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Nymphs of North American Perlodinae Genera (Plecoptera: Perlodidae)

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Nymphs of North American Perlodinae Genera (Plecoptera: Perlodidae) Great Basin Naturalist Volume 44 Number 3 Article 1 7-31-1984 Nymphs of North American Perlodinae genera (Plecoptera: Perlodidae) Kenneth W. Stewart North Texas State University, Denton, Texas Bill P. Stark Mississippi College, Clinton, Mississippi Follow this and additional works at: https://scholarsarchive.byu.edu/gbn Recommended Citation Stewart, Kenneth W. and Stark, Bill P. (1984) "Nymphs of North American Perlodinae genera (Plecoptera: Perlodidae)," Great Basin Naturalist: Vol. 44 : No. 3 , Article 1. Available at: https://scholarsarchive.byu.edu/gbn/vol44/iss3/1 This Article is brought to you for free and open access by the Western North American Naturalist Publications at BYU ScholarsArchive. It has been accepted for inclusion in Great Basin Naturalist by an authorized editor of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. The Great Basin Naturalist Published at Provo, Utah, by Brigham Young University ISSN 0017-3614 Volume 44 July 31, 1984 No. 3 NYMPHS OF NORTH AMERICAN PERLODINAE GENERA (PLECOPTERA: PERLODIDAE)' Kenneth VV. Stewart- and Bill P. Stark' Abstract.— Nymphs of the type or other representative species of the 22 North American Perlodinae genera are comparatively described and illustrated for the first time. The first complete generic key for the subfamily incorporates recent nymph discoveries and revisions in classification. References to all previous nymph descriptions and illustrations and major life cycle and food habits studies are given for the 53 North American species in the subfamilv, and a listing of species and their current distributions by states and provinces is provided for each genus. The previously unknown nymph of Chcrnokrihts misnomus is described and illustrated. Ricker (1952) provided the first com- trations of mouthparts (four genera), and his prehensive study of the stonefly family Per- subsequent illustrated key to nymphs (Ricker lodidae, based largely on adult genitalia and 1959) utilized essentially those same charac- mesostemal characters, and on gills, meso- ters. However, those papers are now in- stemae, and mouthparts of known nymphs. complete since they did not include nymphs He recognized three subfamilies, Isogeninae, of the currently recognized genera Calliperla Isoperlinae, and Perlodinae. Stark and Banks, Cascadoperla Szczytko & Stewart, Szczytko (1984) discussed the subsequent dis- Clioperla Needham & Claassen, Chernokrilus parate classifications of the family by Zwick Ricker, and Oconoperla Stark & Stewart. (1973) and Ricker and Scudder (1975), and, Nymphs of Osobenus yakamae (Hoppe) and based upon a comprehensive SEM study of Rickera sorpta (Needham & Claassen) [= ve- eggs of world genera: (1) reaffirmed Zwick's nusta Jewett] were briefly described by Jew- recognition of only two subfamilies, Isoper- ett (1955) and included in Bicker's (1959) linae and Perlodinae, and (2) recognized key. Calliperla and Chernokrilus nymphs three tribes of the Perlodinae, Aroynoptery- have remained unknown, and, at the time of gini, Diploperlini, and Perlodini, containing the two definitive Ricker papers (1952, 36 genera. 1959), Cascadoperla (Szczytko & Stewart The nymphs of Perlodidae have remained 1979) and Clioperla (Szczytko & Stewart relatively poorly known and/or incompletely 1981) were included in the Isoperla, and described and illustrated, and therefore have Oconoperla (Stark & Stewart 1982) had not not been comparatively studied. Ricker been discovered. Szczytko and Stewart (1952) included notes on nymphal mouth- (1984b) described the nymph of Calliperla parts, mesosternae, and gills, and a few illus- luctuosa (Banks), and the poorly known 'Study supported in part by National Science Foundation Grant 78-12565 and the faculty research funds of North Texas State University and Mississippi College. 'Department of Biological Sciences, North Texas State University, Denton, Texas 76203. 'Department of Biology, Mississippi College, Clinton, Mississippi 39058. 