Oldest placental mammal from sub-Saharan Africa: Eocene microbat from Tanzania - Evidence for early evolution of sophisticated echolocation

A partial skeleton of a new fossil microbat, Tanzanycteris mannardi, is the oldest placental mammal found in sub-Saharan Africa. It came from early Lutetian (46 Ma) lake sediments in north-central Tanzania. T. mannardi has enlarged cochleae indicating it was capable of a highly derived form of echolocation. Modern bats sharing similar morphology are capable of precise navigation in dense forest undergrowth. The phylogenetic relationships of T. mannardi are unclear. It shares character states with Eocene Hassianycterididae, with extant Microchiroptera, and with Rhinolophoidea within Microchiroptera. T. mannardi is important in documenting early evolution of sophisticated bat echolocating abilities and demonstrating that Tanzanian crater lakes offer an opportunity for future discoveries of Eocene mammals from the African interior. Copyright: Society of Vertebrate Paleontology. 28 March 2003 Submission: 26 September 2002 Acceptance: 19 November 2002

[1]  E. Teeling,et al.  Integrated fossil and molecular data reconstruct bat echolocation , 2001, Proceedings of the National Academy of Sciences of the United States of America.

[2]  J. Habersetzer,et al.  Cochlea size in extant chiroptera and middle eocene microchiropterans from messel , 1992, Naturwissenschaften.

[3]  M. Miyamoto,et al.  Phylogenetic assessment of molecular and morphological data for eutherian mammals. , 1999, Systematic biology.

[4]  G. Jepsen,et al.  Early Eocene Bat from Wyoming , 1966, Science.

[5]  E. Simons.  Egyptian oligocene primates: A review , 1995 .

[6]  P. Gingerich,et al.  Lipotyphla, Proteutheria(?), and Chiroptera (Mammalia) from the Early-Middle Eocene Kuldana Formation of Kohat (Pakistan) , 1981 .

[7]  C. Martinez,et al.  Découverte de mammifères d'âge éocène inférieur en Tunisie Centrale , 1985 .

[8]  P. Herendeen,et al.  Fossil legumes from the Middle Eocene (46.0 Ma) Mahenge Flora of Singida, Tanzania. , 2000, American journal of botany.

[9]  M. Pickford.  Première découverte d'une faune mammalienne terrestre paléogène d'Afrique sub-saharienne , 1986 .

[10]  K. Rose,et al.  Dawn of the Age of Mammals in the Northern Part of the Rocky Mountain Interior, North America , 1990 .

[11]  Marc Godinot,et al.  Les petits primates simiiformes de Glib Zegdou (Eocène inférieur à moyen d'Algérie) , 1994 .

[12]  P. Coiffait,et al.  Un nouveau gisement à mammifères fossiles d'âge Eocène supérieur sur le versant sud des Nementcha (Algérie orientale): découverte des plus anciens rongeurs d'Afrique , 1984 .

[13]  Michael Archer,et al.  First Eocene bat from Australia , 1994 .

[14]  M. Novacek.  Auditory features and affinities of the Eocene bats Icaronycteris and Palaeochiropteryx (Microchiroptera, incertae sedis) / Michael J. Novacek. American Museum novitates ; no. 2877 , 1987 .

[15]  P. Holroyd,et al.  Paleogeography, Paleobiogeography, and Anthropoid Origins , 1994 .

[16]  R. J. Rayner.  March Flies from an African Cretaceous springtime , 1987 .

[17]  M. K. Obrist,et al.  Signal strength, timing, and self-deafening: the evolution of echolocation in bats , 1995, Paleobiology.

[18]  E. Gheerbrant.  Les mammifères paléocènes du Bassin d'Ouarzazate (Maroc). III. Adapisoriculidae et autres mammifères (Carnivora,? Creodonta, Condylarthra,? Ungulata et incertae sedis) , 1995 .

[19]  D. Krause,et al.  The biogeographic origins of late Paleocene–early Eocene mammalian immigrants to the Western Interior of North America , 1990 .

[20]  J. Geisler,et al.  Phylogenetic relationships of Icaronycteris, Archaeonycteris, Hassianycteris, and Palaeochiropteryx to extant bat lineages, with comments on the evolution of echolocation and foraging strategies in Microchiroptera. Bulletin of the AMNH ; no. 235 , 1998 .

