Microscopic evidence of serpulid affinities of the problematic fossil tube ‘Serpula’ etalensis from the Lower Jurassic of Germany

Authors

  • OLEV VINN,

  • MANFRED JÄGER,

  • KALLE KIRSIMÄE


Olev Vinn [olev.vinn@ut.ee], Department of Geology, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia; Manfred Jäger [manfred.jaeger@holcim.com], Holcim (Baden-Württemberg) GmbH, D-72359 Dotternhausen, Germany; Kalle Kirsimäe [kalle.kirsimae@ut.ee], Department of Geology, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia; manuscript received: 30/9/2007; manuscript accepted: 20/12/2007.

Abstract

Tube structure, ultrastructure and mineralogy support serpulid affinities of the problematic worm fossil ‘Serpulaetalensis from the Lower Jurassic of Germany. The original tube mineralogy of ‘Serpulaetalensis is purely aragonitic and is preserved in Upper Pliensbachian specimens from eastern Germany. ‘Serpulaetalensis represent the earliest record of aragonitic mineralogy for serpulids. The tube is formed of irregularly oriented prismatic crystals that are 3–6 µm in length and 0.5–1.0 µm in diameter. Calcitic specimens of ‘Serpulaetalensis from Upper Sinemurian of southwestern Germany were recrystallized during the diagenesis and lack the original tube ultrastructure.

Ancillary