Belongs within: Spirillinana.
The Lasiodiscidae are a group of fusulinids known from the Lower Carboniferous to the Upper Permian in which the test is primarily composed of a single tubular chamber (Loeblich & Tappan 1964).
Characters (from Loeblich & Tappan 1964): Test planispiral to conical, proloculus followed by unsegmented tubular chamber; wall calcareous, with microgranular layer and radially built vitreous layer, latter concentrated as umbilical fillings perforated by canal-like fissures in advanced forms but consisting only of bridges across spiral suture in simple forms; aperture at open end of tubular chamber, with supplementary sutural openings.
<==Lasiodiscidae | i. s.: MesolasiodiscusCM01 | Lasiodiscus Reichel 1946 [Lasiodiscinae]HW93 | `--*L. granifer Reichel 1945LT64 | Lasiotrochus Reichel 1946LT64 | `--*L. tatoiensis Reichel 1946LT64 | Glomotrocholina Nikitina 1977HW93 |--Vissariotaxis Mamet 1970CM01, HW93 [Vissariotaxinae] | `--V. compressaCM01 `--+--Planohowchinia Cózar & Mamet 2001CM01 | `--*P. espielensis Cózar & Mamet 2001CM01 `--+--Howchinia Cushman 1927CM01, LT64 (see below for synonymy) | |--*H. bradyana (Howchin 1888) [=Patellina bradyana]LT64 | `--H. gibba (von Möller 1879) [=Tetrataxis conica var. gibba, *Monotaxis gibba]LT64 `--+--Monotaxinoides Brazhnikova & Yartseva 1956CM01, LT64 [Monotaxinoididae] | `--*M. transitorius Brazhkinova & Yartseva 1956LT64 `--Eolasiodiscus Reytlinger 1956CM01, LT64 |--*E. donbassicus Reytlinger 1956 [=Monotaxinoides donbassicus]LT64 |--E. curvusCM01 `--E. priscusCM01
Howchinia Cushman 1927CM01, LT64 [incl. Monotaxis Vissarionova 1948 nec Bennett 1830 nec Hulst 1898 nec Hampson 1900LT64; Howchiniidae]
*Type species of generic name indicated
References
[CM01] Cózar, P., & B. L. Mamet. 2001. Planohowchinia (Lasiodiscidae, Foraminiferida), a new Late Viséan genus, southwestern Spain. Journal of Foraminiferal Research 31 (3): 228–232.
[HW93] Hart, M. B., & C. L. Williams. 1993. Protozoa. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 43–70. Chapman & Hall: London.
[LT64] Loeblich, A. R., Jr & H. Tappan. 1964. Sarcodina: chiefly “thecamoebians” and Foraminiferida. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt C. Protista 2 vol. 1. The Geological Society of America and The University of Kansas Press.