[21]  W. Murphy,et al.  Resolution of the Early Placental Mammal Radiation Using Bayesian Phylogenetics , 2001, Science.

[22]  R. Mundil,et al.  Paleontological investigations at the Eocene locality of Mahenge in north-­‐central Tanzania, East Africa , 2001 .

[23]  E. Gheerbrant.  On the early biogeographical history of the African placentals , 1990 .

[24]  J. Alroy,et al.  Mammalian Dispersal at the Paleocene/Eocene Boundary , 2002, Science.

[25]  V. Lorenz,et al.  On the formation of maars , 1973 .

[26]  J. Hooker.  A primitive emballonurid bat (Chiroptera, Mammalia) from the earliest Eocene of England , 1996 .

[27]  A. Murray.  EOCENE CICHLID FISHES FROM TANZANIA, EAST AFRICA , 2001 .

[28]  J. Maley,et al.  Sedimentation and palaeoenvironment in crater lake Barombi Mbo, Cameroon, during the last 25,000 years , 1991 .

[29]  Claude Martinez,et al.  The Eocene Mammalian Fauna of Chambi (Tunisia) in Its Geological Context , 2001 .

[30]  J. Jaeger,et al.  El kohol saharan atlas algeria a new eocene mammal locality in northwestern africa stratigraphical phylogenetic and paleobiogeographical data , 1986 .

[31]  Emma C. Teeling,et al.  Microbat paraphyly and the convergent evolution of a key innovation in Old World rhinolophoid microbats , 2002, Proceedings of the National Academy of Sciences of the United States of America.

[32]  G. Cornena,et al.  The nature and chronostratigraphy of Quaternary pyroclastic accumulations from Lake Barombi Mbo ( West-Cameroon ) , 2001 .

[33]  M. Woodburne,et al.  Dispersal, vicariance, and the Late Cretaceous to early tertiary land mammal biogeography from South America to Australia , 1996, Journal of Mammalian Evolution.

[34]  Roger M. H. Smith.  Sedimentation and palaeoenvironments of Late Cretaceous crater-lake deposits in Bushmanland, South Africa , 1986 .

[35]  M. Stanhope,et al.  Additional support for Afrotheria and Paenungulata, the performance of mitochondrial versus nuclear genes, and the impact of data partitions with heterogeneous base composition. , 1999, Systematic biology.

[36]  Ş. Şen,et al.  Découverte des plus anciens «anthropoïdes» du continent arabo-africain et d'un primate tarsiiforme dans l'Oligocène du sultanat d'Oman , 1988 .

[37]  W. Mckerrow.  Symposium on the Geology of Libya. Carlyle Gray , 1974 .

[38]  L. Krishtalka,et al.  A primitive vespertilionoid bat from the early Eocene of central Wyoming , 1992 .

[39]  E. Simons,et al.  28. The Eocene-Oligocene Transition in Continental Africa , 1992 .

[40]  B. Sigé.  Rhinolophoidea et Vespertilionoidea (Chiroptera) du Chambi (Eocène inférieur de Tunisie) Aspects biostratigraphique, biogéographique et paléoécologique de l'origine des chiroptères modernes , 1991 .

[41]  J. Sudre,et al.  Phosphatherium escuillieidu Thanétien du Bassin des Ouled Abdoun (Maroc), plus ancien proboscidien (Mammalia) d'Afrique , 1998 .

[42]  J. Stevenson,et al.  [The] geology of the Singida kimberlite pipes, Tanganyika , 1962 .

[43]  M. Schlosser.  Über einige fossile Säugetiere aus dem Oligozän von Ägypten , 2005, Zeitschrift für Induktive Abstammungs- und Vererbungslehre.

[44]  B. Sigé,et al.  Altiatlasius koulchii n. gen. et sp., primate omomyidé du Paléocène supérieur du Maroc, et les origines des euprimates , 1990 .

[45]  Thomas H. Kunz,et al.  Bat Biology and Conservation , 1998 .

[46]  W. Berggren,et al.  Eocene-Oligocene Climatic and Biotic Evolution , 1992 .