Macunahyphes Dias, Salles & Molineri, 2005

Paula Malaquias Souto & Frederico Falcão Salles, 2016, New species of Macunahyphes Dias, Salles & Molineri (Ephemeroptera: Leptohyphidae), with taxonomic notes, European Journal of Taxonomy 254, pp. 1-15 : 2-3

Macunahyphes Dias, Salles & Molineri, 2005

Macunahyphes Dias, Salles & Molineri, 2005: 196 (type species: Tricorythus australis ( Banks, 1913) , by monotypy).

Diagnosis

Genus characterisation: 1) eyes undivided in both sexes; 2) fore wings with well-developed Cu-A lobe, especially in males; 3) longitudinal vein CuP poorly developed in both sexes or absent; 4) hind wings absent in both sexes; 5) membranous filaments of mesoscutellum present or absent; 6) styliger plate very slightly projected posteriorly as a columnar base for each pair of forceps (see figs 7–9 in Molineri et al. 2011); 7) basal swelling on forceps segment II present or absent. In the nymph: 1) maxillary palp reduced in size, one-segmented, with apical seta; 2) glossa and paraglossa almost completely fused, with a circular outline; 3) femora with numerous robust serrate setae; 4) tarsal claws long and slender, with 7–10 marginal denticles and a double row of 2–4 submarginal denticles; 5) gills present on abdominal segments II–VI, gill formula 3/3/3/3/2; 6) operculate gills subtriangular; 7) posterior margin of terga II–V smooth, other segments with denticles.

Comments

Due to the presence of membranous filaments on the mesoscutellum in females and males in one species, and to the presence of a basal swelling on forceps segment II in four species, we propose an expansion to the diagnosis of the genus provided by Dias et al. (2005) to include characters 5 and 7 above. As M. australis is the only species in which nymphs have been described, the generic diagnostic features of the nymphal stage are maintained.

Distribution ( Fig. 1 )

Argentina, Brazil, Guyana and Venezuela.

Figures

Fig. 1. Geographical distribution of species of Macunahyphes in South America and Brazil (per state).