Halisaurus platyspondylus Marsh 1869
Description
HALISAURUS PLATYSPONDYLUS MARSH, 1869
Holotype: YPM 444, two vertebrae, an angular bone (originally described as a splenial) and a basicranium fragment described by Marsh (1869: 395) and figured by Baird (1986).
Type locality and horizon. New Egypt Formation, Late Maastrichtian (Late Cretaceous), near Hornestown, Monmouth County, New Jersey (USA).
Main referred specimens: NJSM 12146, incomplete cranium, Navesink Formation, Late Maastrichtian (Late Cretaceous), New Jersey (USA) (Wright, 1988); USNM 442450, incomplete skeleton, Severn Formation, middle Maastrichtian (Late Cretaceous), Maryland (USA) (Holmes & Sues, 2000).
Emended diagnosis: Autapomorphies: external naris strongly posteriorly inflated; prefrontal with large narial participation and posteriorly located supraorbital ridge; frontal with no anterior ridges; parietal with a smooth triangular table bearing circular foramen located at a distance its length from the suture; quadrate with a narrow and oblique stapedial notch; pterygoid with nine teeth and long palatine process at about 65∞ relative to the ectopterygoid process.
Notes
Files
Files
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Linked records
Additional details
Identifiers
Biodiversity
- Collection code
- NJSM , USNM
- Family
- Mosasauridae
- Genus
- Halisaurus
- Kingdom
- Animalia
- Material sample ID
- NJSM 12146 , USNM 442450
- Order
- Squamata
- Phylum
- Chordata
- Scientific name authorship
- Marsh
- Species
- platyspondylus
- Taxon rank
- species
- Taxonomic concept label
- Halisaurus platyspondylus Marsh, 1869 sec. Bardet, Suberbiola, Iarochene, Bouya & Amaghzaz, 2005
References
- Marsh OC. 1869. Notice of some new mosasauroid reptiles from the greensand of New Jersey. American Journal of Science 48: 392 - 397.
- Baird D. 1986. Halisaurus and Prognathodon, two uncommon mosasaurs from the Upper Cretaceous of New Jersey. The Mosasaur 3: 37 - 45.
- Wright KR. 1988. A new specimen of Halisaurus platyspondylus (Squamata: Mosasauridae) from the Navesink Formation (Maastrichtian) of New Jersey. Journal of Vertebrate Paleontology 8 (Suppl. 3): 29 A - 30 A.
- Holmes RB, Sues HD. 2000. A partial skeleton of the basal mosasaur Halisaurus platyspondylus from the Severn Formation (Upper Cretaceous: Maastrichtian) of Maryland). Journal of Paleontology 74: 309 - 316.