FIGURE 6. A, B in New additions to the shallow-water hydroids (Cnidaria: Hydrozoa) of the French Lesser Antilles: Martinique

FIGURE 6. A, B: Diphasia digitalis (Busk, 1852)―stem internode in frontal (left) and lateral (right) views (A); optical cross section through internode at level of hydrothecal apertures (B). C–G, J–M: Sertularella calderi sp. nov.―fragments of stem (C, D); hydrothecae (E) and aperture viewed from above (F); comparison of the hydrotheca (G) with those of S. fraseri Galea, 2010a (H) and S. peculiaris Leloup, 1974 (I); male (J) and female (K) gonothecae; apertures of male (L) and female (M) gonothecae viewed laterally (below) and apically (above). N–P: Sertularelloides cylindritheca (Allman, 1888)―internodes (N); lateral view of hydrotheca (O) with thickened internal ring of perisarc at base of apophysis (right), and frontal view of the latter (left); apical view of hydrotheca (P). Q–T: Thyroscyphus longicaulis Splettstösser, 1929―fragment of stem (Q); internode and hydrotheca (R); aperture (S); male (left) and female (right) gonothecae (T). U–Z: Hincksella formosa (Fewkes, 1881)―hydrotheca (U); gonotheca seen laterally (V), and in optical cross section (X); aperture (Y). Scale bars: 10 µm (Z), 200 µm (F, L, M), 300 µm (P), 500 µm (A, B, E, G–I, O, S, U, Y), 1 mm (C, D, J, K, N, R, T, V, X), 4 mm (Q).