Clavulinopsis is a l genus from the Upper Cretaceous of the US, (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.