Aparchitidae

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. The type genus, Aparchites, is known from the Lower Ordovician to the Middle Devonian and characterised by a generally swollen carapace with the hinge line distinctly shorter than the carapace and the cardinal angles distinctly obtuse (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
    |--Longidorsa rectelloides Schallreuter 1985 WSB93
    |--Brevidorsa devonica Reynolds 1978 WSB93
    |--Macronotella Ulrich 1894 [incl. Baltonotella Sarv 1959] BB61
    |    `--*M. scofieldi Ulrich 1894 BB61
    |--Neoaparchites Bouček 1936 BB61
    |    `--*N. obsoletus (Jones & Holl 1865) [=Primitia obsoleta] BB61
    |--Aparchitellina Polenova 1955 (n. d.) M61, BB61
    |    `--*A. decorata Polenova 1955 BB61
    |--Coeloenellina Polenova 1952 M61
    |    `--*C. parva Polenova 1952 M61
    |--Ginella Ivanova 1960 [=Pinella Ivanova 1955 non Stephenson 1941] M61
    |    `--*G. tenuispina (Ivanova 1955) [=*Pinella tenuispina] BB61
    |--Zaborovia Polenova 1952 (n. d.) M61, BB61
    |    `--*Z. obscura Polenova 1952 BB61
    |--Cyathus Roth & Skinner 1930 non Haller 1768 (ICBN) CB86
    |    |--*C. ulrichi Roth & Skinner 1930 BB61
    |    |--C. caperatus (Guan 1978) [=Sinocoelonella caperata] CB86
    |    `--C. formosus Shi 1982 CB86
    |--Saccelatia Kay 1940 [=Saccaletia] BB61
    |    |--*S. arrecta (Ulrich 1894) [=Aparchites arrectus] BB61
    |    |--S. arcamuralis BB61
    |    `--S. bullata BB61
    |--Aparchites Jones 1889 BB61
    |    |--*A. whiteavesi Jones 1889 BB61
    |    |--A. crossotus BB61
    |    |--A. fimbriatus BB61
    |    `--A. kauffmanensis BB61
    `--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

REFERENCES

[BB61] Benson, R. H., J. M. Berdan, W. A. van den Bold, T. Hanai, I. Hessland, H. V. Howe, R. V. Kesling, S. A. Levinson, R. A. Reyment, R. C. Moore, H. W. Scott, R. H. Shaver, I. G. Sohn, L. E. Stover, F. M. Swain & P. C. Sylvester-Bradley. 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.

[M61] Moore, R. C. 1961. Supplement—USSR treatise on Ostracoda. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt Q. Arthropoda 3: Crustacea: Ostracoda pp. Q422–Q429. Geological Society of America and University of Kansas Press.

[WSB93] Whatley, R. C., D. J. Siveter & I. D. Boomer. 1993. Arthropoda (Crustacea: Ostracoda). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 343–356. Chapman & Hall: London.

Last updated: 17 October 2020.