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Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia)
Journal of Mammalian Evolution https://doi.org/10.1007/s10914-019-09462-z ORIGINAL PAPER Evolutionary and Functional Implications of Incisor Enamel Microstructure Diversity in Notoungulata (Placentalia, Mammalia) Andréa Filippo1 & Daniela C. Kalthoff2 & Guillaume Billet1 & Helder Gomes Rodrigues1,3,4 # The Author(s) 2019 Abstract Notoungulates are an extinct clade of South American mammals, comprising a large diversity of body sizes and skeletal morphologies, and including taxa with highly specialized dentitions. The evolutionary history of notoungulates is characterized by numerous dental convergences, such as continuous growth of both molars and incisors, which repeatedly occurred in late- diverging families to counter the effects of abrasion. The main goal of this study is to determine if the acquisition of high-crowned incisors in different notoungulate families was accompanied by significant and repeated changes in their enamel microstructure. More generally, it aims at identifying evolutionary patterns of incisor enamel microstructure in notoungulates. Fifty-eight samples of incisors encompassing 21 genera of notoungulates were sectioned to study the enamel microstructure using a scanning electron microscope. We showed that most Eocene taxa were characterized by an incisor schmelzmuster involving only radial enamel. Interestingly, derived schmelzmusters involving the presence of Hunter-Schreger bands (HSB) and of modified radial enamel occurred in all four late-diverging families, mostly in parallel with morphological specializations, such as crown height increase. Despite a high degree of homoplasy, some characters detected at different levels of enamel complexity (e.g., labial versus lingual sides, upper versus lower incisors) might also be useful for phylogenetic reconstructions. Comparisons with perissodactyls showed that notoungulates paralleled equids in some aspects related to abrasion resistance, in having evolved transverse to oblique HSB combined with modified radial enamel and high-crowned incisors. -
MARINE MAMMALS, EXTINCTIONS of Glenn R
MARINE MAMMALS, EXTINCTIONS OF Glenn R. VanBlaricom,* Leah R. Gerber,† and Robert L. Brownell, Jr.‡ *U.S. Geological Survey and University of Washington, †University of California, Santa Barbara, and ‡National Marine Fisheries Service I. Introduction principal source for taxonomic nomenclature, includ- II. Patterns and Case Studies of Extinction in ing common names, is the recent review of Rice (1998). Marine Mammals The order Cetacea includes whales, dolphins, and III. Discussion porpoises (Table I). The ‘‘pinnipedia’’ is a group of species in three families in the mammalian order Carni- vora (Table I). The pinnipeds include the seals, fur seals, sea lions, and walrus. The term pinnipedia is no I. INTRODUCTION longer recognized formally by marine mammal taxono- mists, but it continues to appear in the systematic ver- A. Taxonomic Definition of nacular as a matter of tradition and convenience. The order Sirenia includes the extant manatees and dugong ‘‘Marine Mammals’’ and the extinct Steller’s sea cow (Table I). The order The marine mammals include one extinct order and Desmostylia is the only recognized order of marine three major extant taxa that were or are fully aquatic, mammals to become entirely extinct. in most cases occurring entirely in the marine habitats Two largely terrestrial families of the order Carnivora of the major ocean basins and associated coastal seas also include species recognized as marine mammals and estuaries. In addition, a few species of largely terres- (Table I). Sea otters and chungungos (family Mustel- trial taxa are currently regarded as marine mammals. idae) live entirely or primarily in marine habitats. Polar We consider 127 recent mammal species in total to bears (family Ursidae) also spend a significant propor- be marine mammals for purposes of this review. -
Sirenian Feeding Apparatus: Functional Morphology of Feeding Involving Perioral Bristles and Associated Structures
