Talk:Crustaceans

From Comparative Physiology of Vision

Comments by Mike

Looks great folks. Here are a few general comments and things you might want to address. I apologize in advance if you mentioned them already and I overlooked them. Expand more on compound eyes in general. You might want to look at the insect wiki. What are apposition and superposition compound eyes? What are the advantages and disadvantages of each? Which ones do particular crustaceans have? How are crustacean ommatidium different than flying insects?

How do crustaceans protect their eyes from the glare from water? Ever wonder when you go crabbing that their eyes turn really black when you take them out of water? What is up with that?

I don't know about you guys, but having eyes on movable stalks is pretty amazing. How about exploring this a bit more? Polarized light detection? How is their ommatidium arranged to take advantage of polarized light navigation?

I am kind of interested in the copelia (a marine copepod) that has a scanning eye. horse shoe crabs: they have simple AND compound eyes! This should be a great topic to discuss evolution concepts!!!!!

Any one had time for this yet? A schedule perhaps?--Valnat26 16:12, 16 November 2011 (PST) I am going to work on color vision today. Nov.28th

Possible questions:

1. Are crustaceans able to see in color?

2. What type of eyes do crustaceans have?

3. Name a type of crustacean with color vision.

4. Give an example of a crustacean that is a "living fossil".

5. Do crustaceans have a different form of eye when they are in their larval stage?

Anybody else, please put something up! Valnat26 20:19, 1 December 2011 (PST)

Here are a few questions I could come up with (Katie):

6. How many different primary colors are most crustaceans capable of detecting?

7. What is a unique ability of Mantis Shrimp vision that most other species do not have?

8. What are some advantages to having the ability to sense polarized light?

Here are some I thought of. Matt

9. What types of polarized light can mantis shrimp detect?

10. What are two other animals in the other wikis that have the same kind of eyes?

11. Why do some crustaceans have color vision while others have black and white?

12. What are the evolutionary advantages to having color vision?

Shasyd15 19:16, 5 December 2011 (PST) So I went through and changed the wording in some of the sentences with the help of my boyfriend (to get an outsiders opinion on clarity) I also added some images and expanded a bit on some of the topics. Feel free to change anything, or to ask me for clarification on anything I added/changed.

Hey, thought I might just post the full list of questions here since we all have access. Just copy and paste!

Questions for Comparative Physiology Wiki

Spiders and scorpions

1. What are the physiological and functional difference between the primary (anterior median) and secondary (posterior median and lateral) eyes of spiders? 2. What evidence is there that Wolf Spiders use polarized light to navigate? 3. What unique characteristics do scorpions have in terms of vision?

Flying insects

1.) In detail, describe how motion parallax plays a part in the classical behaviors associated with movement detection in flying insects.

2.)Compare and contrast the human eye with an apposition compound insect eye, including the advantages and disadvantages associated with the two types.

3.)

Crustaceans

1. Why do some crustaceans have color vision while others have black and white?

2. What is a “living fossil”? Give an example of a crustacean that is a "living fossil".

3. What is a unique ability of mantis shrimp vision that most other species do not have?

Cephalopods

1) What is P-Vision and why is it important to underwater organisms?

2) What unique connections do Cephalopods have between vision and skin?

3) What are Pinhole type and Camera type eyes?

Fish

1. (Short Answer) Describe how some fish (members of the Loricaria genus) change their iris to the shape of the Greek symbol Ω. When do they do this?

2. As measured ___________ increases, there is a significant loss of quality and clarity of light reaching fish underwater:

   a. refractive index
   b. pollution
   c. turbidity
   d. density
   e. lens

3. (Short answer) Briefly describe one way a fish might detect the polarization of light?

4. Question 4 (If you would like, replace one of our other questions) : What is the advantage to the ability of the brownnose spookfish to see down into an increasingly diffuse environment?

Birds

1. Why is it important for birds to have a transparent eyelid for blinking?

2. When talking about vision, what is another name for the cerebrum?

3. What role do the oil droplets in the cones of birds play and what are some advantages they provide?

Reptiles

1. What is the name of the "third eyelid" possessed by crocodilia and some lizards?

2. What is the purpose of the oil droplet in reptilian photoreceptors?

Amphibians

1. Q: Which is more common among the vertebrates? a. a thick, nearly spherical lens (amphibians) b. a thinner flatter lens (primates)

2. Q: How many classes of ganglion cells does the amphibian eye contain? A: Five

3. Q: What two types of photoreceptors are unique to amphibians? A: Green rods and purple-receptive porphyropsin rods that detect in the UV range

4. Q: Name one anatomical element of the amphibian eye that contributes a protective function. A: Nictitating membrane and the ability of the retractor bulbi muscle to pull the globe back into the orbit

5. What does the retina of the amphibian eye lack, and how is accommodation performed? A: Lack foveas; accommodation is performed through a forward movement of the lens by the protractor lentis muscle, which moves the lens along the optic axis of the eye toward or from the retina.

Nocturnal Mammals

1. Name three reasons why evolution of nocturnal vision is advantageous?

2. What is the advantage to Nocturnal animals in having a higher percentage of rods in the retina?

3. What is the function of the tapetum lucidum in nocturnal mammals?

Domestic Animals

Dogs:

1. What anatomical features of the dog's eye have evolved to aid them in their diurnal behavior?

2. What do dogs have in place of a fovea? How does this affect visual acuity?

Cats:

1. Give three adaptations cats exhibit that enhance their ability to see in low-light conditions.

2. What mechanism do cats use to lubricate and clear debris from their corneas?

3. How have cats adapted to hunt prey? How has this compromised their visual abilities in other respects?

Cows:

Goats/Sheep: 1. What advantages and disadvantages are confered by the rectangular shaped pupil of the Sheep and Goat?

Horses:

Rabbits:

Pigs:

House Mouse: