Marrolithus
| Marrolithus Temporal range: | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita |
| Order: | †Asaphida |
| Family: | †Trinucleidae |
| Genus: | †Marrolithus Bancroft, 1929 |
| Species | |
|
Marrolithus bureaui Oehlert, 1895 Marrolithus orthogonius Dean, 1967 | |
Marrolithus is an extinct genus of trinucleid trilobite that lived during the Ordovician period.
Palaeobiology
Ontogeny
During the meraspid period of ontogeny, the glabella of Marrolithus bureaui became compressed. During this ontogenetic stage, the species also developed a pronounced sub-quadrangular cephalic outline. The alae disappeared later on in development.
References
- ↑ "Marrolithus". Paleobiology Database. Retrieved 11 June 2026.
- ↑ Delabroye, Aurelien; Cronier, Catherine (July 2008). "Ontogeny of an Ordovician Trinucleid (Trilobita) from Armorica, France: A Morphometric Approach". Journal of Paleontology. 82 (4): 800–810. doi:10.1666/07-084.1. ISSN 0022-3360. Retrieved 11 June 2026 – via Cambridge Core.
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