protochordate; invertebrate chordate; lancelet
Tone colorsmāmámǎmàma
Meanings
1 sense · 3 examplesnoun
protochordate; any invertebrate member of the phylum Chordata possessing a notochord but no vertebral column
In modern zoological classification, this group comprises the subphyla Cephalochordata (lancelets) and Urochordata (tunicates/sea squirts). These organisms are distinguished from vertebrates by the absence of a bony or cartilaginous spine.
Wén文
chāng昌
yú鱼
shì是
yán研
jiū究
yuán原
suǒ索
dòng动
wù物
jìn进
huà化
de的
diǎn典
xíng型
mó模
shì式
shēng生
wù物
。
The lancelet is a typical model organism for studying protochordate evolution.
Yuán原
suǒ索
dòng动
wù物
yǔ与
jǐ脊
zhuī椎
dòng动
wù物
de的
zhǔ主
yào要
qū区
bié别
zài在
yú于
méi没
yǒu有
jǐ脊
zhù柱
。
The main difference between protochordates and vertebrates is the absence of a spinal column.
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Hǎi海
qiào鞘
shǔ属
yú于
wěi尾
suǒ索
dòng动
wù物
，
yě也
shì是
yuán原
suǒ索
dòng动
wù物
de的
yī一
zhǒng种
。
Sea squirts belong to Urochordata and are also a type of protochordate.