ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Illiesia Jahr/Year: 2007 Band/Volume: 03 Autor(en)/Author(s): McLellan Ian, Zwick Peter Artikel/Article: New species of and keys to South American Gripopterygidae (Plecoptera). 20-42 McLellan, Ian D. & Peter Zwick 2007. New species of and keys to South American Gripopterygidae (Plecoptera). Illiesia, 3(4):20‐42. Available online: http://www2.pms‐lj.si/illiesia/Illiesia03‐04.pdf NEW SPECIES OF AND KEYS TO SOUTH AMERICAN GRIPOPTERYGIDAE (PLECOPTERA) Ian D. McLellan 1 and Peter Zwick 2 1P.O. Box 95, Westport, New Zealand E‐mail: [email protected] 2 Limnologische Fluss‐Station des Max‐Planck‐Instituts für Limnologie, Schlitz, Germany Correspondence: Peter Zwick, Schwarzer Stock 9, D‐36110 Schlitz, Germany E‐mail: pleco‐p.zwick@t‐online.de ABSTRACT Uncicauda pirata new genus and species and Alfonsoperla flinti new genus and species are described. The larvae of the following named species are either described for the first time (1st) or corrected (cd) descriptions given: Antarctoperla altera (1st), Aubertoperla illiesi (cd), Aubertoperla kuscheli (cd), Claudioperla tigrina (cd), Limnoperla jaffueli (cd), Rhithroperla rossi (cd), Teutoperla spp. (1st). We also describe larvae of four Antarctoperlinae species that cannot be associated with adults; these new larvae are therefore not named. The larvae of the South American Gripopterygidae are keyed to genus, and some to species. Keywords: taxonomy, new genera, new species, larval descriptions, key to larvae, Neotropical region INTRODUCTION 2006a, b, Vera & Camousseight 2006) but the revision The South American Plecoptera fauna includes by Illies (1963) remains the standard publication. It representatives of all four antarctoperlarian families, includes excellent habitus illustrations of the known and also two arctoperlarian families of presumably larvae several of which were, however, only northern hemisphere origin (Zwick 2000), the tentatively associated with adults. Several larvae can Perlidae and the Notonemouridae. The Perlidae are immediately be recognized from the figures, but the very species rich, especially in the northern half of identification of others, particularly the smaller, the subcontinent. average‐looking larvae remains difficult because the In the Gondwanan part of the subcontinent the descriptions do not contain sufficient detail to Gripopterygidae are clearly the dominant family and separate the taxa reliably. are apparently more diverse than presently known. Benedetto (1975) compiled the first key to South Studies of the Plecoptera of the southeastern part of American Plecoptera in Spanish language but Brazil (Froehlich 1990, 1993, 1994, 1999, 2000, 2001, abstained from including a generic key to the larvae 2002) significantly increased the number of of Gripopterygidae. Three generic keys to Gripopterygidae known from the area of the Gripopterygidae were meanwhile published Brazilian Shield. There are some recent additions to (Bachmann 1996, Romero 2001, Heckman 2003). All the Gripopterygidae of the Andean‐Patagonian realm of them are essentially verbal descriptions of Illiesʹ (McLellan et al. 2005, McLellan et al. 2006, Vera 2005, (1963) habitus figures, with no new characters added. Illiesia – http://www2.pms‐lj.si/illiesia/ Volume 3 – Number 4 – Page 20 McLellan, Ian D. & Peter Zwick 2007. New species of and keys to South American Gripopterygidae (Plecoptera). Illiesia, 3(4):20‐42. Available online: http://www2.pms‐lj.si/illiesia/Illiesia03‐04.pdf Also, Illiesʹ occasional errors are repeated and his probably related to kind of food and feeding mode, tentative (but incorrect) associations of several larvae but may at the same time be phylogenetically accepted. In contrast, Heckman (2003) simply left all informative. For example, there is a row of setae or larvae out that were not definitely associated with spines running close to the dorsal edge of the lacinia some named taxon which also does not help. for variable distances. Distal elements in this row are Recently, (Vera 2005, Vera 2006a, b) made important usually blade‐like and may actually be lacinial teeth additions to knowledge of the South American because they seem to lack insertion points which are Gripopterygidae. He first separated the larvae of visible in the more basal setae. Usually, the large Limnoperla and Rhithroperla (2005), recognized that apical lacinial teeth are exposed (Figs. 66, 67, 89), but Illiesʹ presumed ʺAraucanioperla Aʺ is the larva of in Limnoperla jaffueli (Navás) (Fig. 68) and Potamoperla Neopentura semifusca Illies and redescribed that myrmidon (Mabille) the palisade‐like row of setae species in all life stages (2006a). Vera (2006b) also runs across the lacinial