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Private Library Of. William L. Peters PRIVATE LIBRARY OF. WILLIAM L. PETERS A Revision of the Genus Ephemerella (Ephemeroptera: Ephemerellidae) VI. The Subgenus Serratella in North America1 RICHARD K. ALLEN AND GEORGE F. EDMUNDS, ]R. 2 University of Utah, Salt Lake City ABSTRACT The 13 known species of the subgenus Serratella in­ E. teresa Traver ( =E. cognata Traver), new synonymy. clude E. (S.) velmae from California. This new species, Illustrated keys are given to the known nymphs and like E. carolina Berner and Allen, and E. spiculosa Ber­ adults, and distributions and complete synonymies are ner and Allen, is known only from the nymphal stage. given for each species. Ephemerella molita McDunnough is of uncertain status; J Part I of this revision (Allen and Edmunds 1959) lobes with a lateral subapical projection, if lateral dealt with the subgenus Timpanoga Needham, Part processess are lacking then foretibia is longer than II (Allen and Edmunds 1961a) with the subgenus foretarsus, and ( 4) third foretarsus shorter than Caudatella Edmunds, Part III (Allen and Edmunds second. 1961 b) with the subgenus A ttenuatella Edmunds, The nymphal stages are characterized by the fol­ Part IV (Allen and Edmunds 1962a) with the sub­ lowing combination of characters : ( 1) imbricated genus Dannella Edmunds, and Part V (Allen and gi•lls on segmmts 3 to 7 (fig. 1), (2) ventral margin Edmunds 1962b) with the subgenus Drunella Need­ of fore femora without tubercles, ( 3) maxillary pal pi ham. absent or reduced in size (fig. 41, as compared with In the following species accounts, collections made fig. 42, not reduced), and ( 4) caudal filaments sub­ by the authors are indicated by the initials GFE equal with whorls of apical segmental spines and and/or RKA. Abbreviations for collections in which usually without intersegmental setae; when present specimens are deposited are as follows: AMNH, they are sparse (fig. 16). American Museum of Natural History; CAS, Cali­ As treated here, the subgenus S erratella contains fornia Academy of Sciences; CNC, Canadian Na­ 13 North American species: Ephemerella deficiens tional Collection; CU, Cornell University; INHS, Morgan, E. levis Day, E. velmae new species, E. Illinois Natural History Survey; JRT, J. R. Traver sordida McDunnough, E. frisoni McDunnough, E. personal collection; OSU, Oregon State University; micheneri Traver, E. tibialis McDunnough (=an­ SC, Sheridan College; UCSC, University of Cali­ gusta Traver, 1934: 211), E. teresa Traver (=cog­ fornia, Sagehen Creek Station; UF, University of nata Traver 1934: 231, NEW SYNONYMY), E. serra­ Florida; VKM, V. K. Mayo personal collection. toides McDunnough, E. serrata Morgan, E. spiculosa Specimens without designation are deposited in the Berner and Allen, E. carolina Berner and Allen, and collection of the University of Utah. E. molita McDunnough which is herein considered to have uncertain status. In addition to these North Subgenus Serratella Edmunds American species the subgenus is represented by (Ephemerella) Section 'II McDunnough 1931b, 203. three other species in Asia. (Ephemerella) serrata group Traver 1932, 146; Traver The following keys will serve to identify the 1935, 565; Traver 1937, 73; Burks 1953, 65. Serratella Edmunds 1959, 544 (as subgenus); type species of the subgenus Serratella. serrata Morgan, by original designation; Berner and MALE IMAGOES3 Allen 1961, 149. 1. Wes tern North American species ; eastern McDunnough (1931b) divided the genus Ephem­ limits in New Mexico, Colorado, Wy- erella into five sections. Into one of these he placed oming, Montana, and Alberta (fig. 66) _______ 2 five species, Ephemerella deficiens Morgan, E. Eastern North American species; western sordida McDunnough, E. frisoni McDunnough, E. limits in Mississippi, Missouri, Illinois, Michigan, and Ontario (figs. 67, 68) ___________ 5 serratoides McDunnough and E. serrata Morgan. 2 ( 1). Penis lobes with lateral, subapical projection Traver ( 1935) placed 11 North American species (figs. 2, 3 )---- ------------------------------ ___________________ 3 together as the serrata group, and Edmunds ( 1959) Penis lobes without a lateral, subapical pro- jection (figs. 4, 5) ________________________________________ 4 named them as the subgenus Serratella. 