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Hemistreptacron
Taxonomy
Hemistreptacron was named by Yakovlev (1926) [Sepkoski's age data: P l P Guad-u]. It is not extant. Its type is Hemistreptacron abrachiatum.
It was assigned to Acariaiocrininae by Arendt (1970); to Streblocrininae by Ubaghs et al. (1978); to Acariaiocrinidae by Arendt (1981); and to Cladida by Sepkoski (2002).
It was assigned to Acariaiocrininae by Arendt (1970); to Streblocrininae by Ubaghs et al. (1978); to Acariaiocrinidae by Arendt (1981); and to Cladida by Sepkoski (2002).
Species
H. abrachiatum (type species), H. tchatlykense
Synonymy list
| Year | Name and author |
|---|---|
| 1926 | Hemistreptacron Yakovlev |
| 1970 | Hemistreptacron Arendt p. 170 |
| 1978 | Hemistreptacron Ubaghs et al. p. T603 |
| 1981 | Hemistreptacron Arendt p. 98 |
| 2002 | Hemistreptacron Sepkoski |
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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.
G. †Hemistreptacron Yakovlev 1926
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†Hemistreptacron abrachiatum Yakovlev 1926
†Hemistreptacron tchatlykense Arendt 1970
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: subc = subclass, c = class, p = phylum | |||||
| References: Aberhan 1992, Hendy et al. 2009, Kiessling 2004 | |||||
Age range: Artinskian or 290.10000 to 283.30000 Ma
Collections (5 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Artinskian | Russian Federation | H. abrachiatum (90764 101527 101531 101532) H. tchatlykense (242074) |