-
resemblance to
members of Gempylidae, but has
protrusible premaxillae,
serrated opercles and preopercles, and a spur on the
lowest prin****l
caudal ray, all of...
- are venomous; they have two
large venomous spines situated behind their opercles and
above their pectoral fins. The
species within the
genera Astroscopus...
- The
operculum is a
series of
bones found in bony fish and
chimaeras that
serves as a
facial support structure and a
protective covering for the gills;...
- Pomoxis, Gr****: poma, 'lid, cover' and oxys, 'sharp',
alluding to the
opercles ending in two flat
points instead of an ear flap "croppie". Merriam-Webster...
- that of the
northern pike (E. lucius).
Unlike northern pike, however, the
opercles and ch****s of
chain pickerel are
entirely scaled. It may
reach up to 78...
-
taxon to the rest of Lophiidae. It was
stated to have
large triangular opercles, a
facial support structure and
protective covering for the
gills of many...
- has
golden iridescence.
Iridescence is
particularly pronounced on the
opercles (gill covers)
which have a
violet sheen on
their posterior side. The iris...
-
spots or stripes.
There is a
black coloration of the
membrane between the
opercle and the
other head bones. A
series of
faint horizontal stripes is evident...
- is the
reduced first gill arch of a fish (on the
inner surface of the
opercle, near the
junction of the preopercle) as well as a
reduced "false" gill...
-
maxillary barbels, and
nasal barbels. No
adipose fin is present. The
opercle lacks spines. The
Nematogenyidae and
Trichomycteridae are
sister groups...
