Celleporina is a difficult genus in the bryozoan world. It forms colonies where the zooids bud on top of each other, and often form colonies that are quite large. The genus is recognized by the characteristic appearance of the ovicells and the (most often) pair of avicularia you can find by the orifice.
During our project we have found several Celleporina species, and possibly a new species for Norway! It is called Celleporina decipiens and is quite similar to another Celleporina species called Celleporina caliciformis. So it is perhaps not so strange that the species has remained "hidden" until now.
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Fortunately, there are differences between the two species, and the most noticeable one is that the peristome/structure around the orifice (zooid opening) has a concave edge in Celleporina caliciformis which makes it relatively easy to see the orifice itself (Fig. 2), while in Celleporina decipiens the opening is more difficult to see because of a structure called a "mucro", which in fig. 3 you can see as a little "peak" in between the paired avicularia.
