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Eolacertidae
Taxonomy
Eolacertidae was named by Čerňanský and Smith (2017). Its type is Eolacerta.
It was assigned to Lacertiformes by Čerňanský and Smith (2017).
It was assigned to Lacertiformes by Čerňanský and Smith (2017).
Subtaxa
Eolacerta (syn. Iguanosauriscus, Iguanosaurus) (type genus), Stefanikia
Synonymy list
Year | Name and author |
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2017 | Eolacertidae Čerňanský and Smith |
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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. †Eolacertidae Čerňanský and Smith 2017
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Diagnosis
Reference | Diagnosis | |
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A. Čerňanský and K. T. Smith 2017 | Shares with Lacertidae the following plesiomorphies: (1) osteoderms absent from body, (2) parietal foramen present, (3) sulcus dentalis present.
Shares with Lacertidae the following derived features: (1) two co-dominant supraoculars; (2) osteodermal shields fused to the dermal roofing skull bones; (3) occipital shield clearly defined; (4) osteoderms present along periphery of the skull table; (5) nasals ventral contact beneath premaxillary internasal process is absent, except near apex; (6) the maxilla-frontal con- tact present, the maxilla leaving a discrete facet on the frontal; (7) ectopterygoid posterior process prominent; (8) presence of incipient zygosphene-zygantrum; (9) a posterior interruption of the ventromedial loop of the clavicle (assuming Gallotiinae is basal in Lacertidae); (10) preacetabular spine on ilium present. Possesses the following plesiomorphies with respect to Lacertidae: (1) interparietal shield of the parietal overlaps the posteromedial region of the frontal; (2) parietal foramen located more anteriorly, in the anterior quarter of the parietal; (3) parietal cranial crests (cristae cranii parietalis) run parallel rather than converging to form a median ridge with sulcus; (4) supratem- poral fenestra only partially closed; (5) ornamentation of cranial osteoderms dominated by small grooves (not pits); (6) ventral margin of dentary nearly straight rather than convex; (7) anter- olateral process of coronoid does not overlap dentary; (8) ilium is broad, relatively posterodorsally short. Synapomorphies: (1) osteoderm attached to angle of jugal; (2) frontals (partially) fused; (3) origin of adductor musculature dorsal on supratemporal process; (4) partial overlap of parietal by postfrontal; (5) Meckelian groove restricted; (6) angular reaches level of mandibular condyle. |
Measurements
No measurements are available
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Source: c = class, subp = subphylum, uc = unranked clade | |||||
References: Carroll 1988, Hendy et al. 2009 |
Age range: base of the Thanetian to the top of the Late/Upper Eocene or 59.20000 to 33.90000 Ma
Collections (19 total)
Time interval | Ma | Country or state | Original ID and collection number |
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Thanetian | France (Champagne-Ardenne) | Eolacerta sp. (87925) | |
Ypresian | France (Aude) | Eolacerta sp. (182641) | |
Ypresian | France (Marne) | Eolacerta sp. (35533 35535 35539) | |
Ypresian | France (Oise) | Eolacerta sp. (68174) | |
Ypresian | Belgium (Brabant) | Eolacerta sp. (35531) | |
MP 10 | France (Picardie) | Eolacerta robusta (68440) | |
MP 8 + 9 | France (Picardie) | Eolacerta sp. (84997) | |
MP 11 | Germany (Hessen) | Stefanikia siderea (120798) | |
Lutetian | Germany (Sachsen-Anhalt) | Eolacerta robusta (45001 45751 45768 45770) Eolacerta robusta, Iguanosauriscus haupti (13322 45002) Iguanosauriscus haupti (45765 45766) | |
Late/Upper Eocene | Germany (Sachsen-Anhalt) | Eolacerta robusta (45003) |