Animal Kingdom Question 250
Question: Fishes having swim bladder, which do not have direct communication with the exterior and where resorbent and secretory part is not sharply separated from one another are called as [MP PMT 2002]
Options:
A) Physostomes
B) Physoclists
C) Euphysoclists
D) Paraphysoclists
Show Answer
Answer:
Correct Answer: B
Solution:
Two type of air bladders are known.
In the more generalized groups of teleosts, the air bladder retains connection with the gut via a pneumatic duct, just as in ganoids and dipnoi.
Such an open air bladder is called physostomous.
In the teleost Erythrinus the air bladder has a lateral attachment to gut.
Such as closed or ductless air bladder is called physoclistous.
BETA
