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A New Genus of Rodent from Wallacea (Rodentia: Muridae: Murinae: Rattini), and Its Implication for Biogeography and Indo-Pacific

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A New Genus of Rodent from Wallacea (Rodentia: Muridae: Murinae: Rattini), and Its Implication for Biogeography and Indo-Pacific bs_bs_banner Zoological Journal of the Linnean Society, 2013, 169, 408–447. With 10 figures A new genus of rodent from Wallacea (Rodentia: Muridae: Murinae: Rattini), and its implication for biogeography and Indo-Pacific Rattini systematics PIERRE-HENRI FABRE1*, MARIE PAGÈS2,3, GUY G. MUSSER4†, YULI S. FITRIANA5, JON FJELDSÅ1, ANDY JENNINGS6, KNUD A. JØNSSON1, JONATHAN KENNEDY1, JOHAN MICHAUX3, GONO SEMIADI5, NANANG SUPRIATNA5 and KRISTOFER M. HELGEN7 1Center for Macroecology, Evolution and Climate (CMEC, Department of Biology), Zoological Museum, University of Copenhagen, Universitetsparken 15, DK-2100 Copenhagen, Denmark 2Laboratoire de génétique des microorganismes, Université de Liège, 4000 Liège, Belgique 3INRA, UMR CBGP (INRA/IRD/Cirad/Montpellier SupAgro), Campus International de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez Cedex, France 4Division of Vertebrate Zoology (Mammalogy), American Museum of Natural History, New York, NY 10024, USA 5Museum Zoologicum Bogoriense, Research Center For Biology, Indonesian Institute of Sciences (LIPI), Jl.Raya Jakarta-Bogor Km.46 Cibinong 16911 Indonesia 6Muséum National d’Histoire Naturelle, Département Systématique et Evolution CP 51, 57 Rue Cuvier, 75231 Paris, France 7National Museum of Natural History, Smithsonian. Institution, P.O. Box 37012, MRC 108, Washington, DC 20013-7012, USA Received 31 January 2013; revised 4 June 2013; accepted for publication 6 June 2013 We describe Halmaheramys bokimekot Fabre, Pagès, Musser, Fitriana, Semiadi & Helgen gen. et sp. nov.,a new genus and species of murine rodent from the North Moluccas, and study its phylogenetic placement using both molecular and morphological data. We generated a densely sampled mitochondrial and nuclear DNA data set that included most genera of Indo-Pacific Murinae, and used probabilistic methodologies to infer their phylogenetic relationships. To reconstruct their biogeographical history, we first dated the topology and then used a Lagrange analysis to infer ancestral geographic areas. Finally, we combined the ancestral area reconstructions with temporal information to compare patterns of murine colonization among Indo-Pacific archipelagos. We provide a new and comprehensive molecular phylogenetic reconstruction for Indo-Pacific Murinae, with a focus on the Rattus division. Using previous results and those presented in this study, we define a new Indo-Pacific group within the Rattus division, composed of Bullimus, Bunomys, Paruromys, Halmaheramys, Sundamys, and Taeromys. Our phylogenetic reconstructions revealed a relatively recent diversification from the Middle Miocene to Plio-Pleistocene associated with several major dispersal events. We identified two independent Indo-Pacific dispersal events from both western and eastern Indo-Pacific archipelagos to the isolated island of Halmahera, which led to the speciations of H. bokimekot gen. et sp. nov. and Rattus morotaiensis Kellogg, 1945. We propose that a Middle Miocene collision between the Halmahera and Sangihe arcs may have been responsible for the arrival of the ancestor of Halmaheramys to eastern Wallacea. Halmaheramys bokimekot gen. et sp. nov. is described in detail, and its systematics and biogeography are documented and illustrated. © 2013 The Linnean Society of London, Zoological Journal of the Linnean Society, 2013, 169, 408–447. doi: 10.1111/zoj.12061 ADDITIONAL KEYWORDS: biodiversity – biogeography – Indo-Pacific – molecular systematics – morphology – Rattini – Wallacea. *Corresponding author. E-mail: [email protected] †Current address: 494 Wallace Drive, Charleston, SC 29412, USA. 408 © 2013 The Linnean Society of London, Zoological Journal of the Linnean Society, 2013, 169, 408–447 HALMAHERAMYS, A NEW WALLACEAN RODENT GENUS 409 INTRODUCTION The most diverse terrestrial group of mammals within the Indo-Pacific region are rodents of the sub- With more than 20 000 islands, ranging from small family Murinae, represented by 368 extant species atolls to large tropical islands, the Indo-Pacific con- (Musser & Carleton, 2005; Aplin & Helgen, 2010). stitutes one of the most biotically important and They mainly comprise three tribes (Lecompte et al., geologically complex regions on the planet (Lohman 2008; Rowe et al., 2008; Aplin & Helgen, 2010): the et al., 2011). Forty-five million years ago, the Phloeomyini (Philippine Old Endemics); the Rattini Australo-Papuan plate began to move northwards, (rats and allies); and the Hydromyini. Both the culminating in a collision with the Asian and Pacific Rattini and Hydromyini have colonized Australia, plates. This period of high tectonic activity (Hall, Melanesia, New