60
Fig. 2 Laterophysic connection in Chaetodon . ( a ) Drawing (lateral view, rostral to right) of the
bones just behind the left orbit in C. octofasciatus . The anterior swim bladder horn (shaded) sits
deep to the medial opening in the lateral line (LL) canal in the supracliethrum (black teardrop, = site
of the laterophysic connection), and in the vicinity of several canal neuromasts within the LL
canals ( grey ovals ). ( b ) Medial view of the right supracleithrum (in same orientation as a ). Arrow
points to the posterior terminal pore of the short LL canal (lumen is shaded), which is illustrated as
a black oval in a . gb gas bladder (swim bladder), h swim bladder horn, lc site of laterophysic connection (black teardrop), le lateral extrascapular, me medial extrascapular, nm neuromast ( grey
oval ), or orbit, pt post-temporal, pte pterotic, s supracleithrum. Scale bar = 1 mm. ( c ) Schematic
representation (in transverse view) of the spatial relationships of the LL canal in the supracleithrum,
the swim bladder horn and the otolithic organs of the ear in C. ocellatus . The left LL canal is in the
supracleithrum (sc), the medial opening in the canal (light grey gap in canal wall) and the neuromast that sits on the tissue fi lling the opening, muscle tissue that sits deep to the opening, the
cylindrical swim bladder horn, and the skull containing the central nervous system (CNS) and
beneath it, the ear, with the sensory macula of the sacculus on the medial wall in the midline (see
also Fig. 7 ). “1-4” indicate distances measured to describe spatial relationships of ear and horns in
Webb et al. ( 2012 ). ( d ) Transverse view of the relationship of the body of the swim bladder, and
the bilateral swim bladder horns (in C. ocellatus ) showing that the horns are outpocketings of the
swim bladder that emerge dorsally ( arrow ) on either side of the vertebral column (v) (from Webb
et al. 2006 , 2012 , reprinted with permission of John Wiley & Sons)
butterfl yfi sh hearing capabilities and the likely importance of both the auditory and
lateral line systems in acoustic communication (Sect. 4 ). We also consider how
acoustic communication during social behaviors may enhance individual fi tness
(Sect. 5 ), and discuss the ecological implications for acoustic communication by
different butterfl yfi sh species on noisy coral reefs (Sect. 6 ).
T.C. Tricas and J.F. Webb
Fig. 2 Laterophysic connection in Chaetodon . ( a ) Drawing (lateral view, rostral to right) of the
bones just behind the left orbit in C. octofasciatus . The anterior swim bladder horn (shaded) sits
deep to the medial opening in the lateral line (LL) canal in the supracliethrum (black teardrop, = site
of the laterophysic connection), and in the vicinity of several canal neuromasts within the LL
canals ( grey ovals ). ( b ) Medial view of the right supracleithrum (in same orientation as a ). Arrow
points to the posterior terminal pore of the short LL canal (lumen is shaded), which is illustrated as
a black oval in a . gb gas bladder (swim bladder), h swim bladder horn, lc site of laterophysic connection (black teardrop), le lateral extrascapular, me medial extrascapular, nm neuromast ( grey
oval ), or orbit, pt post-temporal, pte pterotic, s supracleithrum. Scale bar = 1 mm. ( c ) Schematic
representation (in transverse view) of the spatial relationships of the LL canal in the supracleithrum,
the swim bladder horn and the otolithic organs of the ear in C. ocellatus . The left LL canal is in the
supracleithrum (sc), the medial opening in the canal (light grey gap in canal wall) and the neuromast that sits on the tissue fi lling the opening, muscle tissue that sits deep to the opening, the
cylindrical swim bladder horn, and the skull containing the central nervous system (CNS) and
beneath it, the ear, with the sensory macula of the sacculus on the medial wall in the midline (see
also Fig. 7 ). “1-4” indicate distances measured to describe spatial relationships of ear and horns in
Webb et al. ( 2012 ). ( d ) Transverse view of the relationship of the body of the swim bladder, and
the bilateral swim bladder horns (in C. ocellatus ) showing that the horns are outpocketings of the
swim bladder that emerge dorsally ( arrow ) on either side of the vertebral column (v) (from Webb
et al. 2006 , 2012 , reprinted with permission of John Wiley & Sons)
butterfl yfi sh hearing capabilities and the likely importance of both the auditory and
lateral line systems in acoustic communication (Sect. 4 ). We also consider how
acoustic communication during social behaviors may enhance individual fi tness
(Sect. 5 ), and discuss the ecological implications for acoustic communication by
different butterfl yfi sh species on noisy coral reefs (Sect. 6 ).
T.C. Tricas and J.F. Webb