Catanema schiemeri

Catanema schiemeri View in CoL and C. sp.

The isthmus is slender in both species and tapers the most in C. schiemeri out of all investigated species ( Table 1). The zleri, g Cyathorobbea agricola , volume rendering h Laxus oneistus . Scalebars a–h 20 μm. c, corpus; da, dorsal ampulla; n, nucleus inside the corpus; ne, epidermal nuclei; sm, somatic muscle; va, subventral ampulla in orange, nuclei in blue, anterior isthmus k Cyathorobbea agricola, CLSM optical section, autofluorescence, autofluorescence (UV laser) of gland secretion in green, pharynx region l Cyathorobbea agricola , optical section, corpus-isthmus transition, subventral ampulla m Laxus oneistus, CLSM optical section, autofluorescence, pharynx region n Laxus oneistus, TEM micrograph, subventral ampulla, corpus. Scalebars a 10 μm, b 5 μm, c 20 μm, d 15 μm, e 15 μm, f 15 μm, g 20 μm, h 5 μm, i 5 μm, j 10 μm, k 20 μm, l 10 μm, m 20 μm, n 5 μm. bc, buccal cavity; c, corpus; cu, cuticle; da, dorsal ampulla; gd, gland duct; gso, glandular sensory organ; i, isthmus; n, nucleus; rm, radial musculature; sm, somatic muscle; sp, spiral muscle; va, subventral ampulla; vg, subventral gland labelled myofilaments of C. schiemeri are regularly arranged and displaced distinctly only at positions of the gland ampullae and gland ducts ( Figs. 1c View Fig , 4a, c and 6c, d View Fig ).