taxonID	type	description	language	source
03BD879AE733FFAAD680FB62FA97EC2A.taxon	materials_examined	Material examined. NMV F 207310, holotype, malinol mounted microslide, infertile colony on the bryozoan Amathia tortuosa, coll: J. Watson, St Leonards pier, Port Phillip, 29 / 10 / 2012, depth 2 m; NMV F 207310, remainder of holotype colony preserved in 70 % ethanol. Description. Hydrorhiza a smooth tubular stolon of same diameter as stem, running along branches of the bryozoan host, giving off single delicate stems at irregular intervals. Stems to 15 mm high, straight, monosiphonic, cylindrical, with one or two basal ahydrocladiate internodes with weakly oblique to transverse nodes, distalmost node strongly oblique, following internodes alternately athecate and thecate, athecate internode with transverse proximal and strongly oblique distal node. Hydrocladia alternate, planar, basal hydrocladia opposite in some stems. Apophysis of stem cylindrical with transverse distal node. Hydrocladia with up to five hydrothecae, arising from behind frontal cauline hydrotheca, sometimes a short secondary hydrocladium bearing two or three hydrothecae given off from behind first hydrocladial hydrotheca. Hydrocladial internodes alternately athecate and thecate; thecate internode with oblique nodes, distal node sometimes reduced to a notch in perisarc, athecate internode with a single nematotheca about halfway along internode. Hydrotheca seated about halfway along thecate internode at an angle of approximately 40 ° to hydrocladial axis, jug-shaped, abcauline wall almost straight to weakly concave, slightly thickened, adcauline wall distinctly concave, floor asymmetrically curved, margin circular in anterior view, transverse to hydrothecal axis, rim slightly thickened. One or two large nematothecae on basal stem internodes and one halfway along athecate cauline internode, base of nematotheca long and slender, cup large, adcaudally foreshortened; nematothecae on hydrocladial internode, base of median inferior short and stout, cup adcaudally foreshortened, not reaching hydrothecal floor, base of paired laterals long, without pedicel, cup smaller than others, not reaching hydrothecal margin. Cnidome comprising microbasic euryteles all of same size, capsule elongate oval, 10 x 5 µm, shaft 7 µm long, spinous. Colony transparent white, perisarc thin. Remarks. It was originally considered that the species may be Plumularia campanula var. geelongensis Mulder and Trebilcock 1916, recorded by them only once from Corio Bay in Port Phillip. Careful search of the hydroid collections in Museum Victoria found no specimen of the variety geelongensis it is assumed that no specimens were ever lodged. Their figure of var. geelongensis (p. 76, pl. 11, figs 2, 2 a-c) shows a deep cup-shaped, straight-sided hydrotheca, suggesting that the specimen may have been a variant of Halopteris campanula (Busk, 1852), a species common in Victorian oceanic habitat. Ecology. The species occurs in sheltered habitat on jetty piles. Etymology. Named for the jug-shaped hydrotheca.	en	Watson, Jeanette E. (2015): A new species of Halopteris (Hydrozoa: Leptothecata) and redescription of Plumularia rotunda from Victoria, Australia. Memoirs of Museum Victoria 73: 41-46, DOI: 10.24199/j.mmv.2015.73.05, URL: https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-73-2015/pages-41-46/
03BD879AE731FFA9D686FF4FFC67EC2A.taxon	materials_examined	Material examined. NMV F 57984, microslide, Museum Victoria Trebilcock collection, labelled “ Type, Plumularia delicatula var. rotunda Bream Creek ”; NMV F 207643 microslide, malinol mounted, coll: J. Watson 15 / 04 / 2012, reef 21 m deep, 1.5 km off Barwon Heads, Victoria. Hydrocladium length athecate internode 60 – 72 length thecate internode 240 – 260 Description (from live, preserved and mounted material). Colony infertile, hydrorhiza a rugose stolon with internal flexion joints. Stems straight, monosiphonic, to 7 mm high, of same diameter throughout, basal one third to half of stems ahydrocladiate with some transverse joints and cauline nematothecae, apophyses at sites of previously shed hydrocladia. Hydrotheca maximum depth 148 – 168 maximum length 160 – 220 width of margin 92 – 120 Nematotheca length of base 30 – 50 width of cup 30 – 36 Stem internodes short, straight, expanding a little distally, nodes oblique to transverse, some a deep V-shaped joint, younger internodes without internal septa, older ones with several transverse intranodal septa. Hydrocladia alternate, planar, given off at or near distal cauline internode, apophysis