The Hirsutospirellidae, established for the

Late Triassic The Late Triassic is the third and final epoch (geology), epoch of the Triassic geologic time scale, Period in the geologic time scale, spanning the time between annum, Ma and Ma (million years ago). It is preceded by the Middle Triassic Epoch ...

genus '' Hirsutospirella'', are a family of

Foraminifera Foraminifera (; Latin for "hole bearers"; informally called "forams") are single-celled organisms, members of a phylum or class of amoeboid protists characterized by streaming granular Ectoplasm (cell biology), ectoplasm for catching food and ot ...

within the

Involutinida Involutinida is an order of foraminifera included in the Spirillinata found in the fossil record from the early Permian to early Late Cretaceous (Cenomanian). Diagnosis The Involutinida are characterized by a two chambered aragonitic test Te ...

that produced calcareous

tests Test(s), testing, or TEST may refer to: * Test (assessment), an educational assessment intended to measure the respondents' knowledge or other abilities Arts and entertainment * ''Test'' (2013 film), an American film * ''Test'' (2014 film), ...

with a proloculus followed by an undivided trochospirally enrolled tubular second chamber, in which the spiral side has prominent spinelike protrusions and umbilical side has a shallow umbilical filling.Hirsutospirellidae
Loeblich & Tappan, 1988 in GSI e-book

References

Spirillinata Foraminifera families Prehistoric SAR supergroup families {{foraminifera-stub