Stichocorys delmontensis

Classification: rads_cenozoic -> Theoperidae -> Eucyrtidiidae -> Stichocorys -> Stichocorys delmontensis
Sister taxa: S. armata, S. delmontensis, S. diploconus, S. greeni, S. johnsoni, S. negripontensis, S. peregrina, S. wolffii, S. sp.


Citation: Stichocorys delmontensis (Campbell and Clark) Sanfilippo and Riedel 1970
Rank: species
Basionym: Eucyrtidium delmontensis
Taxonomic discussion: (Campbell & Clark)1944 p.56 pl.7 fig.19-20 as Eucyrtidium; Sanfilippo & Riedel 1; Sanfilippo et al.1985 p.681-682 figs.23.1a-b

Catalog entries: Eucyrtidium delmontense

Original description: Shell not especially large, rather stout (1.6-2.4 diameters of cylinder in length); cephalis knoblike, distinct, with much lateral flattening, and with a short, sometimes curved, or straight, apical horn, cervix truncate and constricted; thorax distinct, truncate apically, subhemispherical, its basal diameter exceeding distal diameter, and marked by an internal transverse septum; abdominal joints three, clearly limited by lumbar constrictions and transverse septa, uppermost joint subhemispherical like thorax and more or less continued in contour with it, these two regions forming, as a whole, a cone (45°), its sides strongly bulged, its length approximately 0.29 total length, and its basal diameter 1.37 upper diameters, second and third joints together subcylindrical, second one about same length as first, and third one shorter, its distal end inturned with a somewhat constricted mouth with short, projecting, discrete, spinelike denticles (mouth commonly torn); wall uniformly thin, gray; pores lacking on cephalis, on thorax approximately 40, well scattered, in subhexagonal areas with raised corners, pores of abdomen larger than those of thorax, well separated, scattered, all pores subcircular.

Length, total, 200µm; diameter of cylindrical abdomen, 70µm, of pores, 8.8µm. Distinguishing characters (rw): Rare individuals have first two shell-segments together barrel-like in shape.
Eucyrtidium delmontense n. sp. has a wider mouth and a more clearly defined bell shape than calvertense (Martin, 1904) and has fewer internal septa and abdominal divisions than acuminatum (Ehrenberg, 1847), from Sicily.
Remarks on original description: [Campbell and Clark here list the species with the subgeneric name Eucyrtis and include the subgeneric name in the species name.


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:


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


Stichocorys delmontensis compiled by the radiolaria@mikrotax project team viewed: 15-5-2021

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