A Reclassification of Siphlonuroidea (Ephemeroptera)
MITTEILUNGEN DER SCHWEIZERISCHEN ENTOMOLOGISCHEN GESELLSCHAFT BULLETIN DE LA SOCIETE ENTOMOLOGIQUE SUISSE 68, 103 - 132, 1995 A reclassification of Siphlonuroidea (Ephemeroptera) N. J. KLUGE1, D. STUDEMANN2*, P. LANDOLT2* & T. GONSER3 'Department of Entomology, St. Petersburg State University, St. Petersburg 199034, Ru ssia 2Department of Entomology, Institute of Zoology, Perolles, CH-1700 Fribourg, Switzerland 3Limnological Research Center, EA WAG, CH-6047 Kastani enbaum, Switzerland The superfamily Siphonuroidea is proposed, its phylogenetic position discussed and definitive char acteristics are presented for all the families contained. New characters of the thorax, the female gen italia, and the egg chorion are used. The Siphlonuroidea consist of a Northern Hemisphere group of families (Siphlonuridae s. str., Dipteromimidae, Ameletidae, Metretopodidae, Acanthametropodidae and Ametropodidae) and a Southern Hemisphere group of families (Oniscigastridae, Nesameletidae, Rallidentidae, and Ameletopsidae). The family Dipteromimidae and the subfamily Parameletinae are established. The synonymy of lsonychia polita and Acanthametropus nikolskyi is documented. Fossil Siphlonuroidea of uncertain family status are included. The rel ation ships between the families are di s cussed. Key words: eggs. Ephemeroptera, morphology, phylogeny, Siphlonuridae, Siphlonuroidea, systematics. INTRODUCTION The taxonomy and the phylogeny of Siphlonuroidea or Siphlonuridae sensu Lato are subject to different opinions. The authors that have worked on the rank and composition of this taxon (EDMUNDS, 1972; MCCAFFERTY & EDMUNDS, 1979; LANDA & SOLDAN, 1985; M CCAFFERTY, 1991; TOMKA & ELPERS, 1991; KLUGE, in press, and others) have used the taxon Siphlonuridae in different senses. These dif ferences are based on (1) the importance attached to adult versus larval characters, (2) the interpretation of characters as being synapomorphic or symplesiomorphic, (3) the paraphyletic nature of the group, and ( 4) inadequate diagnoses of many tax a.
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