Morphology: Skeleton consisting of two segments. First segment, "cephalis," considerably smaller than second. "Cephalis" with numerous small pores; often these are filled with skeletal substance leaving on surface only small depressions — honeycomb. First segment distinctly demarcated from second. Upper part of second chamber conical, with smaller pores than in cylindrical lower part. Pores gradually enlarging towards bottom of shell; they are irregularly polygonal. Many supplementary needles and spines on surface of shell. Internal skeleton composed of basic elements (needles MB, A, Vert, D, Lr and Li), all of them comparatively slender and weakly marked. Externally needles A and Vert forming two horns on "cephalis," needles D, Li and Lr directed obliquely downwards, pass through the wall of the second segment, but not forming stout processes of the shell and not always well marked, particularly when concealed among the numerous supplementary needles. Dimensions: length of first segment about 35 µ, width about 40 µ, length of second segment 150 µ and more, width 100 — 120 µ.
Size:
Biogeography and Palaeobiology
Biostratigraphic distribution
Geological Range: Last occurrence (top): Extant. Data source: Lazarus et al. 2015 - "R age group" First occurrence (base): within Quaternary Period (0.00-2.59Ma, base in Gelasian stage). Data source: Lazarus et al. 2015 - "R age group"
Plot of occurrence data:
Range-bar - range as quoted above, pink interval top occurs in, green interval base occurs in.
Triangles indicate an event for which a precise placement has been suggested
Histogram - Neptune occurrence data from DSDP and ODP proceedings. Pale shading <50 samples in time bin. Interpret with caution & read these notes
Nishimura, A. & Yamauchi, M. (1984a). Radiolarians from the Nankai Trough in the northwest Pacific. News of Osaka Micropaleontologists, Special Volume. 6: 1-148. gs
Petrushevskaya, M. G. (1967). Radiolayarii otryadov Spumellaria i Nassellaria Antarkicheskoi oblasti (po materialam Sovetskoi Antarkitcheskikh Ekspeditsii). Issledovanie Faunyi Morey (Akademii Nauk SSSR) Leningrad. 4(12): 5-186. gs
Petrushevskaya, M. G. (1971a). Radiolyarii Nasselaria v planktone Mirovogo okeana [Nasellarian radiolarians in the plankton of the world ocean]. Trudyi Zoologicheskogo Instituta, Akademiya Nauk, SSSR. 9(17): 1-294. gs
Gondwanaria dogieli compiled by the radiolaria@mikrotax project teamviewed: 15-8-2022
type image: S. dogieli
type image: S. dogieli
