Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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156 marked fold projecting into lumen, without refringent nodules at base of hydrotheca. Free adcauline side concave. Hydrothecae at end of branches different, these with an S-shaped curvature (in Indonesian material only, see Fig. 14B). Remarks The present sample was allocated to A. angulata due to the distinct dent in the adcauline wall of the hydrotheca and the pronounced fold at the bent of the abcauline wall. The Indonesian material matched Bale’s type material reasonably well, although its hydrothecae are somewhat larger and longer (up to 1.5 times) and both the adcauline dent and the abcauline fold are more pronounced (cf. Fig. 14A and C). The most distal hydrothecae of the Indonesian colony (Fig. 14B) deviate considerably from the shape of the more proximal ones in that they have an S-shaped curvature at the place where they become free. Such hydrothecae are not present in the type material. More material of this rare species is needed to evaluate the significance of these differences. The difference from the sample identified here as A. rectangularis (Fig. 13) appeared too pronounced to me to place them both into the same species (see above). Distribution Southern Australia, Indonesia (new record), P. SCHUCHERT Fig. 14. Acryptolaria angulata (Bale, 1914); A–B, station 7; C, type material from Australia. A. Hydrotheca in polysiphonic part, accessory tubules removed. B. Indonesian material, hydrothecae at monosiphonic tip of branch. C. Hydrotheca in polysiphonic part. – Scale: A–C = 0.2 mm. depth range 182–328 m. Type locality: Great Australian Bight, 182 m. Acryptolaria conferta (Allman, 1877) Fig. 15. Cryptolaria conferta Allman, 1877: 17, pl. 12: figs 6–10. – von Campenhausen 1896b: 308. Fig. 15. Acryptolaria conferta (Allman, 1877). Monosiphonic part of distal branch. – Scale: 0.2 mm.
HYDROIDS OF THE DANISH EXPEDITION TO THE KEI ISLANDS Acryptolaria conferta. – Totton 1930: 164, fig. 19a–b. – Ralph 1958: 315, fig. 4a–g. – Millard 1975: 169, fig. 56. – Calder 1991: 33, figs, 19–20, synonymy. – Hirohito 1995: 104, fig. 29c–d, pl. 6: fig. C. – Schuchert 2001: 61, fig. 48A–B. Acryptolaria conferta var. australis. – Totton 1930: 163, figs, 19c–e. – Ralph 1958: 315, fig. 4a–g. – Millard 1964: 9, fig. 1D, F–G. Acryptolaria conferta conferta. – Ramil & Vervoort 1992: 41, fig. 7a–b. Acryptolaria conferta minor Ramil & Vervoort, 1992: 43, fig. 8a–c, 9a–c. Acryptolaria conferta australis. – Vervoort 1966: 115, fig. 15. – Rees & Vervoort 1987: 37, fig. 6e. Material examined: Kei Islands Expedition station 7. Description Colony erect, up to 5 cm, irregularly branched, stem and main branches polysiphonic through overgrowth of the hydrothecae bearing primary tube with auxiliary tubes, polysiphonic part thinning towards distal, ends of branches monosiphonic. Nodes of primary tube indistinct or absent. Hydrothecae alternately arranged on opposite sides of primary tube. Hydrothecae tubular, smooth, adnate for about half of their length, curving outward, outer wall not kinked but evenly curved, base of hydrothecae open towards axial tube, no diaphragm, diameter of hydrotheca slightly increasing distally, diameter at opening 0.2 mm, margin slightly everted, often renovated. Gonothecae absent. Remarks Millard (1975) commented on the variability of this species and following her opinion, no subspecies or variants are recognized here. Besides nominal subspecies and variants, there are also similar species like Acryptolaria pulchella (Allman, 1888) which are difficult to separate. While it seems plausible that there are actually several species lumped into A. conferta, the trophosome of Acryptolaria offers too few characters for an objective separation of morphotypes. However, the coppinia of A. conferta from the tropical Atlantic and South Africa (see Allman 1877, Millard 1975, Calder 1991) lack modified hydrothecae, but such modified hydrothecae are 157 known to occur in Pacific specimens (Ralph 1958, Hirohito 1995). Hirohito (1995) found both types in Japan. Perhaps this indicates the presence of two species. New investigations must evaluate the significance of these differences. Acryptolaria conferta has already been recorded in Indonesian waters by von Campenhausen (1896b). Distribution Circumglobal, usually below 50 m depth. Type locality: Off Cojima, Cuba, 823 m. Lafoea dumosa (Fleming, 1820) Fig. 16. Sertularia dumosa Fleming, 1820: 84. Lafoea dumosa. – Broch, 1918: 7, fig. 1. – Cornelius 1975b: 385, fig. 4, synonymy. – Millard 1975: 185. – Rees & Vervoort 1987: 40, figs 7–8. – Ramil & Vervoort 1992: 55. – Cornelius 1995a: 261, fig. 60. – Hirohito 1995: 126, fig. 36a–c, pl. 8: fig. A. – Schuchert 2001: 67, figs 54–55. Lafoea fruticosa. – Millard 1975: 187, fig. 61A–F. Material examined: Kei Islands Expedition stations: 7. – 46. Description (Based on Indonesian material) Colonies erect, 1–2 cm high, polysiphonic, thinning to monosiphonic, component tubes parallel, each bearing hydrothecae at irregular intervals, arising from all sides of branches. Hydrothecae tubular, straight, about 0.5 mm Fig. 16. Lafoea dumosa (Fleming, 1820); station 7. Hydrotheca. – Scale: 0.2 mm.
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