| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Biceratopsidae
Taxonomy
Biceratopsidae was named by Lieberman (1998) [Lieberman (1998) says he raises Biceratopsinae from subfamily to Biceratopsidae, and also includes within it a subfamily Biceratopsinae. Biceratopsinae was originally created as a subfamily, so I'm giving the family to Lieberman (1998)].
It was assigned to Olenelloidea by Lieberman (1998), Lieberman (1999), Webster (2007).
It was assigned to Olenelloidea by Lieberman (1998), Lieberman (1999), Webster (2007).
Synonymy list
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
Fm. †Biceratopsidae Lieberman 1998
show all | hide all
G. †Bolbolenellus Palmer and Repina 1993
hide
†Bolbolenellus altifrontatus Fritz 1972
†Bolbolenellus brevispinus Palmer 1998
†Bolbolenellus dodoensis Handkamer et al. 2022
†Bolbolenellus euryparia Palmer and Halley 1979
†Bolbolenellus groenlandicus Poulsen 1927
†Bolbolenellus hermani Kindle and Tasch 1948
†Bolbolenellus sphaerulosus Fritz 1991
Subfm. †Bristoliinae Palmer and Repina 1993
hide
G. †Bristolia Harrington 1956
+
†Bristolia anteros Palmer and Halley 1979
†Bristolia bristolensis Resser 1928
†Bristolia colberti Gapp and Lieberman 2014
†Bristolia fragilis Palmer and Halley 1979
†Bristolia harringtoni Lieberman 1999
†Bristolia insolens Resser 1928
†Bristolia mohavensis Hazzard and Crickmay 1933
G. †Lochmanolenellus Lieberman 1998
+
†Lochmanolenellus mexicana Lochman 1952
†Wanneria mexicana prima Lochman 1952
G. †Nephrolenellus Palmer and Repina 1993
hide
†Nephrolenellus geniculatus Palmer 1998
†Nephrolenellus multinodus Palmer and Halley 1979
+
Invalid names: Nephrolenellus jasperensis Lieberman 1999 [synonym]
G. †Paranephrolenellus Webster 2007
hide
†Paranephrolenellus besti Webster 2007
†Paranephrolenellus inflatus Webster 2007
†Paranephrolenellus klondikensis Webster 2007
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. D. Pack and H. B. Gayle 1971 | Exoskeleton subovate. Glabella subcylindrical, contracted at middle with axial furrows indistinct and lateral furrows absent or indistinct. Well defined border. Genal spines absent; genal angles rounded Thorax consists of 15 prothoracic segments 10 or more opisthothoracic segments. The third prothoracic segment is very strongly macropleural. | |
| A. R. Palmer and L. N. Repina 1993 | Olenellidae with glabella narrowest at midlength; glabellar furrows very poorly developed; trans- verse width of LI less than transverse width of occipital ring. Ocular lobes close to glabella; posterior tips opposite or anterior to Li. Genalspines absent or opposite midlength of ocular lobes. Intergenal spines absent; intergenal angle may be developed. Thorax divided into prothorax and opistbothorax; third segment strongly expanded distally and pleural spine extremely long, tips posterior to body; 15th segment with long axial spine. |