Glirodon: Difference between revisions

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{{Short description|Extinct family of mammals}}
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{{Automatic Taxobox
<table border="1" cellspacing="0" align="right" cellpadding="2">
| name = ''Glirodon''
<tr><th align="center" bgcolor="pink"><b><i>Glirodon</i></b></th></tr>
| fossil_range = [[Late Jurassic]]
<tr><td>
| display_parents = 2
</td></tr>
| taxon = Glirodon
<tr><th align="center" bgcolor="pink">'''[[Scientific classification]]'''</th></tr>
| authority = Engelmann and Callison, 1999
<tr><td>
| subdivision_ranks = Species
<table align="center"><tr>
| subdivision =
<td>[[Kingdom (biology)|Kingdom]]: </td><td>[[Animal]]ae </td></tr>
''G. grandis''
<tr>
}}
<td> </td><td>[[Therapsida]] </td></tr>
<tr>
<td>[[Class (biology)|Class]]: </td><td>[[Mammalia]] </td></tr>
<tr>
<td>[[Order (biology)|Order]]: </td><td>[[Multituberculata]]</td></tr>
<tr>
<td>[[Family (biology)|Family]]: </td><td>Affinities unclear</td></tr>
</table>
<tr><th align="center" bgcolor="pink">'''[[Species|Species]]'''</th></tr>
<tr><td>
&nbsp;&nbsp;<b><i>G. grandis</i></b><br>
<br>
</tr></td>
<tr><td>Ref. </tr></td>
</table>


<b><i>Glirodon</i></b> is an extinct mammal of the Upper [[Jurassic]]. It was a relatively early member of the also extinct order of [[Multituberculata]], suborder "[[Plagiaulacida]]". It lived in North America during the 'age of the [[dinosaurs]]'.
'''''Glirodon''''' is a [[genus]] of extinct [[mammal]] from the Upper [[Jurassic]]. It was a relatively early member of the also-extinct order of [[Multituberculata]], suborder "[[Plagiaulacida]]". These mammals lived in [[North America]] during the Mesozoic, also known as the "age of the [[dinosaur]]s".


Genus: <b><i>Glirodon</i></b> Engelmann GF & Callison G, 1999<br>
The genus ''Glirodon'' has been described by Engelmann G.F. and Callison G. (1999) from a 'gliriform tooth'.
'gliriform tooth'<p>


⚫
The [[species]] ''Glirodon grandis'', also described by Engelmann and Callison, has been found in the Upper Jurassic formations of [[Dinosaur National Monument]] in [[Utah]] (United States). Other than being a large, early American Multituberculate, (see [[Multituberculata]]), the nature of this beast is somewhat unclear. It is an "allodontid (two families and the genus ''Glirodon'')", (Kielan-Jaworowska and Hurum, 2001). It had gliriform [[incisor]]s; incisors with the "enamel reduced to a stripe on the front side." Apparently, this condition evolved several times among Multituberculates.
Species: <b><i>Glirodon grandis</i></b> Engelmann GF & Callison G, 1999<br>
Place: Dinosaur National Monument, Utah<br>
Country: USA<br>
Age: Upper [[Jurassic]]<br>
⚫
Remarks: Other than being a large, early American multituberculate, (see [[Multituberculata]]), the nature of this beast is somewhat unclear. It's an "allodontid (two families and the genus <b><i>Glirodon</i></b>)", (Kielan-Jaworowska & Hurum, 2001). It had gliriform incisors; incisors with the "enamel reduced to a stripe on the front side." Apparently, this condition evolved several times among multis. (Personal communication and with thanks for the info to David Marjanovic).<br>
⚫
It's based on a portion of snout. "<b><i>Glirodon</i></b> retains the plesiomorphic 'plagiaulacidan' ("[[Plagiaulacida]]") dental formula and shares with Allodontidae the structure of the upper premolars (Pl.1 fis 2-4). It differs from the Paulchoffatiidae and Plagiaulacidae in having a single-cusped I3," (Kielan-Jaworowska & Hurum, 2001, p.401-402). I3 refers to an upper incisor and 'plsiomorphic' means 'basal'.<br>
⚫
Reference: Engelmann & Callison, (1999), <b><i>Glirodon grandis</i></b>, a new multituberculate mammal from the Upper Jurassic Morrison Formation. Vertebrate Paleontology of Utah, pp.161-178, in Utah Geological Survey, (ed. Gillette DD), 8/99.<p>