THE SIRENIAN FEEDING APPARATUS: FUNCTIONAL MORPHOLOGY OF FEEDING INVOLVING PERIORAL BRISTLES AND ASSOCIATED STRUCTURES By CHRISTOPHER DOUGLAS MARSHALL A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNrVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REOUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY UNIVERSITY OF FLORIDA 1997 DEDICATION to us simply as I dedicate this work to the memory of J. Rooker (known "Rooker") and to sirenian conservation. Rooker was a subject involved in the study during the 1993 sampling year at Lowry Park Zoological Gardens. Rooker died during the red tide event in May of 1996; approximately 140 other manatees also died. During his rehabilitation at Lowry Park Zoo, Rooker provided much information regarding the mechanism of manatee feeding and use of the perioral bristles. The "mortality incident" involving the red tide event in southwest Florida during the summer of 1996 should serve as a reminder that the Florida manatee population and the status of all sirenians is precarious. Although some estimates suggest that the Florida manatee population may be stable, annual mortality numbers as well as habitat degradation continue to increase. Sirenian conservation and research efforts must continue. ii ACKNOWLEDGMENTS Research involving Florida manatees required that I work with several different government agencies and private parks. The staff of the Sirenia Project, U.S. Geological Service, Biological Resources Division - Florida Caribbean Science Center has been most helpful in conducting the behavioral aspect of this research and allowed this work to occur under their permit (U.S. Fish and Wildlife Permit number PRT-791721). Numerous conversations regarding manatee biology with Dr. -
Afrotherian Conservation – Number 16
AFROTHERIAN CONSERVATION Newsletter of the IUCN/SSC Afrotheria Specialist Group Number 16 Edited by PJ Stephenson September 2020 Afrotherian Conservation is published annually by the measure the effectiveness of SSC’s actions on biodiversity IUCN Species Survival Commission Afrotheria Specialist conservation, identification of major new initiatives Group to promote the exchange of news and information needed to address critical conservation issues, on the conservation of, and applied research into, consultations on developing policies, guidelines and aardvarks, golden moles, hyraxes, otter shrews, sengis and standards, and increasing visibility and public awareness of tenrecs. the work of SSC, its network and key partners. Remarkably, 2020 marks the end of the current IUCN Published by IUCN, Gland, Switzerland. quadrennium, which means we will be dissolving the © 2020 International Union for Conservation of Nature membership once again in early 2021, then reassembling it and Natural Resources based on feedback from our members. I will be in touch ISSN: 1664-6754 with all members at the relevant time to find out who wishes to remain a member and whether there are any Find out more about the Group people you feel should be added to our group. No one is on our website at http://afrotheria.net/ASG.html automatically re-admitted, however, so you will all need to and on Twitter @Tweeting_Tenrec actively inform me of your wishes. We will very likely need to reassess the conservation status of all our species during the next quadrennium, so get ready for another round of Red Listing starting Message from the Chair sometime in the not too distant future. -
Karyotype Determination of Rock Hyrax Procavia Capensis in Saudi Arabia
© 2015 The Japan Mendel Society Cytologia 80(3): 287–293 Karyotype Determination of Rock Hyrax Procavia capensis in Saudi Arabia Saud A. Al-Dakan and Abdulaziz A. Al-Saleh* Zoology Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia Received November 1, 2014; accepted May 31, 2015 Summary Procavia capensis is considered as a small mammalian animal which belongs to order Hyracoidea, and it is the only species of the order that has been found in Saudi Arabia. Therefore, karyotype analysis of this species has been carried out and the finding summarized as follows. The diploid chromosome number is 54. In the karyotype analysis, the somatic chromosomes were catego- rized into three groups: 21 pairs of acrocentric, 2 pairs of submetacentric and 3 pairs of metacentric chromosomes. The sex chromosomes are one submetacentric X chromosome and one acrocentric Y chromosome. The lengths of chromosomes varied between 1.6–7.6 µm, and the Y chromosome is the shortest. The FN is 65 in the male and 66 in the female, while the FNa is 62. The karyotype formula of Procavia capensis could be deduced as: a sm a sm a sm m (2=54);Ln 14+ L 1 + M 14 + M 2 ++ S 15 S 2 + S 6 Key words Karyotype, Rock hyrex, Chromosome, Procavia capensis. The rock hyrax (Procavia capensis) is one of small mammalian herbovorous animals that lives in small family groups ranging from 10 to 80 members headed by a dominant adult male which defends and watches over the group (Turner and Watson 1965, Grzimek 1975, Skinner and Smithers 1990, Estes 1991, Kingdon 1991, Manharth and Harris-Gerber 2002). -
City's Limits: Can Verreaux's Eagle Survive Urbanization?
