Lophocyrtis oberhaensliae

Taxonomy

Catalog entries: Lophocyrtis oberhaensliae

Original description: Fundamental spicule reduced to the bars separating four collar pores and apical bar forming a part of the cephalic wall. A weakly developed apical spine is present in some specimens, in others it is reduced to a thickenedcap over the cephalis. Cephalic wall perforated by 20-30 small circular to subcircular pores. Collar stricture marked by a distinct change in contour externally and a constriction internally. Thorax approximately hemispherical, with a rough surface and about 22-32 pores on the maximum circumference, arranged quincuncially. The abdomen is in many respects similar to that of the ancestor Lophocyrtis(Cyclampterium) milowi. While the abdomen in the ancestor is rounded triangular in crossection, because of the development of the keels, it is round in L. (S.) oberhaensliae. The abdominal pores are large (12-30 around the circumference), becoming even larger and more irregular in the latest members (Plate II, 14). This conically expanding segment is terminally open and often surrounded by up to12 short feet originating from the lattice bars constituting the abdominal lattice (there is no differentiated peristome) and not differentiated from the lattice. Later forms progressively develop a shorter, widely expanding abdomen with longer solid feet.

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): within (-Ma, top in "Holocene" stage). Data source:
First occurrence (base): within (-Ma, base in "Holocene" stage). Data source:

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
• Taxon plotted: Lophocyrtis oberhaensliae, synonyms included - Lophocyrtis oberhaensliae;
• See also space-time plot :: Samples map :: Parent: Lophocyrtis

Lophocyrtis oberhaensliae compiled by the radiolaria@mikrotax project team viewed: 10-9-2024 Taxon Search: Advanced Search Short stable page link: https://mikrotax.org/radiolaria/index.php?id=204595 Go to Archive.is to create a permanent copy of this page - citation notes

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