373 374 Great Basin Naturalist Vol. 44, No. 3 nymph of Rickera sorpta (Needham & Claas- ticular attention to those that were unknown, sen). Based upon study of all life stages, they rare, and inadequately described and illus- moved the genus Rickera from Isoperlinae to trated. The collection of correlated nymphal Perlodinae, and recognized seven genera in study material necessary for this undertaking the Isoperlinae {Rulgaroperla, Calliperla, Cas- was successfully completed in early 1983. cadoperla, Cliaperla, Isoperla, Kaszabia, and Mesoperlina). Shepard and Stewart (1983) de- scribed the nymphal gills of all current Per- Materials and Methods lodidae generic types except Chernokrilus, Mature nymphs of type species and others which is gill-less (see description below). were correlated by one or more of the fol- Our objective in this study was to provide lowing methods: reared in styrofoam con- an updated account of nymphs of the 22 (1) tainers in the field (Szczytko & Stewart North American Perlodinae genera, utilizing 1979), (2) transported on ice in styrofoam recent nymph discoveries and revisions in containers by auto or aircraft then reared in classification. The first complete generic key an environmental chamber or living stream that follows is therefore based upon our study at simulated stream temperatures, or of known nymphs. The comparative descrip- (3) heated gently in a 10% KOH solution and tions and illustrations under each genus are nymphal cuticle removed to reveal under- based upon nymphs of the type species, ex- lying adult genitalia. cept in Cultus Ricker and Isogenoides Extracted mouthparts were prepared for Klapalek, where good correlated nymphs of SEM study (Stark & Stewart 1981) and pho- the type species were unavailable, and Diura tographed using an AMR 1000 scanning elec- Billberg and Megarcys Klapalek, whose types tron microscope at the University of Mis- are distributed outside North America. In sissippi Dental School. Drawings were then these four instances, common North Ameri- made of mandibles and maxillae from the can species whose nymphs were considered SEMs, making sure that setation and other il- representative of the genus were used. This lustrated characters could be seen with a approach provides a complete treatment of stereo dissecting microscope. Nymphs were nymphs of the 9 monospecific genera, and a studied under a Wild M-5A stereo- useful morphological baseline for the eventu- microscope, and gills, front legs, mesosternae, al exhaustive study and analyses of nymphs of abdominal venters, and cerci were drawn us- all species in the remaining 13 genera. The ing a Wild Drawing Attachment. Head-pro- only comparative studies of all nymphs in a notal patterns were prepared on genus have been for Diphperla (Kondratieff stippleboard, and carbon dust habitus draw- et al. 1981), Helopicus (Stark & Ray 1983), ings were prepared from our pencil sketches. and Hydroperla (Ray & Stark 1981). Accounts of each genus below also include: (1) refer- ences to all previous descriptions of North Key to Subfamilies of Mature American nymphs in each genus and major North American Perlodidae Nymphs life cycle and food habits studies, and (2) a list of current North American species and There are no known characters that uni- their known distributions by states and pro- formly separate nymphs of Isoperlinae from vinces. We began collecting and rearing Perlodinae; however, the following key nymphs of Perlodidae in 1978, giving par- should be helpful. 1. Gills absent; lacinia bidentate (except in few eastern Isoperla species) and sometimes quadrate in shape; abdomen of Calliperla, Cascadoperla and most Isoperla with dark, longitudinal stripes Isoperlinae — Combinations of submental, cervical, and thoracic gills present or absent; lacinia unidentate or bidentate and triangulate in shape; Ab without longitudinal stripes (except Osobenus) Perlodinae July 1984 Stewart, Stark: Plecoptera Nymphs 375 Key to the 22 Genera of latitudes of the continent); WNA— Western North American Perlodinae Nymphs North America (Rocky Mountains, west- ^^rd); ENA-Eastern North America (Mis- Geographic range of each genus is in- dicated by the following coded abbreviations sissippi Valley, eastward); PNW-Pacific (after Baumann 1976); PNA-Pan-North Northwest; SW-Southwest; IW-Inter- America (widely distributed eastern and mountain West; NE-Northeast; SE- westem); ANA-Amphi-North America (dis- Southeast. tinct eastern and western populations, usually Illustrated characters referenced in the key in northern latitudes); NNA— Northern North are indicated by arrows on appropriate Figs. America (distributed widely across northern 1-22. 1. Gills present on 2 or more thoracic segments (Figs 12 F, E, 14 D, F) 2 — Gills absent from thoracic segments 5 2. Prothoracic gills present (Figs. 12 F, 16 F) 3 — Prothoracic gills absent (Fig. 20 F) Setvena 3. Lateral abdominal gills present on segments 1-7 (Fig. 14 D) Oroperla — Abdominal gills absent 4 4. Anterior prothoracic gills (appearing as cervical) present, in addition to anterior supracoxal gills (Fig. 16 F) Perlinodes — Prothorax with only anterior supracoxal gills (Fig. 12 E) Megarcys 5. Lacinia unidentate (Figs. IOC, 18 C, 19 B) 6 — Lacinia bidentate (Fig. 1 B) 8 6. Lacinia broad basally, abruptly narrowed into a long, terminal spine (Fig. 18 C): mature nymph < 10 mm; ENA Remenus — Lacinia gradually narrowed from base to terminal spine (Figs. 10 C, 19 B); mature nymph > 15 mm; WNA 7 7. Mesostemal furcal pits connected by transverse
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