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2016 February
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Picture of the day
The
jaw
of a
shortfin mako shark
.
Cartilaginous fishes
such as
sharks
and
rays
have one set of oral jaws made mainly of
cartilage
; unlike
bony fishes
, they do not have pharyngeal jaws. Generally fish jaws are
articulated
and oppose vertically, comprising an
upper
and
lower jaw
. Cartilaginous fishes grow multiple sets of ordered
teeth
, replacing them as they wear.
Photograph:
Didier Descouens
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