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Orthotheca shriveri

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Journal Article

FIRST OCCURRENCE OF ORTHOTHECA NOVÁK, 1886 (HYOLITHA, EARLY DEVONIAN) IN NORTH AMERICA

JOHN M. MALINKY
Published: 01 July 2009
Journal of Paleontology (2009) 83 (4): 588–596.
DOI: https://doi.org/10.1666/08-164R.1
... included within the genus as Orthotheca shriveri n. sp., making this the first occurrence of the genus in North America. The Orthothecida were a group of sessile, benthic hyoliths that ranged from Early Cambrian to Early Devonian. Their life habit appeared to have included filter-feeding. Their ability...
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Figure 2. 1–9. Orthotheca shriveri n. sp. 1, paratype SMP 7385, external mold of dorsum showing operculum (in relief) remaining in place in aperture and septae in apical region, ×2; 2–3, holotype SMP 7381, 2, external mold of dorsum showing operculum (in relief) remaining in place in aperture, and external mold of dorsum showing operculum (in relief) in place in aperture, photographed from slightly below the plane of the operculum, both ×2; 4, 9, paratype SMP 8135, magnified view of apertural region of dorsum, and venter, both ×2; 5, paratype SMP 7387, external mold of venter with fragment of internal mold remaining, ×2; 6, paratype SMP 7386, distorted conch with portion of dorsum exposed on left side of specimen and venter visible on right side, ×2; 7, paratype SMP 7390, external mold of dorsum, ×2; 8, paratype SMP 8136; external mold of venter(?), ×2.

Figure 2. 1–9 . Orthotheca shriveri n. sp. 1 , paratype SMP 7385, exter...

Published: 01 July 2009
Figure 2. 1–9 . Orthotheca shriveri n. sp. 1 , paratype SMP 7385, external mold of dorsum showing operculum (in relief) remaining in place in aperture and septae in apical region, ×2; 2–3 , holotype SMP 7381, 2 , external mold of dorsum showing operculum (in relief) remaining in place