Olenidae | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Arthropoda |
Class: | †Trilobita |
Order: | †Ptychopariida |
Suborder: | †Olenina |
Superfamily: | †Olenoidea |
Family: | †Olenidae Burmeister, 1843 |
genera | |
see text |
Olenidae is a family of ptychopariid trilobites. Some genera, Balnibarbi and Cloacaspis, are thought to have evolved a symbiotic relationship with sulfur-eating bacteria from which they derived nutrition.[1]