MARINE BIOLOGY ACCESS CODE ONLY
10th Edition
ISBN: 9781260041569
Author: CASTRO
Publisher: MCG
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Textbook Question
Chapter 8, Problem 1CT
Hagfishes and lampreys are the only living representatives of a very ancient group. Why do you suppose there are still some of these jawless fishes around?
Expert Solution & Answer
Summary Introduction
To explain: The reason why there are still some of hagfishes and lampreys around.
Introduction: Jawless fishes are the most primitive fishes living today. They have cylindrical and elongated body like that of snakes or eels. Hagfishes and lampreys are jawless fishes. Hagfishes live in burrows, whereas lampreys are mostly found in temperate regions.
Explanation of Solution
There are still some of hagfishes and lampreys around due to the following reasons:
- Both hagfishes and lampreys are highly adopted species of the class Agnatha.
- Since both hagfishes and lampreys are living fossils, they are the most successful ones.
Some jawless fishes still survive as highly specialized forms, such as unusual predators and parasites. These specialized structures have not been outcompeted by other advanced fishes.
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MARINE BIOLOGY ACCESS CODE ONLY
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- How can we explain that fossils of Mesosaurus an extinct reptile that could not swim across open water, are found in the southern parts of both Africa and South America?arrow_forwardWhy do you think the ancestors of the extant amphibians became successful in adapting from the life on water to life on land?arrow_forwardThreespine sticklebacks that invaded freshwater lakes have lost their pelvic spines. What other adaptations might you expect to see in fish that have moved from a marine environment to a freshwater habitat?arrow_forward
- Evolutionarily, the jaws of vertebrates developed from the circular mouth of lampreys. the third and fourth gill arches of primitive jawless fishes. the operculum. the claspers. the last gill arch of primitive jawless fishes.arrow_forwardWhat is the currently favored explanation for the evolution of vertebrate jaws?arrow_forwardWhile hiking through the desert of New Mexico, the Smith family found a fish fossil. They thought it was strange to find something that belonged in the ocean in the desert. They each came up with a reason why there would be fish living in the desert. Who do you agree with and why?arrow_forward
- How can we explain that fossils of Mesosaurus, an extinct reptile that could not swim across open water, are found in the southern parts of both Africa and South America?arrow_forwardLampreys are jawless fish. Which conclusion about lamprey evolution is supported by the evidence in the diagram? A. Lampreys developed after hinged jaws formed. B. Lampreys once had hinged jaws but lost them during evolution. C. Lampreys are invertebrates and could not develop hinged jaws. D. Lampreys diverged from other vertebrates before hinged jaws evolved.arrow_forwardWhat are the key evolutionary adaptations that diving mammals use to survive at significant ocean depths?arrow_forward
- Lobe-finned fishes are important because theya. were the first vertebrates.b. were the earliest animals.c. are closely related to tetrapods.d. lack jawsarrow_forwardBony fishes are divided into which two groups? a. hagfishes and lampreysb. sharks and ray-finned fishesc. ray-finned fishes and lobe-finned fishesd. jawless fishes and cartilaginous fishesarrow_forwardA marine biologist catches a species of fish she has never seen before. Upon examination, she determines that the species has a predominantly cartilaginous skeleton and a swim bladder. If its pectoral fins are not fused with its head, to which category of fish does the specimen belong? a. Rays b. Osteichthyes c. Sharks d. Hagfisharrow_forward
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