3 (2). Fore tibia longer than fore tarsus; genitalia The subgenus Serrate/la may be characterized in as in fig. 2--------------------------------------------- micheneri the male adult by the following combination of char­ Fore tibia shorter than fore tarsus; genitalia aoters: ( 1) lateral cerci and median terminal fila­ as in fig. 3 _______________ -------------------------------------- levis ment subequal, ( 2) terminal segment of genital for­ 4 (2). Penes constricted near base; inner margin of each penis lobe with a subapical notch ceps less than twice as long as broad (figs. 2 to 10), (fig. 4) __________________________________________________________ tibialis ( 3) penes without dorsal or ventral spines and penis Penes not constricted near base, sides nearly parallel ; inner margin of each penis lobe 1 Accepted for publication July 23, 1962. without a subapical notch _______________________ teresa 2 The research upon which this report is based was supported by grants from the National Science Foundation and the Uni­ 3 The male imagoes of E. velmae, E. carolina, E. molita, and versity of Utah Research Fund. E. spiculosa are unknown. 583 584 ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA [Vol. 56 5 (1). Abdominal sterna with four black dots; tu- 6 (5). Caudal filaments with dark brown annulation bercle between bases of forceps truncate, at apex of each segment ___________________________________ 7 and genitalia as in fig. 6___________________ serratoides Caudal filaments unicolorous, without annu- Abdominal sterna without such black dots ; lations ______________________________________________________________________ 8 tubercle between bases of forceps rounded, 7 ( 6). Abdominal segments light brown ; penes with and genitalia not as above (figs. 7-10) ________ 6 small, lateral spines (fig. 7) ____________________ serrata PLATE I FrG. 1.-Ephemerella tibia/is, mature female nymph, dorsal view. 1963] ALLEN AND EDMUNDS: REVISION OF THE GENUS EPHEMERELLA. VI 585 10' PLATE II FrGs. 2-10.-Subgenus Serratella, male genitalia, dorsal view. FrG. 2.-E. micheneri; FrG. 3'.-E. levis; FrG. 4.­ E. tibialis; FIG. 5.-E. teresa; F1G. 6.-E. serratoides; FIG. 7.-E. serrata; FIG. 8.-E. deficicns; FIG. 9.-E. frisoni; FIG. 10.-E. sordida. 14 1~ 586 1963] ALLEN AND EDMUNDS: REVISION OF THE GENUS EPHEMERELLA. VI 587 Abdominal segments dark chocolate brown; Abdominal terga with paired, submedian tu­ penes without such small spines (fig. 8) ___ _ bercles (figs. 20--25); maxillary palpi pres- ------------------------------------·---------------------------------deficiens ent; legs and tarsal claws variable ________________ 7 8 (6). Abdominal terga 2 to 7 of dried specimens 7 (6). Pronotum with paired, submedian tubercles ; white with small, paired, light brown, lat­ vertex of head with fine spicules (figs. eral maculae; abdominal terga 2 to 7 of 11-13) ----------------------------- ---------------------------------------- 8 alcohol specimen translucent white, without Pronotum without paired, submedian tuber- maculae; genitalia as in fig. 9 ________________ frisoni cles ; head without fine spicules ____________________ lO Abdominal terga 2 to 7 of dried specimen 8 (7). Head with paired, submedian, occipital tuber­ dark brown, with darker brown sublateral cles (fig. 11) ; abdominal terga with tu­ maculae ; abdominal terga of alcohol speci­ bercles on segments 3 to 9 (fig. 21) ; legs men white, with brown sublateral maculae; brown with dark brown markings (fig. genitalia as in fig. lO _______________________________ sordida 32) ; tarsal claws with 5 to 7 denticles (fig-. 60) --------------------------------------------------- carolina NYMPHS Head without tubercles (fig. 12) or only 1. Wes tern North American species; eastern roughened (fig. 13); abdominal terga with limits in New Mexico, Colorado, Wy- tubercles on segments 3 to 7 or 3 to 8; oming, Montana, and Alberta ________________________ 2 legs and tarsal claws variable ________________________ 9 Eastern North American species ; western 9 (8). Head without tubercles, covered with numer­ limits in Mississippi, Missouri, Michigan, ous fine spicules (fig. 12) ; abdominal terga Illinois, and Ontario _________________________________________ 6 with tubercles on segments 3 to 7 (fig. 2 (1). Abdominal terga without paired, submedian 20) ; maxillary palpi with a single seg­ tubercles, posterior margins of terga with ment (fig. 49); legs pale with brown only slight undulations ; legs yellowish markings (fig. 33) ; tarsal claws with 6 to brown with dark brown bands (fig. 26) ; 8 denticles (fig. 61) -------------------- ________ spiculosa tarsal claws with 4 to 7 denticles (fig. 54) Head roughened and with only scattered ------------------------------------ __________________________________________ [eyis spicules (fig. 13) ; abdominal terga with Abdominal terga with paired, submedian tu­ tubercles on segments 3 to 8 (fig. 22) ; bercles (figs. 17-25); legs and tarsal claws maxillary palpi three-segmented (fig. SO) ; variable ___________________________________________________________________ 3 legs brown with dark brown markings 3 (2). Paired, submedian tubercles on abdominal (fig. 34); tarsal claws with 3 to 5 denti­ segments 4 to 7 only (fig. 17) ; legs uni­ cles (fig. 62 )----------------------------------------------· serrata colorous
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