Skip to main content
×
Home
    • Aa
    • Aa

First occurrence of Orthotheca Novák, 1886 (Hyolitha, Early Devonian) in North America

  • John M. Malinky (a1)
Abstract

Family Orthothecidae Sysoev, 1958 is herein emended to encompass only hyoliths that possess a very shallow longitudinal ventral concavity and a tightly rounded dorsum, resulting in a near-triangular to only slightly kidney-shaped cross section. Orthotheca Novak, 1886 is restricted to orthothecids that possess longitudinal ornamentation on the dorsum, with Cryptocaris suavis Barrande, 1872 now recognized as the type species of that genus. Based on the revised generic concept, orthothecids from the Lower Devonian (Emsian) Shriver Chert of northeastern Pennsylvania are here 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 to retract the operculum into the shell when closed probably aided in preventing sediment influx, and the ventral furrow may have been an adaptation to differing degrees of firmness of the underlying substrate. Despite faunal linkages between the Devonian paleocontinents, the majority of orthothecid genera seem to be largely restricted to their type areas, although Orthotheca documented herein has eroded slightly their endemic character.

Copyright
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

S. T. Barrett 1876. Notes on the lower Helderberg rocks of Port Jervis, New York, with descriptions of a new pteropod. Annals of the Lyceum of Natural History, New York, 11:290299.

V. Berg-Madsen and J. M. Malinky 1999. A revision of Holm's Late Mid and Middle Cambrian hyoliths of Sweden. Palaeontology, 42:841885.

E. S. Cobbold 1921. The Cambrian horizons of Comley (Shropshire) and their Brachiopoda, Pteropoda, Gasteropoda, etc. Quarterly Journal of the Geological Society of London, 76:325386.

L. R. M. Cocks and T. H. Torsvik 2002. Earth geography from 500 to 400 million years ago: A faunal and paleomagnetic review. Journal of the Geological Society of London, 159:631644.

J. O. R. Ebbestad and J. S. Peel 1997. Attempted predation and shell repair in Middle and Upper Ordovician gastropods from Sweden. Journal of Paleontology, 71:10071019.

T. Groom 1902. The sequence of the Cambrian and associated beds of the Malvern Hills. Quarterly Journal of the Geological Society of London, 58:89135.

J. P. Hodych and K. I. Buchan 1998. Paleomagnetism of the ca. 440 Ma Cape St. Mary's sills of the Avalon Peninsula of Newfoundland: implications for Iapetus Ocean closure. Geophysical Research International, 135:155164.

J. M. Malinky 1988. Early Paleozoic Hyolitha from North America: Reexamination of Walcott's and Resser's type specimens. Journal of Paleontology, 62(2):218233.

J. M. Malinky 2002. A revision of early to Mid Ordovician hyoliths from Sweden. Palaeontology, 45:511555.

J. M. Malinky 2003a. Ordovician and Silurian hyoliths and gastropods reassigned from the Hyolitha from the Girvan District, Scotland. Journal of Paleontology, 77:625645.

J. M. Malinky 2003b. New Middle and Late Ordovician hyoliths from Estonia. Journal of Paleontology, 77:304313.

J. M. Malinky 2006. Revision of Hyolitha from the Ordovician of Estonia. Paläontologische Zeitschrift, 80:88106.

J. M. Malinky and V. Berg-Madsen 1999. A revision of Holm's Early and early Middle Cambrian hyoliths of Sweden. Palaeontology, 42:2565.

L. Marek and P. E. Isaacson 1992. Devonian hyoliths from Bolivia. Journal of Paleontology, 66:2428.

L. Marek , J. M. Malinky , and G. Geyer 1997. Middle Cambrian fossils from Tizi n' Tichka, the High Atlas, Morocco. Pt. 2. Hyolitha. Journal of Paleontology, 71:638656.

F. R. C. Reed 1909. Lower Palaeozoic Hyolithidae from Girvan. Transactions of the Royal Society of Edinburgh, 47:203222.

B. N. Runnegar 1980. Hyolitha: status of the phylum. Lethaia, 13:2125.

B. N. Runnegar , J. Pojeta , N. J. Morris , J. D. Taylor , M. E. Taylor , and G. McClung 1975. Biology of the Hyolitha. Lethaia, 8:181191.

P. W. Signor III, M. A. S. McMenamin , D. A. Gervirtzman , and J. F. Mount 1983. Two new pre-trilobite faunas from western North America. Nature, 303:415418.

P. W. Signor , J. F. Mount , and B. R. Onken 1987. A pre-trilobite fauna from the White-Inyo region of eastern California and western Nevada. Journal of Paleontology, 61:425438.

E. L. Yochelson 1987. Redescription of Spirodentalium (Gastropoda) from the Late Cambrian of Wisconsin. Journal of Paleontology, 61:6669.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
  • URL: /core/journals/journal-of-paleontology
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Altmetric attention score

Abstract views

Total abstract views: 54 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 19th August 2017. This data will be updated every 24 hours.