Hydroids (Cnidaria, Hydrozoa) of the Danish expedition to

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146 Family Eudendriidae Eudendrium kirkpatricki Watson, 1985 Eudendrium generale. – Kirkpatrick 1890: 607, pl. 15: figs 1–2. Eudendrium capillare. – Stechow 1925: 202. Eudendrium kirkpatricki Watson, 1985: 194, figs 35-39. – Watson 1999: 5, fig. 4A–D. – Marques et al. 2000: 98, figs 58–63. Material examined: Kei Islands Expedition station 106, infertile. – Kei Islands Expedition, Sulawesi, Ujungpandang, Samalon Island, 25 m, 29 Jun 1922, fertile female, 5-cm shoots, on Nemertesia indivisa. – Kei Islands Expedition, Moluccas, Bay of Ambon, 128 m, 25 Feb 1922, fertile female, 2-cm shoots, on organic polychaete tube. Description Colonies erect, 2–5 cm high, branched, monosiphonic, often one longer main stem with shorter side-branches, stolons creeping. Stem diameter around 0.2 mm, hydranth-cauli diameter around 0.12 mm. Hydranths relatively small (0.4 mm), 18–20 tentacles in one whorl, hypostome globular. Female sporosacs develop on nearly fully formed hydranth, one whorl of 3–8 sporosacs, spadix simple. During later development spadix reduced and the tentacles of the hydranth shortened to stumps. Eggs are ultimately attached by means of a membrane to the perisarc-covered pedicels of blastostyles. Nematocysts: microbasic euryteles abundant on tentacles, (7–8) x (2.5–3.5) µm; microbasic eurytele, few (< 8) capsules on hydranth body, oblong oval, shaft thick in undischarged and discharged capsule, shaft shorter than capsule, discharged directed sideways, size (22–25) x (11–13) µm in first two samples, (31–35) x (13.5–15) µm in third sample. Remarks Eudendrium kirkpatricki is here for the first time recorded for Indonesia. The Indonesian material agrees well with the description given by Watson (1985, 1999) except for the size of the larger microbasic euryteles, which were smaller in two samples. Unfortunately, no male colonies were seen. It is desirable to have information on the male blastostyles in order to assure a full congruence of the Indonesian population with the Australian one. The previous records along northern P. SCHUCHERT Australia, however, are rather close to the present ones, which fall within the known range of this species. There were other Eudendrium colonies in the present collection which resembled the ones described here, but had different nematocysts, either isorhizas or egg-shaped microbasic euryteles. Due the lack of gonophores, they were not assigned to a species. Distribution Tropical Australia, Red Sea, Indonesia. Type locality: Torres Strait, 09°55’S, 144°08’W. Family Cladocorynidae Cladocoryne haddoni Kirkpatrick, 1890 Fig. 7. Cladocoryne haddoni Kirkpatrick, 1890: 605, pl. 14: fig. 2. – Jäderholm 1903: 263. – Ritchie 1910b: 805. – Bouillon, Boero & Seghers 1987: 281, figs 2–4. Material examined : Kei Islands Expedition, Ambon, harbour pier, 1 m, 28 Feb Fig 7. Cladocoryne haddoni Kirkpatrick, 1890. – Scale: 0.5 mm.
HYDROIDS OF THE DANISH EXPEDITION TO THE KEI ISLANDS 1922, on Pennaria disticha and sponges, infertile. – Kei Islands Expedition, Banda Islands, Lonthoir Channel, 25 m, 11 Jun 1922, on bivalve, infertile. Description Colonies stolonal or rarely branched once, reaching heights of about 4–8 mm. Perisarc mostly smooth, thin, ending abruptly below hydranth. Hydranths spindle-shaped, with two aboral whorls of branched tentacles and one whorl of short capitate tentacles around mouth. Aboral tentacles longer than hydranth height, tapering, about 8 per whorl, the two whorls clearly separated, each tentacle with two lateral rows of short capitate side-branchlets, sometimes also a row of such branchlets on upper side of tentacle. Oral tentacles 6–8, short, adnate, with terminal capitae. On hydranth body, halfway between oral and aboral tentacles, five or more oblong pads with large macrobasic euryteles. Gonophores absent. Additional data According to Bouillon, Boero & Seghers (1987), the gonophores develop into elongated medusoids with radial canals, marginal bulbs, but without tentacles. Females with 10–20 big, yellowish eggs. Embryos develop in situ. Remarks Following Philbert (1936), many subsequent authors regarded Cladocoryne haddoni as a synonym of C. floccosa. Bouillon, Boero & Seghers (1987) re-described C. haddoni based on material from Papua New Guinea and found sufficient differences to C. floccosa to permit a reliable identification, even of immature specimens. Cladocoryne haddoni differs from C. floccosa by having only two instead of three whorls of branched tentacles, by having nematocyst pads in one ring on the hydranth body in the region between the oral and branched tentacles rather than at the bases of the oral and the branched tentacles, and finally by developing oblong gonophores distal to the branched tentacles and not more spherical ones among the tentacles. The present material of C. haddoni – although infertile – agrees well with the account of Bouillon, Boero & Seghers (1987). 147 Cladocoryne haddoni is here recorded for the first time for waters belonging politically to Indonesia; however, from a biogeographic point of view this species is already known from the region as the type locality in the Torres Strait is very close to the present findings and also the records from Papua New Guinea belong to this geographic region. Other Indonesian findings of Cladocoryne species were reported by Stechow & Müller (1923) and Vervoort (1941). Stechow & Müller (1923) identified their material as Cladocoryne pelagica Allman, 1876. Allman’s (1876) description of Cladocoryne pelagica found on Atlantic Sargassum is not precise enough to allow a reliable separation from C. floccosa. Allman’s figure shows a hydranth which apparently has only one whorl of branched tentacles, but reexamination of the type material must confirm whether this is correct. It was not possible to locate this type material. The material of Stechow & Müller (1923) originating from the Aru Islands was re-examined for this study (the specimens are kept by the “Zoologische Staatssammlung”, Munich, Germany). It is a well preserved, typical Cladocoryne species growing on the hydroid Idiellana pristis. The hydranths have one or two very closely set whorls of aboral tentacles. If two whorls are present, they are closer together as in the material from the Kei Islands. One hydranth had a small, spherical gonophore which developed distal to the aboral tentacles. Despite careful examination, I was unable to see any nematocyst pad on the hydranth body, although discharged macrobasic euryteles could regularly be found in the cauli and on the hydranths. I suspect that this hydroid is not C. haddoni and that there exist more Cladocoryne species than previously thought. Vervoort’s (1941) material identified by him as C. floccosa had 3–4 whorls of branched tentacles, each with four tentacles only. Normally both C. floccosa and C. haddoni have about eight tentacles per whorl and Vervoort’s Cladocoryne could therefore be another, so far unnamed species. Distribution Torres Strait, Papua New Guinea, Moluccas, Banda Islands, Mergui Islands, coast of India.
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