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<mods:title id="224EB15760B7230D5FCB1674B7A42EE8">Systematics of the genus Palaeictops Matthew, 1899 (Mammalia: Leptictidae), with the description of two new species from the Middle Eocene of Utah and Wyoming</mods:title>
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<treatment id="0386879BFB1B9C58FDC8317A8A23FA63" ID-DOI="http://doi.org/10.5281/zenodo.5056603" ID-GBIF-Taxon="183232354" ID-Zenodo-Dep="5056603" LSID="urn:lsid:plazi:treatment:0386879BFB1B9C58FDC8317A8A23FA63" httpUri="http://treatment.plazi.org/id/0386879BFB1B9C58FDC8317A8A23FA63" lastPageId="32" lastPageNumber="33" pageId="31" pageNumber="32">
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<paragraph id="8B90368DFB1B9C67FDC8317A8AE0FAB0" blockId="31.[580,764,1297,1324]" box="[580,764,1297,1324]" pageId="31" pageNumber="32">
<heading id="D0D881E1FB1B9C67FDC8317A8AE0FAB0" box="[580,764,1297,1324]" centered="true" fontSize="11" level="2" pageId="31" pageNumber="32" reason="5">
<taxonomicName id="4C2F4D0EFB1B9C67FDC8317A8AD8FAB7" authorityName="Matthew" authorityYear="1899" box="[580,708,1297,1323]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB1B9C67FDC8317A8AD8FAB7" box="[580,708,1297,1323]" italics="true" pageId="31" pageNumber="32">Palaeictops</emphasis>
</taxonomicName>
spp.
</heading>
</paragraph>
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<subSubSection id="C3356506FB1B9C58FF2431228A23FA63" lastPageId="32" lastPageNumber="33" pageId="31" pageNumber="32" type="discussion">
<paragraph id="8B90368DFB1B9C67FF2431228BF3FA65" blockId="31.[120,1224,1353,1754]" pageId="31" pageNumber="32">
REMARKS: Two designated species from Middle Eocene beds are clearly leptictids, but their validity as separate taxa is dubious. The species are
<taxonomicName id="4C2F4D0EFB1B9C67FCBF31048C39FA15" authorityName="Gazin" authorityYear="1949" box="[819,1061,1391,1417]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="syntaphus">
<emphasis id="B95BEA9FFB1B9C67FCBF31048C39FA15" box="[819,1061,1391,1417]" italics="true" pageId="31" pageNumber="32">Hypictops syntaphus</emphasis>
</taxonomicName>
described by
<bibRefCitation id="EFBE4B7CFB1B9C67FFF431FF890AFA32" author="Gazin, C. L." box="[120,278,1428,1454]" pageId="31" pageNumber="32" pagination="220 - 223" refId="ref13842" refString="Gazin, C. L. 1949. A leptictid insectivore from the middle Eocene Bridger Formation of Wyoming. Journal of the Washington Academy of Sciences 39: 220 - 223." type="journal article" year="1949">Gazin (1949)</bibRefCitation>
from a maxilla with a right P1M3 (USNM 13445) found north of Lone Tree in the Bridger Basin of
<collectingRegion id="49EBF86FFB1B9C67FE1531D28A0DFA4F" box="[409,529,1465,1491]" country="United States of America" name="Wyoming" pageId="31" pageNumber="32">Wyoming</collectingRegion>
, and
<taxonomicName id="4C2F4D0EFB1B9C67FDD831D18ACDFA4F" authorityName="Marsh" authorityYear="1872" box="[596,721,1466,1491]" class="Mammalia" family="Viverravidae" genus="Viverravus" higherTaxonomySource="GBIF" kingdom="Animalia" order="Carnivora" pageId="31" pageNumber="32" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB1B9C67FDD831D18ACDFA4F" box="[596,721,1466,1491]" italics="true" pageId="31" pageNumber="32">Viverravus</emphasis>
</taxonomicName>
?
