Dibrachicystis

Dibrachicystis Temporal range: Stage 5 PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Superphylum:	Deuterostomia
Phylum:	Echinodermata
Subphylum:	†Blastozoa
Class:	†Eocrinoidea
Subclass:	†Rhombifera
Family:	†Dibrachicystidae
Genus:	†Dibrachicystis Zamora & Smith, 2011
Species
†D. purujoensis Zamora & Smith, 2011 (type)

Dibrachicystis is an extinct genus of rhombiferan echinoderm from the early Middle Cambrian (Cambrian Series 3, Stage 5, 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]

Phylogeny

Cladogram after Zamora & Smith, 2011:^[1]

Eocrinoidea	Kinzercystis Lyracystis Titanocrinus Aethocrinus Gogia Sinoeocrinus Akadocrinus Tatonkacystis Ubaghsicystis Dibrachicystis Pleurocystites Veleiuxicystis Macrocystella Ridersia

References

1. ^ ^{a b} Samuel Zamora and A. B. Smith (2011). "Cambrian stalked echinoderms show unexpected plasticity of arm construction". Proceedings of the Royal Society B in press. doi:10.1098/rspb.2011.0777. http://rspb.royalsocietypublishing.org/content/early/2011/06/03/rspb.2011.0777.abstract.