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- Pseudorthocerida is an order of generally straight longiconic orthoceratoids with a subcentral to marginal cyrtochoanitic siphuncle composed of variably expanded segments which may contain internal deposits that may develop into a continuous parietal lining. (Sweet 1964). Cameral deposits are common and concentrated ventrally. Apices typically have a slight to moderate exogastric curvature The Pseudorthocerida are included in a broad in-group of generally orthoconic cephalopods known as the Orthoceratoidea (Kroger 2008) along with the Ascocerida, Dissidocerida, Lituitida, and Orthocerida. The Pseudorthocerida were among the last living orthoconic nautiloids. One family, the , survived into the Triassic Period. (en)
- Псевдортоцеріди (Pseudorthocerida) — вимерлий ряд головоногих молюсків підкласу Наутилоїдеї (Nautiloidea). Ряд існував з силурійського по пермський період. Родина Trematoceratidae дожила до тріасового періоду. Молюски мали конусоподібну мушлю, яка у деяких видів сягада до 6 м. (uk)
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- Barskov 1963, from Flower & Caster, 1935 (en)
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- Reticycloceras, a Carboniferous pseudorthocerid (en)
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- Псевдортоцеріди (Pseudorthocerida) — вимерлий ряд головоногих молюсків підкласу Наутилоїдеї (Nautiloidea). Ряд існував з силурійського по пермський період. Родина Trematoceratidae дожила до тріасового періоду. Молюски мали конусоподібну мушлю, яка у деяких видів сягада до 6 м. (uk)
- Pseudorthocerida is an order of generally straight longiconic orthoceratoids with a subcentral to marginal cyrtochoanitic siphuncle composed of variably expanded segments which may contain internal deposits that may develop into a continuous parietal lining. (Sweet 1964). Cameral deposits are common and concentrated ventrally. Apices typically have a slight to moderate exogastric curvature The Pseudorthocerida are included in a broad in-group of generally orthoconic cephalopods known as the Orthoceratoidea (Kroger 2008) along with the Ascocerida, Dissidocerida, Lituitida, and Orthocerida. (en)
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- Pseudorthocerida (en)
- Псевдортоцеріди (uk)
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