dc:description"Figure 13. Hydrothecal arrangement and gonothecae of three new species. A, B, Zygophylax lighti sp. nov.; C, D, Z. pseudosibogae sp. nov.; E, F, Z. tankahkeei sp. nov. A, C, E, hydrothecal arrangement, the bases of hydrothecal pedicels are unilateral arranged, and the distal hydrothecal ends alternately turn left and right, respectively; B, D, F, gonothecae (with defensive tubes). Scale bars: A–F = 500 µm.";
dc:description"Figure 14. Morphological comparisons of selected zygophylacids with curved hydrothecae. A, Zygophylax lighti sp. nov.; B, Z. tankahkeei sp. nov.; C, Z. pseudosibogae sp. nov.; D, E, Z. sibogae Billard, 1918; F, Z. unilateralis Totton, 1930; G, Z. convallaria (Allman, 1877); H, Z. infundibulum Millard, 1958; I, Z. concinna (Ritchie, 1911); J, Z. reflexa (Fraser, 1948); K, Z. adhaerens (Fraser, 1938), hydrothecal basal portion is adherent on the hydrocladium; L, Z. tizardensis Kirkpatrick, 1890; M, Z. kakaiba Campos, Marques, Puce & Pérez, 2016; N, Z. curvitheca Stechow, 1913; O, Cryptolaria prima Busk, 1858, the hydrotheca is almost completely immersed in the hydrocladium. A, XMUB7904, holotype; B, XMUB6200-1, holotype; C, ZSM 20220300, holotype; N, ZSM 20043572, paralectotype. The following images were redrawn from the related original descriptions: D, Schuchert (2003); E, Billard (1918); F, Totton (1930); G, Allman (1877); H, Millard (1958); I, Ritchie (1911); J, Fraser (1948); K, Fraser (1938); L, Kirkpatrick (1890), Hirohito (1995); M, Campos et al. (2016); O, Busk (1858), Ralph (1958). All arrows indicate hydrothecal indentations. Scale bars: A–D, F–I, L–O = 500 µm; E, J, K, unknown.";
dc:description"Figure 19. Type material of Zygophylax tankahkeei sp. nov. A, two colonies, holotype (left), paratype (right); B, portion of the polysiphonic hydrocaulus and a monosiphonic hydrocladium, and an axillary hydrotheca (arrow); C, arrangement of the hydrothecae in two different planes; D, a hydrotheca; E, magnification of a node (upper arrow) and apophysis (lower arrow); F–J, hydrothecal diaphragms (lower arrow in F, arrows in G, H), perisarc projection (upper arrow in F, and arrow in I) and distal renovations (J); K, L, the same nematotheca at different magnifications (arrows); M, coppinia; N, gonothecae (arrow) with repeatedly, dichotomously branched defensive tubes; O, P, isolated gonothecae, the arrows in P indicate three apertures. From samples: A, the left colony, XMUB6200-1, holotype; the right colony, XMUB6200-2, paratype; B–P: XMUB6200-1, holotype.A–P, South China Sea. A–C, F–I, K–M, O, light microscope images; D, E, J, N, P, SEM images. Scale bars:A = 5 mm; B, F, K, N = 500 µm; C, M, O = 1 mm; D, I, P = 200 µm; E, G, H, J, L = 100 µm.";
