caa a22 4500 477136680 CHVBK 20180405111720.0 cr unu---uuuuu 170330e19970301xx s 000 0 eng 10.1023/A:1027379610196 doi (NATIONALLICENCE)springer-10.1023/A:1027379610196 Wroe Stephen Palaeontology Laboratory, School of Biological Sciences, University of New South Wales, 2052, Sydney, N.S.W., Australia aut A Reexamination of Proposed Morphology-Based Synapomorphies for the Families of Dasyuromorphia (Marsupialia). I. Dasyuridae [Elektronische Daten] [Stephen Wroe] The validity of eight morphological features previously advanced as synapomorphic for Dasyuridae is investigated in the light of new fossil and molecular data. Results indicate that one of these features (alisphenoid-periotic enclosure of the foramen ovale) is common to outgroups for Dasyuromorphia. Another feature (loss of intestinal cecum) is a likely synapomorphy for Dasyuromorphia. Two features (development of a hypoconulid notch, enlargement of stylar cusp D) may represent shared-derived characters within Dasyuromorphia but not at the family level for Dasyuridae (i.e., probably unite Dasyuridae-Thylacinidae). Another two features (loss of posterolateral palatine foramina, reduction of P3) are also apomorphic within Dasyuromorphia but unite specialized clades within Dasyuridae. Only two previously treated features are probable synapomorphies for the family (enlargement of the alisphenoid tympanic wing and development of a distinct periotic hypotympanic sinus). An additional feature is identified as a dasyurid synapomorphy (presence of a distinct tubal foramen). Of all putative synapomorphies proposed to date, only the presence of a periotic hypotympanic sinus and tubal foramen are unique for Dasyuridae among dasyuromorphians. Results suggest considerable homoplasy for basicranial features within Dasyuromorphia. Independent acquisition for alisphenoid enclosure of the foramen ovale, development of secondary foramina ovale and loss of posterolateral palatal foramina has occurred in derived thylacinid and dasyurid clades. Convergence is also indicated for hypertrophy of the alisphenoid tympanic wing shown for dasyurids and myrmecobiids, and the development of a squamosal epitympanic sinus in Thylacinidae, Dasyuridae, and Myrmecobiidae. The finding of plesiomorphy for alisphenoid-periotic enclosure of the foramen ovale within Dasyuromorphia undermines the strongest morphology-based synapomorphy uniting a monophyletic Dasyuridae-Myrmecobiidae. Phylogenetic placement for some plesiomorphic fossil dasyuromorphians, known only from dental material, within Dasyuridae is currently untenable, with no dental synapomorphies uniting the family. The value of identifying morphoclines within clades known from robust phylogenetic data for consideration in character analysis is stressed, as is the importance of form-function and ontogenetic data. Plenum Publishing Corporation, 1997 Dasyuromorphia nationallicence Dasyuridae nationallicence character analysis nationallicence form-function nationallicence homoplasy nationallicence Journal of Mammalian Evolution Kluwer Academic Publishers-Plenum Publishers 4/1(1997-03-01), 19-52 1064-7554 4:1<19 1997 4 10914 https://doi.org/10.1023/A:1027379610196 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1027379610196 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wroe Stephen Palaeontology Laboratory, School of Biological Sciences, University of New South Wales, 2052, Sydney, N.S.W., Australia aut NATIONALLICENCE 773 0- Journal of Mammalian Evolution Kluwer Academic Publishers-Plenum Publishers 4/1(1997-03-01), 19-52 1064-7554 4:1<19 1997 4 10914 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 256555680 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer