Biology:Pachycormidae

Pachycormidae Temporal range: Late Triassic to Late Cretaceous
Size chart of notable genera
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	†Pachycormiformes
Family:	†Pachycormidae Woodward, 1895
Genera
Asthenocormus Bonnerichthys Eugnathides Euthynotoides Euthynotus Hypsocormus Leedsichthys Ohmdenia Orthocormus Pachycormus Prosauropsis Protosphyraena Rhinconichthys Sauropsis Saurostomus

Pachycormidae is an extinct family of ray-finned fish known from Mesozoic deposits from Eurasia and the Americas. They were characterized by having serrated pectoral fins (though more recent studies demonstrated that fin shape diversity in this group was high), reduced pelvic fins and a bony rostrum. Certain members of the group were large filter-feeding planktivores. Their relations with other fish are unclear.

Phylogeny

Cladogram after Friedman et al. (2010).

†Pteronisculus     †Discoserra pectinodon           †Watsonulus eugnathoides       †Macrepistius rostratus       †Caturus     Amia calva             Lepisosteus platostomus       †Macrosemius rostratus       †Semionotus elegans     †Lepidotes                 †Pholidophorus bechei       Elops hawaiensis     Hiodon alosoides        Pachycormidae    †Euthynotus         †Hypsocormus insignis       †"Hypsocormus" tenuirostris       †Orthocormus       †Australopachycormus hurleyi     †Protosphyraena               †Pachycormus         †Asthenocormus titanius     †Martillichthys renwickae         †Bonnerichthys gladius       †Leedsichthys problematicus     †Rhinconichthys taylori

Gallery

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  Pachycormus

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  Leedsichthys

Sources/external links

• http://www.courtenaymuseum.ca/paleo/paleo/pachycor.html
• https://web.archive.org/web/20081025044133/http://www.palaeos.com/Vertebrates/Units/100Neopterygii/100.600.html
• http://www.sciencemag.org/cgi/data/327/5968/990/DC1/1

References

Wikidata ☰ Q141216 entry