Macrorhynchia Kirchenpauer, 1872

Watson, Jeanette E., 2011, New species, new records and redescriptions of Thecate hydroids (Cnidaria: Hydrozoa: Leptothecata) from Southern Australia, Zootaxa 3122, pp. 1-36 : 10

Genus Macrorhynchia Kirchenpauer, 1872

Colony erect, hydrocauli branched or unbranched, polysiphonic, arising from a creeping hydrorhiza or anchoring filaments; hydrocladia pinnate, unbranched, arising alternately from apophysis on axial tube of stem and branches, hydrothecae borne only on hydrocladia, more or less sac-shaped, hydrothecal margin dentate, intrathecal septum present; cauline internodes with triangular nematothecae, each hydrotheca with a pair of lateral nematothecae and a partly adnate median nematotheca; gonothecae on unbranched phylactocarps of modified hydrocladia, single or in aggregated pseudomorphs; sporosacs fixed.