Sentence:  To a large extent the grouping is built up from partially facial characters, and I am not at all surprised to find Palamtologists offering suggestions, or making re-arrangements of the <WSD>family grouping</WSD>. The family "Cerioporidae" is particularly obnoxious, for there is not the least affinity between the "Spiropora" of Haime and the "Heteroporella" of Busk. 
Meaning of the word marked with <WSD> tags:  A taxonomic grouping at the family level.