Belongs within: Aculearia.
The Albaillellata are a group of radiolarians known from the Middle Ordovician to the Early Triassic, distinguished by the possession of a bilaterally symmetrical skeleton (Afanasieva et al. 2005).
Characters (from Afanasieva et al. 2005): Bilaterally symmetrical, with elongated, mainly conical skeleton with pylome. Internal frame formed by fusion of two initial four-rayed spicules and by development of spines a, b, and i in one plane, but either initial H-shaped subparallel development of spines a and i, connected by spine b at base of skeleton, or by development of subsagittal closure (r) of spines a and i in apical part of skeleton.
<==AlbaillellataAA05 |--FollicucullidaeAA05 | |--Pseudoalbaillella Holdsworth & Jones 1980AA05 | |--Parafollicucullus Holdsworth & Jones 1980AA05 | | `--P. fusiformisAA05 | `--Follicucullus Ormiston & Babcock 1979AA05 | |--F. scholasticusAA05 | `--F. ventricosusAA05 `--+--CorythoecidaeAA05 | |--Corythoecia Foreman 1963AA05 | | `--C. loxosegmentataAA05 | |--Camptoalatus Nazarov & Rudenko 1981AA05 | | `--C. benignusAA05 | `--Arrectoalatus Nazarov & Ormiston 1985AA05 | `--A. cernuusAA05 `--AlbaillellidaeAA05 |--Spinodeflandrella Kozur 1981AA05 |--Protoalbaillella Cheng 1986AA05 | `--P. deflandrei Cheng 1986AA05 |--Etymalbaillella Li 1995AA05 | `--E. yennieniiAA05 |--Albaillella Deflandre 1952AA05 | |--A. amplificataAA05 | `--A. pennataAA05 |--Haplodiacanthus Nazarov & Rudenko 1981AA05 | |--H. anfractusAA05 | `--H. circinatusAA05 `--Neoalbaillella Takemura & Nakazeko 1981AA05 |--N. grypisAA05 `--N. optimaAA05
*Type species of generic name indicated
References
[AA05] Afanasieva, M. S., E. O. Amon, Y. V. Agarkov & D. S. Boltovskoy. 2005. Radiolarians in the geological record. Paleontological Journal 39 (Suppl. 3): S135–S392.