Clavulinopsis is a genus of foraminiferans 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 | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Clade: | Sar |
| Clade: | Rhizaria |
| Phylum: | Foraminifera |
| Class: | Globothalamea |
| Order: | Textulariida |
| Family: | Pseudogaudryinidae |
| Subfamily: | Pseudogaudryininae |
| Genus: | †Clavulinopsis Banner and Desai, 1985 |
Clavulinopsis has a free aggulinated test with a considerable calcareous groundmass. The early stage is triserial, later abruptly becoming uniserial; cross section triangular. 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 open into 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.