Diversity and Taxonomic Review Of
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Zootaxa 2662: 1–27 (2010) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ Article ZOOTAXA Copyright © 2010 · Magnolia Press ISSN 1175-5334 (online edition) Diversity and taxonomic review of Leptusa Kraatz (Coleoptera: Staphylinidae: Aleocharinae) from Great Smoky Mountains National Park, U.S.A., with descriptions of four new species JONG-SEOK PARK1,4, CHRISTOPHER E. CARLTON2 & MICHAEL L. FERRO3 Louisiana State Arthropod Museum, Department of Entomology, LSB 400, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, U.S.A. E-mail: [email protected], [email protected], [email protected] 4Corresponding author Abstract A taxonomic review of the genus Leptusa Kraatz from Great Smoky Mountains National Park is presented. Ten species are recognized, and four new species are described and illustrated: L. (Adoxopisalia) pseudosmokyiensis Park & Carlton, sp. nov., L. (A.) stocksi Park & Carlton, sp. nov., L. (Dysleptusa) gimmeli Park & Carlton, sp. nov., and L. (Eucryptusa) ferroi Park & Carlton, sp. nov. The previously undescribed female of L. (D.) pusio (Casey) is also reported for the first time. Descriptions, habitus illustrations and line drawings of diagnostic characters of all species occurring in Great Smoky Mountains National Park are provided. A key is provided that will allow discrimination of 16 of the 18 species of Leptusa known to occur in the eastern United States. “Overlooked Syndrome”, the phenomena where undescribed species persist in a well known fauna, is defined and discussed. Key words: taxonomy, Homalotini, Great Smoky Mountains National Park, Overlooked Syndrome Introduction The genus Leptusa Kraatz, 1856 includes over 400 species and is found in all geographical regions except Australia, Madagascar, and the Pacific islands (Pace 1989). After Pace (1989) published his monograph treating the world fauna of the genus, Assing described numerous species from the Palearctic fauna (Assing 2001, 2002, 2003, 2004, 2007, 2009a, 2009b, 2009c). Some North American species were treated by Gusarov (2003), and Klimaszewski et al. (2004) reviewed the Canadian species. The Coleoptera Taxonomic Working Group of the All Taxa Biodiversity Inventory (ATBI) in Great Smoky Mountains National Park (GSMNP) has been active since June 2001 (Carlton & Bayless 2007). To date 2518 beetle species have been recorded from the park including more than 40 species new to science. The ATBI and related research resulted in the collection of 194 specimens of Leptusa from GSMNP. The majority of these specimens were collected as the result of two studies by M. L. Ferro and M. L. Gimmel (unpublished). During April 2006, 90 emergence chambers were filled with hardwood coarse woody debris (CWD) of various sizes and decay classes from six locations in GSMNP. Beetles emerging from the wood were collected monthly over a period of two years. During fall, 2006 and spring, 2007 a comparison of leaf litter and coarse woody debris decay class V (see Pyle & Brown 1999 for definitions of course woody debris decay classes) habitats was conducted at the same sites. Specimens were extracted from sifted leaf litter and woody debris samples using Berlese funnels. In total ten species were identified, four of which were undescribed. We also discovered the female of L. pusio (Casey), which has not been described previously. Here we describe or provide updated redescriptions of all species of Leptusa found in the GSMNP including four new species. Redescriptions are provided to better compare and contrast newly described species with existing fauna and to facilitate recognition of additional undescribed species that might be discovered in future. Habitus illustrations and line drawings of diagnostic characters are provided for these Accepted by V. Gusarov: 4 Oct. 2010; published: 29 Oct. 2010 1 species. A key is provided that will allow discrimination of 16 species occurring in eastern United States out of the total 18 species that are known from the region. Terminology for chaetotaxy and microstructures follows Sawada (1972) and Ashe (1984), and the terminology for abdominal segments follows Thayer (2005). Specimens collected during this study are deposited in the Louisiana State Arthropod Museum (LSAM), Baton Rouge, LA and the Great Smoky Mountains National Park Collection (GSMNP), Gatlinburg, TN, U.S.A. Depositories are indicated parenthetically. Holotypes of species described herein are deposited in the Field Museum of Natural History (FMNH), Chicago. Genus Leptusa Kraatz, 1856 Leptusa Kraatz, 1856: 60; Fenyes, 1920: 120; Bernhauer & Scheerpeltz, 1926: 553; Smetana, 1973: 3; Lohse, 1974: 42; Moore & Legner, 1975: 483; Seevers, 1978: 164; Pace, 1989: 25; Ashe, 2001: 366; Assing, 2002: 971; Gusarov, 