epistaxi silurian myxosporidian psilophytale silurian period
gills that are attached to the stem a gray-brown back a brownish back, with blackish streaks a plant-like structure with gills dark grey-brown body
the presence of fossils or other artifacts spiny ridges along its back a crest of spines along its back and head spines or ridges on the exoskeleton black, grey, or brown coat with long, thin bristles
a fossil with a black background
the presence of fossils or other artifacts fossilized spiny ridges along its back a crest of spines along its back and head spines or ridges on the exoskeleton
trilobite which has segmented body trilobite which has short, jointed legs trilobite which has two-lobed tail trilobite which has long antennae trilobite which has shell-like exoskeleton
trilobite which has segmented body trilobite which has short, jointed legs trilobite which has two-lobed tail trilobite which has long antennae trilobite which has shell-like exoskeleton
trilobite fossil mustelinae bolboschoenus ankistrodesmus
trilobite fossil chiton individual crescentroll
trilobite which has segmented body trilobite which has shell-like exoskeleton trilobite which has two-lobed tail trilobite which has short, jointed legs trilobite which has long antennae
trilobite which has long antennae trilobite which has two-lobed tail trilobite which has compound eyes trilobite which has segmented body trilobite which has shell-like exoskeleton