Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

246
Remarks
Aglaophenia sibogae Billard, 1913 was first described
as a variety of A. pluma (Linnaeus, 1758).
Aglaophenia pluma is a species of the temperate
north-eastern Atlantic, but it also penetrates
into the western Mediterranean (Svoboda &
Cornelius 1991). It always has closed corbulae
and can also form branched colonies. Billard’s
Indonesian variant has open corbulae and referring
to the same arguments as given for Lytocarpia
orientalis (see above) it is here raised to
full species level.
Aglaophenia sibogae resembles closely A.
postdentata Billard, 1913 (for description see
also Millard & Bouillon 1973, Ryland & Gibbons
1991, Watson 1994). Billard (1913) distinguished
A. postdentata on account of the smaller
hydrothecae (depth 0.22–0.24 mm) and the presence
of a distinct cusp on the adcauline side of the
hydrothecal opening. The colony size of A. postdentata
does also not surpass 1 cm, while the
stems of Aglaophenia sibogae are more than two
times as high. There seem to be no significant
differences in the morphology of the corbulae.
Perhaps when more material of both species becomes
available, intermediate forms might link
the two morphotypes and A. sibogae could be
prove to be conspecific with A. postdentata.
Distribution
Indonesia. Type localities: 3°27’S, 117°36’E, 59
m; 1°42.5’S, 130°47.5’E, 32 m (Indonesia).
ACKNOWLEDGEMENTS
I wish to thank Dr. Ole Tendal of the Zoological
Museum, University of Copenhagen, for his offer
to study Mortensen’s hydroids, the loan of
other hydroids, and also for his hospitality during
two pleasant stays in Copenhagen. I would also
like to thank Dr J. Watson for reading and correcting
the manuscript and for her valuable comments
that improved the quality of this report.
The loans of hydroids from the NMNH, the Museum
of Victoria, and the ZMA helped to settle
many critical details and the generosity of these
museums is highly appreciated.
P. SCHUCHERT
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