Classification: rads_cenozoic -> Plagiacanthidae -> Lophophaenidae
Sister taxa: Lophophaenidae, Plagiacanthidae (ss), Plagiacanthidae inc sed, Sethoperidae, Sethophormididae, Theopiliidae,
Daughter taxa: (blue => in age window 0-800Ma) Granddaughter taxa

neptune records: 32

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Citation: Haeckel, 1881
emend. Petrushevskaya, 1971
Rank: family (new classif)
Type species: Lophophaena Ehrenberg 1847
Notes & discussion: This family is part of the revised classification system being developed by Prof. Suzuki and colleagues

Catalog entries: Lophophaenidae [no catalog entry yet]


Distinguishing features: Two segemented plagiacanthids with well developed cephalis and thorax, and generally some external expression of primary spicules - either as lateral external spines or prolonged in thorax as ribs/feet. Cephalis generally relatively large, thorax termination irregular and lacking any special structures.

Morphology remarks:
Haeckel 1881 (as Lophophaenida): Sethocorida [Dyocyrtida aperta eradiata] margine ostii laevi aut succiso. Petrushevskaya 1971: Plagiocanthidae with the skeleton consisting of two equal segments: cephalis and thorax. Cephalis with a large eucephalic lobe and a small antecephalic lobe. The latter is not separated from the thorax because of the weakness of the arches cp. The spine A passes through the center of the cephalis like a columella, up to branches a. Then it becomes included in the front wall of the eucephalic lobe, which at the same time is the external wall of the upper part of the cephalis. Arches ap are included through their whole length in the walls of the cephalis. The spines A, D and L form free horns or spines.

Biogeography and Palaeobiology



Phylogenetic relations:

Similar species:

Biostratigraphic distribution

Geological Range:
Last occurrence (top): Extant Data source: Total of range of species in this database
First occurrence (base): at base of Danian Stage (0% up, 66Ma, in Danian stage). Data source: Total of range of species in this database

Plot of occurrence data:



Lophophaenidae compiled by the radiolaria@mikrotax project team viewed: 24-9-2020

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