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Table 2 Current knowledge of numbers of families where muscle attachment scars have been reported distributed across orders

From: High-level classification of the nautiloid cephalopods: a proposal for the revision of the Treatise Part K

Subclass Order/suborder No. of families per subclass No. of families per (sub)order No. of families where attachment pattern is known Attachment pattern (O, V, P, D) % of families per subclass where attachment pattern is known % of families per order where attachment pattern is known
Plectronoceratia Plectronoceratida 4 2 2 O 50 100
Yanheceratida 1 0 ? 0
Protactinoceratida 1 0 ? 0
Multiceratia Ellesmeroceratida 48 7 3 O 35 43
Cyrtocerinida 3 1 O 33
Bisonoceratida 11 1 O 9
Oncoceratida 17 9 O 53
Discosorida 10 3 O 30
Tarphyceratia nov. Tarphyceratida 12 10 6 V, Pl 67 60
Ascoceratida 2 2 V 100
Nautilia Nautilida 24 24 8 Pl 33 33
Orthoceratia Rioceratida 45 2 1 D 22 50
Dissidoceratida 9 1 D 11
 Dissidoceratina 7 1 D 14
 Troedssonellina 2 0 ? 0
Orthoceratida 9 4 D 44
Pseudorthoceratida 3 0 ? 0
Actinoceratida 8 1 D 13
Astroviida 8 2 D 38
 Lituitina 2 2 D 100
 Pallioceratina 6 0 ? 17
Endoceratida 6 1 D 17
  1. Numbers of families are derived from the Treatise Part K 1964 and a range of subsequent publications. The numbers are inevitably subjective and dependent on opinions regarding the validity of particular family groupings. For sources of data regarding records of muscle attachment scars, see Online Appendix 1
  2. O oncomyarian, V ventromyarian, Pl pleuromyarian, D dorsomyarian