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Marsaisia
Taxonomy
Marsaisia was named by Hupé (1953) [Sepkoski's age data: Cm Atda-u Sepkoski's reference number: 473]. It is not extant.
It was synonymized subjectively with Richterops by Jell and Adrain (2002); it was misspelled as Marcaisia by Sepkoski (2002), Geyer (2020).
It was assigned to Trilobita by Sepkoski (2002); and to Despujolsiidae by Geyer (2020).
It was synonymized subjectively with Richterops by Jell and Adrain (2002); it was misspelled as Marcaisia by Sepkoski (2002), Geyer (2020).
It was assigned to Trilobita by Sepkoski (2002); and to Despujolsiidae by Geyer (2020).
Species lacking formal opinion data
Synonymy list
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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. †Marsaisia Hupé 1953
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. Geyer 2020 | Lateral glabellar simple, slightly obliquely rearward directed from axial furrow; posterior tips of palpebral lobes moderately long; eye ridges tapering forward, curved; preglabellar field (sag. and exsag.) absent; anterior border narrow to moderately wide. Thorax composed of 12, 13 or predominantly 14 segments; tr. length of pleurae smaller than width axis in the anterior and middle part of the thorax, slightly growing in length rearward but without distinctly extended pleura or macrospinose segment. Pygidium subsemicircular to spathulate in outline, posterior margin regularly curved or with slight indentation on sagittal line; with three or four axial rings and equal number of pleural rings; axis with small terminal axial piece; lateral border relatively narrow, tapering rearward. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Hendy et al. 2009, Aberhan et al. 2004 | |||||
Age range: Atdabanian or 521.00000 to 516.00000 Ma
Collections (4 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Atdabanian | Morocco (Ant-Atlas) | M. robauxi (6275 96224 232863 232864) |