TABLE 1. Coefficients of Variation (CV) of OPC values for Hoploscaphites spedeni and H. nebrascensis whole shells and separated body chambers and phragmocones of both sexual dimorphs. Note the higher CV for H. spedeni macroconch body chambers and the much smaller CV for H. nebrascensis macroconch body chambers. This reduction in variation may indicate strong selectivity on the body chamber from H. spedeni to subsequent H. nebrascensis.
|
Species |
Dimorph |
n |
CV Whole Shell |
CV Body Chamber |
CV Phragmocone |
|
H. spedeni |
|||||
|
macroconch |
19 |
26.58 |
34.92 |
26.00 |
|
|
microconch |
20 |
24.94 |
28.61 |
28.35 |
|
|
H. nebrascensis |
|||||
|
macroconch |
5 |
14.05 |
11.02 |
31.7 |
|
|
microconch |
5 |
26.16 |
22.95 |
38.80 |
TABLE 2. Comparisons and results of the Mann-Whitney U test for equality of median surface-to-planimetric area ratios. Comparisons were made of body chambers and phragmocones between species and dimorphs of Hoploscaphites. Note that whole shell comparisons were not conducted due to the prohibitively large number of cells per raster. Analyses calculated statistically significant differences at the 95% confidence limit between the median area ratios for all specimens compared. Also note that for the H. spedeni macroconch body chambers, the most rotund, ornate specimens did not necessarily have the largest median cell values. This observation suggests that large changes may occur in late ontogenetic stages within this species.
|
Comparisons |
Specimen 1 Median Surface-to-Planimetric Area Ratio |
Specimen 2 Median Surface-to-Planimetric Area Ratio |
U* |
p (95%) |
|
H. spedeni macro body chamber: |
||||
|
typical vs rotund (ornate) |
1.105 |
1.101 |
200.95 |
< 0.01 |
|
typical vs compressed (smooth) |
1.105 |
1.056 |
25.33 |
< 0.01 |
|
H. spedeni macro phragmocone: |
||||
|
typical vs rotund (ornate) |
1.091 |
1.141 |
30.81 |
< 0.01 |
|
typical vs compressed (smooth) |
1.091 |
1.092 |
4.91 |
< 0.01 |
|
H. spedeni and H. nebrascensis macro body chamber: |
||||
|
rotund H. spedeni vs lowest H. nebrascensis |
1.101 |
1.054 |
44.61 |
< 0.01 |
|
rotund H. spedeni vs highest H. nebrascensis |
1.101 |
1.089 |
13.15 |
< 0.01 |
|
H. spedeni and H. nebrascensis macro phragmocone: |
||||
|
rotund H. spedeni vs lowest H. nebrascensis |
1.141 |
1.070 |
48.43 |
< 0.01 |
|
rotund H. spedeni vs highest H. nebrascensis |
1.141 |
1.109 |
23.17 |
< 0.01 |
|
H. nebrascensis macro body chamber: |
||||
|
lowest vs highest |
1.054 |
1.089 |
204.08 |
< 0.01 |
|
H. nebrascensis macro phragmocone: |
||||
|
lowest vs highest |
1.070 |
1.109 |
9.70 |
< 0.01 |
|
H. spedeni micro body chamber: |
||||
|
typical vs rotund (ornate) |
1.086 |
1.139 |
32.68 |
< 0.01 |
|
typical vs compressed (smooth) |
1.086 |
1.059 |
28.65 |
< 0.01 |
|
H. spedeni micro phragmocone: |
||||
|
typical vs rotund (ornate) |
1.120 |
1.129 |
9.56 |
< 0.01 |
|
typical vs compressed (smooth) |
1.120 |
1.092 |
21.27 |
< 0.01 |
|
H. spedeni and H. nebrascensis micro body chamber: |
||||
|
rotund H. spedeni vs lowest H. nebrascensis |
1.139 |
1.046 |
66.41 |
< 0.01 |
|
rotund H. spedeni vs highest H. nebrascensis |
1.139 |
1.100 |
26.30 |
< 0.01 |
|
H. spedeni and H. nebrascensis micro phragmocone: |
||||
|
rotund H. spedeni vs lowest H. nebrascensis |
1.129 |
1.073 |
42.12 |
< 0.01 |
|
rotund H. spedeni vs highest H. nebrascensis |
1.129 |
1.127 |
7.15 |
< 0.01 |
|
H. nebrascensis micro body chamber: |
||||
|
lowest vs highest |
1.046 |
1.100 |
41.50 |
< 0.01 |
|
H. nebrascensis micro phragmocone: |
||||
|
lowest vs highest |
1.073 |
1.127 |
33.16 |
< 0.01 |
