In communities vrchnojurských bentóznych organisms molluscs were among the major representatives. C

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In communities vrchnojurských bentóznych organisms molluscs were among the major representatives. Clams were widespread group of marine invertebrates and in some associations reached compared to other animals significantly higher diversity. One of the sites of the Late Jurassic, where you can observe bivalvií dominance over other representatives organisms quarry near the village Malogoszcz in Poland. steam box On this important Polish steam box sites, which forms across the board rather massive quarry are exposed carbonate facies steam box of the upper Jurassic pointing to different types of former Shallow water, as well as the deeper sea environment. The fracture is exposed predominantly layers of limestone, marl as well kimeridžského steam box age (155.7 to 150.8 million. steam box R.). Some facies are rich in fossil remains of marine Evertebrata, the walls of the quarry is in some places can monitor the position of lumachelovým steam box accumulation of shells steam box of marine fossil fauna, with a predominance of molluscs steam box ("shell beds"). In the Community bivalvií dominated oyster families Ostreidae and Gryphaeidae. Belongs to the family Ostreidae species Actinostreon gregareum (J. Sowerby), whose mailbox is on that site found in abundance; many specimens is preserved with articulated shells. Surface shell that taxon is decorated with distinctive unequal steam box transverse ribs. Family Gryphaeidae represent species Nanogyra virgula (DEFRANCE) steam box Nanogyra nana (J. Sowerby) and Deltoideum delta (SMITH). steam box Mailboxes representatives of the genus Nanogyra also form in certain positions lumachely. Based on the findings, it is clear that due to the solid support on the seabed they were often forced to cast bivalve shellfish cleave the other. steam box Their shells are often found in mussel shoals and the boxes rare ammonites, as well as larger boxes related oysters of the genus Deltoideum. Shells of adult individuals grow to a relatively small size. Right shells are massive, arched; left box are significantly plochejšieho, slightly undulating shape. Type Deltoideum delta (SMITH) below the site such high abundance, as the previous three taxa. Mailboxes's major bivalvií decorated with irregular insignificant incremental lines. Seashells some individuals were sometimes covered with numerous small colonies of oysters of the genus Nanogyra. By way of life is to classify oysters sessile epifaune of trophic point of view they are attributable to filtrators (suspension eaters).
Actinostreon gregareum (J. Sowerby)
Bivalve steam box molluscs Deltoideum delta (SMITH) Source: Radoslav Biskupič
Ostracoda (Ostracoda)
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