Preliminary Contributions Toward a Revision of Greek Messor Forel, 1890 (Hymenoptera: Formicidae)
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Turkish Journal of Zoology Turk J Zool (2019) 43: 52-67 http://journals.tubitak.gov.tr/zoology/ © TÜBİTAK Research Article doi:10.3906/zoo-1809-41 Preliminary contributions toward a revision of Greek Messor Forel, 1890 (Hymenoptera: Formicidae) 1, 2 Sebastian SALATA *, Lech BOROWIEC 1 Institute for Agricultural and Forest Environment, Polish Academy of Sciences, Poznań, Poland 2 Department of Biodiversity and Evolutionary Taxonomy, University of Wrocław, Wrocław, Poland Received: 26.09.2018 Accepted/Published Online: 28.11.2018 Final Version: 11.01.2019 Abstract: Based on recently collected material and study on type specimens Messor carpathous Menozzi, 1936 n. stat. and Messor concolor Santschi, 1927 n. stat. are raised to species rank and redescribed. Messor creticus sp. nov. is described as a new endemic species to Crete. Revised data for members of the Messor structor complexes are given and updated checklist of Greek Messor taxa is provided. Key words: Formicidae, Messor, Greece, endemic species, Mediterranean 1. Introduction groups since it should be preceded by studies focused on Messor Forel, 1890 is a moderately large genus counting easily distinguished taxa. The aim of this research was to more than 150 taxa (Bolton, 2018) spread in the Palearctic, clarify the status of some species and allow to determine Afrotropical, and Oriental regions. Approximately 85 taxa their intraspecific variability. of this genus are known from the Mediterranean subregion During our fieldwork, we collected samples of various (Borowiec, 2014). Its species are granivorous and play Messor morphotypes from localities spread on almost an important role in seeds dispersal. Most of species are the whole Greek territory (Borowiec and Salata, 2012, reported from open and arid habitats, such as savannahs, 2013, 2014, 2017a, 2017b, 2018a, 2018b, 2018c; Bračko et grasslands, phryganas, semideserts, and deserts (Bolton, al., 2016). The collected material allowed us to estimate 1982). the morphological variability of some enigmatic Messor Workers of the genus Messor are polymorphic and very species: M. concolor endemic to Crete and M. carpathous often shape of head, its sculpture cover and intensity, and endemic to Karpathos Island. Additionally, we found in shape of propodeal convexity depend on the size of the material from Crete a species new to science: M. creticus specimen. Minor workers have usually sculpture weaker sp. nov., the only known member of the M. caducus group or, in some cases, even absent and propodeum more or from this region. less rounded without special angulations or denticles, Below we describe Messor creticus sp. nov. and, based on while major workers of the same species can bear very type specimens and freshly collected material, redescribe dense and robust sculpture and often distinct propodeal M. concolor and M. carpathous. We also reexamine Greek angulations or denticles (Steiner et al., 2018). Thus this samples of taxa belonging to the recently revised M. genus is considered to be one of the most taxonomically structor group (Steiner et al., 2018) and list its five members challenging genera. Additionally, many of Mediterranean with assigned distribution data. In the discussion section, Messor taxa have been proposed as intraspecific names we provide also a revised checklist of Greek Messor taxa of various ranks, partly available to nomenclature, which known from this country. Data provided in this work impedes certain estimation of diversity of this genus in this comprise the first stage in our attempt to organize and region. estimate the real level of diversity of Greek Messor species. So far, only members of the Messor structor group have been included in modern revision (Steiner et al., 2018) and 2. Materials and methods knowledge on Greek and East Mediterranean members of Most of the material was sampled between 2007 and this genus is in the preliminary stage. The current state of 2018 from sites in different parts of Greece. The main cognition is unable to perform revisions of the species- method was direct sampling (hand collecting). Individual * Correspondence: [email protected] 52 This work is licensed under a Creative Commons Attribution 4.0 International License. SALATA and BOROWIEC / Turk J Zool specimens and nests were collected on the ground, in leaf EW – eye width; measured along the maximum litter and rock rubble, under stones and tree trunks. This horizontal diameter of eye; method was occasionally supplemented by litter sifting HL – head length; measured in straight line from mid- and collecting material with an entomological umbrella. point of anterior clypeal margin to midpoint of posterior All specimens were