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Cnidaria: Hydrozoa: Leptothecata) from Southern Australia

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Cnidaria: Hydrozoa: Leptothecata) from Southern Australia Zootaxa 3122: 1–36 (2011) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ Article ZOOTAXA Copyright © 2011 · Magnolia Press ISSN 1175-5334 (online edition) New species, new records and redescriptions of Thecate hydroids (Cnidaria: Hydrozoa: Leptothecata) from Southern Australia JEANETTE E. WATSON Honorary Research Associate, Marine Biology Section, Museum Victoria, P.O. Box 666, Melbourne, Australia, 3001. E-mail: [email protected] Table of contents Abstract . 2 Introduction . 2 Family Campanulinidae Hincks, 1868 . 2 Genus Campanulina van Beneden, 1847 . 2 Campanulina cliftonia sp. nov. 2 Campanulina elata sp. nov. 4 Family Lovenellidae Russell, 1953 . 6 Hydranthea Hincks, 1868 . 6 Hydranthea margarica (Hincks, 1862) . 6 Family Hebellidae Fraser, 1912 . 8 Hebella Allman, 1888 . 8 Hebella albida sp. nov. 8 Family Aglaopheniidae Marktanner-Turneretscher, 1890 . 11 Genus Macrorhynchia Kirchenpauer, 1872 . 11 Macrorhynchia mulderi (Bartlett, 1907) . 11 Macrorhynchia whiteleggei (Bale, 1888) comb. nov. 13 Family Halopterididae Millard, 1962 . 16 Genus Antennella Allman, 1877 . 16 Antennella singulata sp. nov. 16 Genus Monostaechas Allman, 1877 . 18 Monostaechas quadridens McCrady, 1859 . 19 Family Kirchenpaueriidae Stechow, 1921 . 22 Genus Ventromma Stechow, 1923 . 22 Ventromma bellarensis sp. nov. 22 Family Sertulariidae Lamouroux, 1812. 24 Genus Sertularella Gray, 1848 . 24 Sertularella mytila sp. nov. 24 Family Campanulariidae Johnston, 1836 . 26 Genus Obelia Péron & Lesueur, 1810 . 26 Obelia bidentata Clarke, 1875 . 26 Obelia spongicola sp. nov. 28 Genus Gonothyraea Allman, 1864 . 30 Gonothyraea loveni (Allman, 1859) . 30 Acknowledgements . 32 Literature cited . 32 Accepted by A. Collins: 17 Oct. 2011; published: 7 Dec. 2011 1 Abstract A collection of 13 species from southern Australia is described. The collection includes Campanulina cliftonia n. sp., Campanulina elata n. sp., Hebella albida n. sp., Antennella singulata n. sp., Ventromma bellarensis n. sp., Sertularella mytila n. sp., and Obelia spongicola n. sp. Hydranthea margarica is a new record of the genus from Australia; five other species previously recorded from Australia are redescribed in detail. The reproductive structure of Macrorhynchia whiteleggei is described for the first time allowing for a new genus species combination. Notes are given on distribution and ecology. Key words: new species, Campanulina cliftonia, Campanulina elata, Hebella albida, Antennella singulata, Ventromma bellarensis, Sertularella mytila, Obelia spongicola; new record, Hydranthea margarica, species redescriptions Introduction This paper describes 13 species of leptothecate hydroids collected in southern Australia by the author and others. The paper describes seven new species and one new record for Australia, and redescribes several previously poorly known or inadequately described species. Type and voucher material is lodged in Museum Victoria, Melbourne, Australia (NMV F). Other material is held in the collection of the author. Family Campanulinidae Hincks, 1868 Colony stolonal or erect, hydrocaulus branched or unbranched; hydrotheca usually campanulate or cylindrical, with or without pedicel, always with operculum of several triangular flaps; sharply demarcated from hydrotheca or not; with or without diaphragm; with or without nematophores; gonophores as fixed sporosacs or free medusae. Genus Campanulina van Beneden, 1847 Colony stolonal or erect, hydrotheca tubular, with a pointed pleated or segmented operculum with or without a basal crease line, no nematophores, usually with a diaphragm, gonophores unknown or arising as indeterminate medusa buds. Campanulina cliftonia sp. nov. Fig. 1A–E Material examined. Holotype, NMV F171352, infertile colony on dead bryozoan on floating pontoon, Clifton Springs boat harbour, Port Phillip, depth 0.3 m, coll: J. Watson, 7/04/2009. Paratype, NMV F171353, infertile col- ony on serpulid tube, on floating pontoon, Clifton Springs boat harbour, Port Phillip, depth 0.2 m, coll: J. Watson 22/02/2010. Paratype, NMV F171354, infertile colony on mussel shell, St Leonards pier, Port Phillip, depth 3 m, coll: J. Watson, 20/01/2010. All material ethanol preserved. Description from holotype and paratype (live material). Colony minute, stolonal, hydrorhiza loosely attached to substrate, stolons tubular. Hydrothecal pedicels arising irregularly from stolon, diameter about same as stolon; pedicels variable in length, weakly corrugated to almost smooth, cylindrical or expanding slightly to base of hydrotheca, perisarc thin. Hydrotheca slender bud-shaped to almost tubular, variable in length, operculum compris- ing up to 20 thin segments arising in distal half to quarter of hydrotheca and converging in a tuft; no demarcation with body of hydrotheca; perisarc of hydrotheca and opercular segments thin; hydrothecal diaphragm usually indis- tinct but concave in paratype; no nematophores. Hydranth very extensile with a whorl of 16–20 long moniliform tentacles with rings of nematocysts; tentacles extended in an amphicoronate pattern, base of tentacles connected by a conspicuous web with groups of large nem- atocysts; hypostome small, conical. Column of extended hydranth 0.5–1.0 mm long, tentacles to 0.7 mm long. 2 · Zootaxa 3122 © 2011 Magnolia Press WATSON.
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