Deep-water habitats below 50 m, inhabiting dimly lit environments where
a distinct deep-water cichlid assemblage occurs.
Geographic distribution:
Known only from Lukoma Bay, Tanzania, where all three specimens were collected
in a single trawl.
Typical adult size:
Deep-water Placidochromis species are generally small, with most remaining under
10 cm standard length.
Special notes:
Placidochromis longus belongs to group 1 of the deep-living
Placidochromis assemblage, which includes very elongate species. It is distinguished from
P. elongatus by having a shorter snout and nine vertical bars below the dorsal fin
(compared to 6–7 in P. elongatus). The deep-water Placidochromis form a distinct
assemblage characterized by vertical melanin bars and considerable morphological
variation.
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