See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/289670312 City's limits: Can Verreaux's Eagle survive urbanization? Article · July 2007 CITATIONS READS 0 12 4 authors, including: Robert Simmons University of Cape Town 117 PUBLICATIONS 1,378 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Climate change View project Namibian Red data birds View project All content following this page was uploaded by Robert Simmons on 14 January 2016. The user has requested enhancement of the downloaded file. and bush encroachment, the raptors second pair live on the west side of the which need pristine woodlands rather Cape Peninsula mountain chain, in the than those that have been burnt and Silvermine area of the Table Mountain CITY’S logged, and some, such as the harriers National Park, just north of Chapman’s and the African Fish-Eagle, which live Peak. There they have bred successfully Can Verreaux’s Eagles survive urbanisation? around the fringes of degraded and for three years, monitored weekly by drained wetlands. their finder and eagle-advocate Lucia What of our montane eagles? Can Rodrigues. These pairs share similarities species, such as Verreaux’s (Black) Eagles and differences that allow us to assess Aquila verreauxii, which live along- if Verreaux’s Eagles can survive human side man, continue to thrive in their encroachment. mountain retreats? Two closely studied When the Roodekrans pair began Below An adult Verreaux’s Eagle arrives LIMITS examples, one from Johannesburg and to bring chickens to their nest, it was at its nest on the Roodekrans in the sub- the other from Cape Town, allow an apparent that the dassie (rock hyrax) urbs of Johannesburg. -
Chapter 15 the Mammals of Angola
Chapter 15 The Mammals of Angola Pedro Beja, Pedro Vaz Pinto, Luís Veríssimo, Elena Bersacola, Ezequiel Fabiano, Jorge M. Palmeirim, Ara Monadjem, Pedro Monterroso, Magdalena S. Svensson, and Peter John Taylor Abstract Scientific investigations on the mammals of Angola started over 150 years ago, but information remains scarce and scattered, with only one recent published account. Here we provide a synthesis of the mammals of Angola based on a thorough survey of primary and grey literature, as well as recent unpublished records. We present a short history of mammal research, and provide brief information on each species known to occur in the country. Particular attention is given to endemic and near endemic species. We also provide a zoogeographic outline and information on the conservation of Angolan mammals. We found confirmed records for 291 native species, most of which from the orders Rodentia (85), Chiroptera (73), Carnivora (39), and Cetartiodactyla (33). There is a large number of endemic and near endemic species, most of which are rodents or bats. The large diversity of species is favoured by the wide P. Beja (*) CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal CEABN-InBio, Centro de Ecologia Aplicada “Professor Baeta Neves”, Instituto Superior de Agronomia, Universidade de Lisboa, Lisboa, Portugal e-mail: [email protected] P. Vaz Pinto Fundação Kissama, Luanda, Angola CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Campus de Vairão, Vairão, Portugal e-mail: [email protected] L. Veríssimo Fundação Kissama, Luanda, Angola e-mail: [email protected] E. -
SUPPLEMENTARY INFORMATION: Tables, Figures and References
Samuels et al. Evolution of the patellar sesamoid bone in mammals SUPPLEMENTARY INFORMATION: Tables, Figures and References Supplementary Table S1: Mammals$ Higher taxa Genus sp. Estimated. age of Patellar Comments# (partial) specimen, location state 0/1/2 (absent/ ‘patelloid’/ present) Sinoconodonta Sinoconodon Jurassic 0 Patellar groove absent, suggests no rigneyi (Kielan- patella Jaworowska, Cifelli & Luo, Sinoconodon is included on our 2004) phylogeny within tritylodontids. Morganucodonta Megazostrodon Late Triassic, southern 0 rudnerae (Jenkins Africa & Parrington, 1976) Morganucodonta Eozostrodon sp. Late Triassic, Wales 0 Asymmetric patellar groove, (Jenkins et al., specimens disarticulated so it is hard 1976) to assess the patella but appears absent Docodonta Castorocauda 164 Mya, mid-Jurassic, 0 Semi-aquatic adaptations lutrasimilis (Ji, China Luo, Yuan et al., 2006) Docodonta Agilodocodon 164 Mya, mid-Jurassic, 0 scansorius China (Meng, Ji, Zhang et al., 2015) Docodonta Docofossor 160 Mya 0 brachydactylus (Luo, Meng, Ji et al., 2015) Docodonta Haldanodon 150-155 Mya, Late 0 Shallow patellar groove exspectatus Jurassic, Portugal (Martin, 2005b) Australosphenida Asfaltomylos Mid-Jurassic, South ? Postcranial material absent patagonicus America (Martin, 2005a) Australosphenida Ornithorhynchus Extant 2 Platypus, genome sequenced Monotremata anatinus (Warren, Hillier, Marshall Graves et (Herzmark, 1938; al., 2008) Rowe, 1988) Samuels et al. Australosphenida Tachyglossus + Extant 2 Echidnas Monotremata Zaglossus spp. (Herzmark, 1938; Rowe, 1988) Mammaliaformes Fruitafossor 150 Mya, Late Jurassic, 0 Phylogenetic status uncertain indet. windscheffeli (Luo Colorado & Wible, 2005) Mammaliaformes Volaticotherium Late Jurassic/Early ? Hindlimb material incomplete indet. antiquus (Meng, Cretaceous Hu, Wang et al., 2006) Eutriconodonta Jeholodens 120-125 Mya, Early 0 Poorly developed patellar groove jenkinsi (Ji, Luo Cretaceous, China & Ji, 1999) Eutriconodonta Gobiconodon spp. -
Evolution of the Sirenia: an Outline
Caryn Self-Sullivan, Daryl P. Domning, and Jorge Velez-Juarbe Last Updated: 8/1/14 Page 1 of 10 Evolution of the Sirenia: An Outline The order Sirenia is closely associated with a large group of hoofed mammals known as Tethytheria, which includes the extinct orders Desmostylia (hippopotamus-like marine mammals) and Embrithopoda (rhinoceros-like mammals). Sirenians probably split off from these relatives in the Palaeocene (65-54 mya) and quickly took to the water, dispersing to the New World. This outline attempts to order all the species described from the fossil record in chronological order within each of the recognized families of Prorastomidae, Protosirenidae, Dugongidae, and Trichechidae. This outline began as an exercise in preparation for my Ph. D. preliminary exams and is primarily based on decades of research and peer-reviewed literature by Dr. Daryl P. Domning, to whom I am eternally grateful. It has been recently updated with the help of Dr. Jorge Velez-Juarbe. However, this document continues to be a work-in-progress and not a peer reviewed publication! Ancestral line: Eritherium Order Proboscidea Elephantidae (elephants and mammoths) Mastodontidae Deinotheriidae Gomphotheriidae Ancestral line: Behemotops Order Desmostylia (only known extinct Order of marine mammal) Order Sirenia Illiger, 1811 Prorastomidae Protosirenidae Dr. Daryl Domning, Howard University, November 2007 Dugongidae with Metaxytherium skull. Photo © Caryn Self-Sullivan Trichechidae With only 5 species in 2 families known to modern man, you might be surprised to learn that the four extant species represent only a small fraction of the sirenians found in the fossil record. As of 2012, ~60 species have been described and placed in 4 families. -
Late Oligocene) of Argentina
J. Paleont., 81(6), 2007, pp. 1301–1307 Copyright ᭧ 2007, The Paleontological Society 0022-3360/07/0081-1301$03.00 A POORLY KNOWN RODENTLIKE MAMMAL (PACHYRUKHINAE, HEGETOTHERIIDAE, NOTOUNGULATA) FROM THE DESEADAN (LATE OLIGOCENE) OF ARGENTINA. PALEOECOLOGY, BIOGEOGRAPHY, AND RADIATION OF THE RODENTLIKE UNGULATES IN SOUTH AMERICA MARCELO A. REGUERO,1 MARI´A TERESA DOZO,2 AND ESPERANZA CERDEN˜ O3 1Divisio´n Paleontologı´a de Vertebrados, Museo de La Plata, B1900FWA La Plata, Argentina, Ͻ[email protected]Ͼ, 2Laboratorio de Paleontologı´a, Centro Nacional Patagonico, Consejo Nacional de Investigaciones Cientificas y Te´cnicas, 9120 Puerto Madryn, Chubut, Argentina, Ͻ[email protected]Ͼ, and 3Departamento de Geologı´a y Paleontologı´a, Instituto Argentino de Nivologı´a, Glaciologı´a, y Ciencias Ambientales, Centro Regional de Investigaciones Cientı´ficas y Te´cnicas, Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas, Avda. Ruiz Leal s/n, 5500 Mendoza, Argentina, Ͻ[email protected]Ͼ ABSTRACT—The cranial anatomy of the Deseadan species Medistylus dorsatus (Ameghino, 1903) is described based on new and complete material from Cabeza Blanca (Chubut, Argentina). Medistylus is the largest of the Pachyrukhinae and the specimen described here is probably the best-preserved pachyrukhine skull known in the Paleogene of South America. Previously, the validity of the species and its phylogenetic affinities with Interatheriidae (Notoungulata, Typotheria) were ambiguous and not conclusive. The syntypes, now reported lost, were isolated teeth poorly described by Ameghino in 1903. This almost complete skull with teeth provides more diagnostic features in order to complete the knowledge of genus. Details about cranial and dental morphology allow the reassessment of Medistylus dorsatus and its inclusion within the subfamily Pachyrukhinae (Hegetotheriidae, Notoungulata). -
