Dibrachicystis

Dibrachicystis is an extinct genus of rhombiferan echinoderm from the early Middle Cambrian (Miaolingian, Wuliuan, about 510 Ma). It is a stalked echinoderm within the family Dibrachicystidae which lived in what is now northernmost Iberian Chains, northern Spain. It is known from the holotype MPZ2009/1230 and from the paratypes MPZ2011/2–6. It was found in the uppermost part of the Murero Formation at Purujosa, Moncayo Natural Park, dating to the Lower Languedocian and referred to the Solenopleuropsis thorali Zone. It was first named by Samuel Zamora and A. B. Smith in 2011 and the type species is Dibrachicystis purujoensis.[1]

Dibrachicystis
Temporal range:
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Subphylum:
†Blastozoa
Class:
†Eocrinoidea
Subclass:
†Rhombifera
Family:
†Dibrachicystidae
Genus:
†Dibrachicystis

Zamora & Smith, 2011
Species
  • †D. purujoensis Zamora & Smith, 2011 (type)

Phylogeny

Cladogram after Zamora & Smith, 2011:[1]

Eocrinoidea

Kinzercystis

Lyracystis

Titanocrinus

Aethocrinus

Gogia

Sinoeocrinus

Akadocrinus

Tatonkacystis

Ubaghsicystis

Dibrachicystis

Pleurocystites

Velieuxicystis

Macrocystella

Ridersia

References
  1. Samuel Zamora and A. B. Smith (2011). "Cambrian stalked echinoderms show unexpected plasticity of arm construction". Proceedings of the Royal Society B. 279 (1727): 293–298. doi:10.1098/rspb.2011.0777. PMC 3223674. PMID 21653588.


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