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cranial differences in three-toed jerboas(Dipodinae,Dipodidae,Rodentia)according to recent taxonomic revisions

Current Zoology 2023年第4期69卷 475-490页

作者： Bader H.Alhajeri Zahraa Hasan Hasan Alhaddad Department of Biological Sciences Kuwait UniversitySafat13060Kuwait

Recent phylogenetic studies amended the taxonomy of three-toed jerboas(subfamily Dipodinae),including raising subspecies to full species.Here,we use geometric morphometrics to compare scaled-shape differences in dipodine crania while considering their revised taxonomy.We sampled Dipus deasyi,D.sagitta halli,D.s.sowerbyi,Jaculus blanfordi blanfordi,J.hirtipes,J.jaculus,J.loftusi,J.orientalis gerboa,J.o.mauritanicus,and Stylodipus andrewsi.crania were not sexually dimorphic.Common allometry explained some of the shape variation,for example,reduced braincases in larger specimens.Most operational taxonomic unit pairs differed in both size and shape.Dipus and Stylodipus clustered together based on their cranial shape.Jaculus differed from the aforementioned genera by its larger tympanic bulla,broader braincase,larger infraorbital foramen,along with reduced molars and rostra.Jaculus orientalis differed from other Jaculus by its broader face versus reduced cranial vault.Jaculus blanfordi(subgenus Haltomys)resembles members of the subgenus Jaculus more than its consubgener(J.orientalis).Jaculus loftusi,previously considered a synonym of J.jaculus,clearly differed from the latter by its shorter rostrum,smaller infraorbital foramen,and more caudolaterally expanded tympanic bulla.Jaculus hirtipes,another recent synonym of J.jaculus,resembled J.blanfordi more in scaled cranial shape than it did J.jaculus.Dipus sagitta halli and D.s.sowerbyi were indistinguishable,but they clearly differed from D.deasyi(recently raised to full species)with the latter having a larger molar row,more inflated tympanic bulla,and shorter,slenderer rostrum.Ecological explanations for detected cranial shape differences are considered,including diet and habitat(particularly substrate).

关键词： crania Dipus deasyi Jaculus hirtipes Jaculus loftusi jerboa Stylodipus andrewsi

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