2003: 113; Gusarov & Herman, 2003a: 115, 2003b: 191; Klimaszewski et al., 2004: 3; Gouix & Klimaszewski, 2007: 61. Type species. Bolitochara pulchella Mannerheim, 1830; designated by Gusarov & Herman (2003a). Diagnosis. The genus Leptusa can be recognized by the following combination of characters: body more or less convex, parallel-sided, pubescent; microsculpture present; hind wings often absent; eye size highly variable but usually small; antennae with 11 antennomeres, thickened toward apex; mandible short, right mandible with internal tooth; distal lobe of galea membranous and pubescent; maxillary palpomere 1 smallest, 2 moderately long, 3 largest, 4 subuliform; ligula narrow and long, not bifid, rounded apically; labial palpi with two apparent articles due to fusion of articles 1–2; pronotum usually widest at apical third or anterior half; mesocoxae narrowly separated; mesoventral process longer than metaventral process (approximately 2/3 length of mesocoxae); legs usually short, tarsal formula 4-4-5, first metatarsomere as long as following two articles or slightly longer. Abdominal tergites III–VI with setigerous punctures (Pace 1989, Klimaszewski et al. 2004). Remarks. All species of Leptusa collected in GSMNP have the following combination of characters: gular sutures widely separated, approximately 1/5 width of head; each side of ventral surface of head with carinae (fading before attaining gular suture or attaining gular suture); labrum bearing 3 pairs of short setae along anterior and lateral margin (Figs. 2b–11b); median area of labium distinctly narrow or lateral areas meeting at middle, and a pair of distal setae present in a longitudinal row; mesoventrite carinate or not (if carinate, then not exceeding 1/2 length of mesoventrite). Abdominal sternites VII of males possess many pores occupying anywhere from anterior one-tenth to anterior half. Key to the Leptusa species from the eastern United States Note. Leptusa (E.) nanula (Casey, 1893) and L. obscura Blatchley, 1910 are not included in the key. See discussion. 1. Head and pronotum with coarse setigerous punctures, distance between punctures less than their diameters (Figs. 1g, 1j) ................................................................................................................................................................................. 2 - Head and pronotum with moderate sized setigerous punctures, distance between punctures more than their diameters (Figs. 1b–1f, 1h, 1i) ...................................................................................................................................................... 3 2. Antennomere 4 subquadrate (Fig. 8a); elytra unicolored (Fig. 1g); abdominal tergites VII–VIII with single median elongate tubercle (Figs. 1g, 8f) ....................................................................................... L. (Dysleptusa) pusio (Casey) - Antennomere 4 longer than wide (Fig. 11a); posterior part of elytra paler (Fig. 1j); abdominal tergites VII–VIII with- out single median elongate tubercle (Figs. 1j, 11f) ...................................................... L. (Ulitusa) cribratula (Casey) 3. Elytra not more than 1.3 times longer than pronotum (Figs. 1b, 1c, 1f) ..................................................................... 4 - Elytra at least 1.5 times longer than pronotum (Figs. 1a, 1d, 1e, 1g–1j)..................................................................... 8 4. Body length less than 2.5 mm; antennomere 4 subquadrate (Fig. 7a); hind wings absent ......................................... 5 - Body length more than 2.5 mm; antennomere 4 longer than wide (Figs. 3a, 4a); hind wings present ....................... 6 2 · Zootaxa 2662 © 2010 Magnolia Press PARK ET AL. 5. Body light reddish brown (Klimaszewski et al. 2004: Fig. 9); posterior margin of male abdominal tergite VIII with- out tubercles (Klimaszewski et al. 2004: Fig. 49); flagellum approximately 2 times longer than length of median lobe (Klimaszewski et al. 2004: Fig. 48)............................................................. L. (Adoxopisalia) elegans Blatchley - Body brown (Fig. 1g); posterior margin of male abdominal tergite VIII with tubercle (Fig. 7f); flagellum as long as 1/2 length of median lobe (Fig. 7k) ............................................................................... L. (Dysleptusa) gimmeli n. sp. 6. Antennomere 4 transverse; hind wings absent ........................................................ L. (Dysleptusa) smetanaiella Pace - Antennomere 4 longer than wide; hind wings present ................................................................................................ 7 7. Antennomere 5 longer than wide (Fig. 3a); carina on each side of surface of head incomplete (fading before attain-