Tube microstructure of Recent and Jurassic serpulid polychaetes and the question of the Palaeozoic spirorbids

• Autorzy: Weedon M J
• Języki publikacji: EN

Abstrakty

EN

'Ordered' and 'unordered chevron structures' in serpulid tubes comprise minute calcite lath-like crystals. In ordered chevron structure (Pomatoceros triqueter) the crystals parallel each other within each chevron layer, whilst between layers the alignment direction alternates. The laths have no alignment in unordered chevron structure (Spirorbis and locally in Pomatoceros triqueter). In 'homogeneous chevron structure' (found in Jurassic pomatocerids) the layers comprise a granular or homogeneous fabric. This structure possibly represents a diagenetic replacement of lath-like crystals. Serpulid chevron structures are quite dissimilar from any shell microstructures described in molluscs or lophophorates. The secretion of microstructures comprising lath-like crystals may have allowed rapid tube growth. Spherulitic prismatic structure is identified in Spirorbis; the structure occurs locally in the outer part of the tube. The microstructure of Recent spirorbids is quite dissimilar to that of Palaeozoic fossils (microconchids) previously assigned to the genus Spirorbis.

PL

Mikrostruktura kalcytowych rurek wieloszczetów z rodziny Serpulidae jest zupełnie odmienna od mkrostruktur występujących w muszlach mięczaków i ramienionogów, czy też w zooeciach mszywiołów. Nie jest również podobna do struktury ścianek paleozoicznych skamieniałości tradycyjnie uważanych za rurki wieloszczetów Spirorbis. W poprzednich pracach autora zostało wykazane, że paleozoiczne spirorbidy miały mikrostrukturę identyczną jak grubościenne tentakulity, ramienionogi i mszywioły. Na tej podstawie reaktywowana została nazwa rodzajowa Microcornus, użyta niegdyś do tych skamieniałości, i utworzony został rząd Microconchida, wraz z pokrewnym Trypanoporida włączony do gromady Tentaculita.

Słowa kluczowe

PL

fauna kopalna; paleocen; wieloszczety; skamienialosci; Spirorbis; rurki kalcytowe; jura; cechy morfologiczne; mikrostruktura; paleontologia; Serpulidae

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1994
• Tom: 39
• Numer: 1
• Opis fizyczny: s.1-15,rys.,fot.,bibliogr.

Twórcy

autor

Weedon M J

• Department of Geology, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, UK

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