radiolaria - rads_cenozoic - Ceratocyrtis radiolaria - rads_cenozoic - Ceratocyrtis

Ceratocyrtis


Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae -> Ceratocyrtis
Sister taxa: Amphiplecta, Antarctissa, Arachnocalpis, Arachnocorallium, Arachnocorys, Archipera, Archiperidium, Archipilium, Botryopera, Ceratocyrtis, Cryptogyrus, Dictyocephalus, Dictyocryphalus, Entepipedus, Gondwanaria, Lipmanella, Lithocampana, Lithomelissa, Lophophaena, Marimoum, Mitrocalpis, Pelagomanes, Periarachnium, Peromelissa, Phormacantha> >>
Daughter taxa (time control age-window is: 0-800Ma)
Ceratocyrtis amplus

neptune records: 19
Ceratocyrtis arthuri
Dome-shaped skeleton; no external distinction between the cephalis and the thorax; all spines connect together halfway down the shell cavity.
neptune records:
Ceratocyrtis broeggeri

neptune records: 13
Ceratocyrtis cucullaris

neptune records: 10
Ceratocyrtis dolvenae
Large, more or less aligned, quadrangular, thoracic pores; cephalis and thorax indistinguishable externally; spines Ll, Lr and D extend laterally at cephalic suture.
neptune records:
Ceratocyrtis erosa

neptune records:
Ceratocyrtis fimbria

neptune records:
Ceratocyrtis galeus

neptune records:
Ceratocyrtis histricosa

neptune records: 91
Ceratocyrtis manumi
A species of Ceratocyrtis characterized by a broad, low- domed cephalis and an hour-glass shaped thorax
neptune records: 12
Ceratocyrtis mashae

neptune records: 139
Ceratocyrtis multicornus
Remarks. This species is distinguished from other species of Ceratocyrtis by having one to five or more horns on the shell that are unrelated to the internal spicules.
neptune records:
Ceratocyrtis panicula

neptune records:
Ceratocyrtis pseudoadvena

neptune records:
Ceratocyrtis ringisstola
Large dicyrtid; rim with teeth at thorax termination; small cephalis with internal spicule in a cross pattern
neptune records:
Ceratocyrtis robustus

neptune records: 3
Ceratocyrtis sinuosa

neptune records:
Ceratocyrtis stoermeri
A species of Ceratocyrtis characterized by its massive cylindrical thorax with prominent lattice bar ridges forming polygonal pore frames.
neptune records: 2
Ceratocyrtis sp.

neptune records: 156

Taxonomy

Citation: Ceratocyrtis Bütschli 1882
Taxonomic rank: genus
Basionym: Ceratocyrtis
Type species: Cornutella cucullaris Ehrenberg 1873
Taxonomic discussion: Helotholus synonymized with Ceratocyrtis by Petrushevskaya, 1971

Catalog entries: Ceratocyrtis

Original description: Die Gattung Cornutella Ehbg. (Mnb. 1838) umschließt im Sinne Ehrenberg’s, nach Ausscheidung einer Reihe schon erwähnter Formen, noch mindestens zwei ziemlich verschiedene Formreihen. Die eine derselben, welche ich hier unter neuer Bezeichnung zusammenfasse, wird gebildet von C. mitra E., C.? cucullaris E., C. ampliata E. und ? C. circularis E., von welchen ich C. cucullaris und eine wahrscheinlich zu ampliata zu ziehende Form zu studieren Gelegenheit hatte. Diese Formen zeigen in Bezug auf das Köpfchen etwa dieselben Verhältnisse wie Carpocanium und Cyrtocalpis; dasselbe ist nämlich recht ansehnlich, jedoch so wenig abgesetzt vom ersten Glied, dass äußerlich eine monocyrtide Bildung hervortritt (siehe Fig. 36 a und b). Sie leiten sich daher von sehr primitiven Dicyrtiden ab. Diese Ableitung selbst bietet jedoch Schwierigkeiten. Der Bau der vorderen Ringhälfte a mit den starken seitlichen Ästen h, die stark aufsteigende und nicht vollständige hintere Hälfte b, sowie die von den Querstäben e und der vorderen Ringhälfte absteigenden Äste g, die sich zu dem ersten Glied begehen und welche den Primärstacheln von Lithomelissa entsprechen, lässt bedenken, ob nicht eine Beziehung zu letzterer Form vorhanden. Sicherer Entscheid ist jedoch vorerst nicht möglich.


Translated description: Besides the forms already mentioned, the genus Cornutella (as understood by Ehrenberg, 1838) includes at least two groups of considerably different forms. One group, that I describe here under this new name, includes C. mitra, C. ? cucullaris, C. amplia and ? C. circulris Ehrenberg, from which I had the opportunity to study C. cucullaris and a form probably close to C. ampliata. Their cephalis presents the same ratio as in Carpocanium and Cyrtocalpis; it is well-developed, although so slightly distinguished from the first segment that these forms have an external shape of Monocyrtida (fig.36a, b). They originate, thus, from very primitive Dicyrtida. This sub-division presents itself, however, some problem. The construction of an anterior half ring a with the robust lateral apophyse h, the strongly upwards directed and incomplete posterior halve b, as well as the apophyse g directed downwards from the transversal bar e and anterior half ring, that pass on the first segment and correspond to the primary spines of Lithomelissa, may be considered, or not, as indicative of a correlation with the last present form. For the moment, this conclusion is not possible, however, completely sure. (Translation by J.P.C.)]
Remarks on original description: [Fig. 36 refers to C. cucullaris (Ehrenberg) in Butschli, 1882a.]

Description

Biogeography and Palaeobiology

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant. Data source: Total of ranges of the species in this database
First occurrence (base): within Paleogene Period (23.03-66.04Ma, base in Danian stage). Data source: Total of ranges of species in this database

Plot of occurrence data:

References:

Bütschli, O (1882a). Beitrage zur Kenntnis des Radiolarienskelette, insbesondere der der Cyrtida. Zeitschrift für wissenschaftliche Zoologie. 36: 486-540. gs


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Ceratocyrtis compiled by the radiolaria@mikrotax project team viewed: 21-7-2026

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