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Geology
NEW SERIES, NO. 49
Large Archaeohyracids (Typotheria,…
Information for Contributors to Fieldiana
Fieldiana is a peer-reviewed monographic series published by the Field Museum. The…
FIELDIANA
Geology
NEW SERIES, NO. 49
Large Archaeohyracids (Typotheria,
Notoungulata) from Central Chile and
Patagonia,…
© 2003 Field Museum of Natural History
ISSN 0096-2651
PRINTED IN THE UNITED STATES OF AMERICA
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EOLOGY LIBRARY
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Table of Contents
Abstract
1
Introduction
1
Taxonomic Notes
3
Abbreviations
3
Tooth…
Contributors
Darin A. Croft
Department of Organismal Biology
and Anatomy
The University of Chicago
1027 East 57th Street…
Large Archaeohyracids (Typotheria, Notoungulata)
from Central Chile and Patagonia, Including a
Revision of Archaeotypotherium…
Fig. 1.
MACN A52-617, holotype oi Archaeohyrax patagonicus, left side of skull, viewed as right (adapted from
Ameghino, 1897…
typotheres) were members of the endemic South
American group Notoungulata. George Gaylord
Simpson's views on the…
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isolated), or heavy wear (central fossa absent; fea-
tureless occlusal surface). Although division of
tooth wear into a…
Table 2. Measurements of molar row lengths for specimens of Archaeohyrax sp. nov. (Salla, Bolivia; Deseadan
SALMA) and…
Fig. 4.
MACN A52-618, holotype of Archaeotypotherium propheticus, mandibular symphysis and portion of
right horizontal ramus…
Fig. 6.
Specimens included in hypodigm of Ar-
chaeotypotherium propheticus. A. MACN A52-630,
right M2 and right m3. B. MACN…
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sential characters of the remaining upper cheek
teeth have been given in the diagnosis of Ar-
chaeotypotherium. Detachment of…
Fig. 7.
Epoxy cast of SGOPV 2823, holotype of Archaeotypothehum tinguiriricaense, palate with left and right
C1-M2 (canines…
Fig. 8.
Epoxy cast of SGOPV 2851, palate with left 11-3, left and right P2-M3, in occlusal view. Specimen
illustrates heavily…
Fig. 10.
Epoxy cast of SGOPV 3043, partial left and right mandibles (fused) of Archaeotypotherium tinguiriri-
caense with…
Fig. 1 1.
Epoxy casts of skull and deciduous dentition of Archaeotypotherium tinguiriricaense. A. SGOPV 2900,
slightly…
Table 4. Measurements to the nearest 0.1 mm for specimens of Archaeotypotherium tinguiriricaense. Specimens
are arranged in…
stage, the internal cingulum is slightly below the
occlusal surface of the lingual portion of the
tooth. The presence of a…
structure to i3 in other specimens, we favor the
latter alternative, pending additional specimens
that might suggest…
present within the lateral depressions on the sym-
physis, almost directly beneath the canine.
The premolars are all heavily…
Fig. 12.
Epoxy casts of specimens of Archaeotypotherium pattersoni. A. SGOPV 2918 (holotype), right maxilla
with P2-M3,…
Table 5. Measurements to the nearest 0.1 mm for specimens oi Archaeotypotherium pattersoni. Measurements
in parentheses are…
Included Species—The type species, Pseudhy-
rax strangulatus (Ameghino, 1901), and the in-
determinate material described…
Fig. 14.
Mandibles from the Tinguiririca Fauna referred to Pseudhyrax. A, Epoxy cast of SGOPV 2887, Pseud-
hyrax strangulatus…
B
Fig. 15.
SGOPV 2877, Pseudhyrax cf. P. eutrachytheroides, left and right II, left P3-M3. A. Occlusal view. B.…
Fig. 16.
Occlusal views of P. eutrachytheroides
specimens from the Mustersan of Chubut, Argentina. A.
MLP 61-IV-9-1,…
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Fig. 17.
SGOPV 2901, Pseudhyrax sp. indet., left
mandibular fragment with partial ml-m3 in oblique la-
bial view (left) and…
a small fossettid directly posterior to the central
fossa, a condition characteristic of Pseudhyrax; no
other characters of…
Table 8. Matrix of characters used in phylogenetic analysis of archaeohyacid relationships.
Oldfieldthomasia
Acropithecus
Eohyrax
Pseudhyrax
Archaeotypotherium
Protarchaeohyrax
Archaeohyrax
Hegetotherium
Fig. 18…
(in the classical sense of that name) is now shown
to be paraphyletic.
From the perspective of phylogenetic taxonomy
(de…
nation of the members (e.g., Archaeohegetotheria,
Hegetoarchaeohyracoidea) could also be used.
Some combination of these…
mostly late Oligocene Deseadan SALMA. Filling
a niche that presumably was similar to that of the
hypsodont archaeohyracids,…
South American Land Mammal Ages: Correlation to
global geochronologies, pp. 317-333. In Berggren, W.
A., D. V. Kent, M.-P.…
Reguero, M. a., D. a. Croft, J. J. Flynn, and A. R.
Wyss. (2003). Small archaeohyracids (Typotheria,
Notoungulata) from…
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