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Showing results for tags 'hypsiprisca'.
Found 5 results
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Juvenile Priscacara can be easily distinguished from juvenile Hypsacantha by their distinctly rounder body shape. Grande distinguishes two forms of Hypsiprisca: Hypsiprisca hypsacantha (originally described by Cope in 1886 under the name Priscacara hypsacantha) and a second yet undescribed, closely related form Hypsiprisca sp. H. sp. is more common than H. hypsacantha: H. sp. are mostly very small individuals less than 60mm long. Quotation L. Grande (2013): "The second species that remains undescribed differs from H. hypsacantha in being more slender-bodied and having a more convex posterior tail fin margin (H. hypsacantha has a very slightly forked tail margin)." References: Whitlock, J. (2010). Phylogenetic relationships of the Eocene percomorph fishes †Priscacara and †Mioplosus Journal of Vertebrate Paleontology Volume 30 – Issue 4, pages 1037-1048. Grande, L. T. (2013). The Lost World of Fossil Lake: Snapshots from Deep Time. University of Chicago Press. ISBN: 13: 978-0-226-92296-6.
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- eocene
- green river fm
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From the album: Vertebrates
Hypsipriscaca hypsacantha (Cope, 1866) Eocene Ypresian Green River Formation Nunn's Quarry USA -
Found this 2.5 inch fish earlier this month at a fossil quarry in Kemmerer. I think the dorsal fin structure more closely resembles the relatively rare Hypsiprisca rather than Amphiplaga, but any opinions are welcome. The head preservation is not optimal. I've provided a close-up photo of the lower section of the head, which appears to show sharp teeth.
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I have difficulties to find out what this small fish (1.8" or 4,5cm) from the Eocene GRF is. A baby Priscacara or Cockerellites? Or is it a Hypsiprisca hypsacantha? Or one of these so far (?) undescribed Priscacara species? The tail fin seems to be very, very slightly forked (almost round) and the Praeoperculum bears some spines. So I would guess Hypsiprisca hypsacantha, but I am not sure. Who can help? Thanks Thomas
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Grande distinguishes two forms of Hypsiprisca: Hypsiprisca hypsacantha (originally described by Cope in 1886 under the name Priscacara hypsacantha) and a second yet undescribed, closely related form Hypsiprisca sp. H. sp. is more common than H. hypsacantha; H. sp. are mostly very small individuals less than 60mm long. Quotation L. Grande (2013): "The second species that remains undescribed differs from H. hypsacantha in being more slender-bodied and having a more convex posterior tail fin margin (H. hypsacantha has a very slightly forked tail margin)." References: Whitlock, J. (2010) Phylogenetic relationships of the Eocene percomorph fishes †Priscacara and †Mioplosus Journal of Vertebrate Paleontology Volume 30 – Issue 4, pages 1037-1048. Grande, L. T (2013) The Lost World of Fossil Lake: Snapshots from Deep Time. University of Chicago Press. ISBN: 13: 978-0-226-92296-6.
