Pleurostomellidae

Belongs within: Polymorphinida. The Pleurostomellidae are a group of Foraminifera known from the Lower Cretaceous (possibly Jurassic) to the present, characterised by the presence of an internal siphon running between the apertures of successive chambers (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Early stage triserial or biserial, later uniserial, or uniserial throughout;… Continue reading Pleurostomellidae

Nodosariidae

Belongs within: Nodosariina. The Lagenidae are a group of Foraminifera known from the Permian to the present. They are divided between three subfamilies, which may be distinguished by the shape of the aperture: rounded or radiate in Nodosariinae, a single elongate slit in the Lingulininae, or dentate or cribrate in the Plectofrondiculariinae. The chambers of… Continue reading Nodosariidae

Glandulinidae

Belongs within: Polymorphinida. The Glandulinidae are a group of forams known from from the Jurassic to the present, characterised by the presence of a simple internal tube behind the terminal aperture (Loeblich & Tappan 1964). The glandulinid position Published 25 September 2020 In an earlier post, I described how the majority of modern multi-chambered foraminiferans… Continue reading Glandulinidae

Polymorphinidae

Belongs within: Polymorphinida.Contains: Guttulina. The Polymorphinidae are a group of multichambered forams known from the Triassic to the present (Loeblich & Tappan 1964b). Characters (from Loeblich & Tappan 1964b): Test multilocular, chambers in spiral or sigmoidal coil about longitudinal axis of growth, or biserial or uniserial, typically somewhat overlapping; aberrant forms may be irregular and… Continue reading Polymorphinidae

Palaeotextulariidae

Belongs within: Nodosariana. The Palaeotextulariidae are a group of primarily biserial Foraminifera known from the Carboniferous and Permian. In some genera (Palaeotextularia and Deckerellina) the test remained biserial throughout, but in others (Climacammina, Cribrogenerina and Palaeobigenerina) it became uniserial in later stages of development (Loeblich & Tappan 1964). Characters (from Loeblich & Tappan 1964): Test… Continue reading Palaeotextulariidae

Earlandiidae

Belongs within: Nodosariida. The Earlandiidae are a group of Foraminifera known from the Ordovician to the Carboniferous, with a free test that is tubular or uniserial (Loeblich & Tappan 1964). Earlandiidae [Earlandiinae] |–Lugtonia Cummings 1955LT64 | `–*L. concinna (Brady 1876) [=Nodosinella concinna]LT64 |–Saccamminopsis Sollas 1921 [incl. Carteria Brady in Moore 1870 nec Diesing 1866 nec… Continue reading Earlandiidae

Nodosariana

Belongs within: Foraminifera.Contains: Palaeotextulariidae, Nodosariida, Polymorphinida, Ellipsolagenidae, Lagena, Globivalvulinidae, Lenticulina, Marginulina, Lingulinidae. The Lagenida are a group of foraminifera with a low-magnesium, calcitic secreted test that is monolamellar and radial (Groves et al. 2004) They first appeared in the middle late Carboniferous, though they did not become prominent until the Middle Permian (Grobes et al. 2003). <==Nodosariana [Biseriamminacea,… Continue reading Nodosariana

Geinitzinidae

Belongs within: Nodosariina. The Geinitzinidae are a group of uniserial foraminifera known from the Late Carboniferous and Permian, with an ancestrally atelo-monolamellar (i.e. lacking secondary lamellarity), hyaline-radial wall structure. In the derived genus Pachyphloia, the wall becomes plesio-monolamellar, with secondary lamellae enveloping some but not all previous chambers (Groves et al. 2003). Geinitzinidae [Geinitzinacea] |… Continue reading Geinitzinidae