Coscinium cyclops Keyserling, 1846
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publication ID |
https://doi.org/ 10.4202/app.2008.0078 |
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persistent identifier |
https://treatment.plazi.org/id/03A47E57-7E62-A107-C46A-FCC54E8AF918 |
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treatment provided by |
Felipe |
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scientific name |
Coscinium cyclops Keyserling, 1846 |
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Coscinium cyclops Keyserling, 1846 View in CoL
Figs. 6A–E, 8A, 10H View Fig .
Material examined.—Measurements based on 10 zoaria in the following samples: Hyrnefjellet (scree), thin sections PMO 170.892A−B, as well as 11 thin sections from samples ZPAL Br. 12/H10, G16; Treskelen, sample ZPAL Br. 12/Cr. 55, thin section PMO 170.908B and one thin section ZPAL Br. 12/Cr. 55; Gipsvika, thin sections PMO 170.919A−G.
Description.—Bifoliate frondescent colonies with oval and circular fenestrules and anastomosing branches with zooecia opening on both sides of branches. The branches are lensshaped in cross section being bifoliate compressed perpendicular to branch surfaces. Width of branches varies between 2.86 and 3.00 mm, thickness 1.53–2.51 mm. The fenestrules are 2.00– 2.81 mm long and 1.66–1.92 mm wide. Vesicular, blister−like tissue is developed between autozooecial tubes. Massive stereom is developed near colony surface. Apertures are ovate in outline being 0.22–0.23 mm long and 0.16–0.20 mm wide. The apertures carry a weakly developed lunarium. There are about 3.5–5 apertures along colony per 2 mm and 4.5–5 diagonally. Distance between apertural centers is about 0.40–0.55 mm.
Remarks.—The current material, as well as previously described material from Gipsvika ( Nakrem 1994a) closely resemble the description and measurements of C. cyclops from the Asselian–Artinskian of Timan ( Morozova and Kruchinina 1986). Coscinium hermidensis Ernst and Minwegen 2006 , from the Late Carboniferous of Spain (Ernst and Minwegen 2006) differs from C. cyclops only in having slightly narrower fenestrules (0.9 mm wide) and may be a synonym of C. cyclops .
Measurements.—See Table 1.
Stratigraphic and geographic range.—First appearance in the late Asselian, more common in the Sakmarian–Artinskian of Timan−Pechora, Russia and Lower Permian the Urals ( Morozova and Kruchinina 1986). Occurrence on Svalbard:
. arbuscula cf sp... sp.. sp?
Kapp Formation Starostin GPS - N 77°00.851’ Sampling:. sp sp sp. sp. sp sterlitamakensis cyclops . sp ellesmerensis . cf
E 16°12.447’
68
66
70
-
-69
67
Rectifenestella Rhombotrypella Ascopora Penniretepora Goniocladia Rhombopora Archimedes Rhabdomeson Dyscritella Polypora Ascopora Coscinium Fistulipora Tabulipora . Timanodictya sp
65
64
CL VI
63
62
61 59 58 60
57
56
55
54
53 CLV
Formation PERMIAN 52 50
49 -51
Treskelodden EARLY 44 48 43 47 45-46
42
41 CL III
39
40
38
37
36
35
34 CL II
33
32
30-31 1 m 29
28 CLI
Kapp Formation Starostin
GPS - N
E
7
16
7
°
°
11.134
01.507
’
’
Sampling
44
49
50
45
48
:
-
-
47
. sp
svalbardense . nov ellesmerensis
. cf
sp. disposita cf. cyclops sp.
sp
.
sp
.
41 42
40
43
Ascopora Ascopora Tabulipora Timanodictya Penniretepora Coscinium Rhombopora Dyscritella Ascopora Goniocladia
39 38
37
36
34-35
33
32
31
30
28-29
26
27
24 25
21 22 23
20
18 17
19 16
15
14
13
12
11
10
9
8
7
6
5
4
3 1 m
Asselian–early Sakmarian, middle−upper part of the Tyrrellfjellet Member, and the Treskelodden Formation.
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