Carlo Belfiore

Ootaxonomic investigation of the Italian species of the genus Electrogena (Ephemeroptera, Heptageniidae)

Abstract The egg chorion of the Italian species of the genus Electrogena was investigated using the scanning electron microscope (SEM). The eggs examined showed distinctive chorionic patterns. Electrogena grandiae, E. lateralis and E. zebrata showed attachment structures characterized by knob‐terminated coiled threads (KCTs). These structures were uniformly scattered over the egg surface in E. grandiae, while in E. lateralis they differed in size and position. In E. zebrata, the attachment structures were of uniform size and formed a dense mat over the whole egg surface. In contrast, no specialized sculptures were found in E. fallax and E. gridellii. The different chorionic patterns allowed specific identifications. The affinities and the taxonomic position of the species examined are discussed.

Taxonomic characters for species identification in the genus Electrogena Zurwerra and Tomka, with a description of Electrogena hyblaea sp. n. from Sicily (Ephemeroptera, Heptageniidae)

16 diagnostic characters of larvae for a taxonomy ofElectrogena species are listed, briefly described and coded for future reference. Male and female imagines, eggs and larvae of a new species of this genus, E. hyblaea sp. n., are described, with a list and commentary of the diagnostic character states of larvae. The new species is distributed only in Southeastern Sicily, and flies from May to November.

Estimating genetic variation from larvae and adults of mayflies: An electrophoretic analysis of three species of heptageniidae (ephemeroptera)

Abstract Genetic variation in larvae and imagines of three species of Heptageniidae from central Italy, Ecdyonurus sp. (venosus group), Elec‐trogena grandiae (Belfiore, 1981), and Electrogena lateralis (Curtis, 1834) was studied by starch‐gel electrophoresis. Thirteen enzyme systems were analysed for a total of 20 loci (Aat, Ada, Adk‐1, Adk‐2, Ck‐1, Ck‐2, Est‐1, Est‐2, α‐Gpdh, Gpi, La‐1, La‐2, Mdh‐1, Mdh‐2, Me‐1, Me‐2, Mpi, Pap, Pgm‐1, Pgm‐2), 15 of which were expressed in adults and 16 in the larvae. Only 11 loci (Aat, Ada, Est‐2, Gpi, La‐2, Mdh‐1, Me‐2, Mpi, Pap, Pgm‐1, Pgm‐2) were shared by larvae and adults. Observed heterozygosities were always lower than expected values; higher values were observed in larvae than in adults. Fixation indices and genetic distances were higher in the adults; however, the two genera were better discriminated using the larval samples. In conclusion, comparisons using larvae and adults simultaneously should be avoided, and absolute values of genetic identities and genetic...

On the Italian Species of the Ecdyonurus lateralis Group (Ephemeroptera, Heptageniidae)*

Abstract Taxonomy and nomenclature of the Italian members of the Ecdyonurus lateralis group are reviewed, the three Italian species are keyed. Ecdyonurus grandiae sp. n. (= Heptagenia lateralis sensu Grandi, 1953) is named, some characters of E. lateralis (Curtis, 1834)(= E concii Grandi, 1953; s y n . n.) and E. gridellii (Grandi, 1953) are also described. Lectotypes are designated for E. concii and E. gridellii.

On the type specimens of Electrogena zebrata (Hagen, 1864) and E. fallax (Hagen, 1864) (Ephemeroptera) 1

Lectotypes for Baetis zebrata Hagen, 1864 and B. fallax Hagen, 1864 are designated. Both species are redescribed from fresh and type material. They are transferred to the recently described genus Electrogena Zurwerra & Tomka, 1985.

Notes on Italian Heptageniidae (Ephemeroptera). Rhithrogena fiorii Grandi, 1953 and R. adrianae sp. n.

Abstract Rhithrogena adrianae a new species related to R. diaphana Nav., is described from nymphs and male imagines collected in Central Italy. Taxonomic characters of nymphs and males of R. fiorii Grandi, whose nymphal stage was previously unknown, are also described and figured. Lectotype is designated for R. fiorii.

Taxonomy of Electrogena antalyensis (Kazanci & Braasch, 1986) (Ephemeroptera, Heptageniidae)

Female imagines, subimagines, eggs and larvae of Electrogena antalyensis (Kazanci & Braasch) from Turkey are described for the first time. The results of a thorough analysis of larvae, based on the standard set of diagnostic characters for the identification of Electrogena species, are reported. The peculiarity of several characters places E. antalyensis in an isolated position within the genus Electrogena.

Morphological and Electrophoretic Evidence for a New Species of Electrogena from Central Italy: Description of E. lunaris sp. n. (Ephemeroptera: Heptageniidae)

A population of Electrogena from central Apennine (Italy), previously attributed to E. later‐alis (Curtis) proved to be a new species after electrophoretic analysis. Imagines of the new species, named E. lunaris sp. n. differ from E. lateralis only by body and wing colouration. Larvae can be identified by numerical methods. Electrophoresis indicated three loci (Aldh, Gdh, Mpi) that are diagnostic between the syntopic populations of E. lunaris and E. lateralis and the allele frequencies of three other loci (Est‐2, Mdh‐1, Pgm) were statistically different between the two species.

A multimethod approach to the zoogeography of the Italian river basins, based upon distributional data of freshwater invertebrates. I. The genus hydraena kugelann s.l. (coleoptera, hydraenidae)

Abstract This study aims to provide a basis for detecting a zoogeographic regionalization of Italian river basin networks. Ninty‐six ≪primary units≫ based upon dimensional, lithological and geomorphological criteria have been considered. Similarity and information analyses, based upon distributional data of sixty‐two species of the genera (or subgenera) Hydraena and Haenydra, have been carried out to group these units into districts. The resulting regionalization in nine main districts substantially agrees to some extent with earlier analyses based on classical historical biogeography. As a parallel development of the method, the patterns of biodiversity and some aspects of the zoogeography of Italian Hydraena s.l. have also been discussed.

Contribution to the Knowledge of the Heptageniidae of Greece, with a description of Ecdyonurus moreae sp.n. (Ephemeroptera) 1

Ecdyonurus moreae sp.n. is described from Peloponnese, Southern Greece. Diagnostic characters are: stout and rounded penis lobes, oblique stripes on the sides of abdomen, and abdominal ganglia pigmented. 12 further taxa from Greece are listed and briefly discussed: 3 species are new for Greece.