<taxonomicName id="4C2F4D0EFB1B9C67FD6A31D28BFBFA4F" authority="Marsh (1872)" authorityName="Marsh" authorityYear="1872" box="[742,999,1465,1491]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="nitidus">
<emphasis id="B95BEA9FFB1B9C67FD6A31D28B2BFA4F" box="[742,823,1465,1491]" italics="true" pageId="31" pageNumber="32">nitidus</emphasis>
<bibRefCitation id="EFBE4B7CFB1B9C67FCCC31D28BFBFA4F" author="Marsh, O. C." box="[832,999,1465,1491]" pageId="31" pageNumber="32" pagination="202 - 224" refId="ref14577" refString="Marsh, O. C. 1872. Preliminary description of new Tertiary mammals. American Journal of Science 3: 202 - 224." type="journal article" year="1872">Marsh (1872)</bibRefCitation>
</taxonomicName>
, known only from a left dp5 (YPM VP 11888) from Henrys Fork, also in the Bridger Basin.
</paragraph>
<paragraph id="8B90368DFB1B9C67FF24326F8AD9F913" blockId="31.[120,1224,1353,1754]" pageId="31" pageNumber="32">
The teeth of
<taxonomicName id="4C2F4D0EFB1B9C67FEB0326E8A34F982" authorityName="Gazin" authorityYear="1949" box="[316,552,1540,1566]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="syntaphus">
<emphasis id="B95BEA9FFB1B9C67FEB0326E8A34F982" box="[316,552,1540,1566]" italics="true" pageId="31" pageNumber="32">Hypictops syntaphus</emphasis>
</taxonomicName>
are badly worn (
<bibRefCitation id="EFBE4B7CFB1B9C67FD62326F8B63F982" author="Gazin, C. L." box="[750,895,1540,1566]" pageId="31" pageNumber="32" pagination="220 - 223" refId="ref13842" refString="Gazin, C. L. 1949. A leptictid insectivore from the middle Eocene Bridger Formation of Wyoming. Journal of the Washington Academy of Sciences 39: 220 - 223." type="journal article" year="1949">Gazin, 1949</bibRefCitation>
: fig. 1), but they are comparable in size to upper teeth that would occlude with the lower dentition of the
<typeStatus id="5494882FFB1B9C67FBB332428CBBF9DF" box="[1087,1191,1577,1603]" pageId="31" pageNumber="32" type="holotype">holotype</typeStatus>
of
<taxonomicName id="4C2F4D0EFB1B9C67FFF432248940F9F5" box="[120,348,1615,1641]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="bridgeri">
<emphasis id="B95BEA9FFB1B9C67FFF432248940F9F5" box="[120,348,1615,1641]" italics="true" pageId="31" pageNumber="32">Palaeictops bridgeri</emphasis>
</taxonomicName>
(contra
<bibRefCitation id="EFBE4B7CFB1B9C67FE4F32248A6AF9F5" author="Simpson, G. G." box="[451,630,1614,1641]" pageId="31" pageNumber="32" pagination="1 - 5" refId="ref15457" refString="Simpson, G. G. 1959. Two new records from the Bridger middle Eocene of Tabernacle Butte, Wyoming. American Museum Novitates 1966: 1 - 5." type="journal article" year="1959">Simpson, 1959</bibRefCitation>
). The M2 of “
<taxonomicName id="4C2F4D0EFB1B9C67FC9132248B92F9F4" authorityName="Gazin" authorityYear="1949" box="[797,910,1615,1640]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB1B9C67FC9132248B92F9F4" box="[797,910,1615,1640]" italics="true" pageId="31" pageNumber="32">Hypictops</emphasis>
</taxonomicName>
” is also similar to the M2 from Tabernacle Butte referred here to
<taxonomicName id="4C2F4D0EFB1B9C67FDC5321E8AA2F912" box="[585,702,1652,1678]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="bridgeri">
<emphasis id="B95BEA9FFB1B9C67FDC5321E8AA2F912" box="[585,702,1652,1678]" italics="true" pageId="31" pageNumber="32">P. bridgeri</emphasis>
</taxonomicName>
.
