Gondwanaria deflandrei


Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Gondwanaria -> Gondwanaria deflandrei
Sister taxa: G. campanulaeformis, G. deflandrei, G. dogieli, G. hister, G. japonica, G. reshetnjakae, G. sp.

Taxonomy

Citation: Gondwanaria deflandrei Petrushevskaya 1975
Rank: species
Basionym: Gondwanaria deflandrei
Taxonomic discussion: Petrushevskaya 1975 p 584 pl 9 figs 8-9; Abelmann 1990 (ODP 113 SR) p 697 pl 7 fig 7

Catalog entries: Gondwanaria deflandrei

Original description: The outline of the skeleton is very similar to G. japonica. The cephalis is with a neck. The thorax subconical, 70-100µm in width and in height. The upper part of the abdomen is slightly wider than the thorax. The two segments are separated by the inner ring. Distinguishing characters (rw): More pores on half of the equator of the thorax than in G. japonica (15-20), the main difference between the two species. The species differs from Dictyoceras xiphephorum in having cephalis with a neck. It differs from the specimens illustrated by Petrushevskaya and Kozlova, 1972, pl. 37, fig. 13, 14 by a more defined shell outline and an obligate ring between thorax and abdomen.
Remarks on original description: In DSDP Leg 29 samples it occurs in early Miocene, but specimens of that group may be found in Quaternary deposits both in the Antarctic and in the North Atlantic.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within Paleogene Period (23.03-66.04Ma, top in Chattian stage). Data source: Lazarus et al. 2015 - "P age group"
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Lazarus et al. 2015 - "P age group"

Plot of occurrence data:

References:

Abelmann, A. (1990). Oligocene to Middle Miocene radiolarian stratigraphy of southern high latitudes from Leg 113, Sites 689-690, Maud Rise. Proceedings of the Ocean Drilling Program, Scientific Results. 113: 675-708. gs V O

Petrushevskaya, M. G. (1975a). Cenozoic radiolarians of the Antarctic, Leg 29, DSDP. Initial Reports of the Deep Sea Drilling Project. 29: 541-675. gs


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Gondwanaria deflandrei compiled by the radiolaria@mikrotax project team viewed: 14-5-2021

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