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radiolaria - rads_cat - Calocyclas aphradia radiolaria - rads_cat - Calocyclas aphradia

CATALOG OF ORIGINAL DESCRIPTIONS: Calocyclas aphradia Sanfilippo & Blome 2001

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: rads_cat -> C -> Calocyclas -> Calocyclas aphradia
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Calocyclas aphradia

Citation: Calocyclas aphradia Sanfilippo & Blome 2001
Taxonomic rank: species
Described on page(s) : p.202
Type specimens: fig.6d-f.
Type repository: Holotype (Fig. 6d) from 171B-1051A-12H-5, 39-41 cm, in the middle Eocene that is equivalent to the lower part of the low-latitude Podocyrtis chalara Zone (equivalent to calcareous nannofossil Zone CP14b).
Family (traditional): Theoperidae
Family (modern): Eucyrtidiidae

Current identification:


Original Description

Similar in general form to Calocyclas hispida (Fig. 6g), except that the thorax is poreless or with only a few small, subcircular scattered pores. Shell consists of of three segments, with the collar and lumbar strictures expressed externally. Cephalis spherical, poreless or with a few small pores, bearing three conical horns of variable length. The apical spine is free in the cephalic cavity and continues externally as the apical horn. Auxiliary spines arising from the mitral arches close to the cephalic wall give rise to the two additional horns. Thorax campanulate, poreless, or rarely with a few small circular pores in the collar region. Early in the range small pores are scattered along ridges on the thorax caused by three spines spines (dorsal and two primary laterals) prolonged in the upper half of the thorax and protruding as small thorns. The vertical spine extends beyond the cephalic wall near the collar stricture. The proximal part of the cylindrical to truncate-conical abdomen is poreless, except for a row of very small circular pores just below the lumbar stricture. The remainder consists of 12-20 subparallel to tapering lamellar feet or teeth.

Size:
Measurements based on 25 specimens throughout the stratigraphic range of the species from 171B-1051A-2H-5, -8H-5, -9H-5, -12H-2, and -12H-5. Length (excluding horn) 135-245 µm; length of cephalothorax 65-90 µm; length of hyaline part of abdomen 45-70 µm; length of teeth 30-90 µm; length of horn 45-80 µm; breadth of thorax 50-90 µm; breadth of hyaline abdomen 80-125 µm; distal breadth of teeth 90-125 µm.

Etymology:
The name is derived from the Greek noun aphradia, feminine, folly, fool.

Extra details from original publication
Distinguishing characters: Calocyclas aphradia n. sp. is distinguished by its three horns and by having a shell that is hyaline except for a row of small pores just below the lumbar stricture. Slight variation in the size of the three horns. Early forms may have a few scattered pores in the collar region.

Phylogeny: Calocyclas aphradia n. sp. is an offshoot of Calocyclas hispida.

Editors' Notes
Equaivalent to: Unidentified theoperid in Sanfilippo & Riedel 1979, pl. 1, fig. 12.

References:


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Calocyclas aphradia compiled by the radiolaria@mikrotax project team viewed: 25-3-2025

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