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[Submitted to the Journal Papers in Palaeontology in July 29, 2019] bioRxiv preprint doi: https://doi.org/10.1101/719153; this version posted October 9, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 [Submitted to the journal Papers in Palaeontology in july 29, 2019] 2 3 SYSTEMATIC REVISION AND REDEFINITION OF THE GENUS SCIRROTHERIUM 4 EDMUND & THEODOR, 1997 (CINGULATA, PAMPATHERIIDAE): IMPLICATIONS 5 FOR THE ORIGIN OF PAMPATHERIIDS AND THE EVOLUTION OF THE SOUTH 6 AMERICAN LINEAGE INCLUDING HOLMESINA 7 8 By KEVIN JIMÉNEZ-LARA1,2 9 1 División de Paleontología de Vertebrados, Museo de La Plata, Facultad de Ciencias 10 Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque s/n, B1900FWA 11 La Plata, Argentina. 12 2CONICET, Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina. 13 e-mail: [email protected] 14 15 Abstract: The intrageneric relationships of the pampatheriid genus Scirrotherium and its 16 affinities with supposedly related genera, i.e. Kraglievichia and Holmesina, are revised 17 through parsimony phylogenetic analyses and new comparative morphological 18 descriptions. For this work was analyzed unpublished material of pampatheriids (numerous 19 osteoderms, one partial skull and a few postcranial bones) from Neogene formations of 20 Colombia. The results show that Scirrotherium is paraphyletic if we include all its referred 21 species, i.e. Scirrotherium hondaensis, S. carinatum and S. antelucanus. The species S. bioRxiv preprint doi: https://doi.org/10.1101/719153; this version posted October 9, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 22 carinatum is closer to Kraglievichia paranensis than to S. hondaensis or S. antelucanus, 23 then it is proposed the new name K. carinatum comb. nov. The relationships between S. 24 hondaensis and S. antelucanus could not be resolved, so these species should be designated 25 in aphyly. In spite of failing to recover S. hondaensis and S. antelucanus as one single 26 clade, here is preferred to maintain the generic name Scirrotherium in both species from 27 diagnostic evidence. New emended diagnoses for Scirrotherium, S. hondaensis and 28 Kraglievichia are provided. The genus Holmesina was found monophyletic and located as 29 the sister clade of Scirrotherium + Kraglievichia. The evolutionary and biogeographical 30 implications of the new phylogeny and taxonomical re-arrangements are discussed. It is 31 claimed a possible geographical origin of the family Pampatheriidae and Scirrotherium in 32 low latitudes of South America as early as Early Miocene (Burdigalian) times. The South 33 American ancestor or sister taxon of Holmesina is predicted as morphologically more 34 similar to Scirrotherium than to Kraglievichia. 35 Key words: Pampatheriidae, Scirrotherium, Kraglievichia, Holmesina, Great American 36 Biotic Interchange, Neogene. 37 38 The pampatheriids (Pampatheriidae) are a morphologically conservative extinct clade of 39 glyptodontoid cingulates or highly armored xenartrans (Glyptodontoidea sensu McKenna & 40 Bell 1997) with medium-to-large body sizes (Edmund 1985; Góis et al. 2013). They were 41 distributed from the Neogene to the Early Holocene in numerous localities of South 42 America (their native range), Central America, Mexico and the United States (Edmund 43 1985; Vizcaíno et al. 1998; Rincón et al. 2014; Góis et al. 2015 and references there). As 44 the modern armadillos (Dasypodidae), pampatheriids have a flexible carapace by the bioRxiv preprint doi: https://doi.org/10.1101/719153; this version posted October 9, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 45 presence of three transverse bands of imbricated osteoderms which conform a kind of 46 “articulation” between the scapular and pelvic shields (Edmund 1985). The pampatheriids 47 also have multiple features, especially in their skull and mandible, which, collectively, 48 define them as the sister group of glyptodontids –Glyptodontidae (Gaudin 2004; Gaudin & 49 Wible 2006; Billet et al. 2011; Delsuc et al. 2012), namely deep horizontal mandibular 50 ramus, laterally-directed zygomatic root, transversely-wide glenoid fossa, rough pterygoids, 51 among others (Gaudin & Wible, 2006). 