Stearn, Colin W. Department of Earth and Planetary Sciences, McGill University, Montreal, Ontario, Canada.
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An informal group of Late Paleozoic and Early Mesozoic calcareous fossils of laminar, bulbous, and cabbagelike form and layered internal structure that formed reeflike bodies. The disjectoporids have been considered to be either hydrozoans or sponges and are similar in form, structure, and habitat to the Paleozoic stromatoporoids; however, they are separated from them and the “Mesozoic stromatoporoids” (sphaeractinids) by both time and basic structure. The typical genera Disjectopora, Arduorhiza(as Carterina), and Irregulopora were established by Waagen and Wentzel from Late Permian rocks of the Salt Range of Pakistan. Although some specimens of disjectoporids have been identified from Jurassic rocks, the youngest certain disjectoporids occur in Late Triassic beds. See also: Hydrozoa; Sclerosponges; Sphaeractinoidea; Stromatoporoidea
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