River Sturgeons of the American Genus Scaphirhynchus: Characters, Distribution, and Synonymy

• Description: Papers of the Michigan Academy of Science, Arts, and Letters 1954 - related to the Platte River Endangered Species Partnership ‎(aka Platte River Recovery Implementation Program or PRRIP)‎
• State: CO
• State: NE
• State: WY
• Basin: South Platte
• Water Division: 1
• Date: 1/1/1953
• Author: Reeve M. Bailey & Frank B. Cross
• Title: River Sturgeons of the American Genus Scaphirhynchus: Characters, Distribution, and Synonymy ‎(Pallid Sturgeon)‎
• Water Supply Pro - Doc Type: Report/Study

Sturgeons of the Genus Seaph,irhynchus 189
' n:kers on the outer face of the lower half of the first branchial
ai �L Juan does S. album, a difference correctly noted by Forbes and
Richardson (1905). In album most of the rakers have a simple
dichotomy, but usually one or two rakers on each arch have 3 blunt
points. In platorynchus the rakers are more notably fanlike, and
14
r—
=13-22
B in JA
E= t.t-t.a
p laroryFlchus F =4.05.0
— -- - — =
IF= A=13 -25
C inD =t2-t5
3.6 -52
A\
D
{
23 -3.3
Bin
E =1.6 -20
JA=
F =5.5-70
GIbUm
A =26-3.7
Cin D =t6-24 ---
-
-
��-• -" -f ;`
-'ate -.
Y
Sturgeons of the Genus Seaph,irhynchus 189
' n:kers on the outer face of the lower half of the first branchial
ai �L Juan does S. album, a difference correctly noted by Forbes and
Richardson (1905). In album most of the rakers have a simple
dichotomy, but usually one or two rakers on each arch have 3 blunt
points. In platorynchus the rakers are more notably fanlike, and
14
r—
=13-22
B in JA
E= t.t-t.a
p laroryFlchus F =4.05.0
— -- - — =
IF= A=13 -25
C inD =t2-t5
3.6 -52
A\
D
{
A
B
s1 z
e
a
Fcc. 9. Comparative diagrams of the ventral surface of the head ii: ti:e species of
Scaphirhynchas, showing several measurement ratios of value for identification
most have either 3 or 4 blunt tips. Often one or two rakers on each
arc.i:.,,, ? or 5 points.
In Haso and in most species of _lcipenser the gillrakers are simple
and rodlike, not short and fan - shaped as in Scaphirhynchus. In
Pseudoscaphirhynchus kaufmanni (Bogdanow) the gillrakers are simi-
lar to those in Scaphirhynchus, though somewhat less strongly modi-
fiod. In P. fedtschenhoi (Kessler) and in P. hermanni (Kessler), how -
c , t ilo gillrakers are described as lancet- shaped, and in A. baeri
23 -3.3
Bin
E =1.6 -20
JA=
F =5.5-70
GIbUm
A =26-3.7
Cin D =t6-24 ---
-
A
B
s1 z
e
a
Fcc. 9. Comparative diagrams of the ventral surface of the head ii: ti:e species of
Scaphirhynchas, showing several measurement ratios of value for identification
most have either 3 or 4 blunt tips. Often one or two rakers on each
arc.i:.,,, ? or 5 points.
In Haso and in most species of _lcipenser the gillrakers are simple
and rodlike, not short and fan - shaped as in Scaphirhynchus. In
Pseudoscaphirhynchus kaufmanni (Bogdanow) the gillrakers are simi-
lar to those in Scaphirhynchus, though somewhat less strongly modi-
fiod. In P. fedtschenhoi (Kessler) and in P. hermanni (Kessler), how -
c , t ilo gillrakers are described as lancet- shaped, and in A. baeri