Cycladophora cabrilloensis

Classification: rads_cenozoic -> Theoperidae -> Theopilidae -> Cycladophora -> Cycladophora cabrilloensis
Sister taxa: C. antiqua, C. bicornis, C. cabrilloensis, C. campanula, C. conica, C. cosma, C. davisiana, C. golli, C. humerus, C. pliocenica, C. robusta, C. sakaii, C. spongothorax, C. tetracantha, C. sp.
Daughter taxa (time control age-window is: 0-800Ma)
Cycladophora cabrilloensis subhumerus

neptune records:


Citation: Cycladophora cabrilloensis (Campbell and Clark) Lombari and Lazarus 1988
Rank: species
Basionym: Clathrocyclas cabrilloensis

Catalog entries: Clathrocyclas cabrilloensis

Original description: Shell large, generally flat-campanulate or like a coolie hat; two apical horns (about 80° apart), one, upper, longer, and stronger than other lateral one, both originating separately on upper side wall of cephalis, horns stout (8°), conical, distally sharp and not over 0.2 maximum of shell diameter in length; cephalis caplike, conical, only 0.3 length of horn in length and diameter, distally round, asymmetrical, and with neck stricture sharp; thorax widely subconical, its lumbar diameter 1.6 its own length, sides sometimes but not always plane, commonly a little asymmetrical, and locally bulged; abdomen a flat ring nearly whole shell length in diameter, forming a sort of a brim around thorax, lumbar stricture limiting its inner margin, free margin with short, sharp, triangular feet, one foot on each of pore-frames, lumbar stricture limiting shell-aperture; wall generally like a wickerwork or basket, thin, and open; surface of upper 0.3 of thorax with sharp, thin, conical, thorns or spines forming an accessory spinous crown around larger apical horns; pores of cephalis tiny, well separated, shallow, numerous, at thorax and abdomen, very large, subuniform, more or less subhexagonal, about a dozen in a transverse row on thorax and in six or more vertical tiers, pores of tier graduated from largest near lumbar stricture to smaller near neck, not in strict tiers but in alternated series like a network or bee-comb, abdominal pores in but a single row.

Length, total, 210µm, of horns, 60µm; diameter, of abdomen, 200µm, of larger pores, 19.8µm. Distinguishing characters (rw): Clathrocyclas cabrilloensis n. sp. has a much smaller cephalis than semeles (Haeckel, 1887), has surface spines, lacking in latter, two rather than three horns, lacks arachnoidal network of iones (Haeckel, 1887),and has surface spines unlike latonae (Haeckel, 1887). All described species of subgenus to which it belongs are recent, warm-water, surface-dwelling types.
Remarks on original description: [Campbell and Clark here list the species under the subgeneric name Clathrocycloma 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:



Cycladophora cabrilloensis compiled by the radiolaria@mikrotax project team viewed: 18-4-2021

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