Summary of acestridium |
Identification | Acestridium was diagnosed by Schaefer (1991) based on the following characters: ten principal caudal-fin rays; plates at anterior snout margin forming conspicuous spatulate projection; head and body very slender, depressed; dorsal surface of head and trunk with longitudinal ridges; dorsal fin placed posteriorly, well beyond pelvic fin and just anterior to anal-fin origin; adipose fin absent; dermal plates anterior to first dorsal-fin proximal radial expanded, bearing ventromedial keel contacting the dorsal margin of the neural arches of the vertebrae six through twelve; and ridge of bone on the ventral surface of the lateral ethmoid contacting the metapterygoid channel reflected mesially. |
Size | Smallest 50mm, largest 67mm, average 61mm, most commonly 63mm. All SL. |
Species | There are 9 "species" in the database |
Keepers | 4 species (44%) are being kept by registered keepers |
New spp. / time |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1750 | 1770 | 1790 | 1810 | 1830 | 1850 | 1870 | 1890 | 1910 | 1930 | 1950 | 1970 | 1990 | 2010 |
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Distribution |
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