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Amphechinus major
Taxonomy
Amphechinus major was named by Ziegler et al. (2007). Its type specimen is NHMW 2005z0198/0001, a tooth (M1 sup. dext.), and it is not a trace fossil. Its type locality is DEL-B/12, Valley of Lakes, Central Mongolia, which is in an Oligocene terrestrial horizon in the Hsanda Gol Formation of Mongolia.
Sister species lacking formal opinion data
Synonymy list
Year | Name and author |
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2007 | Amphechinus major Ziegler et al. p. 104 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Amphechinus major Ziegler et al. 2007
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Diagnosis
Reference | Diagnosis | |
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R. Ziegler et al. 2007 | Medium-sized Amphechinus-species with well developed metaconules in most of the M1, and moderately developed metaconules in most of the M2. It is distinctly larger than A. minutissimus, and A. taatsiingolensis from the same region. It differs from A. microdus from the Early Miocene of Kazakhstan in the bigger size of m1, m3 and M2 and in the presence of metaconules on M1 and M2. It differs from A. bohlini from the Early Miocene of the Junggar Basin, China, in the longer p4, the smaller m1 and m2, in the bigger m3 and in the more anterior position of the mental foramen. All the other Amphechinus species from North America, Europe, Africa and Asia cannot be confused, because they are much bigger. |
Measurements
No measurements are available
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Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
References: Nowak 1991, Lillegraven 1979, Carroll 1988, Hendy et al. 2009, Ji et al. 2002 |
Age range: Late/Upper Oligocene or 28.40000 to 23.03000 Ma
Collections (12 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Late/Upper Oligocene | Mongolia | Amphechinus major (type locality: 75599 75602 176447 182080 182143 183913) | |
Late/Upper Oligocene | Mongolia (Övörkhangai) | Amphechinus major (182076 182078 182082 182085 183914) | |
Late/Upper Oligocene - Early/Lower Miocene | Mongolia (Övörkhangai) | Amphechinus major (180969) |