Sixty-two Middle Devonian brachiopod species are described on the basis of >1300 specimens from the Taboumakhlouf Formation (and subordinately probably also from the top of the El Otfal Formation) at Madene el Mrakib (middle to late Eifelian or early Givetian?), Aferdou el Mrakib (late Eifelian to middle Givetian), and Guelb el Maharch (early Givetian) on the southern edge of the Maider Syncline (eastern Anti-Atlas, Morocco). Representatives of Craniida (2 taxa), Strophomenida (5), Productida (2), Orthotetida (2), Orthida (5), Pentamerida (5), Rhynchonellida (9), Atrypida (14), Athyridida (7), Spiriferida (9), and Spiriferinida (2) are present. The fauna is dominated quantitatively by the Atrypida (24% of taxa, about the half of specimens, and the commonest species Atryparia dispersa making up about 13% of the material); the Rhynchonellida (16% of taxa, about one-sixth of specimens) are the second largest order. A new genus of the family Pugnacidae (order Rhynchonellida), Paulinaerhynchia , is proposed with the type species P. paulinae gen. et sp. nov. from Maharch; it is closest to Pugnax , from which it differs in distinct costation, lack of a dorsal septum and septalium, and rudimentary dental plates. Desquamatia (D.) deserti sp. nov., a large and finely costate representative of the genus, is described also from Maharch. Antirhynchonella and Glosshypothyridina are reported for the first time or con- firmed to be present in the Givetian. Forty (possibly up to 46) species (71 or possibly up to 82% of the taxa identified at the species level) are present also in either Eifel (Germany) or the Holy Cross Mountains (Poland). Such a high ratio of species in common attests to unconstrained faunal exchanges among benthic faunas between the northern and southern shores of the Variscan Sea during the Middle Devonian. This favours the palaeogeographic hypothesis of a narrow Variscan Sea.

https://geojournals.pgi.gov.pl/asgp/article/download/16451/13635

Shell structure of the Devonian retziid brachiopod Plectospira ferita

Middle Devonian brachiopods from the southern Maїder (eastern Anti-Atlas, Morocco)

A new gastropod, Kaneconcha knorri gen et sp. nov., was found in marlstone dredged from the surface of Adam Dome at Kane Megamullion on the flank of the Mid-Atlantic Ridge in an area of former hydrothermal activity. The snail is interpreted as a large provannid similar to the chemosymbiotic genera Ifremeria and Alviniconcha. This is the first record of presumably chemosymbiotic provannids from the Atlantic Ocean and also the first fossil record of such large provannids associated with hydrothermal venting. Extant Alviniconcha and Ifremeria are endemic to hydrothermal vents in the Pacific and Indian oceans. Kaneconcha differs from Ifremeria in having no umbilicus and a posterior notch, and from Alviniconcha in having the profile of the whorl slightly flattened and having no callus on the inner lip. A dark layer covering the Kaneconcha shell is interpreted here as a fossilized periostracum. The shell/periostracum interface shows fungal traces attributed to the ichnospecies Saccomorpha clava. We hypothesize ...

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/pdf/a-new-late-pliocene-large-provannid-gastropod-associated-4p9tyyol87.pdf

A new Late Pliocene large provannid gastropod associated with hydrothermal venting at Kane Megamullion, Mid-Atlantic Ridge

A new neoretziid brachiopod genus, Coveenia, from the Lower Carboniferous of western Europe is erected; the type species is Coveenia ulothrix (de Koninck, 1843), and C. buchiana (de Koninck, 1843, sensu 1887) and C. tilsleia sp. nov. are included, diagnosed and described. Neotypes are selected and illustrated for C. ulothrixC. buchiana.

https://www.onlinelibrary.wiley.com/doi/pdf/10.1111/1475-4983.00151

Shell structure of the Devonian retziid brachiopod Plectospira ferita

Citations

Middle Devonian brachiopods from the southern Maїder (eastern Anti-Atlas, Morocco)

A new Late Pliocene large provannid gastropod associated with hydrothermal venting at Kane Megamullion, Mid-Atlantic Ridge

A Review Of Two De Koninck Retzioid Brachiopod Species, And Description Of A New Genus From The Carboniferous Of Europe

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