Molecular Phylogeny and Systematics of Dipodoidea: a Test of Morphology-Based Hypotheses
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Zoologica Scripta Molecular phylogeny and systematics of Dipodoidea: a test of morphology-based hypotheses VLADIMIR S. LEBEDEV,ANNA A. BANNIKOVA,MARIE PAGE` S,JULIE PISANO,JOHAN R. MICHAUX & GEORGY I. SHENBROT Submitted: 5 February 2012 Lebedev, V.S., Bannikova, A.A., Page`s, M., Pisano, J., Michaux, J.R. & Shenbrot, G.I. Accepted: 18 October 2012 (2012). Molecular phylogeny and systematics of Dipodoidea: a test of morphology-based doi:10.1111/zsc.12002 hypotheses. —Zoologica Scripta, 00, 000–000. The superfamily Dipodoidea (Rodentia, Myomorpha) in its current interpretation contains a single family subdivided into six subfamilies. Four of them include morphologically spe- cialized bipedal arid-dwelling jerboas (Dipodinae – three-toed jerboas, Allactaginae – five- toed jerboas, Cardiocraniinae – pygmy jerboas and Euchoreutinae – long-eared jerboas), the other two are represented by more generalized quadrupedal taxa (Zapodinae – jumping mice and Sminthinae – birch mice). Despite considerable effort from morphologists, the taxonomy as well as the phylogeny of the Dipodoidea remains controversial. Strikingly, molecular approach has never been envisaged to investigate these questions. In this study, the phylogenetic relationships among the main dipodoid lineages were reconstructed for the first time using DNA sequence data from four nuclear genes (IRBP, GHR, BRCA1, RAG1). No evidence of conflict among genes was revealed. The same robustly supported tree topology was inferred from the concatenated alignment whatever the phylogenetic methods used (maximum parsimony, maximum-likelihood and Bayesian phylogenetic methods). Sminthinae branches basally within the dipodoids followed by Zapodinae. Monophyletic Cardiocraniinae is sister to all other jerboas. Within the latter, the mono- phyly of both Dipodinae and Allactaginae is highly supported. The relationships between Dipodinae, Allactaginae and Euchoreutinae should be regarded as unresolved trichotomy. Morphological hypotheses were confronted to findings based on the presented molecular data. As a result, previously proposed sister group relationships between Euchoreutes and Sicista, Paradipus and Cardiocraniinae as well as the monophyly of Cardiocaniinae + Dipo- dinae were rejected. However, the latter association is consistently supported by most mor- phological analyses. The basis of the obvious conflict between genes and morphology remains unclear. Suggested modifications to the taxonomy of Dipodoidea imply recogni- tion of three families: Sminthidae, Zapodidae and Dipodidae, the latter including Cardioc- raniinae, Euchoreutinae, Allactaginae and Dipodinae as subfamilies. Corresponding author: Vladimir S. Lebedev, Zoological Museum, Moscow State University, B.Nikitskaya 6, 125009 Moscow. E-mail: [email protected]. Anna A. Bannikova, Lomonosov Moscow State University, Vorobievy Gory, 119992 Moscow, Russia. E-mail: [email protected] Marie Page`s, INRA, UMR CBGP (INRA ⁄ IRD ⁄ Cirad ⁄ Montpellier SupAgro), Campus Interna- tional de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez cedex, France; Laboratoire de ge´ne´- tique des microorganismes, Institut de Botanique, Universite´ de Lie`ge, 4000 Lie`ge (Sart Tilman), Belgique. E-mail: [email protected] Julie Pisano, INRA, UMR CBGP (INRA ⁄ IRD ⁄ Cirad ⁄ Montpellier SupAgro), Campus Interna- tional de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez cedex, France; Laboratoire de ge´ne´- tique des microorganismes, Institut de Botanique, Universite´ de Lie`ge, 4000 Lie`ge (Sart Tilman), Belgique. E-mail: [email protected] Johan R. Michaux, INRA, UMR CBGP (INRA ⁄ IRD ⁄ Cirad ⁄ Montpellier SupAgro), Campus International de Baillarguet, CS 30016, 34988 Montferrier-sur-Lez cedex, France; Laboratoire de ge´ne´tique des microorganismes, Institut de Botanique, Universite´ de Lie`ge, 4000 Lie`ge (Sart Tilman), Belgique. E-mail: [email protected] ª 2012 The Authors d Zoologica Scripta ª 2012 The Norwegian Academy of Science and Letters 1 Molecular phylogeny of Dipodoidea d V. S. Lebedev et al. Georgy I. Shenbrot, Mitrani Department of Desert Ecology, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, 84990 Midreshet Ben-Gurion, Israel. E-mail: [email protected] Introduction should be placed in a single family (Vinogradov 1930, The superfamily of Dipodoidea is the sister group of 1937; Ellerman 1940; Ognev 1948; Klingener 1984; Hol- Muroidea based either on current molecular (e.g. Michaux den & Musser 2005). The rationale for this approach rests & Catzeflis 2000; Huchon et al. 2002; DeBry 2003; Adkins on the observation that bipedal Euchoreutinae and Cardi- et al. 2003; Montgelard et al. 2008; Blanga-Kanfi et al. ocraniinae share with Zapodinae and Sminthinae a number 2009; Churakov et al. 2010) or on morphological (e.g. of unspecialized skeletal features (Vinogradov 1930, 1937). Klingener 1964) data. Compared with the latter taxon, Based on equivocal and possibly intermediate position of which is the most diverse group of mammals – no less Euchoreutinae and Cardiocraniinae, it was concluded that than 6 families, 310 genera and more than 1518 species simple dichotomy between bipedal and non-bipedal taxa is (Musser & Carleton 2005) – the diversity of dipodoids inadequate to accommodate significant morphological var- appears relatively modest – just 16 genera and 51 species iation within the superfamily. The point is illustrated by (Holden & Musser 2005). However, the Dipodoidea dem- an informal morphological phylogenetic tree of Vinogra- onstrate diverse ecological and morphological adaptations dov (1937), which supported a basal position of Zapodinae ranging from the forest- and meadow-dwelling mouse-like (here including also Sicista) with Cardiocraniinae and Eu- birch mice and jumping mice to the arid-dwelling saltato- choreutes branching deeper than Allactaginae and Dipodi- rial jerboas, which exhibit the most extreme specializations nae (Fig. 1). for bipedal locomotion among rodents (Fokin 1978). A different taxonomic arrangement (Dipodidae, Zapodi- Although the superfamily has received much taxonomic dae, Sminthidae as separate families) was proposed based attention (see bellow), its classification remains controver- on chromosome data (Vorontsov et al. 1971). Zapodidae sial. (Fig. 1). Most researchers (e.g. Holden & Musser were considered karyotypically primitive as compared to 2005) agree that dipodoids can be arranged into six major jerboas and birch mice. No evident karyological similarity groups, which are usually assigned to subfamilial rank. between any two of these well-defined groups could be These groups are as follows: Dipodinae (three-toed jer- traced. boas – five genera), Allactaginae (five-toed jerboas – three The first explicitly phylogenetic system of the superfam- genera), Cardiocraniinae (pygmy jerboas – two genera), ily (Stein 1990) recognized only two families, Sicistidae Euchoreutinae (long-eared jerboas – one genus), Zapodi- (=Sminthidae) and Dipodidae, the latter including also nae (jumping mice – three genera) and Sminthinae (syno- Zapodinae. Contrary to Vinogradov’s pattern, Cardiocra- nym Sicistinae, birch mice – one genus). niinae is placed sister to the Dipodinae. This study was In contrast, family-level classification has long been a primarily based on cladistic analysis of limb myology. matter of debate, the number of recognized families rang- To a large extent, the above morphology-based systems ing from one to five. This lack of consensus on dipodoid reflect the evolution of locomotory adaptations, with sub- taxonomy is, to a large extent, accounted for by the fact families (or families) corresponding to grades of evolution- that phylogenetic relationships among the main lineages ary development from primitive quadrupedal to specialized have not been unambiguously established yet. bipedal locomotion. The least advanced stage is repre- Some of the early precladistic classifications contrasted sented by birch mice (strictly quadrupedal, non-leaping) the bipedal arid-dwelling true jerboas (Dipodinae, Allacta- followed by jumping mice (predominantly quadrupedal ginae, Cardiocraniinae and Euchoreutinae) to the forest but capable of making long leaps; hind foot elongated). All and grassland quadrupedal birch mice (Sminthinae) and strictly bipedal forms (jerboas) show important modifica- jumping mice (Zapodinae) considering these two groups as tions of hindlimb skeletal and muscular morphology (see separate families: the Dipodidae and the Zapodidae (Miller Fokin 1978 for a review). Among jerboa sufamilies, the & Gidley 1918; Vinogradov 1925; Simpson 1945). Obvi- highest degree of morphological specializations is achieved ously, the latter family was based upon plesiomorphic sim- in fast-running allactagines and dipodines (maximum speed ilarity between the two quadrupedal lineages and was approximately 5.1–11.9 m ⁄ s), whereas the lowest is found never formally supported on phylogenetic grounds. in cardiocraniines (maximum speed <2.5 m ⁄ s; antipredator According to the alternative view, all dipodoid groups response is freezing rather than fleeing) (Fokin 1978). The 2 ª 2012 The Authors d Zoologica Scripta ª 2012 The Norwegian Academy of Science and Letters V. S. Lebedev et al. d Molecular phylogeny of Dipodoidea Fig. 1 Graphic representation of previously suggested taxonomic systems and phylogenetic patterns in Dipodoidea. ª 2012 The Authors d Zoologica Scripta ª 2012 The Norwegian Academy of Science and Letters 3 Molecular phylogeny of Dipodoidea d V. S. Lebedev et al.