Siphloplecton demoulini

Staniczek, Arnold H. & Godunko, Roman J., 2016, Revision of fossil Metretopodidae (Insecta: Ephemeroptera) in Baltic amber — Part 3: Description of two new species of Siphloplecton Clemens, 1915, with notes on the re-discovered lectotype of Siphloplecton macrops (Pictet-Baraban & Hagen, 1856), Zootaxa 4103 (1), pp. 1-24 : 20

Siphloplecton demoulini species group

Diagnosis. Male imago: (1) eyes large, unicolored, contiguous medially; (2) outer margin of femora without stout pointed setae, only with row of relatively short, filamentous setae; (3) cubital field of forewings with two pairs of intercalary veins; (4) styliger plate angulate, mediocaudally only moderately incised; incision with relatively small pronounced triangular projection; medial projection or lack, or, if present, small and bluntly pointed apically; (5) segments of forceps relatively short; basal segment conical, medioapically without hump; (6) penis shaft elongated; (7) penis significantly projects beyond styliger plate, reaching one fourth of forceps segment 2; (8) penis lobes rounded at tips; medially contiguous at almost entire length, with apical, V-shaped cleft.

A pterostigmatic area with simple, unforked cross veins is completely preserved only in the right forewing of the S. gattolliati holotype (see below), so we cannot confirm this character for the entire S. demoulini species group. However, it is not excluded that the S. demoulini species group also differs from all other fossil and extant species of Siphloplecton , which have pterostigmata with strongly anastomosed cross veins.

Species composition. Siphloplecton demoulini Staniczek & Godunko, 2012 , S. gattolliati sp. nov.