Light (A-D) and scanning electron (E-I) micrographs of Trinema galeata. (A) View of several specimens to illustrate variability in shape and size of the shell. (B, C) View of live specimens showing numerous thin filopodia, granular cytoplasm forming a central band and well-defined lines, indicating the place of joingtion of wide apertural visor with the main body. (D) View of live specimen to illustrate posteriorly placed nucleus with a single nucleolus. (E) Apertural view to show general shape and regular arrangement of shell-plates. (E) Dorsal view. (G) View of shell structure in the apertural region. (H). Close up view of aperture and denticulate apertural-plates. (I) Detail of shell surface to show large, circular and small, oval shell-plates.