Paleonet: two parts of holotype?

Thu Feb 7 14:27:36 GMT 2008

Dear colleagues,

Some time ago there was a discussion on the list on how to treat type 
material that consists of more than one specimen, but if I recall 
correctly, there was no consense. I now have a case which I hope has a 
single answer, but I would appreciate your input here. 

 A) Finlay (1930) figured a left and a right valve of a (recent) Philobrya 
(bivalve) and called both holotype (figs 22, 23) and a another specimen 
paratype (fig. 24). I have not seen the types but from the figures it very 
much looks as if 22 and 23 belong to the same specimen. Although this is 
not mentioned in the text, it appears the only feasable explanation why 
Finlay should have called them both holotype. 

 B) To complicate things a bit, later authors figured only the left valve 
which is broken posteriorly (while the RV, at least on the the original 
photo, is complete). However, the figure caption mentions it as "holotype", 
there is no discussion of its type status (e.g. lectoholotype).

 Provided, LV and RV belong together, I would treat them both as holotype 
as Finlay did. If incorrect, I suppose the subsequent publication is not a 
nomenclatorial act that would be binding, or is it?

 Thanks and cheers,

 Niko 

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 ********** 
Nikolaus Malchus 

Institut Català de Paleontologia, Fund. Privada  
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***** 
abstracts, field guides and posters of the 
International Congress on Bivalvia, Bellaterra, July 2006 
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