Acdestoides praecursor (lat.) Is a species of extinct marsupial mammals from the Palaeothentidae family, unique in the genus Acdestoides . It is known from the remains found initially in the upper Oligocene (Desead) rocks of the province of Chubut ( Argentina ), and later in the same place - in the Lower Miocene (Colueap) [1] .
| † Acdestoides praecursor |
| Scientific classification |
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| No rank : | Bilateral symmetric |
| Superfamily : | † Palaeothentoidea |
| Rod: | † Acdestoides Bown et Fleagle, 1993 |
| View: | † Acdestoides praecursor |
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| International Scientific Name |
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Acdestoides praecursor ( Loomis , 1914 ) |
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Content
The species was first described by Loomis in 1914 according to the holotype AC 3020 - a fragment of the right side of the lower jaw with the second molar (M 2 ). The crowns of the third premolar (P 3 ) and the first molar M 1 were subsequently, already after the description, lost [2] . At various times, the species was attributed to the genera Callomenus and Palaeothentes [3] , until in 1993 Bown and Fleagle separated it into a separate genus Acdestoides [4] .
Synonyms
- Callomenus praecursor Loomis, 1914
- Acdestis praecursor (Loomis, 1914) - a combination created by Pascual and Odreman Rivas in 1971
- Palaeothentes praecursor (Loomis, 1914) - a combination created by Patterson and Marshall in 1978 [2]
Quite the largest of the well-known representatives of the Palaeothentidae family [4] .
Unlike Acdestis , M 2 has a greater ratio of length and width, slightly longer entochristid, deeper hypoflexid, and posterior lingo-anteroluboral-oriented postvallid [4] .
Unlike Acdestodon bonapartei , in it M 2 has a small paraconid, anterior-labial-posterior-lingual (and not perpendicular-) oriented protocristid, a larger ratio of length and width, longer entocristid and deeper hypoflexide [4] .
Unlike Trelewthentes rothi , M 2 has a greater length-width ratio, a longer entochristis (covering the talonid pool from the lingual side), a deeper hypoflexide and anterior-labial-posterior-lingual (rather than front-labial-labially) directional postvallid [4] .