short, proximal node transverse or slightly oblique, distal node a broad transverse shoulder. Hydrocladium with one or usually two hydrothecae, proximal athecate internode short, expanding distally from apophysis, with one or two deep transverse internal septa and deep indentations in perisarc, occasionally athecate internode extended distally by several secondary nodes; if two or more hydrothecae present on hydrocladium, these separated by a long athecate internode with internal septa, often bearing a median nematotheca. Hydrotheca occupying two thirds of internode, base of internode straight below hydrotheca; infrathecal hydrothecal chamber large, adcauline wall of hydrotheca entirely adnate to internode, convexly curved, abcauline wall strongly convex to rounded, a hook-shaped thickening passing down from abcauline wall to margin (lateral view), appearing as a submarginal septum in anterior view. Margin of hydrotheca facing obliquely backwards, sub-rectangular in anterior view, rim weakly lobate, in lateral view partly obscured by submarginal septum and abcauline wall. Hydranth with about 18 tentacles. Nematothecae all of same size, base conical, cup quadrangular in outline, wall slightly adcaudally foreshortened, one about halfway along and closely adpressed to stem internode, one in axil of apophysis, one median behind infrathecal chamber, base slightly wider than others; twin laterals with slender base below hydrotheca, not reaching hydrothecal margin. Cauline perisarc thick, stem pale brown at base fading to colourless or white below first hydrocladium. Remarks. This redescription of Plumularia rotunda from fresh material augments the descriptions of Mulder and Trebilcock (1911) and Bale (1919). The Trebilcock hydroid collection of Museum Victoria contains some fragmented, poorly labelled and several unlabelled microslide specimens of Plumularia delicatula var rotunda Mulder and Trebilcock, 1911 those labeled being from the central Victorian coast. The authors considered it to be a variety of P. delicatula Bale, 1882 but their figure provides little morphological information. A microslide (NMV F 57984) labelled “ Plumularia delicatula var. rotunda Mulder and Trebilcock, 1911 Type ”, is suggested a possible syntype by Stranks (1993) and I designate this microslide as lectotype of Plumularia rotunda. I also designate as paralectotypes of Plumularia rotunda Mulder and Trebilcock’s microslide NMV F 222407, labelled “ co-type ” from Bream Creek; microslide NMV F 222408 from Barwon Heads displaying two gonothecae, and microslide NMV F 222409 from Bream Creek, labelled “ abnormal growth ”. I further designate as paralectype of Plumularia rotunda a microslide (NMV F 222406) in the Bale hydroid collection of Museum Victoria, labelled in Bale’s handwriting “ Plumularia delicatula var. rotunda, Mr Mulder, 1907 Geelong ”. Based on this microslide, Bale (1919) provided a more detailed description and better figures of the variety rotunda, raising it to specific rank. Ecology. Although Mulder and Trebilcock left no traceable field notes about collection of specimens it is assumed that their specimens were from algae cast up on local ocean beaches. The underside of the common prostrate leathery red alga Peysonnelia from which the present fresh specimens were collected provides secure habitat for small cryptic hydroids.	en	Watson, Jeanette E. (2015): A new species of Halopteris (Hydrozoa: Leptothecata) and redescription of Plumularia rotunda from Victoria, Australia. Memoirs of Museum Victoria 73: 41-46, DOI: 10.24199/j.mmv.2015.73.05, URL: https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-73-2015/pages-41-46/
03BD879AE737FFAFD686F9FEFB4FEC28.taxon	description	A microslide NMV F 59050 in the Bale collection of Museum Victoria displays two infertile stems labelled “ Plumularia delicatula Bale, 1882, Griffiths Point, 1881, J. R. Y. Goldstein ”. Stranks (1993) suggested it may be a syntype of P. delicatula. I designate this microslide as lectotype of Plumularia delicatula Bale, 1882. Bale (1882, 1919) provided good descriptions of P. delicatula but because of pre-occupation of the name [now Lytocarpia delicatula (Busk, 1852)] in 1926 he renamed the species Plumularia wilsoni.	en	Watson, Jeanette E. (2015): A new species of Halopteris (Hydrozoa: Leptothecata) and redescription of Plumularia rotunda from Victoria, Australia. Memoirs of Museum Victoria 73: 41-46, DOI: 10.24199/j.mmv.2015.73.05, URL: https://museumsvictoria.com.au/collections-research/journals/memoirs-of-museum-victoria/volume-73-2015/pages-41-46/
