Belongs within: Rotaliida.Contains: Anomalinidae, Trichohyalidae, Gavelinella, Parrelloididae, Discorbinellidae, Cancrisidae, Eponididae, Rosalinidae. The Siphoninidae are a group of Foraminifera known from the Eocene to the present, commonly bearing a frilled keel around the outer edge of the test (Loeblich & Tappan 1964). <==RosalinidaM13 |–GavelinelloideaM13 | |–AnomalinidaeM13 | |–TrichohyalidaeM13 | |–GavelinellidaeM13 | | |–GavelinellaM13 | | |–Brotzenella… Continue reading Rosalinida


Belongs within: Foraminifera. The Hyperamminidae were treated by Cushman (1940) as a family of Foraminifera with an elongate, undivided, agglutinate test. The Hippocrepininae (with test free) and Dendrophryinae (with test attached) were later placed by Loeblich & Tappan (1964) as independent subfamilies within the family Astrorhizidae; as the latter group is now known to be… Continue reading Hippocrepinida


Belongs within: Rotaliida. The Uvigerinidae are a group of foraminiferans known from the Upper Cretaceous to the present (Loeblich & Tappan 1964b). Characters (from Loeblich & Tappan 1964b): Test triserial to biserial in early stage, later may become biserial or uniserial; aperture terminal with neck and internal tooth plate connecting apertures of successive chambers. <==Uvigerinidae… Continue reading Uvigerinidae


Belongs within: Rotaliida. The Buliminidae are a group of Foraminifera known from the Palaeocene to the present. Members of the type genus Bulimina have a tooth plate with a developed border, and with one shank free and the other fixed to the internal chamber wall below the aperture (Loeblich & Tappan 1964b). Characters (from Loeblich & Tappan… Continue reading Buliminidae


Belongs within: Bolivinitida. The Bolivinitidae are a group of primarily biserial Foraminifera known from the Upper Triassic to the present. Members of the type genus Bolivinita have a compressed test that is rectangular in cross-section, with a comma-shaped basal aperture bearing a bordering lip (Loeblich & Tappan 1964). The bolivinitids Published 30 October 2021 The… Continue reading Bolivinitidae


Belongs within: Endothyroida. Teardrops in the Palaeozoic Published 29 July 2022 Among the early major radiations of foraminiferans in the Palaeozoic era was the assemblage known as the endothyroids, regarded by most researchers as the fore-runners of the iconic fusulinoids*. Like fusulinoids, endothyroids had test walls constructed of microgranular calcite, but generally had a simpler… Continue reading Chernyshinelloidea


Belongs within: Miliolina. On Pyrgoidae Published 15 August 2020 I have referred in the past to there being something of a divide in approaches to the classification of the Foraminifera. This divide arises from disagreements such as the relative significance of various character complexes. One taxon that stands as an example of such disagreements is… Continue reading Pyrgoidae


Belongs within: Fusulinoida. Rugosofusulinids? Published 14 March 2020 We return once again to the fusulinoids, large, complex Foraminifera of the late Palaeozoic. For this post, I’m taking a look at the Rugosofusulinidae, a group known from the last part of the Carboniferous and the earliest part of the Permian. Or to put it more technically,… Continue reading Rugosofusulinidae


Belongs within: Globothalamea. Holding forams together Published 28 February 2018 In past posts relating to the Foraminifera, I’ve made reference to the changes in classification undergone by this group over the years. Forams are unusual among unicellular organisms in producing a hard, often complex test that means they have both left an extensive fossil record… Continue reading Nouriida


Belongs within: Tubothalamea.Contains: Patellinida, Spirillinidae, Cymbaloporidae, Involutinidae, Lasiodiscidae, Tetrataxidae, Archaediscidae. The forams that bind Published 18 December 2017 Here we see an example of Fabiania. Fabiania is a genus of foraminiferan known from the Eocene epoch that could reach a relatively large size as forams go, up to several millimetres across (nowhere near as large… Continue reading Spirillinana