THE STRUCTURE AND MODE OF LIFE OF THE PYRAMIDELLIDAE, PARASITIC OPISTHOBRANCHS
THE STRUCTURE AND MODE OF LIFE OF THE PYRAMIDELLIDAE, PARASITIC OPISTHOBRANCHS
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DOI：
10.1017/s0025315400023377
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发表时间：
1949-01-01
影响因子：
1.2
通讯作者：
GRAHAM, A
中科院分区：
文献类型：
--
作者：
FRETTER, V;GRAHAM, A
金龟科(Pramidellidae)类似结构和生活方式的腹足软体动物，每一种都是靠吸食特定宿主的血液生活的体外寄生虫。嘴巴放在可伸缩的长鼻子顶端的吸盘上。口腔包含一个中空的口针[长冲刺]，改良的颌骨[长冲刺]环绕着正中的唾液管，在其内端形成一个肌肉泵。没有防护罩。甲锥虫与后中柱的一致之处在于：胃是消化腺的导管排入的空间，肠道较短；神经系统集中且中性；性腺两性，连接两性导管的大腺体为卵块提供外层保护；开放的精子沟从共同生殖器孔通向可内陷的阴茎，精子囊附着在阴茎鞘上并在每次交配前充满；角质层有左侧壳。阴茎穿过神经环腹侧到达食道，这个位置可能与内向者的发育有关。
The family Pyramidellidae contains spp. of gastropod mollusks of similar structure and mode of life, each an ectoparasite living by sucking the blood of a particular host. The mouth lies on a sucker at the apex of a long retractible proboscis. The buccal cavity contains a hollow stylet[long dash]the modified jaw[long dash]surrounding the median salivary duct, and at its inner end forms a muscular pump. No radula is present. The pyra-midellids agree with the opisthobranchs in that the stomach is a space into which the ducts of the digestive gland discharge, and the intestine is short; the nervous system is concentrated and euthyneurous; the gonad is hermaphroditic and large glands attached to the hermaphroditic duct provide the outer protective covering of the egg mass; an open seminal groove leads from the common genital aperture to an invaginable penis, and a sperm sac is attached to the penial sheath and filled before each copulation; the veliger has a sinistral shell. The penis passes through the nerve ring ventral to the esophagus[long dash]a position perhaps associated with the development of the introvert.