Right and left valves of Libumella walkerorum, from Hoare & Merrill (2004).

Belongs within: Ostracoda.

The Aparchitidae are a group of ostracods known from the Lower Ordovician to the middle Upper Carboniferous (Benson et al. 1961).

Characters (from Benson et al. 1961): Carapace nonsulcate, inequivalved, largely amplete; adductor muscle scar not visible exteriorly or indistinct but may also be well defined; velar structure developed as low ridge which may be tuberculate, extending along ventral border and in some along part of end borders or entire free border; subvelar area channeled; dimorphism not observed.

<==Aparchitidae [Aparchitoidea, Oepikellacea]
    |--Cyathus Roth & Skinner 1930 CB86
    |    |--C. caperatus (Guan 1978) [=Sinocoelonella caperata] CB86
    |    |--C. formosus Shi 1982 CB86
    |    `--C. ulrichi (Roth & Skinner 1930) CB86
    `--Libumella Rozhdestvenskaja 1959 HM04
         |--L. bonapartensis Jones 1989 HM04
         |--L. cribrosa Robinson 1978 HM04
         |--L. discoides Rozhdestvenskaja 1959 HM04
         |--L. reticulata Robinson 1978 HM04
         `--L. walkerorum Hoare & Merrill 2004 HM04

*Type species of generic name indicated


Benson, R. H., J. M. Berdan et al. 1961. Systematic descriptions. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt Q. Arthropoda 3: Crustacea: Ostracoda pp. Q99-Q421. Geological Society of America and University of Kansas Press.

[CB86] Chen D.-Q. & Bao H. 1986. Lower Permian ostracodes from the Chihsia Formation of Jurong and Longtan, Jiangsu Province. Acta Micropalaeontologica Sinica 3 (2): 107-132.

[HM04] Hoare, R. D., & G. K. Merrill. 2004. A Pennsylvanian (Morrowan) ostracode fauna from Texas. Journal of Paleontology 78 (1): 185-204.

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