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Hoeverella krauseae gen. et sp. nov., an unusual uniserial cheilostome bryozoan from the campanian of hannover

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Kurzfassung

Hoeverellakrauseae gen. et sp. nov. ist eine eigenartige uniseriale, zu den Anasca gehörige cheilostome Bryozoen-Gattung. Es liegt nur ein einziges gut erhaltenes, einen Belemniten inkrustierendes Exemplar aus dem Untercampanium von Höver bei Hannover vor. Die Kolonie besteht aus ca. 60 spindel- bis birnförmigen Zooiden, von denen jedes eine kleine Mündung mit einer darin befindlichen ringförmigen Struktur aufweist. Ungewöhnlich für eine derartige Wuchsform ist, daß nur eine einmalige Verzweigung vorkommt. Für die Interpretation der ringformigen Struktur sind folgende Deutungen möglich: Regeneration, Verschluß der Opesia durch »closure plates«, Platznahme fremder Organismen in den Zooiden oder ringartige Gelenkpfannen für erekte oderAetea- anige Zooid-Röhren. Die systematische Stellung vonHoeverella ist unsicher. Vielleicht besteht eine verwandtschaftliche Beziehung zu der Electridae-GattungHerpetopora.

Abstract

Hoeverellakrauseae gen. et sp. nov. is a peculiar runner-like anascan cheilostome bryozoan known from a single well-preserved specimen encrusting a belemnite guard. The colony comprises about 60 zooids, each of fusiform/pyriform shape and having a small “opesia” within which is situated an enigmatic ring structure. Several interpretations are possible for the ring structure: “regeneration”, closure plate, foreign organism inhabiting the zooecium, or socket of articulation for an erect branch or anAetea- like erect distal tube. Unusually for a runner-like bryozoan only one branch ramification occurs in the entire colony. The systematic position ofHoeverella is uncertain; however, it may be related to the electrid genusHerpetopora.

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Authors and Affiliations

  1. Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD

    P. D. Taylor

  2. Geologisch-Palaontologisches Institut und Museum, Universitat Hamburg, Bundesstraße 55, D-2000, Hamburg 13, Germany

    E. Voigt

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  1. P. D. Taylor
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  2. E. Voigt
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Taylor, P.D., Voigt, E. Hoeverella krauseae gen. et sp. nov., an unusual uniserial cheilostome bryozoan from the campanian of hannover. Paläont. Z. 66, 115–122 (1992). https://doi.org/10.1007/BF02989481

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