TENTACULARIID TRYPANORHYNCHS FROM THE NHM 



153 



describes in more detail the high morphological variability in hook 

 patterns within the genera Nybelinia and Heteronybelinia. Although 

 the armature types help in distinguishing between the different 

 species within the group, the same hook forms and patterns are 

 found within Nybelinia, Heteronybelinia and Mixonybelinia spe- 

 cies. Beveridge etal. (1999) suggested that the transition in armature 

 types from homeoacanthous to heteroacanthous has occurred once 

 and the transition from heteroacanthous to poeciloacanthous types 

 has occurred several times within trypanorhynch evolution. How- 

 ever, it has to be considered that the development of heteromorphous 

 from homeomorphous hook patterns might also have occurred 

 several times within different species, as proposed by Palm (1995). 

 Methods other than morphology will be essential to clarify the 

 phylogenetic situation within the Tentaculariidae 



Acknowledgements. I wish to thank Drs. D. Gibson and R. Bray for the 

 possibility to study the trypanorhynchs in their collection, and E. Harris for 

 making material available after my return to Kiel. My thank belongs to Dr. I. 

 Beveridge for his kind advice in writing this manuscript. Financial support 

 was provided by the Institut fur Meereskunde Kiel and The Natural History 

 Museum, London. 



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