Biceratopsinae

Biceratopsinae Temporal range: Toyonian (Upper Olenellus-zone) 516–513 Ma PreЄ Є O S D C P T J K Pg N ↓
Emigrantia sp., a cephalon
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Suborder:	Olenellina
Superfamily:	Olenelloidea
Family:	Biceratopsidae
Subfamily:	Biceratopsinae (Pack & Gayle, 1971)[1]
Genera
Biceratops Pack & Gayle, 1971 (Type) Bolbolenellus Palmer and Repina, 1993 Emigrantia nomen nudum Eopeachella Webster, 2009 Nephrolenellus Palmer and Repina, 1993[2] Olenelloides (Peach, 1894) Paranephrolenellus Webster, 2007[3] Peachella (Walcott, 1910)

The Biceratopsinae is an extinct subfamily of trilobites, fossil marine arthropods, with species of small to average size. Species belonging to this subfamily lived during the Toyonian stage (Upper Olenellus-zone), 516-513 million years ago, in the former continent of Laurentia, including what are today the South-Western United States and Canada.^[4]

Etymology

The Biceratopsinae are named for the type species Biceratops nevadensis.

Habitat

The Biceratopsinae were probably marine bottom dweller, like all Olenellina.

References

1. Lieberman, B.S. (1999). "Systematic Revision of the Olenelloidea (Trilobita, Cambrian)" (PDF). Bulletin of the Peabody Museum of Natural History 45.
2. M., Webster (2007). "Ontogeny and evolution of the early Cambrian trilobite genus Nephrolenellus (Olenelloidea)". Journal of Paleontology 81: 1168–1193. doi:10.1666/06-092.1.
3. Webster, M. (2007). "Paranephrolenellus, a New Genus of Early Cambrian Olenelloid Trilobite". Memoirs of the Association of Australasian Palaeontologists 34: 101–130.
4. Pack, P.D.; Gayle, H.B. (2009). "A New Olenellid Trilobite, Biceratops nevadensis, from the Lower Cambrian near Las Vegas, Nevada". Journal of Paleontology 45 (5). pp. 893–898.