(From left to right) Left, right, left interior, ventral and dorsal views of Healdia simplicissima, from Hoare & Merrill (2004).

Belongs within: Ostracoda.

The Healdiidae are a group of ostracods known from the Devonian to the Lower Cretaceous (Benson et al. 1961).

Characters (from Benson et al. 1961): Carapace convex-backed, with suboblong to subtriangular outlines and nearly straight venters in lateral view, commonly with posterior, and less commonly with anterior sculpturing in ridges and spines; valves hinged posterodorsally; left valve larger than right valve, overlap and overreach (where present) left valve over right valve. Without separated calcified inner lamellae but with hinges and contact margins simply ridged and grooved or shouldered in platycopine fashion; adductor muscle scar circular, consisting of numerous spots generally arranged in concentric rings or rows. Most genera probably exhibit moderate sexual dimorphism.

    |--Seminolites Coryell 1928 HM04
    |    |--S. ovalis Cooper 1941 HM04
    |    |--S. perforatus Harlton 1933 HM04
    |    |--S. porosus Robinson 1978 HM04
    |    |--S. symmetricus Cooper 1941 HM04
    |    `--S. truncatus Coryell 1928 HM04
    |--Cribroconcha Cooper 1941 HM04
    |    |--C. alabamensis (Erlich 1964) HM04
    |    |--C. conspicua (Harlton 1929) HM04
    |    |--C. costata Cooper 1941 HM04
    |    |--C. fornicata Cooper 1941 HM04
    |    |--C. perplexa Robinson 1959 HM04
    |    `--C. prolixa Hoare & Merrill 2004 HM04
    |--Microcheilinella Geis 1933 HM04
    |    |--M. acuta Shi 1987 ZL87
    |    |--M. cordata Cooper 1941 S82
    |    |--M. monospinosa Zhang in Zhang & Liang 1987 ZL87
    |    |--M. postspinosa Chen 1958 ZL87
    |    |--M. speciosa Chen 1958 CB86
    |    |--M. subreniformis Chen 1958 ZL87
    |    `--M. venusta Chen 1958 ZL87
    `--Healdia Roundy 1926 HM04
         |--H. ampla Roundy 1926 HM04
         |--H. asper Cooper 1946 HM04
         |--H. caneyensis Harlton 1927 HM04
         |--H. cornigera (Jones & Kirby 1867) HM04
         |--H. glennensis Harlton 1927 HM04
         |--H. marginata Harlton 1928 HM04
         |--H. oblonga Bradfield 1935 HM04
         |--H. oklahomaensis Harlton 1927 HM04
         |--H. simplicissima Harlton 1933 HM04
         `--H. sulcata Cooper 1947 S82

*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.

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

[ZL87] Zhang X.-J. & Liang X.-Y. 1987. Ostracoda from the Taiyuan Formation of Xingyang and Gong Xian districts, Henan. Acta Micropalaeontologica Sinica 4 (3): 293-312.

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