TABLE 1. Size measurements (length, width, and thickness) and spiral deviations from all analyzed specimens of the species Laqueus rubellus, Terebratula terebratula, Platystrophia ponderosa, and Pseudoatrypa sp.
| Specimen |
Length (mm) |
Width (mm) |
Thickness (mm) |
Dorsal minima |
Dorsal maxima |
Ventral minima |
Ventral maxima |
| L. rubellus 1
L. rubellus 2
L. rubellus 3
T. terebratula 1
T. terebratula 2
T. terebratula 3
P. ponderosa 1
P. ponderosa 2
P. ponderosa 3
Pseudoatrypa sp. 1
Pseudoatrypa sp. 2
Pseudoatrypa sp. 3
|
23.2
29.3
27.1
47.3
38.7
40.4
23.9
35.5
26.0
19.0
21.0
19.5
|
14.8
19.0
18.0
34.0
34.2
32.0
35.0
46.0
32.4
18.0
22.0
19.6
|
10.5
17.0
14.0
24.5
18.9
21.9
22.5
28.0
26.0
10.0
16.1
11.7
|
4
2
2
5
4
4
2
3
4
N/A
N/A
N/A
|
4
3
3
6
3
4
3
4
5
N/A
N/A
N/A
|
4
3
2
3
4
3
2
4
3
N/A
N/A
N/A
|
4
3
3
4
4
4
2
4
4
N/A
N/A
N/A
|
TABLE 2. Spiral output from three specimens of the species Laqueus rubellus. Maximum length is the maximum distance from the posterior to anterior region. Arc length is the maximum distance along the outline of the valve, from the posterior to anterior regions. Spiral axis (a) is the distance between the spiral axis and the first set of coordinates at the umbo. Spiral parameter (k) indicates the shape of the valve, where higher numbers represent flatter valves. Two spirals were fit to these shells, thus there were two spiral axes and parameters. Error is an indicator of how well the spirals fit the biological outline. The error from one spiral fitting was included as a comparison. N is the number of digitized points on the biological outline.
| Specimen |
Length (mm) |
Arc-length (mm) |
a1 |
a2 |
k1 parameter (spiral angle) |
k2 parameter (spiral angle) |
Error: two spirals (mm) |
Error: one spiral (mm) |
N |
| 1 Dorsal
1 Ventral
2 Dorsal
2 Ventral
3 Dorsal
3 Ventral
|
19.96
23.23
25.78
29.28
20.47
27.14
|
23.30
29.62
35.21
37.03
26.05
32.79
|
0.40
0.99
27.03
5.17
0.95
7.29
|
0.95
2.76
22.51
9.76
1.50
4.78
|
1.63 (31.5°)
1.20 (39.8°)
0.57 (60.3°)
0.77 (52.3°)
1.08 (42.7°)
0.40 (68.4°)
|
1.24 (38.9°)
0.79 (51.6°)
0.01 (89.2°)
0.45 (65.6°)
0.91 (47.7°)
0.67 (56.2°)
|
0.06
0.13
0.25
0.09
0.08
0.08
|
0.13
0.20
0.32
0.19
0.11
0.15
|
312
289
385
373
258
400
|
TABLE 3. Spiral output from three specimens of the species Terebratula terebratula (see caption for Table 2 for definitions and abbreviations).
| Specimen |
Length (mm) |
Arc-length (mm) |
a1 |
a2 |
k1 parameter (spiral angle) |
k2 parameter (spiral angle) |
Error: two spirals (mm) |
Error: one spiral (mm) |
N |
| 1 Dorsal
1 Ventral
2 Dorsal
2 Ventral
3 Dorsal
3 Ventral
|
39.25
47.25
33.17
38.69
34.47
40.39
|
46.41
58.04
37.80
49.52
41.09
50.50
|
1.84
5.60
3.52
5.28
2.08
6.82
|
2.70
6.68
1.51
2.47
0.89
15.07
|
1.40 (35.5°)
0.93 (47.0°)
1.05 (43.5°)
0.66 (56.5°)
-1.11 (-42.0°)
0.77 (52.4°)
|
1.19 (40.1°)
0.82 (50.8°)
1.51 (33.5°)
0.97 (45.8°)
-1.52 (-33.4°)
0.39 (68.6°)
|
0.12
0.08
0.14
0.11
0.14
0.09
|
0.15
0.10
0.30
0.29
0.21
0.23
|
514
343
247
459
355
391
|
TABLE 4. Spiral output from three specimens of the species Platystrophia ponderosa (see caption for Table 2 for definitions and abbreviations).
Specimen
(No./valve) |
Length
(mm) |
Arc-length
(mm) |
a1 |
a2 |
k1 parameter
(spiral angle) |
k2 parameter
(spiral angle) |
Error: two spirals
(mm) |
Error: one spiral
(mm) |
N |
| 1 Dorsal
1 Ventral
2 Dorsal
2 Ventral
3 Dorsal
3 Ventral
|
23.52
23.86
33.65
35.49
24.69
25.97
|
37.09
37.23
50.02
49.32
42.73
43.45
|
3.15
1.41
2.75
2.01
4.66
5.02
|
3.65
2.35
3.81
3.31
3.18
8.91
|
0.70 (55.1°)
0.80 (51.5°)
0.94 (46.9°)
0.89 (48.4°)
-0.45 (-65.7°)
0.51 (62.8°)
|
0.53 (62.2°)
0.63 (57.7°)
0.67 (56.1°)
0.72 (54.1°)
-0.59 (-59.7°)
0.29 (74.0°)
|
0.09
0.11
0.14
0.11
0.27
0.14
|
0.10
0.16
0.16
0.17
0.29
0.21
|
514
492
484
187
524
490
|
TABLE 5. Spiral output from three specimens of the species Pseudoatrypa sp. (see caption for Table 2 for definitions and abbreviations).
Specimen
(No./valve) |
Length
(mm) |
Arc-length (mm) |
a1 |
a2 |
k1 parameter
(spiral angle) |
k2 parameter
(spiral angle) |
Error: two spirals
(mm) |
Error: one spiral
(mm) |
N |
| 1 Dorsal
1 Ventral
2 Dorsal
2 Ventral
3 Dorsal
3 Ventral
|
18.60
19.02
20.52
21.03
19.38
19.54
|
24.07
22.18
34.03
29.82
30.17
25.94
|
4.58
8.43
5.30
16.34
3.30
10.88
|
6.27
9.63
9.26
17.65
9.32
23.04
|
-0.50 (-63.4°)
1.65 (31.3°)
0.39 (68.6°)
0.10 (84.0°)
0.69 (55.5°)
0.37 (69.5°)
|
-0.35 (-71.0°)
0.50 (63.4°)
0.17 (80.1°)
-0.34 (-71.1°)
0.23 (76.9°)
-0.18 (-79.6°)
|
0.08
0.13
0.11
0.10
0.12
0.15
|
0.10
0.16
0.15
0.16
0.22
0.22
|
474
438
628
557
497
419
|
