radiolaria - rads_cat - Calocycletta cladara radiolaria - rads_cat - Calocycletta cladara

CATALOG OF ORIGINAL DESCRIPTIONS: Calocycletta cladara Sanfilippo & Riedel 1992

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 -> Calocycletta -> Calocycletta cladara
Other pages this level: C. anekathen, C. caepa, C. cladara, C. mizunamiensis, C. parva, C. robusta, C. serrata

Calocycletta cladara

Citation: Calocycletta cladara Sanfilippo & Riedel 1992
Taxonomic rank: species
Described on page(s) : p.30
Type specimens: pl.2, figs.12-16
Family (traditional): Pterocorythidae
Family (modern): Pterocorythidae

Current identification/main database link: Calocycletta cladara Sanfilippo & Riedel 1992


Original Description

Three-segmented pterocorythid with the cephalis distinctly pored, bearing a rather strong, slightly bladed horn. Generally, the lateral lobes of the cephalis are indistinct, and do not cause a distinct break in its contour. Thorax inflated-conical to subspherical, with pores irregular in size and arrangement,
which in late forms tend to be larger near the collar stricture and with their bars joining the cephalis above the level of the collar
pores. The thoracic wall is a thin, porous lamella proximally, becoming much thicker distally where the pore frames are high. Abdomen distinctly more delicate than the thorax, irregularly subcylindrical, often constricted medially; when observed complete, which is rarely, terminated with a thin poreless peristome bearing small teeth. In late forms the row of pores just below the lumbar stricture increase in size to two or three times the size of the surrounding pores.

Size:
Based on 50 specimens. Length (excluding horn) 110-215 µ (usually about 156 µ), length of cephalothorax 75-110 µ; width of thorax 80-105 µ, width of abdomen 85-135 µ (usually about 110 µ).

Etymology:
Greek kladaron = wavy

Extra details from original publication
Distinguishing characters: This species differs most markedly from others of the genus by the lack of regular pore arrangement. It bears a superficial resemblance to some species of Albastrossidium and Lamprocyclas, but tracing its evolution revealed its true relationship to Calocycletta virginis. In the latest members of the latter species the thoracic pores lose their strict regular arrangement the horn tends to become bladed and some specimens have a delicate abdomen lacking teeth. It differs from Pterocorys minythorax (Nigrini) (Caulet and Nigrini, 1988, p.231, pl.2, fig.6) by its larger thorax (P. minythorax thoracic width 63-72 ?; length of cephalothorax 63-81 ?), its irregular pore arrangement and the tendency in later forms to develop larger pores at the collar and lumbar strictures. The theoperid Stichocorys johnsoni Caulet is confusingly
similar. It also displays the larger pores just below the lumbar stricture and the same sinuous abdomen, but it has a simple cephalis.

Phylogeny: C. cladara arose from C. virginis and left no descendants. It terminates the subgenus Calocycletta (Calocycletta).

Editors' Notes
C. cladara occurs in low abundances in all of the Miocene assemblages of the appropriate age from latitudes lower than 40 degrees. It reaches its highest abundances (up to 5% of the total assemblage) in the Late Miocene Indian Ocean assemblages.

References:

Sanfilippo, A. & Riedel, W. R. (1992). The origin and evolution of Pterocorythidae (Radiolaria): A Cenozoic phylogenetic study. Micropaleontology. 38(1): 1-36. gs


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Calocycletta cladara compiled by the radiolaria@mikrotax project team viewed: 19-2-2025

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