Journal article
A late Miocene channel catfish (Siluriformes, Ictaluridae, Ictalurus) from the St. Marys Formation, Calvert Cliffs, Maryland, USA
Notulae Naturae of the Academy of Natural Sciences of Philadelphia, Vol.485
May 2012
Abstract
Fossil remains of a catfish from the Late Miocene St. Marys Formation, Maryland, are described as a new, extinct species of Ictalurus (Ictaluridae). The holotype of Ictalurus countermani n. sp., is a three-dimensional partial skull, Weberian complex, pectoral girdle and fin spine. Referred paratype specimens include isolated mesethmoid, premaxilla, dorsal-fin spine and cleithrum. Ictalurus countermani n. sp., is distinguished among congeneric species by a combination of features of the sphenotic, cleithrum and pectoral-fin spine. The new species extends the known native geographic range of Ictalurus onto the mid-Atlantic slope and indicates extirpation of the genus from that region before the recent transplantation of the channel (I. punctatus) and blue (I. furcatus)catfishes. Fossils of gar (Lepisosteus) and bowfin (Amia) associated with I. countermani corroborate the likely freshwater environment at or near the site of their burial. An additional catfish fin spine collected with the foregoing is identified as an ariid sea catfish, cf. Ariopsis felis.
Metrics
1 Record Views
Details
- Title
- A late Miocene channel catfish (Siluriformes, Ictaluridae, Ictalurus) from the St. Marys Formation, Calvert Cliffs, Maryland, USA
- Creators
- John G. Lundberg - Academy of Natural Sciences of Philadelphia, Department of Ichthyology Philadelphia, PA USA United StatesKyle R. Luckenbill
- Publication Details
- Notulae Naturae of the Academy of Natural Sciences of Philadelphia, Vol.485
- Publisher
- Academy of Natural Sciences of Philadelphia
- Number of pages
- 32
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Academy of Natural Sciences of Drexel University
- Identifiers
- 991019335225504721