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Taxonomy
Illaenus stenorhachis was named by Harrington (1938). Its type specimen is CPBA 4165 and is a 3D body fossil.
It was recombined as Illaenopsis stenorhachis by Harrington and Leanza (1957); it was recombined as Asaphellus stenorhachis by Meroi Arcerito et al. (2015) and Tortello and Esteban (2016).
It was recombined as Illaenopsis stenorhachis by Harrington and Leanza (1957); it was recombined as Asaphellus stenorhachis by Meroi Arcerito et al. (2015) and Tortello and Esteban (2016).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1938 | Illaenus stenorhachis Harrington p. 182 figs. pl. 5, fig. 18 |
| 1957 | Illaenopsis stenorhachis Harrington and Leanza p. 183 figs. 93.3; non figs 93.1, 2, 4. |
| 2015 | Asaphellus stenorhachis Meroi Arcerito et al. p. 141 |
| 2016 | Asaphellus stenorhachis Tortello and Esteban pp. 141 - 142 figs. 8A-M, 9A |
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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.
†Asaphellus stenorhachis Harrington 1938
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. F. Tortello and S. B. Esteban 2016 | Exoskeleton elongated and elliptical, about 70% longer than wide. Cranidium smooth, glabella almost indistinct laterally, preglabellar furrow ill-defined, convex forward. Genal spines widely based, and short (about 20% of free cheek maximum length). Pygidial border flat to slightly concave, wider anteriorly than posteromedially, barely defined axis in the anterior third of the pygidium. |
Measurements
No measurements are available
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| Source: g = genus, f = family, o = order, c = class | |||||
| References: Hendy et al. 2009, Hendy 2009, Aberhan et al. 2004 | |||||
Age range: Tremadocian or 485.40000 to 477.70000 Ma
Collections (13 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Tremadocian | Argentina | Asaphellus stenorhachis (208292 208294) | |
| Tremadocian | Argentina (Jujuy) | Asaphellus sp. (136916 136917 136934 136935 136937 136938) | |
| Tremadocian | Argentina (Salta) | Asaphellus stenorhachis (208301 208302 208306 208308 208309) |