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By F T Fursich

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Additional info for Benthic macroinvertebrate associations from the Boreal Upper Jurassic of Milne Land, central East Greenland

Example text

T h e dominance of infauna is due largely to several species of Pleu­ romya, Astarte, and in particular to the small Isocyprina. Although the latter occu­ pies the first rank in terms of numerical abundance, it is probably the large Pinna lanceolata which, though occupying rank four in terms of numerical abundance, dominates the association in terms of biomass. A s in most other associations, nearly all organisms were suspension-feeders ( 9 7 % ) . A wide range of different life habit groups is represented, the commonest being shallow infaunal suspension-feeding bivalves.

T h e G. keyserlingii association occurs in fine to very fine-grained micaceous shales and sandstones, which contain only few glauconite grains. Grammatodon keyserlingiilTaimyrothyris sp. nov. association Table 12, figs 19, 21 The G. key serlingiil Taimyrothyris sp. nov. association is represented by eight collections with 1083 specimens. There are three species in the trophic nucleus: the semi-infaunal bivalve G. keyserlingii, the brachiopod Taimyrothyris and the semiinfaunal bivalve Isognomon volaticum.

A. veneris Mesosaccella choroschowensis Limatula consobrina multicostata Placunopsis radiata Pleuromya triangularis Pholadomya hemicardia Inoceramus sp. cf. Corbicellopsis Goniomya sp. 5%) Sulcoactaeon peroskianus Pseudomelania sp. 1%) Dentalium sp. 3%) "Taimyrothyris sp. nov. 'Rhynchonella' sp. nov. 0%) Serpula intestinalis Serpula (Cycloserpula) sp. 1%) cidaroid echinoid Trace fossils mantled vertical tubes Macaronichnus segregatis Diplocraterion habichi Thalassinoides suevicus Curvolithus sp.

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Benthic macroinvertebrate associations from the Boreal Upper Jurassic of Milne Land, central East Greenland by F T Fursich


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