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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Halirhachis
Taxonomy
Halirhachis was named by Zhan and Jin (2005). Its type is Halirhachis leonina.
It was assigned to Taffiidae by Zhan and Jin (2005).
It was assigned to Taffiidae by Zhan and Jin (2005).
Species
H. leonina (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2005 | Halirhachis Zhan and Jin p. 377 figs. 10A-I |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. Zhan and J. Jin 2005 | Shell small, concavoconvex, semicircular, parvicostellate. Dental plates thin, short, low; ventral muscle field small, bilobed; a small platform immediately anterior to muscle field, undercut anteriorly, supported by high, thick median ridge limited to visceral area; pair of short, antero−laterally divergent ridges present in posterior part of shell. Cardinal process simple ridge, discrete from thick, widely divergent socket ridges; platform well−developed, tilting antero−ventrally above valve floor in medial part; median ridge high, thick. |
Measurements
No measurements are available
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| Source: o = order, c = class, p = phylum, uc = unranked clade | |||||
| References: Nesnidal et al. 2013, Aberhan et al. 2004 | |||||
Age range: Darriwilian or 467.30000 to 458.40000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Darriwilian | China (Yunnan) | H. leonina (54187) |