Knowledge of squid（A）

The suborder Myopsina and the suborder Oegopsina are divided under the Organs (or Squid) Teuthida.

How do you tell the difference between the two types of squid?

First, the biggest difference is obviously the "open" and "closed" eyes. Altogether open and close, it is to point to the orbit to have to cover cornea actually. To have is to close one's eyes; to have nothing is to open one's eyes.

Eye-closing cephalopods have corneas, much like our corneas, that protect the eye and refract light. As a result, close eyes in the near sea floor have corneas, while open eyes in the deep sea do not need them.

Squid eyes and cephalopod eyes

Second, most octomates had longer fins, which usually exceeded 1/2 of LM. However, most ophthalmians were less than 1/3 of length, with a few exceptions such as rhomboid squid. Except for the circumferferal finned squid and the rhomboid squid, the terminal fins of both species are mostly diamond-shaped. Among them, the open-eyed class is dominated by transverse rhombus, and the bottom fins are connected. In closed eyes, longitudinal rhomboid was the most important, and equator tail was convex. At first glance, the vertical diamond is also very like the past spear head, so there is a squid. In addition, the sharp teeth of the sucker were specially transformed into barbs in some open eyes, but almost none in closed eyes. In terms of the horny inner shell, open eyes are also narrower than closed eyes.

In addition, the open-eyed group usually has two fallopian tubes, while the closed-eyed group has only one.

Contrast the features of closed and open eyes

Next, according to the new classification, a general understanding of the common squid, especially the most common market squid and soft fish.

Must emphasize a point: squid exists serious "allotype" or "allotype" phenomenon! That is to say, it is not easy for ordinary people to identify the "species" level by visual inspection alone, and even morphological experts are not sure! DNA sequencing is nonsense to ordinary citizens, so we can only generalize.

New classification of eye and open eye

First, close your eyes.

Myopsida, the closed eye; There are 2 families, namely, the Squid family and the Squid family.

The approximate origin of the name of the lock list

The name of the lock pipe is mainly popular in Taiwan. The province generally calls the squid at 15 to 30 cm of equator length lock tube, medium coil or translucent (translucent sometimes also refers to sword tip tail squid); Less than 15 cm is called a tubule or small volume; 3 centimeters are less than even called rotten current. In some places the lock tube is called the gun tube, the gun tube is also small or large, more than 30 or 40 centimeters is called the cannon. The squid generally refers to the eye class, such as the Pacific pleated soft fish, Argentina slippery soft fish, etc.

In squid, the males are usually larger than the females.

Australiteuthis aldrichi