EUCYRTIDIOIDEA Ehrenberg, 1846

Suzuki, Noritoshi, Caulet, Jean-Pierre & Dumitrica, Paulian, 2021, A new integrated morpho- and molecular systematic classification of Cenozoic radiolarians (Class Polycystinea) - suprageneric taxonomy and logical nomenclatorial acts, Geodiversitas 43 (15), pp. 405-573 : 470

Superfamily EUCYRTIDIOIDEA Ehrenberg, 1846

sensu Suzuki emend. herein

Eucyrtidina Ehrenberg, 1846: 385 [as a family]; 1847: 54 [as a family]; 1876: 156.

Stichocyrtoidea – Clark & Campbell 1942: 91 [nomen dubium, as a section above a family]; 1945: 49. — Campbell & Clark 1944a: 51; 1944b: 36 [as a section].

Stichoperilae – Loeblich & Tappan 1961: 229 [nomen dubium, as a subsuperfamily].

Eucyrtidioidea – Petrushevskaya 1971a: 166-169 ( sensu emend. ); 1971b: 985 ( sensu emend. ); 1975: 578; 1981: 165-167; 1986: 136. — Petrushevskaya & Kozlova 1972: 535. — Grill & Kozur 1986: 246 ( sensu emend. ). — Afanasieva et al. 2005: S297-298. — Afanasieva & Amon 2006: 146. — Matsuzaki et al. 2015: 56-57. — Suzuki in Sandin et al. 2019: 201 ( sensu emend. ).

Stichocyrtoidae – Cachon & Cachon 1985: 294 [nomen dubium].

Eucyrtidioida – Amon 2000: 62 [as an order].

Eucyrtidiacea [sic] – De Wever et al. 2001: 273 (= Eucyrtidioidea ).

DIAGNOSIS. — Multisegmented Nassellaria with a simple cephalis. Cephalic base clearly separated from the thorax by a basal ring of the cephalis. The subsequent segments are separated by significant dividers.

REMARKS

The Cenozoic Eucyrtidioidea includes the Eucyrtidiidae , Lithostrobidae and Xitomitridae , but molecular data was only provided for Eucyrtidium by Sandin et al. (2019). The identified family members of the Eucyrtidioidea were different among authors. For instance, nine families were identified in Petrushevskaya (1981) compared to the eight families in De Wever et al. (2001). In order to respect consistency between the morphological classification and molecular phylogenic studies ( Sandin et al. 2019), the Cenozoic families Theocotylidae , Theoperidae , Lophocyrtiidae and Bekomidae were herein excluded from the Eucyrtidioidea . Petrushevskaya (1981) included the Cenozoic families Lychnocaniidae , Sethoperidae , Artostrobiidae , Pterocorythidae and Carpocaniidae in the Eucyrtidioidea but all of them were also excluded in this catalogue. All previously mentioned families identified by De Wever et al. (2001) and Petrushevskaya (1981) that were herein excluded; differ from the Eucyrtidioidea on a variety of points. The main distinguishing features are the absence of significant dividers below the cephalo-thoracic area, a fewer number of segments (less than three or four), the possession of a more complex cephalic initial spicular system, and/or elongated robust feet generated by the A-, D- and double L-rods of the cephalis.