Tackling Generic Limits for the Neotropical Philonthina

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Tackling Generic Limits for the Neotropical Philonthina Tackling generic limits for the Neotropical Philonthina with a phylogenetic approach revision of the genera Linoderus Sharp and Odontolinus Sharp (Coleoptera: Staphylinidae) Chani-Posse, Mariana; Solodovnikov, Alexey Published in: arthropod systematics & phylogeny Publication date: 2017 Document version Publisher's PDF, also known as Version of record Document license: Unspecified Citation for published version (APA): Chani-Posse, M., & Solodovnikov, A. (2017). Tackling generic limits for the Neotropical Philonthina with a phylogenetic approach: revision of the genera Linoderus Sharp and Odontolinus Sharp (Coleoptera: Staphylinidae). arthropod systematics & phylogeny, 75(1), 83-97. Download date: 08. apr.. 2020 75 (1): 83 – 97 24.4.2017 © Senckenberg Gesellschaft für Naturforschung, 2017. Tackling generic limits for the Neotropical Philonthina with a phylogenetic approach: revision of the genera Linoderus Sharp and Odontolinus Sharp (Coleoptera: Staphylinidae) Mariana Chani-Posse *, 1, 2 & Alexey Solodovnikov 2 1 Laboratorio de Entomología, Instituto Argentino de Investigaciones de las Zonas Aridas (IADIZA, CCT CONICET, Mendoza), Casilla de Correo 507, 5500 Mendoza, Argentina; Mariana Chani-Posse * [[email protected]] — 2 Natural History Museum of Denmark, Zoologi- cal Museum, Universitetsparken 15, Copenhagen 2100, Denmark — * Corresponding author Accepted 22.xi.2016. Published online at www.senckenberg.de/arthropod-systematics on 5.iv.2017. Editor in charge: Joseph McHugh Abstract A systematic revision and a phylogenetic analysis of the Neotropical genera Linoderus Sharp, 1885 and Odontolinus Sharp, 1885 (Sta phy­ lininae: Staphylinini: Philonthina) including a broad selection of outgroup taxa is presented. Two valid species are recognized for Lino derus: L. gracilipes Sharp and one new species, L. alajuelensis sp.n. Linoderus navarretei López­García & Méndez­Rojas, 2014 is excluded from the genus Linoderus and synonymized with Belonuchus albovariegatus Bernhauer, 1916. Two valid species are recognized for Odontolinus: O. fasciatus Sharp and a new species, O. campanensis sp.n. Lectotypes are designated for Linoderus gracilipes Sharp, Odontolinus fasciatus Sharp and Belonuchus albovariegatus Bernhauer. The phylogenetic analysis shows both Odontolinus and Linoderus as monophyletic genera that form together with other Central and South American Philonthina a well­supported clade within the Neotropical lineage of this subtribe. The systematic utility of sexually dimorphic characters within the Neotropical lineage is discussed. Key words Staphylininae, Philonthina, systematics, Neotropical, Central America, Linoderus, Odontolinus. 1. Introduction Philonthina is the largest and most globally distribut­ ries (CHANI-POSSE 2014a). Recently CHANI-POSSE (2013, ed subtribe within the mega­diverse rove beetle tribe 2014a) provided a phylogenetic framework and a regional Staphylinini, and includes 30 genera with over 520 de­ generic key for the Neotropical Philonthina. In particu­ scribed species currently known to occur in the Neotropi­ lar, CHANI-POSSE (2013) discovered a species­rich Neo­ cal Region (A.F. Newton, unpublished database). Among tropical clade within the world Philonthina whose further them, 17 genera and about 180 species are known ex­ exploration seems very promising for understanding the clusively from the Neotropics (CHANI-POSSE 2014a; A.F. unique Neotropical biota. Still, species­rich genera like Newton, unpublished database). The great majority of Philonthus, Belonuchus, or Paederomimus are poorly de­ these Neotropical genera and species are poorly known fined and numerous more diagnosable but mainly mono­ taxa that have never been revised after their outdated typic genera are likely nested within the former large original descriptions from late 19th or early 20th centu­ genera. Their generic limits and sister group relationships ISSN 1863-7221 (print) | eISSN 1864-8312 (online) 83 Chani-Posse & Solodovnikov: Revision of Linoderus and Odontolinus are mostly unknown and remain as big obstacles to the tomological Collection, Natural History Museum / Bio­ systematic resolution of the Neotropical Philonthina. diversity Research Center, University of Kansas, Law­ The genera Linoderus and Odontolinus, which are the rence, USA (Zachary H. Falin); ZMHB – Museum für subjects of this paper, belong to the recently discovered Naturkunde der Humboldt­Universität, Berlin, Germany Neotropical philonthine clade and represent some of the (Johannes Frisch, Joachim Willers); ZMUC – University mentioned monotypic genera requiring better understand­ of Copenhagen, Zoological Museum, Copenhagen, Den­ ing. SHARP (1885) had erected them for two species from mark (Alexey Solodovnikov, Sree Selvantharan). Panama, Linoderus gracilipes and Odontolinus fasciatus, Beetle specimens were examined using a Leica MZ6 respectively. As it was assumed by SHARP (1885) and con­ dissecting microscope. They were mostly examined as firmed in recent analyses C( HANI-POSSE 2013, 2014b) both pinned dry specimens, but a few were first relaxed in genera are closely related to each other and to the Neo­ warm soapy water, rinsed, disarticulated and examined tropical genera Pescolinus and Neopescolinus. Phyloge­ as wet preparations in glycerin. Techniques for the pre­ netic relationships within this group of genera, however, paration and examination of male and female genitalia appear controversial: Linoderus was sister to the clade follow SMETANA (1982). Photographs were taken using Odontolinus + Pescolinus in CHANI-POSSE (2013), while a digital camera attached to the dissecting microscope. in CHANI-POSSE (2014b) it was sister to Pescolinus, and Line drawings were traced from digital photographs. both together comprised the sister to Odontolinus. That Depositories of type material retain the copyright of the entire generic complex seems to be closely related to the photographs. SEM pictures were obtained by using a species­rich genera Paederomimus Sharp and Belonuchus JSM­6610 system. Measurements (given in millimeters) Nordmann, whose generic limits, in turn, represent an were made with an ocular micrometer. Overall body even bigger problem to solve (CHANI-POSSE 2013). There length was measured from the apex of the labrum to the is broad consensus on the non­monophyly of Belonuchus apex of the abdomen. Other measurements were taken (e.g., LI & ZHOU 2011; CHANI-POSSE 2013; CHANI-POSSE et and abbreviated as follows: HW – head capsule maxi­ al. 2017) and at least some suspicion about Paederomi­ mum width (measured at widest point); HL – length of mus (CHANI-POSSE 2014a). The blurred limits between the head capsule, from anterior margin of frontoclypeus to Neotropical philonthine genera combined with the lack of neck constriction (along midline); Lp2L, Lp3L – length detailed descriptions and illustrations make it difficult or of 2nd or 3rd labial palpomere; PW – pronotum maximum impossible to design badly needed broader phylogenetic width; PL – pronotum length along midline; EL – eye work, or even to progress with taxonomic studies without length (seen from above); TL – temple length (from the making mistakes. For example, a new species of Linoderus posterior margin of the eye to the nuchal groove; seen was recently described from Colombia (LÓPEZ-GARCÍA & from above); NW – neck width; S1 – length of 1st meta­ MÉNDEZ-ROJAS 2014) whose generic assignment appeared tarsomere; S5 – length of 5th metatarsomere (last); EtL – highly doubtful. That doubtful taxon, on the one hand, and elytron length at side (straight line from humerus to apex; new species presumably belonging to Linoderus and Od­ seen from above); Etl – elytron length along suture. ontolinus discovered in collections, triggered this paper. Terminology follows authors and criteria as stated in Our objectives are to conduct a cladistic analysis de­ CHANI-POSSE (2014b). Biogeographical provinces consid­ fining the limits of both Linoderus and Odontolinus and ered in the geographical distribution of the species fol­ to justify generic assignments of their previously de­ low the most recent regionalization of MORRONE (2014). scribed and new species. Also we aim to further assess All records and the general distribution given for each their sister group relationships and provide a comprehen­ species are based strictly on examined specimens. Hand­ sive taxonomic revision of all species involved. writing on labels of type specimens was compared to the respective author’s handwriting as shown by HORN et al. (1990). All locality data were recorded from specimen labels, georeferenced by Google Earth (Google Inc.) and plotted onto a relief map derived from a digital elevation 2. Material and methods model using Quantum GIS 2.18.0 (QUANTUM GIS DEVELOP- MENT TEAM 2016). 2.1. Examination of material and terminology 2.2. Phylogenetic analysis The material studied was borrowed from the following 2.2.1. Outgroup and ingroup taxa collections: BMNH – The Natural History Museum, Lon­ don, UK (Roger Booth); FMNH – Field Museum of Nat­ The chosen outgroup taxa include 14 species. One spe­ ural History, Chicago, USA (Alfred F. Newton, Margaret cies, Xanthopygus chapareanus Scheerpeltz, represents K. Thayer); INBio – Instituto Nacional de Biodiversidad, Xanthopygina, a subtribe presumably sister to Philonthi­ San José de Costa Rica (Angel Solís); SEMC – Snow En­ na (BRUNKE et al. 2016; CHANI-POSSE 2013; CHATZIMANO- 84 ARTHROPOD SYSTEMATICS & PHYLOGENY — 75 (1) 2017 LIS 2014) and used here to root the tree. Other
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