Albaillellata

Neoalbaillella optima, from Afanasieva et al. (2005).

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.

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