Domain Eukaryota Phylum Foraminifera Order Textulariida Rank Genus | Superphylum Retaria Class Globothalamea Superfamily Textulariacea | |
Clavulinopsis is a genus of foraminifera from the Upper Cretaceous of the United States (Texas, Arkansas), included in the Textulariida. The type species is Clavulinopsis hofkeri Banner and Desai, 1985.
Clavulinopsis has an free aggulinated test with a considerable calcareous groundmass. The early stage is triserial, later abruptly becoming uniserial; cross section triagular. Sutures are slightly depressed, horizontal to slightly arched at the center of the flattened sides. Lateral walls are filled with fine micro-tubular cavities (term: canaliculate) that openinto the chamber interiors, but are sealed externally by a finely agglutinated outer layer. Septa are solid, without micro-tubular cavities. The aperture is cribrate, with irregular pores at the end of a slightly produced neck.