selachian

/si-ley-kee-uhn/US // sɪˈleɪ ki ən //UK // (sɪˈleɪkɪən) //

塞拉契亚,塞拉齐亚,萨拉奇,塞拉契亚人

Definitions

adj.形容词 adjective

1
- : belonging to the Selachii, a group of fishes comprising the sharks, skates, and rays.

n.名词 noun

In other words, the position of the blastopore in the Selachian is not the same as in the Frog.
The epiblast would necessarily overgrow the yolk uniformly on all sides and not in the unsymmetrical fashion of the Selachian egg.
At this stage the Amphibian kidneys are nearly in the same condition as the Selachian, in the stage represented in Fig. 2.
In Osseous fishes we probably have an embryonic condition of the Selachian kidneys retained permanently through life.
This is the chief point in which the Amphibian kidney is more differentiated than the Selachian.