</paragraph>
<paragraph id="8B90368DFB1B9C58FF2432F28988FAD8" blockId="31.[120,1224,1353,1754]" lastBlockId="32.[120,1224,1172,1535]" lastPageId="32" lastPageNumber="33" pageId="31" pageNumber="32">
<bibRefCitation id="EFBE4B7CFB1B9C67FF2432F28986F92F" author="Matthew, W. D." box="[168,410,1689,1715]" pageId="31" pageNumber="32" pagination="289 - 576" refId="ref14638" refString="Matthew, W. D. 1909. The Carnivora and Insectivora of the Bridger Basin, middle Eocene. Memoirs of the American Museum of Natural History 9 (6): 289 - 576." type="journal article" year="1909">Matthew (1909: 342)</bibRefCitation>
remarked that YPM VP 11888, the
<typeStatus id="5494882FFB1B9C67FCB732F18B72F928" box="[827,878,1690,1716]" pageId="31" pageNumber="32">type</typeStatus>
of
<taxonomicName id="4C2F4D0EFB1B9C67FC1E32F18C12F92F" authorityName="Marsh" authorityYear="1872" box="[914,1038,1690,1715]" class="Mammalia" family="Viverravidae" genus="Viverravus" higherTaxonomySource="GBIF" kingdom="Animalia" order="Carnivora" pageId="31" pageNumber="32" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB1B9C67FC1E32F18C12F92F" box="[914,1038,1690,1715]" italics="true" pageId="31" pageNumber="32">Viverravus</emphasis>
</taxonomicName>
?
<taxonomicName id="4C2F4D0EFB1B9C67FBAC32F288AFF945" authority="Marsh, 1872" authorityName="Marsh" authorityYear="1872" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="31" pageNumber="32" phylum="Chordata" rank="species" species="nitidus">
<emphasis id="B95BEA9FFB1B9C67FBAC32F28C73F92F" box="[1056,1135,1689,1715]" italics="true" pageId="31" pageNumber="32">nitidus</emphasis>
<bibRefCitation id="EFBE4B7CFB1B9C67FBFA32F288AFF945" author="Marsh, O. C." pageId="31" pageNumber="32" pagination="202 - 224" refId="ref14577" refString="Marsh, O. C. 1872. Preliminary description of new Tertiary mammals. American Journal of Science 3: 202 - 224." type="journal article" year="1872">Marsh, 1872</bibRefCitation>
</taxonomicName>
, was probably a deciduous last lower premolar of a leptictid.
<bibRefCitation id="EFBE4B7CFB1B9C67FC0B32D48C91F946" author="McKenna, M. C. &amp; P. Robinson &amp; D. W. Taylor" box="[903,1165,1727,1754]" pageId="31" pageNumber="32" pagination="1 - 33" refId="ref15023" refString="McKenna, M. C., P. Robinson, and D. W. Taylor. 1962. Notes on Eocene Mammalia and Mollusca from Tabernacle Butte, Wyoming. American Museum Novitates 2102: 1 - 33." type="journal article" year="1962">McKenna et al. (1962)</bibRefCitation>
suggested that this tooth could be a permanent p4 (equals p5 of this paper) of
<taxonomicName id="4C2F4D0EFB249C58FC5430FE8CDDFB32" authorityName="Gazin" authorityYear="1949" box="[984,1217,1172,1198]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="syntaphus">
<emphasis id="B95BEA9FFB249C58FC5430FE8CDDFB32" box="[984,1217,1172,1198]" italics="true" pageId="32" pageNumber="33">Hypictops syntaphus</emphasis>
</taxonomicName>
. Either assessment might be correct. The posterior position of the metaconid in YPM VP 11888 is very similar to the condition of the p
<quantity id="4CD79B68FB249C58FDCC30B58A71FB65" box="[576,621,1246,1273]" metricMagnitude="-1" metricUnit="m" metricValue="1.27" pageId="32" pageNumber="33" unit="in" value="5.0">5 in</quantity>
<taxonomicName id="4C2F4D0EFB249C58FDF830B48B49FB65" box="[628,853,1247,1273]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="bridgeri">
<emphasis id="B95BEA9FFB249C58FDF830B48B49FB65" box="[628,853,1247,1273]" italics="true" pageId="32" pageNumber="33">Palaeictops bridgeri</emphasis>
</taxonomicName>
. Some differences are apparent, however, and perhaps this is related to differences found between deciduous and permanent teeth of the same taxon.
