Cameroceras exhibited a broad range of sizes, and some species were fairly large by extinct cephalopod standards. One species, C. turrisoides from the Boda Limestone of Sweden, is estimated to have shell around 2 metres in length, while that of C. rowenaense was about 70 centimetres. Some books and older scientific papers treated Cameroceras as the absolute largest nautiloid-grade cephalopod, with a shell length reaching 5.7 metres or even 9.14 metres. A few more recent studies label the largest orthocone fossils as Endoceras giganteum. Moreover, the maximum length estimate is based on a highly doubtful field observation. Cameroceras and Endoceras are indistinguishable in most anatomical aspects, only differing in their shell texture.
