| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Placosema
Taxonomy
Placosema was named by Opik (1967) [Sepkoski's age data: Cm uMid-u Cm Dres-l Sepkoski's reference number: 16,482]. It is not extant.
It was synonymized subjectively with Genevievella by Jell and Adrain (2002).
It was assigned to Ptychopariida by Sepkoski (2002); and to Onchonotininae by Peng et al. (2004).
It was synonymized subjectively with Genevievella by Jell and Adrain (2002).
It was assigned to Ptychopariida by Sepkoski (2002); and to Onchonotininae by Peng et al. (2004).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1967 | Placosema Opik |
| 2002 | Placosema Sepkoski |
| 2004 | Placosema Peng et al. p. 68 |
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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
No diagnoses are available
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Aberhan et al. 2004, Whittington et al. 1997 | |||||
Age range: base of the Mindyallan to the top of the Paibian or 499.00000 to 494.20000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Guzhangian | China (Hunan) | P. bigranulosum (49187) | |
| Mindyallan | Australia (Queensland) | P. caelatum (77515) | |
| Paibian | China (Hunan) | P. bigranulosum (49195 126130 126131) | |
| Furongian | South Korea | P. bigranulosum (236863 236864 236865) |