Cessipylorum Nazarov & Ormiston

Noble, Paula, Aitchison, Jonathan C., Danelian, Taniel, Dumitrica, Paulian, Maletz, Jörg, Suzuki, Noritoshi, Cuvelier, Jessie, Caridroit, Martial & O’Dogherty, Luis, 2017, Taxonomy of Paleozoic radiolarian genera, Geodiversitas 39 (3), pp. 419-502 : 480

Cessipylorum Nazarov & Ormiston in Nazarov, 1988 sensu Nazarov & Ormiston (1993)

Cessipylorum Nazarov & Ormiston in Nazarov, 1988: 70. — Nazarov & Ormiston 1993: 43.

TYPE SPECIES. — Pylentonema aperta Nazarov in Nazarov, Popov & Apollonov, 1975 ( Nazarov et al. 1975: 102, pl. 1, figs 1, 2).

AGE AND LOCATION OF TYPE MATERIAL. — Middle Ordovician, Central Kazakhstan.

TAXON CODE. — 256.

STATUS. — Junior synonym of Kalimnasphaera Webby & Blom, 1986 ( Noble & Webby 2009: 559).

DIAGNOSIS. — “Внутренний каркас расположен в центре и представлен полой сферой с шестью-семью, реже менее, лучами, отходящими от нее. Одна сферическая, пористая оболочка диаметром до 200 мкм. Иногда на лучах спикулы во внутренней полости сферы развиты апофизы,имеющие тенденции к соединению и образованию внутренней, частично развитой сферы. Внешние основные иглы стержневидной формы.” (Nazarov & Ormiston in Nazarov 1988: 70).

DIAGNOSIS (English translation). — “Inner shell is located in the center and represented by a hollow sphere with six-seven, rarely less rays radiating from it. A spherical latticed shell diameter of 200 microns. In some specimens, the inner rays develop apophyses that form an internal, partially developed shell. Externally the main spines rod-shaped.”

REMARKS

Nazarov & Ormiston (1993) provide a more detailed diagnosis (?revision) as follows “Shell subspherical, wall pored. Internal framework a hollow, imperforate sphere 30 to 40 µm in diameter with seven rays emanating from it. In some cases there is development of apophyses on the rays of the internal framework. These apophyses tend to coalesce and form a second, partially developed internal shell. The outer shell carries seven main conical spines, two of which are situated around the pylome; the remaining five are arrayed at angles of approximately 90° to each other over the entire external shell surface. Secondary spines developed at the corners of the interpore lattice. Pylomal opening bordered by a thickened lip and two main spines.” This description is similar to that of Cessipylarum , which signifies that the two genera represent a single genus, misspelled in one case.