Belongs within: Pentamerida. The Huenellidae Published 4 April 2022 Researchers who deal with the modern marine fauna are used to thinking of brachiopods as a marginal group, their diversity greatly overshadowed on a global scale by the superficially similar bivalves. However, modern brachiopods are but a shadow of their former selves; for much of the… Continue reading Huenellidae


Belongs within: Rhynchonellida. The Oligorhynchiidae Published 11 September 2021 From Oligochiton, we move onto Oligorhynchia. The Oligorhynchiidae are a family of very small brachiopods known from the Middle and Late Ordovician. They were among the earliest representatives of the Rhynchonellida, a major group of brachiopods that survives to the present day. Rhynchonellidan shells are usually… Continue reading Oligorhynchiidae


Belongs within: Brachiozoa. Ice-cream cones of the early Palaeozoic Published 3 May 2019 It’s time for something I haven’t done in a very long time… (credit to Neil from Microecos): I briefly described tentaculitoids on this site way back in September 2007. These narrowly conical shells of uncertain affinities were prominent members of the marine… Continue reading Dacryoconarida


Belongs within: Enteletida. Uncertain Dalmanella Published 26 December 2018 The photo above (copyright Dave), may or may not show Dalmanella, a brachiopod originally described from the later Ordovician of Sweden. Dalmanella belongs to the Orthida, one of the earliest groups of articulate brachiopods to appear in the fossil record (‘articulate’ meaning that the two valves… Continue reading Dalmanellidae


Belongs within: Rhynchonellida. The Camarotoechiidae are a group of medium-sized to large brachiopods known from the Silurian to the Permian (Ager et al. 1965). Characters (from Ager et al. 1965): Medium-sized to large, round or elliptical in outline, sides and front never truncated; costae generally rounded. Brachial valve with high median septum or ridge; hinge… Continue reading Camarotoechiidae


Belongs within: Spiriferida. The Delthyrididae are a group of spiriferid brachiopods known from the Lower Silurian to the Middle Devonian (Boucot et al. 1965). Characters (from Boucot et al. 1965): Biconvex, weakly to strongly transverse; lateral slopes plicate or costate; fold and sulcus smooth or with median rib in sulcus and median groove on fold;… Continue reading Delthyrididae


Belongs within: Spiriferida.Contains: Cyrtospirifer. The Cyrtospiriferoidea are a group of Devonian spiriferids characterised by the presence of a delthyrial plate. <==CyrtospiriferoideaRG04 |–Spinocyrtiidae [Guerichellinae, Spinocyrtiinae]RG04 | |–Acutatheca Stainbrook 1945BJ65 | | `–*A. propria Stainbrook 1945BJ65 | |–Alatiformia Struve 1963M65 | | `–*A. alatiformis (Drevermann 1907) [=Spirifer alatiformis]M65 | |–Allanella Crickmay 1953 [=Allanaria Crickmay 1953]BJ65 | |… Continue reading Cyrtospiriferoidea


Belongs within: Hyolitha. The Circothecida are a group of hyoliths in which the dorsum and venter are undifferentiated or weakly differentiated (Kruse 2002). <==Circothecida | i. s.: Conotheca Missarzhevksy in Rozanov et al. 1969D94, KB09 | |–C. australiensis Bengtson in Bengtson et al. 1990K02 | |–C. circumflexa Missarzhevksy in Rozanov et al. 1969KB09 | `–C.… Continue reading Circothecida

Categorised as Hyolitha


Belongs within: Linguliformea. The acrotretids: micro-brachiopods from the dawn of… brachiopods Published 15 July 2015 When brachiopods have been featured on this site before, they have generally been representatives of the group known as the articulates. Today’s subjects, the Acrotretidae, are instead members of the inarticulate brachiopods. Whereas the shells of articulate brachiopods have a… Continue reading Acrotretidae


Belongs within: Terebratulida. The cancellothyridids: a modern success story Published 3 June 2015 As has been noted on this site more than once before, brachiopods are a group of animals probably more familiar to the student of palaeontology than of zoology. From the brief gloss that tends to be their only coverage in textbooks, one… Continue reading Cancellothyrididae