preserved in 75% EtOH. This study margin in full-face view; was supported with material deposited in the National HW – head width; measured in full-face view directly History Museum of Crete, Heraklion. All studied type above the eyes; specimens of taxa mentioned in differential diagnosis or ML – mesosoma length; measured as diagonal length characteristics are listed below. Examined specimens are from the anterior end of the neck shield to the posterior housed in the following collections: margin of the propodeal lobe; BMNH – Natural History Museum, London; PEH – petiole height; maximum height of petiole in DBET – Department of Biodiversity and Evolutionary lateral view; Taxonomy, University of Wrocław, Poland; PEL – petiole length; maximum length of petiole in DSAB – Dipartimento di Scienze Agrarie, Universita lateral view; di Bologna, Bologna, Italy; PNW – pronotum width; maximum width of pronotum MHNG – Museum d’Historie Naturelle, Geneve, in dorsal view; Switzerland; PPH – postpetiole height; maximum height of MNHN – Muséum National d’Histoire Naturelle, postpetiole in lateral view; Paris; PPL – postpetiole length; maximum length of MSNG – Museo Civico di Storia Naturale, Genova, postpetiole in lateral view; Italy; PPW – postpetiole width; maximum width of NHMB – Naturhistorisches Museum Basel, postpetiole in dorsal view; Switzerland; PSL – propodeal spine length; measured from the NHMC – Natural History Museum of Crete, Heraklion, center of the propodeal spiracle to the top of the propodeal Greece; spine in lateral view; SSC – Sebastian Salata collection; PW – petiole width; maximum width of petiole in USMB – Upper Silesian Museum, Bytom, Poland. dorsal view; To determine a distribution range and a morphological SDL – spiracle to declivity length; minimum distance variability of new and redescribed species, we compared from the center of the propodeal spiracle to the propodeal them with material collected from other Greek regions. declivity; Data concerning samples used in the comparison and records provided in the revised distribution data of the SL – scape length; maximum straight-line length of M. structor members is provided in series of regional scape. checklists (Borowiec and Salata, 2012, 2013, 2014, 2017a, Indices 2017b, 2018a, 2018b, 2018c; Bračko et al., 2016). HI: HW/HL * 100; Specimens were compared using standard methods SI1: SL/HL * 100; of comparative morphology. Photos were taken using a SI2: SL/HW * 100; Nikon SMZ 1500 stereomicroscope, Nikon D5200 photo MI: PNW/ML * 100; camera and Helicon Focus software. All given label data EI1: EW/EL * 100; are in original spelling, presented in square brackets; a EI2: EW/HL * 100; vertical bar (|) separates data in different rows and double PI: PL/PH * 100; vertical bars (||) separate labels. Images of type specimens PPI: PPL/PPH * 100; are available online on AntWeb (www.antweb.org) and are PSI: PSL/SDL * 100. accessible using the unique CASENT identifying specimen Abbreviations code. q. – gyne; w. – worker. Pilosity inclination degree applies to this used in Examined type material of species mentioned in Hölldobler and Wilson (1990). The adpressed (0°–5°) differential diagnosis hairs run parallel or nearly parallel to the body surface. Messor alexandri Tohmé & Tohmé, 1981, syntype (w.): Decumbent hairs stand 10°–15°, subdecumbent hair M. barbarus | sub. structor | v. alexandri | type | Santschi || stands 30°, suberect hairs stand 35°–45°, and the erect Type || Sammlung | Dr. F. Santschi | Kairouan || Asi Minor hairs stand more than 45° from the body surface. | Alexandretti || ANTWEB | CASENT0913151 (NHMB); Measurements Messor hellenius Agosti & Collingwood, 1987, EL – eye length; measured along the maximum vertical syntype (w.): v. hellenius | Santschi || [red label] || type diameter of eye; || Messor | structor Lat. | varrialei Em || MUSEUM 53 SALATA and BOROWIEC / Turk J Zool PARIS | SALONIQUE | D’RIVET 1918 || NOVEMBRE lobe-shaped projections, with blunt, rounded, and || Sammlung | Dr. F. Santschi | Kairouan || ANTWEB | directed outwards tips. Messor carpathous can be also CASENT0913186 (NHMB); confused with M. hellenius Agosti & Collingwood, 1987 Messor ebeninus Santschi, 1927, syntype (w.): Messor | and some taxa of the M. structor group. It differs from barbarus L. | subsp. semirufus Andr. | v. ebenina | type | M. hellenius in lack of psammophores; from M. muticus Forel || Typus || Djebel Kasioun | Antiliban (Kerville) || (Nylander, 1849) in lack of abundant standing setae on Coll. | A. Forel || ANTWEB | CASENT0907734 (MHNG); side of head and presence of lobe-shaped projections on Messor intermedius Santschi, 1927, syntype (w.): Messor propodeum; from M. mcarthuri Steiner et al., 2018 and | barbarus | subsp. semirufus | Andr. | v. intermedia | type M. varrialei Emery, 1921 in presence of lobe at the base of | For || Typus