FIG. 6. — A, B, D, E in New species of Hyalopomatus Marenzeller, 1878 (Annelida, Polychaeta, Serpulidae) from Recent Mediterranean deep-water coral mounds and comments on some congeners

FIG. 6. — A, B, D, E, Hyalopomatus claparedii Marenzeller, 1878; C, F, H. marenzelleri Langerhans,1884; A, B, micromorphology of outer surface consisting of a film of very small crystals forming an amorphous cryptocrystalline coat (A); locally (B) crystals are less densely packed, the inner crystals of the wall becoming partially evident (sample BIOICE 2410); C, micromorphology of the outer surface; crystals show a squat prismatic habitus, completely lacking in amorphous covering (sample BIOICE 2364); D, longitudinal section of the tube wall, arrow indicates growth direction (sample BIOICE 2364); E, transversal section of the tube wall, crystals of prismatic habitus are evident, arranged in a criss-cross homogeneous microcrystalline structure (sample BIOICE 2364); F, ultrastructure of the tube wall consisting of layers dipping towards the opening, arrow indicates growth direction. Scale bars: A, B, 5 μm; C, 40 μm; D, E, 10 μm; F, 20 μm.