|
__NOTOC__ The Lovenellidae are a hydrozoan family of the suborder Conica. Their hydroids live together in upright stolonal or sympodial colonies, and their gonophores are pedunculate free-roaming medusae.〔Schuchert (2005)〕 The relationships of this fairly small but distinctive radiation to other conican Leptomedusae are not well understood at present. The Haleciidae have served as a "wastebin taxon" for unidentifiable medusae; they contained several species that have been identified as gonophores of Lovenellidae, and as per standard practice have been moved to the hydroids' family. == Description == The elongated, everted-conical to bell-shaped hydrothecae are pedicellate. They have a diaphragm and a conical operculum apically to the hydrothecal wall, formed either by this wall or by separated embayments of the hydrothecal margin, with a lining of triangular plates. The tentacles of some but not all carry webbing between them. The hydrothecae wear down during the individual hydroids' life, and old ones often have just the collar-like bottom of the hydrotheca remaining.〔 The manubrium of the medusae is short. They lack a gastric peduncle, ocelli (making them effectively blind) and excretory pores, and have 4 simple radial canals and in adults at least 16 statocysts. The tentacles at their margin are hollow and at the side carry cirri; cirri are lacking from around the margin however. The gonads are located at the radial canals; they do not reach the manubrium.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lovenellidae」の詳細全文を読む スポンサード リンク
|