Olenellidae
From Infogalactic: the planetary knowledge core
| Olenellidae |
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| File:Olenellus fowleri CRF.jpeg | |
| Olenellus fowleri | |
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Olenellidae
Walcott, 1890
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| Subfamilies | |
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The Olenellidae are a family of trilobites, a group of extinct marine arthropods. They lived during the late Lower Cambrian (Botomian/Toyonian) in the so-called Olenellus-zone in the former paleocontinent of Laurentia[1] plus 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]
Key to the subfamilies
| 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 |
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| - | 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 |
