The genus' name derives from the Greekεχινό (echino) meaning spiny, and chimaera. It is assigned to the orderChimaeriformes.[1] it a relative of ratfish
Both species have rounded bodies and paddle-like tails as well as large pectoral fins, two dorsal fins and a jaw fused to the braincase.[4] The paddle-like tails indicate that E. meltoni was likely not a predator nor a fast swimmer.[5][6]
Echinochimaera meltoniedit
Specimen of Echinochimaera meltoni
E. meltoni was first described by Richard Lund, an Adelphi Universitypalaeontologist,[7] in 1977.[1][3] The fossils found of E. meltoni have shown a great deal of sexual dimorphism, males being found to have a maximum 150mm body length while the maximum body length found in females was only 70mm (juveniles were 13-20mm). In general, the females only grew to about half the size of the males.[5] Males also had four pairs of spikes which may have been used to defend against predators and to identify the fish as male.[6]
There was a relative abundance of immature male fossils found, and that together with the significant sexual dimorphism indicate there was extreme sexual selection among the species.[5]
Echinochimaera snyderiedit
E. snyderi was described, like E. meltoni, by Richard Lund. It was described in 1988 based on juvenile specimens, all with a body length under 90mm. E. snyderi differs from E. meltoni in fin detail as well as jaw shape and teeth near the front edge of the face rather than a tooth plate, in mature specimens later found its mature size was found to be larger than E. meltoni.[8]
^ ab"The Taxonomican: Genus Echinochimaera". Retrieved 2009-09-25.
^ ab. 2007-11-01. Archived from the original on 2010-06-28. Retrieved 2009-09-26.
^. Discovery Education. Archived from the original on 2009-12-10. Retrieved 2009-10-11.
^ abcLund, Richard (1990). "Chondrichthyan life history styles as revealed by the 320 million years old Mississippian of Montana". Environmental Biology of Fishes. 27 (1). Springer Netherlands: 1–19. doi:10.1007/BF00004900. ISSN 1573-5133.
^ ab. 2006-02-01. Archived from the original on 2012-02-12. Retrieved 2015-12-09.
^. 2006-11-16. Archived from the original on 2010-01-08. Retrieved 2009-09-27.
^. Archived from the original on 2010-07-29. Retrieved 2009-09-26.
April 10, 2024
echinochimaera, prickly, chimera, extinct, genus, chimaeriform, fish, known, from, lower, carboniferous, bear, gulch, limestone, montana, united, states, earliest, chimaeriformes, known, temporal, range, upper, mississippian, preꞒ, specimen, meltonia, diorama,. Echinochimaera prickly chimera is an extinct genus of chimaeriform fish known from the Lower Carboniferous Bear Gulch Limestone in Montana United States It is one of the earliest Chimaeriformes known EchinochimaeraTemporal range Upper Mississippian 318 1 328 3 Ma PreꞒ Ꞓ O S D C P T J K Pg N Specimen of Echinochimaera meltoniA diorama of EchinochimaeraScientific classificationKingdom AnimaliaPhylum ChordataClass ChondrichthyesSubclass HolocephaliOrder ChimaeriformesSuborder EchinochimaeroideiFamily EchinochimaeridaeGenus EchinochimaeraLund 1977 1 Species Echinochimaera meltoni 2 Echinochimaera snyderi 2 Contents 1 Taxonomy 1 1 Species 1 1 1 Echinochimaera meltoni 1 1 2 Echinochimaera snyderi 2 ReferencesTaxonomy editThe genus name derives from the Greek exino echino meaning spiny and chimaera It is assigned to the order Chimaeriformes 1 it a relative of ratfish Species edit The two known Echinochimaera species lived in the Upper Mississippian Serpukhovian 3 Fossils of the species were found in the Bear Gulch Limestone in Montana United States Both species have rounded bodies and paddle like tails as well as large pectoral fins two dorsal fins and a jaw fused to the braincase 4 The paddle like tails indicate that E meltoni was likely not a predator nor a fast swimmer 5 6 Echinochimaera meltoni edit nbsp Specimen of Echinochimaera meltoniE meltoni was first described by Richard Lund an Adelphi University palaeontologist 7 in 1977 1 3 The fossils found of E meltoni have shown a great deal of sexual dimorphism males being found to have a maximum 150mm body length while the maximum body length found in females was only 70mm juveniles were 13 20mm In general the females only grew to about half the size of the males 5 Males also had four pairs of spikes which may have been used to defend against predators and to identify the fish as male 6 There was a relative abundance of immature male fossils found and that together with the significant sexual dimorphism indicate there was extreme sexual selection among the species 5 Echinochimaera snyderi edit E snyderi was described like E meltoni by Richard Lund It was described in 1988 based on juvenile specimens all with a body length under 90mm E snyderi differs from E meltoni in fin detail as well as jaw shape and teeth near the front edge of the face rather than a tooth plate in mature specimens later found its mature size was found to be larger than E meltoni 8 References edit a b c The Paleobiology Database Retrieved 2009 09 25 a b The Taxonomican Genus Echinochimaera Retrieved 2009 09 25 a b University of Montana Paleontology Center 2007 11 01 Archived from the original on 2010 06 28 Retrieved 2009 09 26 Search for Ancient Sharks Discovery Education Archived from the original on 2009 12 10 Retrieved 2009 10 11 a b c Lund Richard 1990 Chondrichthyan life history styles as revealed by the 320 million years old Mississippian of Montana Environmental Biology of Fishes 27 1 Springer Netherlands 1 19 doi 10 1007 BF00004900 ISSN 1573 5133 a b Fossil Fishes of Bear Gulch Echinochimaera meltoni 2006 02 01 Archived from the original on 2012 02 12 Retrieved 2015 12 09 Bear Gulch About Richard Lund 2006 11 16 Archived from the original on 2010 01 08 Retrieved 2009 09 27 Fossil Fishes of Bear Gulch Echinochimaera snyderi Archived from the original on 2010 07 29 Retrieved 2009 09 26 Retrieved from https en wikipedia org w index php title Echinochimaera amp oldid 1214084808, wikipedia, wiki, book, books, library,
