Prosopium
| Prosopium | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Round white fish ( Prosopium cylindraceum ) |
||||||||||||
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Prosopium | ||||||||||||
| Jordan , 1878 |
Prosopium is a genus of freshwater fish from the order of the salmon-like (Salmoniformes).
features
Prosopium are silver to silver-white colored salmon fish with a round body cross-section. When viewed from above, its small snout is compressed, its mouth below it. There is a single flap of skin between the nostrils. On the first gill arch there are 13 to 45 short, strong gill spines , the jaws are edentulous. The dorsal fin is supported by 10 to 14 fin rays, the caudal fin is forked. Young animals (Parrs) carry Parr drawing.
Jordan differentiates Prosopium from Coregonus as follows :
“ Supraorbital (area above the eye) short, broadly ovoid, cap-like; Preorbital (in front of the eye, snout area) comparatively short and wide; Upper jaw short and rather broad, not reaching to the eye line; additional bone (of the upper jaw) small, narrow and pointed elliptical ; Mouth very small, muzzle more or less extended. "
Systematics and research history
The genus Prosopium forms the subfamily Coregoninae within the salmon family together with Coregonus and Stenodus .
David Starr Jordan reviewed a James W. Milner manuscript on the Coregonids in 1878 and concluded that the specimens on which the review was based belonged to four well-defined groups, at least three of which could be considered genera or subgenera. Prosopium is also assigned to Milner, to whom Jordan expressly thanks in his work, but Prosopium appears for the first time in Jordan in a printed work, so that Jordan is considered the author of Prosopium . The distinction between Prosopium and Coregonus was temporarily not noticed or recognized until Koelz (1929) raised prosopium from a subgenus to a genus. In the years that followed, prosopium continued to be viewed as a subgenus, until, according to Walters (1955), prosopium was established as a genus because of the single skin flap between the nostrils and the Parr drawing of the young .
Types and distribution
The genus includes six species. Three of these species are widespread in North America, partly also in eastern Siberia, especially in mountain rivers and lakes. The other three species are endemic of the Bear Lake on the border of the US states, Idaho and Utah .
- Prosopium abyssicola (endemic to Bear Lake)
- Prosopium coulterii - dwarf white fish
- Prosopium cylindraceum - Round white fish
- Prosopium gemmifer (endemic to Bear Lake)
- Prosopium spilonotus (endemic to Bear Lake)
- Prosopium williamsoni - mountain whitefish
Web links
- Prosopium on Fishbase.org (English)
- Prosopium in the Interagency Taxonomic Information System (English)
Individual evidence
- ↑ Lawrence M. Page, Brooks M. Burr: Peterson Field Guide to Freshwater Fishes. Houghton Mifflin Harcourt, 2011, ISBN 978-0547242064 , pp. 44-45.
- ↑ a b David Starr Jordan: Manual of the vertebrates of the northern United States, including the district east of the Mississippi River, and north of North Carolina and Tennessee, exclusive of marine species. ( Online )
- ^ Walter Koelz: Coregonid Fishes of the Great Lakes. 1929. ( online )
- ^ Donald A. Normandeau: The Life history of the round whitefish Prosopium cylindraceum (Pallas) of Newfound Lake, New Hampshire. 1963. Doctoral Dissertations. 789. ( online )
- ^ Scientific Names where Genus Equals Prosopium. In: www.fishbase.org. Accessed April 19, 2019 .
- ^ Prosopium abyssicola on Fishbase.org (English). Retrieved April 19, 2019.
- ↑ Prosopium coulterii on Fishbase.org (English). Retrieved April 19, 2019.
- ↑ Prosopium cylindraceum on Fishbase.org (English). Retrieved April 19, 2019.
- ↑ Prosopium gemmifer on Fishbase.org (English). Retrieved April 19, 2019.
- ↑ Prosopium spilonotus on Fishbase.org (English). Retrieved April 19, 2019.
- ^ Prosopium williamsoni on Fishbase.org (English). Retrieved April 19, 2019.