a distinct median anterior process and large
ascending processes (Figure 7, Figure 9, Figure
10.1).
Opercular bones and hyoid arch. The preoperculum
is very narrow and inclined, resembling the
shape and position of the underlying hyomandibula,
but narrowing posteroventrally (Figure 6). The
operculum is quadrangular in shape and notably
smaller than the suboperculum (Figure 6, Figure
7). The suboperculum is fan-shaped with an undulated
surface and has a broad anterodorsal process.
A series of numerous branchiostegal rays is
incompletely preserved in the studied specimens,
although almost complete series, with 11 and 12
plates preserved in MPEF-PV 1731 and 3958
a distinct median anterior process and largeascending processes (Figure 7, Figure 9, Figure10.1).Opercular bones and hyoid arch. The preoperculumis very narrow and inclined, resembling theshape and position of the underlying hyomandibula,but narrowing posteroventrally (Figure 6). Theoperculum is quadrangular in shape and notablysmaller than the suboperculum (Figure 6, Figure7). The suboperculum is fan-shaped with an undulatedsurface and has a broad anterodorsal process.A series of numerous branchiostegal rays isincompletely preserved in the studied specimens,although almost complete series, with 11 and 12plates preserved in MPEF-PV 1731 and 3958
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