Halecium marsupiale Bergh 1887

• Main Author: Calder, Dale R.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Cnidaria; Hydrozoa; Leptothecata; Haleciidae; Halecium; Halecium marsupiale; Kara Sea
• Online Access: https://doi.org/10.5281/zenodo.6016000; http://treatment.plazi.org/id/03A787C74906FFAAFF58FB19FD9CFA89

Halecium marsupiale Bergh, 1887 Figs. 17 e, f Halecium marsupiale Bergh, 1887: 334, pl. 28, figs. 2a, b. Type locality. Russian Federation: Kara Sea, 20 fm (37 m) (Bergh 1887: 334). Material examined. NB: Passamaquoddy Bay, off the northwestern side of Deer Island, on Hydrallmania falcata in a lobster trap, 19.vi.1985, three colonies, up to 1 cm high, without gonophores, coll. D. Calder, ROMIZ B4132. Description. Hydroid colonies erect, up to about 1 cm high, arising from a creeping, smooth to somewhat wrinkled hydrorhiza. Hydrocaulus monosiphonic, unbranched or sparingly branched, annulated at insertion with hydrorhiza, divided into internodes of varying length by distinct nodes, older hydrocauli of larger plumes straight basally, with 1-4 internodes bearing neither branches nor hydrothecal pedicels, geniculate beyond basal region, with internodes annulated basally or throughout, annulations strongest over proximal end, each internode widening at distal end in form of a Y and bearing two apophyses, with one apophysis supporting internode above and the other supporting a hydrophore or a branch, branches or hydrophores given off alternately from opposite sides of hydrocaulus. Perisarc mostly quite thin and glassy. Branches, when present, resembling distal parts of hydrocaulus. Young hydrophores with a swelling or an annulation or two above a basal node separating them from apophysis of hydrocaulus, occasionally with a deep constriction proximally, slightly wrinkled or smooth and gradually widening distally, bearing a terminal hydrotheca or primary hydrotheca; a pseudodiaphragm sometimes evident on hydrophore just below hydrotheca, with its development greater on the adcauline side; primary hydrophores commonly supporting shorter secondary or tertiary ones arising from diaphragm of hydrotheca below. All hydrothecae borne on hydrophores clearly set off from internodes of hydrocaulus, with none being sessile; hydrothecae quite deep for the genus, with a diaphragm below a ring of distinct desmocytes, hydrothecal ...