Diartus hughesi


Classification: rads_cenozoic -> Coccodiscidae -> Diartus -> Diartus hughesi
Sister taxa: D. hughesi, D. petterssoni, D. sp.

Taxonomy

Citation: Diartus hughesi (Campbell and Clark) Sanfilippo et al. 1985
Rank: species
Basionym: Ommatocampe hughesi
Taxonomic discussion: (Campbell and Clark)1944 p.23 pl.3 fig.12 as Ommatocampe hughesi; Sanfilippo & R; Sanfilippo et al.1985 p.655 fig.8.11

Catalog entries: Ommatocampe hughesi

Original description: Shell fairly large, with cylindrical center and five chambers at each end; central cortical section short (about 0.2 total length), somewhat wider than long, and with very slightly convex sides which are parallel, its surface rough but not thorny and with many small, deeply set, well-spaced, elliptical pores; peripheral cortical shell with five chambers on each opposite, club-shaped pole; these chambers kidney- or cap-shaped, fitted against each other with overlapping spine-bearing edges, chambers with convex distal ends and concave proximal ones with a sharp transverse cross-wall and free ridge, distalmost chamber on each end with about a dozen projecting spines which arise inside on its proximal wall and extend through chamber and pierce it; chambers with four to six longitudinal rows of elliptical to ovoidal, rarely irregular, well-set (not so deep as those of central section), fairly well separated pores (these pores larger than those of central section), generally pores subuniform in size; frame-work of peripheral section of wider bars than in central section; medullary shell obscured.

Length, total, 280µm, of central section, 48µm; greatest width (across peripheral arm), 90µm. Distinguishing characters (rw): Ommatocampe hughesi n. sp. differs from nereides (Haeckel, 1887) in shape, closer set of peripheral chambers, in lack of special larger proximal pores on chamber margins, and in cylindrical central section. Ommatocampe is one of most modified of Prunoidea, and evidently Haeckel was considerably confused in his treatment of this and other genera of Zygartidae for one or more of figures are doubly assigned in description of plates to different species. Many species occur in deep water, and two are fossil in late Tertiary.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Neogene Period (2.59-23.03Ma, top in Piacenzian stage). Data source: Lazarus et al. 2015 - "N age group"
First occurrence (base): within Neogene Period (2.59-23.03Ma, base in Aquitanian stage). Data source: Lazarus et al. 2015 - "N age group"

Plot of occurrence data:

References:

Campbell, A. S. & Clark, B. L. (1944a). Miocene radiolarian faunas from southern California. Geological Society of America, Special Papers. 51: 1-76. gs

Sanfilippo, A. & Riedel, W. R. (1973). Cenozoic Radiolaria (exclusive of theoperids, artostrobiids and amphipyndacids) from the Gulf of Mexico, Deep Sea Drilling Project Leg 10. Initial Reports of the Deep Sea Drilling Project. 10: 475-608. gs

Sanfilippo, A., Westberg-Smith, M. J. & Riedel, W. R. (1985). Cenozoic Radiolaria. In, Bolli, H. M. , Saunders, J. B. & Perch-Nielsen K. (eds) Plankton Stratigraphy. Cambridge University Press, Cambridge 631-712. gs


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Diartus hughesi compiled by the radiolaria@mikrotax project team viewed: 27-11-2020

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