⚫
It is based on a portion of snout. "''Glirodon'' retains the plesiomorphic 'plagiaulacidan' ("[[Plagiaulacida]]") [[dental formula]] and shares with [[Allodontidae]] the structure of the upper premolars (Pl.1 fis 2-4). It differs from the Paulchoffatiidae and Plagiaulacidae in having a single-cusped I3," (Kielan-Jaworowska & Hurum, 2001, p.&nbsp;401-402). I3 refers to an upper incisor and 'plesiomorphic' means 'basal'.
⚫
Page reference: Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p.389-429.<p>


Present in stratigraphic zones 4 and 6.<ref name="foster-appendix">Foster, J. (2007). "Appendix." ''Jurassic West: The Dinosaurs of the Morrison Formation and Their World''. Indiana University Press. pp. 327–329.</ref>
⚫
(This information has been derived from [http://home.arcor.de/ktdykes/plagiau.htm] MESOZOIC MAMMALS; Basal Multituberculata, an internet directory. As that's my webpage, there are no issues of copyright.)

== References ==
⚫
* Engelmann & Callison, (1999), Glirodon grandis, ''a new multituberculate mammal from the Upper Jurassic Morrison Formation''. Vertebrate Paleontology of Utah, pp.&nbsp;161–178, in the Utah Geological Survey, (ed. Gillette DD), 8/99.
⚫
* Kielan-Jaworowska Z & Hurum JH (2001), ''Phylogeny and Systematics of multituberculate mammals''. Paleontology 44, p.&nbsp;389–429.
⚫
* Most of this information has been derived from [https://web.archive.org/web/20110514101729/http://home.arcor.de/ktdykes/plagiau.htm] MESOZOIC MAMMALS; Basal Multituberculata, an Internet directory.
{{Reflist}}
{{Allotheria|A.}}
{{Taxonbar|from=Q612635}}

[[Category:Multituberculates]]
[[Category:Morrison mammals]]
[[Category:Fossil taxa described in 1999]]
[[Category:Prehistoric mammal genera]]


{{jurassic-mammal-stub}}

Latest revision as of 13:12, 21 September 2021

Glirodon
Temporal range: Late Jurassic
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: †Multituberculata
Suborder: †Plagiaulacida
Family: †incertae sedis
Genus: †Glirodon
Engelmann and Callison, 1999
Species

G. grandis

Glirodon is a genus of extinct mammal from the Upper Jurassic. It was a relatively early member of the also-extinct order of Multituberculata, suborder "Plagiaulacida". These mammals lived in North America during the Mesozoic, also known as the "age of the dinosaurs".

The genus Glirodon has been described by Engelmann G.F. and Callison G. (1999) from a 'gliriform tooth'.

The species Glirodon grandis, also described by Engelmann and Callison, has been found in the Upper Jurassic formations of Dinosaur National Monument in Utah (United States). Other than being a large, early American Multituberculate, (see Multituberculata), the nature of this beast is somewhat unclear. It is an "allodontid (two families and the genus Glirodon)", (Kielan-Jaworowska and Hurum, 2001). It had gliriform incisors; incisors with the "enamel reduced to a stripe on the front side." Apparently, this condition evolved several times among Multituberculates.

It is based on a portion of snout. "Glirodon retains the plesiomorphic 'plagiaulacidan' ("Plagiaulacida") dental formula and shares with Allodontidae the structure of the upper premolars (Pl.1 fis 2-4). It differs from the Paulchoffatiidae and Plagiaulacidae in having a single-cusped I3," (Kielan-Jaworowska & Hurum, 2001, p. 401-402). I3 refers to an upper incisor and 'plesiomorphic' means 'basal'.

Present in stratigraphic zones 4 and 6.[1]

References[edit]

  • Engelmann & Callison, (1999), Glirodon grandis, a new multituberculate mammal from the Upper Jurassic Morrison Formation. Vertebrate Paleontology of Utah, pp. 161–178, in the Utah Geological Survey, (ed. Gillette DD), 8/99.
  • Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p. 389–429.
  • Most of this information has been derived from [1] MESOZOIC MAMMALS; Basal Multituberculata, an Internet directory.
  1. ^ Foster, J. (2007). "Appendix." Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 327–329.


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