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Taxonomy
Cardium pygmaeum was named by Hisinger (1837). It is a 3D body fossil. Its type locality is Porkuni, Siuge Member, which is in a Porkuni perireef or subreef lime mudstone/chert in the Ärina Formation of Estonia.
It was recombined as Pleurorhynchus pygmaea by Barrande (1881); it was recombined as Conocardium pygmaea by Branson (1942); it was recombined as Hippocardia pygmaea by Pojeta and Runnegar (1976); it was recombined as Pojetaconcha pygmaea by Wagner (2023).
It was recombined as Pleurorhynchus pygmaea by Barrande (1881); it was recombined as Conocardium pygmaea by Branson (1942); it was recombined as Hippocardia pygmaea by Pojeta and Runnegar (1976); it was recombined as Pojetaconcha pygmaea by Wagner (2023).
Sister species lacking formal opinion data
C. alabamense, C. cedrelarum, C. cottaldinum, C. erinaceum, C. heinzelini, C. hernandoense, C. hispidiforme, C. knappi, C. latisulcum, C. leucostoma, C. lineolatum, C. lithopodolicum, C. pauperculum, C. problematicum, C. rouyanum, C. scabrum, C. schweinfurthi, C. transcarpaticum, C. triangulatum, C. vindobonense, C. volckmanni, C. colosseum, C. estacianum, C. sellardsi, C. triboleti, C. hanpeizanense, C. anclotense, C. brooksvillense, C. coutinhoi, C. hernandoense, C. hortensium, C. leucostomum, C. plectopleura, C. ustrix, C. viridarii, C. colosseum
Synonymy list
| Year | Name and author |
|---|---|
| 1837 | Cardium pygmaeum Hisinger p. 63 figs. pl. 19 f. 6a-c |
| 1881 | Pleurorhynchus pygmaea Barrande p. 107 |
| 1942 | Conocardium pygmaea Branson p. 388 |
| 1976 | Hippocardia pygmaea Pojeta and Runnegar p. 76 figs. pl. 50 f. 3 |
| 2023 | Pojetaconcha pygmaea Wagner p. S3096 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Cardium pygmaeum Hisinger 1837
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Diagnosis
No diagnoses are available