Healdianella darwinuloides, from Benson et al. (1961).

Belongs within: Ostracoda.

The Bairdiocyprididae are a group of ostracods known from the mid-Ordovician to the mid-Late Carboniferous (Whatley et al. 1993).

Characters (from Benson et al. 1961): Convex-backed ostracodes of bythocypridid shapes, mostly without ornamentation and sculpturing; left valve larger, with overlap and overreach of left valve over right; lacking separated calcified inner lamellae but with short hinges and contact margins simply ridged and grooved in platycopine fashion; adductor muscle scars circular and consisting of numerous closely grouped spots; sexual dimorphism mostly slight or unknown.

Bairdiocyprididae BB61
    |--Praepilatina homosibirica Becker 1991 WSB93
    |--Bairdites Coryell & Malkin 1936 BB61
    |    `--*B. deltasulcata Coryell & Malkin 1936 BB61
    |--Bekena Gibson 1955 BB61
    |    `--*B. diaphrovalvis Gibson 1955 BB61
    |--Coryellites Kellett 1936 [=Coryellina Kellett 1935 non Bradfield 1935] BB61
    |    `--*C. firma (Kellett 1935) [=*Coryellina firma] BB61
    |--Cytherellina Jones & Holl 1869 [incl. Orthocypris Kummerow 1953] BB61
    |    `--*C. siliqua (Jones 1855) [=Beyrichia siliqua] BB61
    |--Longiscula Neckaja 1958 BB61
    |    `--*L. arcuaris Neckaja 1958 BB61
    |--Pseudobythocypris Shaver 1958 BB61
    |    `--*P. pediformis (Knight 1928) [=Bythocypris pediformis] BB61
    |--Silenis Neckaja 1958 BB61
    |    `--*S. subtriangulatus Neckaja 1958 BB61
    |--Arcuaria Neckaja 1958 WSB93, BB61
    |    `--*A. sineclivula Neckaja 1958 BB61
    |--Bairdiocypris Kegel 1932 BB61
    |    |--*B. gerolsteinensis (Kegel 1932) [=Bythocypris (*Bairdiocypris) gerolsteinensis] BB61
    |    `--B. nexheimensis BB61
    |--Condracypris Roth 1929 BB61
    |    |--*C. binoda Roth 1929 BB61
    |    `--C. circumvallata BB61
    |--Reversocypris Přibyl 1955 BB61
    |    |--*R. regularis Přibyl 1955 BB61
    |    `--R. klukovicensis BB61
    `--Healdianella Posner 1951 CB86
         |--*H. darwinulinoides Posner 1951 BB61
         |--H. miaohuangensis Wang 1983 CB86
         `--H. subcuneola Posner 1951 S82

*Type species of generic name indicated


[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.

[S82] Shi C.-G. 1982. Some early Carboniferous ostracodes from Nylam, Xizang (Tibet). Acta Palaeontologica Sinica 21 (3): 309–314.

[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.

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