ENSIKLOPEDIA

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Olenellidae

Extinct family of trilobites

Olenellidae Temporal range: Botomian/Toyonian (Olenellus-zone) PreꞒ Ꞓ O S D C P T J K Pg N

Olenellus fowleri
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Clade:	†Artiopoda
Class:	†Trilobita
Order:	†Redlichiida
Suborder:	†Olenellina
Superfamily:	†Olenelloidea
Family:	†Olenellidae Walcott, 1890
Subfamilies
Olenellinae Mesonacinae

Olenellidae is an extinct family of redlichiid trilobite arthropods. Olenellids lived during the late Lower Cambrian (Botomian/Toyonian) in the Olenellus-zone in the former paleocontinent of Laurentia^[1] and parts of what became the Famatinian orogen in what is now Argentina.^[2] This family can be distinguished from most other Olenellina by the partial merger of the frontal (L3) and middle pair (L2) of lateral lobes of the central area of the cephalon, that is called glabella, creating two isolated slits.^[1]

1	The angle in the back rim of the cephalon is less than 15°. Genal spines are reaching back no further than the 6th thorax segment. Spine on the 15th thorax segment almost as wide as the axis.^[1] → Olenellinae
-	The angle in the back rim of the cephalon is more than 25°. Genal spines are reaching back at least to the 8th thorax segment. spine on the 15th thorax segment less than half as wide as the axis.^[1] → Mesonacinae

1 2 3 4 Lieberman, B.S. (1999). "Systematic Revision of the Olenelloidea (Trilobita, Cambrian)" (PDF). Bulletin of the Peabody Museum of Natural History. 45. Archived from the original (PDF) on 2019-05-09. Retrieved 2012-10-30.
↑ Dalla Salda, Luis H.; Dalziel, Ian W.D.; Cingolani, Carlos A.; Varela, Ricardo (1992). "Did the Taconic Appalachians continue into southern South America?". Geology. 20 (12): 1059–1062. Bibcode:1992Geo....20.1059D. doi:10.1130/0091-7613(1992)020<1059:dttaci>2.3.co;2. S2CID 128856492.

Taxon identifiers
Olenellidae	Wikidata: Q1224048 Wikispecies: Olenellidae CoL: DK8 EoL: 4324381 GBIF: 4636103 IRMNG: 116130 Open Tree of Life: 4705279 Paleobiology Database: 90394

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