Toulapora svalbardense ( Nakrem, 1994a )
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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/03A47E57-7E65-A104-C43F-F9F9482BFEDD |
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treatment provided by |
Felipe |
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scientific name |
Toulapora svalbardense ( Nakrem, 1994a ) |
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Toulapora svalbardense ( Nakrem, 1994a) View in CoL
Fig. 9A–I View Fig .
1994a Hinaclema svalbardensis sp. nov.; Nakrem 1994a: 65–66, figs. 8D–H, 9.
1994b? Hinaclema sp. ; Nakrem 1994b: fig. 2d.
Type material: Holotype REF−4–15.0m, PMO A42600/1 (petrographic thin section); paratypes REF−4–15.0m, PMO 138.126 (rock specimen) and PMO A42600/2−4 (petrographic thin sections) all from the Rejmyrefjellet locality; thin sections PMO 170.941 and 170.942 from the Gipsvika (Sakmarian) locality.
Type locality: Rejmyrefjellet, Spitsbergen.
Type horizon: Gipshuken Formation, 15 m below the top of the formation, late Artinskian.
Material examined.—Measurements based on 9 zoaria in the following samples: Gipsvika (Sakmarian), thin sections PMO 170.929, 170.941, 170.942; Rejmyrefjellet (Artinskian), 15 m below top of the Gipshuken Formation, thin sections PMO A42600/1−4, 138.126. Oblique zoaria in a sample from the Tyrrellfjellet Member at Rejmyrefjellet were not measured (thin section 138.124).
Diagnosis.—As for genus.
Description (emended from Nakrem 1994a).—Zoarium encrusting, encrusting layer 0.44–0.80 mm in thickness. The endozone is indistinguishable from the exozone. The autozooecia meet zoarial surface at about 90 ° in longitudinal section (exozonal part); proximal (endozonal) portion of zooecia sometimes are oriented parallel to zoarial growth direction. Rare diaphragms observed in autozooecia, not in exilazooecial tubes. Zooecial walls are evenly thickened, not beaded, but at places crenulated; a dark central zone is visible in deep tangential section. The zooecial apertures are oval, 0.17–0.24 mm long and 0.13–0.17 mm wide. Distance between centers of adjacent apertures usually 0.24–0.30 mm in all directions. Abundant exilazooecia, average 0.038 mm long and 0.033 mm wide are developed between autozooecia. 12–16 small acanthostyles, average 0.014 mm in diameter are developed around each autozooecial aperture. Scattered larger acanthostyles average 0.075 mm in diameter; but up to 0.10 mm in shallowest section, are also developed, 0–3 per autozooecial aperture.
Measurements.—See Table 2. Stratigraphic and geographic range.—Sakmarian–late Artinskian, upper part of the Tyrrellfjellet Member of the Gipsvika section, and the upper part of the Gipshuken Formation of the Rejmyrefjellet section.
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