Fig.3. Rhabdopleura compacta Hincks,1888 in Cortical fibrils and secondary deposits in periderm of the hemichordate Rhabdopleura (Graptolithoidea)

Fig.3. Rhabdopleura compacta Hincks,1888,Recent(ZPALPb.5/1).Surface micromorphology of prosicula. SEM micrographs. A. Distal part of prosicula connected with proximal part of metasicula. B. Outer surface of prosicula near boundary with metasicula. C. Arrangement of prosicular large pits. D–E. Details of foreiign material covering the outer surface of prosicula.F.Arragementofprosiculatinypitsonlargepitbottoms. G.Details of tiny pits. Abbreviations: c, creeping tube; e, erect tube; fm, foreign material; lp, prosicular large pit; m, metasicula; p, prosicula; r, rim of tiny pit; tp, prosicular tiny pit.