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Journal of Paleontology

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PALAEOSCENIDIIDAE (RADIOLARIA) FROM THE LOWER SILURIAN OF THE CAPE PHILLIPS FORMATION, CORNWALLIS ISLAND, NUNAVUT, CANADA

¹ Department of Earth Sciences, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada, (presently at Department of Earth Sciences, St. Francis Xavier University, Antigonish, Nova Scotia B2G 2W5, Canada, <ewmacdon{at}stfx.ca>)

Spicular radiolarians of the family Palaeoscenidiidae were recovered from the Llandovery to lower Wenlock of the Cape Phillips Formation, Nunavut, Canada. Several changes are made to the classification of these radiolarians. Goodbodium rarispinosum (Goodbody, 1986) was previously placed with Palaeoscenidium Deflandre, 1953. Insolitignum MacDonald, 1999 is emended to allow for additional apical rays. Insolitignum cancellatum (Goodbody, 1986) includes species which were previously assigned to Palaeoscenidium, Palaeotripus Goodbody, 1986, and Palaeoephippium Goodbody, 1986, owing to the variable development of one ray. Insolitignum peranima MacDonald, 1999 is synonymized with I. dissimile (Goodbody, 1986). Palaeodecaradium apertum (Goodbody, 1986) was previously placed with Palaeoscenidium; Palaeotripus nudus Goodbody, 1986 is considered a synonym of P. apertum. Palaeoephippium is rediagnosed based on the branching of the basal rays; the new diagnosis also allows for more than six rays and in orientations other than originally diagnosed. Palaeoephippium aranea Goodbody, 1986 is a junior synonym of P. bifurcum Goodbody, 1986. Palaeoephippium reteforme Goodbody, 1986 and P. ramipendentes Goodbody, 1986 are synonymized with P. radices Goodbody, 1986. Palaeotripus monospinosum Goodbody, 1986 is synonymized with Palaeoephippium spinosum Goodbody, 1986. One new species, Palaeodecaradium gordoni, is described. It possesses six rays; the apical rays are long and curved. The basal rays bear spinules on their lateral margins.

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