Late Carboniferous bryozoans from La Hermida, Spain
Author
Ernst, Andrej
Author
Minwegen, Elke
text
Acta Palaeontologica Polonica
2006
51
3
569
588
journal article
10.5281/zenodo.13652021
1732-2421
13652021
Fistulipora petaloida
Schulga−Nesterenko, 1955
Fig. 3A–C
;
Table 1
.
| N |
X |
SD |
CV |
MIN |
MAX |
| aperture width |
14 |
0.35 |
0.043 |
12.498 |
0.27 |
0.42 |
| lunaria length |
4 |
0.15 |
0.055 |
36.515 |
0.09 |
0.21 |
| lunaria width |
4 |
0.26 |
0.024 |
9.127 |
0.24 |
0.29 |
| vesicular diameter |
20 |
0.09 |
0.026 |
27.801 |
0.05 |
0.13 |
| number of vesicles per 1 mm vertically |
6 |
13.38 |
1.139 |
8.512 |
12 |
15 |
| number of apertures per 2 mm |
6 |
3.42 |
0.539 |
15.754 |
2.5 |
4.0 |
1955
Fistulipora petaloida
sp. nov
;
Schulga−Nesterenko 1955: 70–71
, pl. 7: 2, text−fig. 3e.
Material
.—Two fragments
SMF
1737, 1759.
Description
.—Encrusting colony, commonly multilayered. Single sheets reaching
0.63 to 1.13 mm
in thickness. Autozooecial apertures rounded to oval, spaced 2.5–4.0 in
2 mm
on the colony surface in growth direction, separated usually by 1–2 rows of vesicles. Lunaria prominent,
0.21–0.29 mm
wide and
0.09–0.21 mm
long. Basal diaphragms thin, horizontal or slightly inclined, usually
1–2 in
each autozooecium. Vesicles polygonal in cross−section, having rounded roofs in longitudinal section, spaced
9–10 in
1 mm
colony thickness. Outer granular skeleton well developed, bearing small abundant styles.
Discussion
.—This species is similar to
Dybowskiella
(?=
Fistulipora
)
lebedevi
Nikiforova, 1933
from the Lower Carboniferous of the
Donetsk
Basin,
Ukraine
. However, the latter species has distinctly smaller lunaria
—0.075
–0.100
versus
0.090
–0.210
mm
long and
0.210
–0.290
mm
wide in
Fistulipora petaloida
.
Table 2. Measurements of
Coscinium hermidensis
sp.nov.
N, number of measurements; X, mean; SD, standard deviation; CV, coefficient of variation; MIN, minimum value; MAX, maximum value.
| N |
X |
SD |
CV |
MIN |
MAX |
| aperture width |
20 |
0.16 |
0.012 |
7.749 |
0.14 |
0.19 |
| branch width |
4 |
3.19 |
0.598 |
18.751 |
2.63 |
4.00 |
| branch thickness |
5 |
1.95 |
0.372 |
19.095 |
1.63 |
2.40 |
Fig. 2. Lithofacies of the investigated profile at La Hermida, Spain.
Stratigraphic and geographic range
.—Moscow River, Russian Plate; Kasimovian Stage, Upper Carboniferous. Picos de Europa Formation, Moscovian, Upper Carboniferous; La Hermida,
Spain
.