The African Elephant Under Threat
AFROTHERIAN CONSERVATION Newsletter of the IUCN/SSC Afrotheria Specialist Group Number 11 Edited by PJ Stephenson October 2015 Afrotherian Conservation is published annually by the To help PJ focus on our conservation work, Chris IUCN Species Survival Commission Afrotheria Specialist and Mathilde Stuart have kindly agreed to take on the Group to promote the exchange of news and information role of editing the next edition of Afrotherian Conservation. on the conservation of, and applied research into, golden Their contacts are in the guidelines for submissions (page moles, sengis, hyraxes, tenrecs and the aardvark. 17). We hope you’ll send them plenty of material for the next edition. Published by IUCN, Gland, Switzerland. © 2015 International Union for Conservation of Nature Galen Rathbun, Cambria, California, USA and Natural Resources & ISSN: 1664-6754 PJ Stephenson, Gland, Switzerland 1 October 2015 Find out more about the Group on our website at http://afrotheria.net/ASG.html and follow us on Twitter @Tweeting_Tenrec Message from the Chairs Galen Rathbun & PJ Stephenson Co-Chairs, IUCN/SSC Afrotheria Specialist Group It’s been a busy twelve months for the group. Sadly, 2015 started with the terrible news that Peter Vogel had passed away. Peter was a global expert on shrews but he was a long-term member of the group due to his specialist knowledge of otter-shrews; he was one of the few biologists to capture and study these illusive afrotheres. We include an obituary to Peter on page 8 and send our Chequered sengi (Rhynchocyon cirnei) by Jonathan Kingdon condolences to his family, friends and colleagues. -
Un Nuevo Trachytheriinae (Mammalia,†Notoungulata) Del
Un nuevo Trachytheriinae (Mammalia, †Notoungulata) del Deseadense (Oligoceno tardío) de Patagonia, Argentina: implicancias en la filogenia, biogeografía y bioestratigrafía de los Mesotheriidae Marcelo A. Reguero Departamento Científico Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900, La Plata, Argentina [email protected] Paula V. Castro Subsecretaría de Cultura, Ministerio de Gobierno, Trabajo y Justicia, Roberto Jones 572, 9103 Rawson, Argentina [email protected] RESUMEN Una mandíbula incompleta de un Trachytheriinae de Edad deseadense recolectada por Carlos Ameghino en Cabeza Blanca, Provincia de Chubut, Argentina, es asignada a Anatrachytherus soria gen et sp. nov. Florentino Ameghino la ilustró, refiriéndola a Trachytherus spegazzinianus Ameghino, un taxón característico de la Edad deseadense (Oligoceno tardío) de Argentina y Bolivia. Algunas características de A. soriai, e.g., cuerpo mandibular más corto, i1-2 poco procumbentes, fórmula dentaria más completa, corto diastema entre i2 y canino y m3 más corto que el m2, sugieren que se trata de un taxón más primitivo que T. spegazzinianus. El análisis filogenético sobre la base de 39 caracteres craneanos y dentarios sustenta la monofilia de esta especie, con una sola sinapomorfía, y una relación próxima de grupo hermano con Trachytherus. El análisis de parsimonia también sugiere que Mesotheriidae es el clado que contiene el ancestro común más reciente con Trachytherus? mendocensis, Anatrachytherus y Trachytherus y todos sus descendien- tes incluyendo a Mesotheriinae. La ausencia de mesotéridos en las SALMAs ('South American Land Mammal Age') Colhuehuapense y Santacrucense en Patagonia y las relaciones estratigráficas y filogenéticas de los Mesotheriinae, sugieren que el Altiplano chileno y boliviano habría actuado biogeográficamente como centro de origen y dispersión de los Mesotheriinae (clado hipselodonte).