</paragraph>
<caption id="DF506605FB249C58FFF430208935FBE2" ID-DOI="http://doi.org/10.5281/zenodo.4598427" ID-Zenodo-Dep="4598427" httpUri="https://zenodo.org/record/4598427/files/figure.png" pageId="32" pageNumber="33" startId="32.[120,162,1099,1120]" targetBox="[128,1217,227,1073]" targetPageId="32">
<paragraph id="8B90368DFB249C58FFF430208935FBE2" blockId="32.[120,1225,1097,1151]" pageId="32" pageNumber="33">
FIG. 18. Right ramus of
<taxonomicName id="4C2F4D0EFB249C58FEE730228A7DFBFD" authority="CM" authorityName="CM" box="[363,609,1097,1121]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="robustus">
<emphasis id="B95BEA9FFB249C58FEE730228A28FBFD" box="[363,564,1097,1121]" italics="true" pageId="32" pageNumber="33">Palaeictops robustus</emphasis>
CM
</taxonomicName>
11954 (holotype) in lateral (top) and medial (bottom) views. Scale bar = 2 cm.
</paragraph>
</caption>
<paragraph id="8B90368DFB249C58FF2431248A23FA63" blockId="32.[120,1224,1172,1535]" pageId="32" pageNumber="33">
Thus, there is a strong possibility that
<taxonomicName id="4C2F4D0EFB249C58FDD131248AC4FAF4" authorityName="Marsh" authorityYear="1872" box="[605,728,1359,1384]" class="Mammalia" family="Viverravidae" genus="Viverravus" higherTaxonomySource="GBIF" kingdom="Animalia" order="Carnivora" pageId="32" pageNumber="33" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB249C58FDD131248AC4FAF4" box="[605,728,1359,1384]" italics="true" pageId="32" pageNumber="33">Viverravus</emphasis>
</taxonomicName>
?
<taxonomicName id="4C2F4D0EFB249C58FD6631248B25FAF5" authorityName="Marsh" authorityYear="1872" box="[746,825,1359,1385]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="nitidus">
<emphasis id="B95BEA9FFB249C58FD6631248B25FAF5" box="[746,825,1359,1385]" italics="true" pageId="32" pageNumber="33">nitidus</emphasis>
</taxonomicName>
,
<emphasis id="B95BEA9FFB249C58FCC931248C29FAF5" box="[837,1077,1359,1385]" italics="true" pageId="32" pageNumber="33">
<taxonomicName id="4C2F4D0EFB249C58FCC931248C2DFAF5" authorityName="Gazin" authorityYear="1949" box="[837,1073,1359,1385]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="syntaphus">Hypictops syntaphus</taxonomicName>
,
</emphasis>
and
<taxonomicName id="4C2F4D0EFB249C58FBE131248916FA12" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="bridgeri">
<emphasis id="B95BEA9FFB249C58FBE131248916FA12" italics="true" pageId="32" pageNumber="33">Palaeictops bridgeri</emphasis>
</taxonomicName>
are one and the same taxon. Synonymy would unfortunately establish YPM VP 11888, a single enigmatic tooth, as the
<typeStatus id="5494882FFB249C58FDD631F18A91FA28" box="[602,653,1434,1460]" pageId="32" pageNumber="33">type</typeStatus>
for
<taxonomicName id="4C2F4D0EFB249C58FD4831F28BBDFA2F" authorityName="Marsh" authorityYear="1872" box="[708,929,1433,1459]" class="Mammalia" family="Leptictidae" genus="Palaeictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="species" species="nitidus">
<emphasis id="B95BEA9FFB249C58FD4831F28BBDFA2F" box="[708,929,1433,1459]" italics="true" pageId="32" pageNumber="33">Palaeictops nitidus</emphasis>
</taxonomicName>
, and the only specimen referable to
<taxonomicName id="4C2F4D0EFB249C58FE8B31D48964FA44" authorityName="Gazin" authorityYear="1949" box="[263,376,1471,1496]" class="Mammalia" family="Leptictidae" genus="Hypictops" higherTaxonomySource="GBIF" kingdom="Animalia" order="Pilosa" pageId="32" pageNumber="33" phylum="Chordata" rank="genus">
<emphasis id="B95BEA9FFB249C58FE8B31D48964FA44" box="[263,376,1471,1496]" italics="true" pageId="32" pageNumber="33">Hypictops</emphasis>
</taxonomicName>
is too badly worn to allow positive identification. It seems best to resist the action of synonymy in these cases.
</paragraph>
</subSubSection>
</treatment>
</document>