Llandoverian (Early Silurian) Radiolarians From the Road River Formation of East-Central Alaska and the New Family Haplotaeniatumidae

Won, Mun-Zu; Blodgett, Robert B.; Nestor, Viiu

doi:10.1666/0022-3360(2002)076<0941:lesrft>2.0.co;2

Cited by 25 publications

(58 citation statements)

References 12 publications

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“…Won et al (2002) discuss the variability in primary units, and similar to MacDonald (1998), point out that some units lack a spine protruding from the center. Won et al (2002) furthermore propose emendations to Rotasphaeridae that we do not adopt because they would restrict its definition to exclude the genera Diparvipila MacDonald 1998 and Rotasphaera Noble 1994. Dumitrica et al (2000) treat Rotasphaeridae as a junior synonym to Secuicollactidae, apparently based on an incorrect attribution of Secuicollactidae to Nazarov andOrmiston 1984.…”

Section: Systematic Descriptionsmentioning

confidence: 63%

“…The proloculus of the Haplotaeniatumidae (Won et al 2002) is a tiny network of bars at the center of the radiolarian from which beams protrude (text- fig. 5).…”

Section: Terminologymentioning

confidence: 99%

“…8;MacDonald 1998;Noble and Maletz, 2000), and 2) primary units, sensu MacDonald (1998) where the radiating rods (called primary bars) fuse into the shell and do not become spines. Won et al (2002) note that not all primary units appear to have a spine emanating from the center. Spines that emanate from the center of a primary unit are called primary spines, whereas spines of lesser size not emanating from a primary unit are called secondary spines.…”

Section: Terminologymentioning

confidence: 99%

“…Recent work has demonstrated the utility of Silurian radiolarians for both local and global biostratigraphic purposes. Studies from Eurasia (Nazarov and Ormiston 1993), the Canadian Arctic (Goodbody 1981(Goodbody , 1982(Goodbody , 1986MacDonald 1998MacDonald , 1999MacDonald , 2003MacDonald , 2004MacDonald , 2006, Japan (Furutani 1990, Wakamatsu et al 1990), the United States (Noble 1994;Won et al 2002;Noble et al 1998) and Sweden (Noble and Maletz 2000) demonstrate a global distribution of some Silurian radiolarians. The aforementioned studies, utilized for biostratigraphic work, are constrained by the small number of field sites worldwide and known to contain sufficiently well-preserved radiolarians with continuous stratigraphic coverage.…”

Section: Introductionmentioning

confidence: 99%

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Sheinwoodian (uppermost Lower Silurian) Radiolaria from the Cape Phillips Formation, Nunavut, Canada

Jones

Noble

2006

Micropaleontology

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Radiolarians from the C. perneri-M. opimus graptolite Zone (Sheinwoodian; Wenlock) are described from a section in the Cape Phillips Formation, Nunavut, Canada, with a focus on the spherical radiolarian component (Archaeospicularia, Entactinaria, and Spumellaria). Three new genera, Involutentactinia, Perforentactinia, and Franklinia are described and the genera Labyrinthospahera, Gyrosphaera, and Haplotaeniatum are emended. Ten new species are described: Involutentactinia eccentra n. sp., containing two varieties; Involutentactinia eccentra n. sp. sensu strictu, and I. eccentra cupressa n. var.; Magnentactinia ostentata n. sp., Perforentactinia excepta n. sp., Plussatispila aethra n. sp., Franklinia tricae n. sp., F. dipulvisphaera, n. sp., Haplotaeniatum vertigospongum, n. sp., Gyrosphaera cavea n. sp., Labyrinthosphaera lancia, n. sp., and Labyrinthosphaera ? lenzi n. sp. Haplotaenitaumiids and entactiniids are dominant and respectively, comprise as much as 35% and 20% percent of the fauna in some samples. Secuicollactines represent a small but persistent component. Inaniguttids, formerly thought to be a dominant portion of upper Sheinwoodian faunas, are represented by only one inaniguttid species, P. aethra, which makes up between 0.5 to 18% of the fauna. This first detailed glimpse at the upper Sheinwoodian revises the ranges of two biostratigraphically important taxa: the first appearance of Inanihella tarangulica group taxa occurs above the C. perneri-M. opimus Zone and the last appearance of Haplotaeniatum is within the C. perneri-M. opimusZone. Revisions to the existing radiolarian biozonation of Noble and Aitchison are proposed; the Long-spined inaniguttid 2 zone now extends through the C. perneri -M. opimus Zone encompassing this fauna, and the base of the Long-spined inaniguttid 3 Zone is redefined and moved to the base of the Homerian.

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Section: Systematic Descriptionsmentioning

confidence: 63%

“…The proloculus of the Haplotaeniatumidae (Won et al 2002) is a tiny network of bars at the center of the radiolarian from which beams protrude (text- fig. 5).…”

Section: Terminologymentioning

confidence: 99%