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Fig. 2. Illustration of the Pomacanthus semicirculatus skull (left lateral
view) based on clear-stained preparations. (A) Feeding apparatus when relaxed.
(B) Suspensorium and operculum rotated, and jaws protruded. (C) Detail of
protruded-closed oral jaws. Osteology labelling: an, angular; art, articular;
d, dentary; hyom, hyomandibular; ihy, interhyal; iop, interoperculum; mpt,
metapterygoid; mx, maxilla; op, operculum; pal, palatine; pmx, premaxilla;
pop, preoperculum; ptr, ectopterygoid; q, quadrate; sop, suboperculum; supcl,
supracleitrum; sym, symplectic; urohy, urohyal; lc, lachrymal; points of
flexion are indicated in A between hyomandibular with nc, neurocranium (filled
circle) and between the palatopterygoid complex of the suspensorium with the
lateral ethmoid (open circle). Open circle in C: IMJ, intramandibular joint.
Myology labelling: A1 (10% grey); A2 (50% grey, and medial to A1 and A3); A3
(30% grey), adductor mandibulae segments. LOP: levator operculi, DOP: dilator
operculi, LAP: levator arcus palatini, AAP: adductor arcus palatini. Ligament
labelling (all in 75% grey): EF, naso–premaxilla elastic fibres; DLPM,
dorsal premaxilla–maxilla ligament; LIM, interopercular–mandibular
ligament; LIS, interopercular–subopercular ligament; ILPM, inner
premaxilla–maxillary ligament; LPM, palatine–maxillary ligament;
LRDM, articular–dentary–maxillary ligament; VLPM, ventral
premaxilla–maxilla ligament. Scale bars, 10 mm.
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