apex, in front of the apical described a true Teutoperla‐larva, but the larva teeth. The very slender lacinia of Alfonsoperla flinti sp. tentatively ascribed to this genus by Illies (1963, n. (Fig. 71) is apically grooved, like a deep narrow Larventyp X) remained unassociated. It represents a spoon. All South American Antarctoperlinae have a new genus and species which we describe below. sharply pointed bifid laciniae (Fig. 70). The galea may We describe some new taxa, including some carry an apical brush of simple straight hairs (Fig. unassociated larvae of Antarctoperlinae with very 66), a few irregular spinules (Fig. 67), or spinules distinctive characters. For the rest we focus on arranged in a row (Fig. 68). Several taxa have on the pharate males providing for safe adult‐larva outer face of galea a dense apical brush of small associations to sort out the identity of previously curved setae which intriguingly resembles the only tentatively identified larvae and to find good scraper‐brush with combed setae illustrated for structural characters distinguishing the difficult Brachyptera risi (Morton) (Taeniopterygidae) smaller members of the family. Instead of presenting (Wichard et al. 2002). formal redescriptions we incorporate the relevant We present only a few examples as an appendix information in a new key to the larvae of South (Figs. 65‐71) and suggest further study with scanning American Gripopterygidae. electron microscopy which is not available to us. A We had hoped that our studies would reveal comparative study must be based on freshly molted characters grouping the larvae at higher taxonomic specimens, to exclude all effects from wear and tear level. However, this was not the case and this dashed of scraping mouthparts (Arens 1989a, b). We do not our hopes that some light would be shed on have freshly molted specimens for a number of taxa. intergeneric relationships and gripopterygid The agreement between larval and adult laciniae is classification. On the contrary, we found examples of great, but there is never a scraping‐brush on the congeners which are very similar in the adult stage adult galea. but have drastically different larvae (for example, in Aubertoperla and Antarctoperla), but also very similar MATERIAL larvae belonging to different genera. It is obvious Large collections of South American stoneflies, that not only the parameters of some of the present mainly collected by O. S. and C. M. Flint which we genera need re‐adjusting but also the subfamily received on loan from USNM provided us with an concept pertaining to South American opportunity to improve the knowledge of the South Gripopterygidae needs reconstruction. American Gripopterygidae. We also used the There are sets of characters which have not yet material in the joint Illies and Zwick collections been adequately exploited, for example, mouth part (previously in the Limnologische Flussstation Schlitz structure. In the past, interest focused on number and ‐LFS). Because of the great number of specimens and length relationships of maxillary palp segments. In the fact that most of the specimens belonged to contrast, labium shape was never considered but known taxa and since the new material does not may differ much, compare Figs. 15, 31, and 65; all significantly alter known distributions we do not list South American Antarctoperlinae resemble Fig. 31. records of previously known species. The apical armatures of lacinia and galea are also not In this material definitely associated last instar uniform across the family. Observed differences are larvae of all taxa mentioned in this paper and Illiesia – http://www2.pms‐lj.si/illiesia/ Volume 3 – Number 4 – Page 21 McLellan, Ian D. & Peter Zwick 2007. New species of and keys to South American Gripopterygidae (Plecoptera). Illiesia, 3(4):20‐42. Available online: http://www2.pms‐lj.si/illiesia/Illiesia03‐04.pdf included in the key were available to us, except around crossveins and in some specimens a purplish larvae of Andiperlodes, Tupiperla and Guaranyperla pigment from C to M but without speckles in cells. which we know only from literature. Abdomen sexually dimorphic. Cerci yellowish, Abbreviations and measurements. Abbreviations of short, downcurved with 8‐10 segments in males and collectors’ names: BA = B. Akerberg; DA = D. 9‐11 in females. Pilosity inconspicuous. Akerberg; DD = D. Davis; MD = M. Davis; CC = Male genitalia. (Figs. 2‐4): Abdomen brownish or Cekalovic; CMF = C. M. Flint; OSF = O. S. Flint jnr.; purplish, only slightly sclerotised. Each tergite with LEP = L. E. Peña; SS = S. Schajovskoy; GB = G. Barria. an anterior sclerite band that is medially divided on In the lists of material, we use gender symbols for anterior