Sigmoilina is a miliolid genus, referring to the foraminiferal order Miliolida, characterized by an assymmetricall biconvex test formed by strongly overlapping chambers, one-half coil in length, that form a sigmoid (S-shaped) curve in cross section. The strongly overlapping chambers obliterate earlier ones from view resulting in the compressed biloculine appearance, differing from the squat, depressed biloculine form of Pyrgo and Biloculina. The test, as for all Miliolida, is porcelaneous and imperphorate, the terminal aperture, with tooth, the only point of egress and ingress for the animal.
Sigmoilina is a protist, or proctoctist according to B.K. Sen Gupta, 1999, included in the miliolid family Hauerinidae (Loeblich & Tappan, 1988). It was previously assigned to the Miliolidae (Loeblich & Tappan, 1964) when foraminifera were regarded as comprising a suborder (Foraminiferida).
Sigmoilina is a miliolid genus, referring to the foraminiferal order Miliolida, characterized by an assymmetricall biconvex test formed by strongly overlapping chambers, one-half coil in length, that form a sigmoid (S-shaped) curve in cross section. The strongly overlapping chambers obliterate earlier ones from view resulting in the compressed biloculine appearance, differing from the squat, depressed biloculine form of Pyrgo and Biloculina. The test, as for all Miliolida, is porcelaneous and imperphorate, the terminal aperture, with tooth, the only point of egress and ingress for the animal.
Sigmoilina is a protist, or proctoctist according to B.K. Sen Gupta, 1999, included in the miliolid family Hauerinidae (Loeblich & Tappan, 1988). It was previously assigned to the Miliolidae (Loeblich & Tappan, 1964) when foraminifera were regarded as comprising a suborder (Foraminiferida).
Sigmoilina es un género de foraminífero bentónico de la subfamilia Sigmoilinitinae, de la familia Hauerinidae, de la superfamilia Milioloidea, del suborden Miliolina[1] y del orden Miliolida.[2] Su especie tipo es Planispirina sigmoidea. Su rango cronoestratigráfico abarca desde el Burdigaliense (Mioceno inferior) hasta la Actualidad.
Se han descrito numerosas especies de Sigmoilina. Entre las especies más interesantes o más conocidas destacan:[3][4][5]
Un listado completo de las especies descritas en el género Sigmoilina puede verse en el siguiente anexo.
Datos: Q20720306
Especies: Sigmoilina
Sigmoilina es un género de foraminífero bentónico de la subfamilia Sigmoilinitinae, de la familia Hauerinidae, de la superfamilia Milioloidea, del suborden Miliolina y del orden Miliolida. Su especie tipo es Planispirina sigmoidea. Su rango cronoestratigráfico abarca desde el Burdigaliense (Mioceno inferior) hasta la Actualidad.
