The Ammolagenidae: a new family of Foraminifera, and the evolution of multichambered tests

One hundred and sixty specimens of Ammolagena clavata (Jones and Parker), encrusted on various bioclastic substrates, were collected from recent foredeep sediments of the Pontine Archipelago (Tyrrhenian Sea). Numerous specimens were measured, photographed, and analyzed, using energy dispersive spectrometry (EDS). The wall of A. clavata is composed of an agglutinated layer between two organic films. An EDS analysis showed high concentrations of Si and, subordinately, Al, both in the agglutinated and organic layers; the latter also contain high amounts of Fe. The presence of an incipient lip (pseudoseptum) at the beginning of the tubular chamber confirms the pseudo-bichambered architecture of the test. Its most problematic morphological feature is a second aperture at the base of the first chamber (proloculus). The variable morphology of the second pseudochamber is interpreted to be an adaptive behavior for avoiding occlusion of its aperture by the sediment. The presence of coccoliths and coccospheres within the chambers suggests that A. clavata is a suspension feeder. The upper limit of its bathymetric range in the Mediterranean Sea coincides with the upper unit of Mediterranean Levantine Intermediate Water

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Evolution of Trochamminoids (Trochospiral Organic-Cemented Agglutinated Foraminifera): Examples from the Lower Permian of Western Australia

Tremblin,

Haig

2023

Journal of Foraminiferal Research

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Trochamminids are the oldest trochospiral group of foraminifera. An exceptionally well-preserved assemblage, found in the Lower Permian (Sakmarian, ∼294–290 Ma) of Western Australia, includes Trochammina geoffplayfordi n. sp., Trochammina gloveri n. sp., Trochamminopsis teicherti n. sp., and Tritaxis crespinae n. sp. Verispira holmesorum n. sp. seems related to broader Trochamminoidea. These represent the oldest known well-preserved representatives of the superfamily. By the Sakmarian, trochamminids, remarkably like modern species, had developed in a shallow-water interior sea with muddy substrate; some may have lived in the flocculent surface layer of the mud, and some were epibionts. No potential trochospiral ancestor is known among calcareous foraminifera of the Late Paleozoic. Triassic Duostomina seems to be the oldest calcareous taxa with simple trochospiral coiling (also having an inner organic lining). Molecular analyses of modern species suggest that morphotypes like the Permian Trochammina lie at some genetic distance from Trochammina inflata (type species of the genus).

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The Ammolagenidae: a new family of Foraminifera, and the evolution of multichambered tests

Cited by 4 publications

References 10 publications

Distribution patterns of epibiotic macrobenthic foraminifera associated to coralligenous habitats of the strait of Gibraltar

Distribution patterns of epibiotic macrobenthic foraminifera associated to coralligenous habitats of the strait of Gibraltar

New Observations on Ammolagena Clavata (Jones and Parker, 1860) From the Mediterranean Sea

Evolution of Trochamminoids (Trochospiral Organic-Cemented Agglutinated Foraminifera): Examples from the Lower Permian of Western Australia

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