Guinea, the Philippines, and Walla- 2002, 2009) led to both the emergence and submer- cea (Fig. 1). Throughout the Indo-Pacific, the complex gence of many islands (Hall, 1996; Hall, Cottam & distribution of the Murinae has been shaped by the Wilson, 2011). During the Plio-Pleistocene climate history of dispersal, involving independent coloniza- oscillations caused continuous sea level fluctuations, tions of different archipelagos (Jansa, Barker & which periodically connected islands, or reduced the Heaney, 2006; Rowe et al., 2008). For example, in the distances between them (Voris, 2000). This dynamic Philippine murine assemblage (Heaney et al., 1998, geological history has resulted in complex patterns 2009; Rickart et al., 2005) at least five independent of spatiotemporal dispersal and vicariance among colonizations from the Asian continent occurred lineages, and has generated a number of alternative during the Neogene (Jansa et al., 2006). Two addi- scenarios of island colonization (Lohman et al., 2011; tional colonizations of Sahul regions (Australia and Stelbrink et al., 2012). New Guinea) led to the respective diversification of Figure 1. Map of the Indo-Pacific Archipelago indicating contemporary islands, straits, seas, arcs, and faunal lines (modified from Lohman et al., 2011). Major islands are labelled; lineages of Murinae present on each island are also labelled; different countries in the Indo-Pacific are indicated by colours (see also Figs 2 and 3). Upper right: map of Halmahera Island, where a white star represents the trapping site of Halmaheramys bokimekot gen. et sp. nov. Maps were extracted and modified from Wikimapia (http://wikimapia.org). © 2013 The Linnean Society of London, Zoological Journal of the Linnean Society, 2013, 169, 408–447 410 P.-H. FABRE ET AL. the Australo-Papuan Hydromyini (Rowe et al., 2008; Recent molecular studies have suggested that the Bryant et al., 2011) and Rattus species (Taylor & centre of diversification for Rattini lies within South/ Horner, 1973; Taylor, Calaby & Van Deusen, 1982; Southeast Asia (Musser & Carleton, 2005; Rowe Robins et al., 2010; Rowe et al., 2011). Despite high et al., 2008), from where they colonized various Indo- murine species richness in Wallacea (more than 50 Pacific islands (Musser, 1981; Musser & Newcomb, species; Musser, 1987), few molecular systematic 1983; Musser & Heaney, 1992). Specifically, mem- analyses have addressed the biogeographic history of bers of the Rattini colonized the Philippines colonization in this region. three times during the Late Miocene (Bullimus, The Rattini is the most diverse tribe of murines Limnomys + Tarsomys + Rattus everetti group, Cru- in Wallacea (with more than 50 Sulawesian species, nomys division; Jansa et al., 2006; Heaney et al., seven Lesser Sundaic species, and five Moluccan 2009), Sulawesi at least three times, also during the species). Systematic revisions continue to reveal over- Miocene (Bunomys and Rattus group in Rattus divi- looked diversity within the Rattini: 45 genera and sion; Maxomys + Crunomys divisions; Melasmothrix 175 species are currently recognized, of which 66 are division; Jansa et al., 2006; Rowe et al., 2008), and assigned to Rattus. The diversity of phenotypes in Sahul once, during the Pliocene (Australo-Papuan the Rattini (Ellerman, 1941, 1949; Misonne, 1969; Rattus; Rowe et al., 2011). Musser & Newcomb, 1983; Musser & Carleton, Using the murine DNA sequences available, we aim 2005), particularly within Rattus (Taylor et al., 1982; to update the current understanding of the systematic Musser & Holden, 1991; Musser & Carleton, 2005), relationships and colonization history of the Rattini represents a major challenge for Indo-Pacific rodent within Wallacea, with a specific focus on the north systematists (Medway & Yong, 1976; Musser, 1987). Moluccas (Fig. 1). To achieve this, we sequenced four Most Rattini species exhibit morphological features Rattini endemic to Sulawesi, one from Halmahera reflecting mosaic convergences and plesiomorphies, (Rattus morotaiensis Kellogg, 1945), and the newly generating considerable uncertainty in morphology- discovered genus and species Halmaheramys bokime- based classifications (Medway & Yong 1976; Musser kot gen. et sp. nov., described here. Using mitochon- & Newcomb, 1983; Musser & Holden, 1991). The drial and nuclear DNA sequences and dense taxon systematic and taxonomic status of several genera sampling, we infer a highly resolved molecular within Rattini has been a topic of much debate, with phylogeny. We subsequently use this phylogeny to many lineages traditionally regarded as part of compute ancestral area reconstructions of the Indo- Rattus now classified as separate genera (for reviews, Pacific Murinae in order to infer both the colonization see Musser & Newcomb 1983; Musser & Carleton, history and patterns of speciation in this group. We 2005). Based on recent molecular phylogenetic aim to address
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