On the shape of foregut lumen in sea spiders (Arthropoda: Pycnogonida)
On the shape of foregut lumen in sea spiders (Arthropoda: Pycnogonida)
复制标题
海蜘蛛前肠管腔的形状（节肢动物：Pycnogonida）
DOI：
10.1017/s0025315402006628
复制
发表时间：
2002
影响因子：
1.2
通讯作者：
K. Miyazaki
中科院分区：
文献类型：
--
作者：
K. Miyazaki
本文报道了16种海鞘的咽部和食管部前肠腔的形态。每个物种都有一个Y形的前肠腔的横截面。该结果表明，之前的一些作者将管腔错误定向为倒Y形。三辐Y形前肠腔已在包括缓步动物、有爪动物和分散的节肢动物的蜕皮动物中发现。目前，尚不清楚密殖类的Y形特征与缓步类和有爪类的Y形特征是趋同还是同形。
The shape of foregut lumen in both the pharyngeal and the oesophageal regions has been examined from serial histological sections in 16 species of pycnogonids covering all extant families. Each species has a Y-shaped foregut lumen in transverse section. This result shows that some previous authors misoriented the lumen as inverted Y-shaped. The triradiate Y-shaped foregut lumen has been found among ecdysozoans including tardigrades, onychophorans and scatteringly arthropods. At present, it is not clear whether the Y-shaped state of the characteristic in pycnogonids is convergent or symplesiomorphy with that in tardigrades and onychophorans.