Spiegler, Dorothee and Eiserhardt, Klaus H. (2002) First Evidence of Colonial Bicorniferidae (Bryozoa incertae sedis). In: Northern European Cenozoic Stratigraphy, Proceedings 8th Biannual Meeting RCNNS/RCNPS. , ed. by Guers, K.. LANU, Flintbek, pp. 7-14.

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Abstract

Voorthuysenie/la incrustans n. sp. is
introduced as an incrusted taxon from
the Geulhem Chalk, Houthem Formation,
lower Dano-Montian, at Curts Quarry
near Maastricht (Netherlands). The four
colonies of basal zooecia observed are
cemented to the substrate directly or by
protrusive borders. They are arranged
uni- and biserially or on a plane. The
classification of this new species into the
Voorthuyseniella genus depends on the
subrounded zooecia with an upwardoriented
frontal pore (aperture) and lateral
pores.
Until recently, only isolated chambers
of Voorthuyseniella have been found.
The connected bases of Voorthuyseniella
studied in this paper are the first fossil
proof of a colonial growth mode with
encrusting bases. II. incrustans is the
oldest species of the genus. Therefore,
the assumption that Voorthuyseniella
was separated phylogenetically from
Bicornifera during the Eocene must be
revised.
The great zooecial variability in of
Voorthuyseniella incrustans colonies
may imply the possibility that the
morphological differences of some of the
known Voorthuyseniella species reflect
only their special position in the colony.

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