52 The fossil record of Pampatheriidae is mainly represented by isolated specimens, of which 53 most of them are osteoderms and, in lesser extent, skulls, mandibles and postcranial bones; 54 fairly complete and articulated skeletons are uncommon (Edmund 1985; Góis 2013). Due 55 the above, the systematics of this xenartran group has historically been based on 56 osteodermal characters (Edmund 1985, 1987; Góis et al. 2013), as has been the case with 57 other cingulate clades. Overall, nearly two tens of pampatheriid species and seven genera 58 are known (Góis 2013). The latter conform two possible subfamilial lineages: (1) that 59 including to the genera Plaina and Pampatherium; and (2) that comprising the genera 60 Scirrotherium, Kraglievichia and Holmesina (Edmund 1985). However, it does not exist in 61 the scientific literature a published phylogenetic analysis on the relationships between the 62 different pampatheriid genera. Only Góis (2013) performed a phylogenetic analysis for 63 these taxa, but his results have not been published. In Góis’s consensus tree, it was 64 corroborated the hypothesis by Edmund (1985) on the two subfamilial lineages. 65 The genus Scirrotherium is the oldest known pampatheriid in the fossil record (Góis et al. 66 2013; Rincón et al. 2014) and one of the four Miocene genera (the other ones are 67 Kraglievichia Castellanos 1927; Vassallia Castellanos, 1927; and Plaina Castellanos, bioRxiv preprint doi: https://doi.org/10.1101/719153; this version posted October 9, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 68 1937). This taxon was originally described by Edmund & Theodor (1997) from 69 craniomandibular, postcranial and osteodermal specimens collected in the Middle Miocene 70 (Serravalian) sedimentary sequence of the La Venta area, southwestern Colombia. These 71 authors interpreted that the only known species in that time and type species, Scirrotherium 72 hondaensis, has plesiomorphic traits in its osteological morphology which are expected for 73 its antiquity. Additionally, they highlighted morphological similarity of S. hondaensis with 74 the species Vassallia minuta (Late Miocene of southern and central South America; De 75 Iullis & Edmund 2002), more than with any other pampatheriid. 76 Later, Góis et al. (2013) described a second species for Scirrotherium, S. carinatum, from 77 the Late Miocene (Tortonian) of northeastern and southern of Argentina-northwestern 78 Brazil. In northeastern Argentina (Entre Ríos Province), S. carinatum shares basal 79 stratigraphic levels (“Conglomerado Osífero”, literally ‘bone-bearing conglomerate’) in the 80 Ituzaingó Formation with the middle-sized pampatheriid Kraglievichia paranensis (Góis et 81 al. 2013; Scillato-Yané et al. 2013), a taxon different but not distantly related to 82 Scirrotherium as previously indicated. The species S. carinatum, based exclusively on 83 osteoderms of different regions of the armored carapace, has a body size comparable or 84 slightly smaller than that of S. hondaensis (Góis et al. 2013). 85 The phylogenetic analysis conducted by Góis (2013) recovered in polytomy to S. carinatum 86 and S. hondaensis, being one of these species or both of them the sister taxon/taxa of the 87 clade Kraglievichia + Holmesina (except H. floridanus). It is notorious the non-basal 88 position of the Scirrotherium species within the general topology of the cladogram despite 89 they conform the oldest known genus. Instead, these species are closely placed to widely 90 recognized terminal taxa, i.e. Holmesina spp. (Edmund 1985, 1987; Gaudin & Lyon 2017). bioRxiv preprint doi: https://doi.org/10.1101/719153; this version posted October 9, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 91 If this result is correct, it would indicate a significantly long ghost lineage at the base of the 92 evolutionary tree of Pampatheriidae. 93 Góis found phylogenetic support for Scirrotherium through one single synapomorphy, i.e. 94 presence of deep longitudinal depressions (LDs) in osteoderms. This is a distinctive feature 95 of S. carinatum but, in contrast, the LDs in S. hondaensis are relatively shallow, rather than 96 deep. Interestingly, this putative synapomorphy is actually shared by K. paranensis. Góis 97 explained the insufficient phylogenetic resolution in his analysis for Scirrotherium using 98 the argument of fragmentary character of the fossil specimens of S. hondaensis, although in 99
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