Chapter 8 Pelagic Mollusca "brighter than glass, and yet, as glass is, brittle" Department of Oceanography
Chapter 8 Pelagic Mollusca "brighter than glass, and yet, as glass is, brittle" Department of Oceanography
References Lalli, C.M. & Gilmer, R.W. (1989) Pelagic Snails. The biology of holoplanktonic gastropod molluscs. Stanford University Press: Stanford, California. 张福绥, 1964. 中国近海的浮游软体动物 I. 翼 足类、异足类及海蜗牛类的分类研究. 海洋科 学集刊, 5: 125 - 226
References Lalli, C.M. & Gilmer, R.W. (1989) Pelagic Snails. The biology of holoplanktonic gastropod molluscs. Stanford University Press: Stanford, California. 张福绥, 1964. 中国近海的浮游软体动物 I. 翼 足类、异足类及海蜗牛类的分类研究. 海洋科 学集刊, 5: 125 - 226
Introduction In the molluscan phylum the holoplanktonic species do not form a group on their own, but representatives of various taxonomic groups independently developed a holoplanktonic way of life. The most important among them are the so-called 'Pteropoda', an obsolete, but quite practical name for what is officially indicated as Mollusca, Thecosomata. Also the many species of the Heteropoda are holoplanktonic. Finally, a restricted number of species within the large group of the Nudibranchia have the same way of life
Introduction In the molluscan phylum the holoplanktonic species do not form a group on their own, but representatives of various taxonomic groups independently developed a holoplanktonic way of life. The most important among them are the so-called 'Pteropoda', an obsolete, but quite practical name for what is officially indicated as Mollusca, Thecosomata. Also the many species of the Heteropoda are holoplanktonic. Finally, a restricted number of species within the large group of the Nudibranchia have the same way of life
Gastropoda（腹足纲） Opisthobranchia（后鳃亚纲） Pteropoda（翼足目） Gastropeteridae（腹翼螺 科） Phyllirrhoidae（波叶海牛科） Glaudidae（海 神鳃科） Prosobranchia（前鳃亚纲） Heteropoda（异足亚目）Janthiniidae（海蜗牛科）
Gastropoda（腹足纲） Opisthobranchia（后鳃亚纲） Pteropoda（翼足目） Gastropeteridae（腹翼螺 科） Phyllirrhoidae（波叶海牛科） Glaudidae（海 神鳃科） Prosobranchia（前鳃亚纲） Heteropoda（异足亚目）Janthiniidae（海蜗牛科）
Pteropoda 翼足类 a pair of parapodium is modified as a swimming organ (fin) visceral mass are anisomerous the nerves are not twisted (detorsion) hermaphrodite larval stage
Pteropoda 翼足类 a pair of parapodium is modified as a swimming organ (fin) visceral mass are anisomerous the nerves are not twisted (detorsion) hermaphrodite larval stage
口 前触角 前触角神经 口锥 三叶日块 头巾 后触角 口锥神经表皮神经 视神经脑 5唾液腺 食道 消化腺 肠 幅膜 两性膝
Classification with shell, head indistinct, one pair tentacles . Suborder Thecosomata被壳亚目 with one left-handed spiral or straight calcified shell . Euthecosomata真壳部 left handed spiral shell.Limacinidae 虎螺科 straight or some what backward bending shell .Cavoliniidae龟螺科 typical form with one cartilaginous inner shell . Pseudothecosomata假壳部 without shell, head distinct, two pairs tentacles .Suborder Gymnosomata裸体亚目
Classification with shell, head indistinct, one pair tentacles . Suborder Thecosomata被壳亚目 with one left-handed spiral or straight calcified shell . Euthecosomata真壳部 left handed spiral shell.Limacinidae 虎螺科 straight or some what backward bending shell .Cavoliniidae龟螺科 typical form with one cartilaginous inner shell . Pseudothecosomata假壳部 without shell, head distinct, two pairs tentacles .Suborder Gymnosomata裸体亚目
Limacinidae 螺科 small, thin, fragile lefthanded spiral shell mantle cavity on dorsal side single lobed fin Limacina Limacina helicina
Limacinidae 螺科 small, thin, fragile lefthanded spiral shell mantle cavity on dorsal side single lobed fin Limacina Limacina helicina
Cavoliniidae龟螺科 Shells are straight or slightly curved. transverse section circular smooth shell surface.Creseis笔帽螺属 transverse section flat aperture oval, shell with ring-like constriction .Hyalocylix玻杯螺属 aperture constricted elongated aperture without thickenned margin, small posterior foot lobe. Cavolinia龟螺属
Cavoliniidae龟螺科 Shells are straight or slightly curved. transverse section circular smooth shell surface.Creseis笔帽螺属 transverse section flat aperture oval, shell with ring-like constriction .Hyalocylix玻杯螺属 aperture constricted elongated aperture without thickenned margin, small posterior foot lobe. Cavolinia龟螺属
Creseis 笔帽螺属 Creseis has a needleshaped, lightly calcified external shell, and a pair of wing-like flaps which are used in swimming. It feeds by trapping other plankton in a transparent muccous wen which it suspends above it in the water. Creseis acicula Creseis virgula conica
Creseis 笔帽螺属 Creseis has a needleshaped, lightly calcified external shell, and a pair of wing-like flaps which are used in swimming. It feeds by trapping other plankton in a transparent muccous wen which it suspends above it in the water. Creseis acicula Creseis virgula conica