, because of the wing venation with numerous crossveins in the costal and subcostal fields and the hind leg proportions, the latter being already mentioned by Ulmer (1939, p.574) as something strange (“auffällig”).

Figures

FIGURES 22 – 24. Compsoneuria lieftincki (Ulmer), male imago. Fig. 22: Forewing; Fig. 23: Genitalia; Fig. 24: Penis structure in ventral (left) and dorsal (right) view.