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A horny pad on the underside of the basioccipital bone of the skull is used to masticate the food against.
Collares-Pereira (1994) argues that the polyploid condition (e.g. There are 2-4 unbranched rays (including rudimentary ones) in the dorsal and anal fins followed by the more numerous branched rays (the last two branched rays are counted as one).
The first pectoral and the first pelvic fin ray are unbranched and not included in counts.
Pharyngeal teeth lie on a modified, fifth gill arch which can be seen or probed behind the shoulder girdle, just inside the gill opening.
The arch has to be removed with dissecting equipment to count the teeth.
The family is found in North America, Eurasia and Africa.
Tooth counts are presented as a formula such as 2,5-4,1 which indicates 2 teeth in the outer left row and 4 on the inner right row.Teeth may be lost from major or minor rows so variant formulae are given after the principal one.