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无楯目的一科软体动物 来自维基百科，自由的百科全书
海鹿科（學名：Aplysiidae）是海鹿總科（學名：Aplysioidea，又名海兔超科）之下唯一的一個科。與其牠海蛞蝓相比，海鹿的體型相比較大。牠們的頭小[1]，有著又長又圓的身體，還有長長的一對檢嗅器。這些物種都是一些沒有螺殻的「海螺」，一般「海鹿」會用來叫體型相對大很多的物種，而體型較小的會叫作「海兔」，但也有文獻不論大小都稱呼為「海兔」。在這些物種當中，以加州黑海兔（Aplysia vaccaria）的體型最大，也是所有腹足綱物種中體型最大的一種，經常在內容農場的「海怪」文章提及。
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Aplysiidae
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| Aplysia californica, a typical sea hare, shown here releasing a cloud of purple pigment, probably as a reaction to being disturbed. | |
科學分類 
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| 界： | 動物界 Animalia |
| 門： | 軟體動物門 Mollusca |
| 綱： | 腹足綱 Gastropoda |
| 目： | 海鹿目 Aplysiida |
| 總科： | 海鹿總科 Aplysioidea |
| 科： | 海鹿科 Aplysiidae Lamarck, 1809 |
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Members of the Aplysiidae have an atrophied inner shell (in contrast with the nudibranchs, which have no shell at all). In Aplysia and Syphonota, this shell is a soft flattened plate over the visceral rear end, where it is fully or partially enclosed in the mantle skin. In Dolabella auricularia, the shell is ear-shaped. The shell is only present in the larval stage of the two genera Bursatella and Stylocheilus, and on this basis they have been grouped into the subfamily Dolabriferinae.[2]
They are rather large animals. Their length can reach up to 75 cm (Aplysia vaccaria), and they can weigh well over 2 kg. They are cosmopolitan and found in temperate and tropical seas, inhabiting shallow coastal areas and sheltered bays, thick with vegetation.
The Aplysiidae are herbivorous, eating a variety of red, green or brown algae and eelgrass. Their color is diet-derived from the pigments of the algae. They concentrate the toxins found on algae.
Some species spout ink when disturbed or attacked, and they may also swim (rather than crawl) away, using their broad wing-like flaps or parapodia. The ink is extracted from their algal food, rather than being synthesized.[3]
Sea hares have two main secretory glands in their mantle cavity.
The genus Aplysia has proved useful as a model in neurobiology for the study of electrical synapses, which mediate the release of the clouds of ink.[4]
Sea hares are hermaphrodites, with fully functional male and female reproductive organs. The penis is on the right side of the head while the vagina is situated in the mantle cavity, beneath the shell, deep down between the parapodia. It is therefore physically impossible for mating partners to act as both male and female at the same time.
They have unusual mating habits: they can mate in pairs with one acting as a male, the other as a female, but they commonly occur in quite crowded numbers during the mating season, and this often leads to chains of three or more sea hares mating together. The one at the front acts as a female and the one at the back as a male. The animal(s) in between are acting as both males and females, in other words, the animal receiving sperm passes its own sperm to a third sea hare.
2004年的一份研究文獻[5]顯示海鹿科是一個單系群，由兩個支序組成：
The authority of this family is still somewhat in dispute. The family was incorrectly originally spelled as Laplysiana. This was a Latinized form of the original common name "les Laplysiens" as described in Philosophie zoologique, 1:320 by Lamarck in 1809.[6] Rafinesque introduced the new name Laplysinia in 1815. In 2001 Bouchet & Rocroi advocated the attribution of the name Aplysiidae to Lamarck.[7]
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