Аннотация:Abstracts to XXIV. International Ornithological Congress, Hamburg, 2006
This study of the morpho-functional features of the jaw in the Old
World suboscinine family of broadbills has been carried out on
species of all but three of the nine genera: Eurylaimus javanicus,
Cymbirhynchus macrorhynchos, Serilophus lunatus, Psarisomus
dalhousiae, Calyptomena viridis, and Smithornis capensis. Heads
and jaw muscles were first dissected, with detailed sketches made
of the skull and recording of the shape and interrelations of
aponeuroses in the jaw, followed by functional analysis of the
jaw apparatus as a whole. As has been shown, the members of the
Eurylaimidae form a natural group, with a common plan to the
structure of the jaw apparatus specially adapted for consuming
large items of food. All species have a wide bill and pharynx, and
differ from other passerines in the simple pinnate structure of
their jaw muscles, which consist of relatively long muscle fibres
capable of extensive contraction and a small number of
aponeuroses. Such structural features enable the jaws to open
widely at the gape, and give broadbills the unusual capacity to
process food at the back of the mouth. Correlated with these
specializations is the structure of the tongue, which is wide,
fleshy and highly mobile. Such characteristics separate the
insectivorous Asian broadbills into two groups, one comprising
Psarisomus and the other Eurylaimus, Cymbirhynchus and
Serilophus. The green, frugivorous Calyptomena broadbills form
a discrete group, while Smithornis combines a mosaic of the
features of all three groups.