| 词条 | Falcatus |
| 释义 |
| fossil_range = {{Fossil range|335|318}} Middle Viséan - Late Serpukhovian | image = Falcatus Vienna.jpg | image_caption = Specimen in Vienna | taxon = Falcatus | authority = Lund, 1985 | subdivision_ranks = Species | subdivision =
}} Falcatus is an extinct genus of Falcatidae which lived during the early Carboniferous Period in Bear Gulch bay and what is now Montana. DescriptionIt was a 25–30 cm or 10-12 inches long "cladodont-toothed stethacanthid shark" [1] The first material known from the genus were the prominent fin spines that curved anteriorly over the head of the animal. When first described in 1883 from the St. Louis Limestone, these remains were given the name Physonemus falcatus. However, in 1985, fossils of a new type of condrichthyan from Montana were described that displayed a high degree of sexual dimorphism. The same spines that were previously named P. falcatus were found on one of the morphs, identified as the male due to the presence of valvae. [2]References
1. ^{{cite web |url=http://www.sju.edu/research/bear_gulch/pages_fish_species/Falcatus_falcatus.php |title=Archived copy |accessdate=2008-09-04 |deadurl=yes |archiveurl=https://web.archive.org/web/20080821203413/http://www.sju.edu/research/bear_gulch/pages_fish_species/Falcatus_falcatus.php |archivedate=2008-08-21 |df= }} Fossil Fish of Bear Gulch 2005 by Richard Lund and Eileen Grogan Accessed 2009-01-14 2. ^The morphology of Falcatus falcatus (St. John and Worthen), a Mississippian stethacanthid chondrichthyan from the Bear Gulch Limestone of Montana. Journal of Vertebrate Paleontology 5(1):1-19. External links
3 : Symmoriida|Carboniferous fish of North America|Fossil taxa described in 1985 |
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