Belongs within: Punciocopida.
The Graviidae are a group of Palaeozoic ostracods characterised by a carapace with epibolic ventral margins.
<==GraviidaeM61
|--Gravia Polenova 1952 (n. d.)BB61
| `--*G. aculata Polenova 1952BB61
|--Pribylina Ivanova 1959LH61
| `--*P. levis Ivanova 1959LH61
|--Boucekites Přibyl 1951M61, BB61
| `--*B. devonicus Přibyl 1951BB61
|--Selebratina Polenova 1952 (n. d.)M61, BB61
| `--*S. dentata (Polenova 1952) [=Gravia (*Selebratina) dentata]BB61
|--Pinnatulites Hessland 1949M61, BB61
| `--*P. procera (Kummerow 1924) [=Primitiella procera]BB61
`--Ceratocypris Poulsen 1934M61, BB61
|--*C. symmetrica Poulsen 1934BB61
`--C. longispinaBB61
*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.
[LH61] Levinson, S. A., & H. V. Howe. 1961. Addendum. In: Moore, R. C. (ed.) Treatise on Invertebrate Paleontology pt Q. Arthropoda 3: Crustacea: Ostracoda pp. Q421–Q422. Geological Society of America and University of Kansas Press.
[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.