CATALOG OF ORIGINAL DESCRIPTIONS: Theocyrtis tuberosa Riedel 1959
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Original Description Cephalis elongate, subdivided into three (?) indistinct loculi, with rough surface and subcircular to circular pores. Apical horn short, stout, three-bladed, often irregular in form or forked. Thorax subhemispherical, with pronouncedly tuberose surface due to low irregular protuberances, and subcircular to circular pores showing a tendency to longitudinal alignment. Lumbar stricture indistinct externally. Abdomen subcylindrical, somewhat contracted distally, usually with ragged termination, and having a plicate wall in which adjacent plicae are separated by two to four longitudinal rows of subcircular to circular pores. Size: (Based on 30 specimens). Length of apical horn 13-50µm; of cephalis 28-50µm; of thorax 83-133µm; of abdomen 38-168µm. Breadth of cephalis 35-45µm; of thorax 120-175µm. Extra details from original publication Distinguishing characters: In order to determine whether or not this species might be similar to Theocyrtis ptychodes Haeckel (1887a, p. 1408, pl. 69, fig. 8), the author searched through a large number of Radiolaria from the original sediment sample collected at Challenger Station 272, the type locality of that species. No form was found that resembled Theocyrtis ptychodes, indicating that it must be very rare if present at that locality. The structure of the cephalis of Theocyrtis tuberosa is apparently similar to that described in Anthocyrtidium cineraria Haeckel and Calocyclas virginis Haeckel (Riedel, 1957).
References:
Riedel, W. R. (1959a). Oligocene and Lower Miocene Radiolaria in tropical Pacific sediments. Micropaleontology. 5(3): 285-302. gs
Theocyrtis tuberosa compiled by the radiolaria@mikrotax project teamviewed: 23-1-2025
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