Fossils B/C

[DragonTownEpic]

I completely forgot I did this! Sorry for the delay.
Image:

Click to Show Answer

1. What does the scientific name of this specimen mean?
2. This specimen is generally understood to be a polyphyletic group. What's a polyphyletic group?
3. How did this specimen move around?

[thegroundsloth]

1.

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Straight horn

2.

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meaning that they have similar physical traits but do not have a common anscestor i think

3.

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jet propulsion

[DragonTownEpic]

Yes! Your turn.

[thegroundsloth]

1. Identify this fossil(including the type of suture lines)
2. does this organism exhibit sexual dimorphism, if so describe it in detail
3. why did these organisms go extinct while their relatives(now considered living fossils) did not?

[hmmm]

1. Identify this fossil(including the type of suture lines)
2. does this organism exhibit sexual dimorphism, if so describe it in detail
3. why did these organisms go extinct while their relatives(now considered living fossils) did not?

Answers (Click to Show Hidden Text)

1. Ammonitida
2. yes, males(aka microconchs) are smaller than females(aka macroconches)
3.lived in shallower water(more heavily affected by ocean acidificiation) and narrower geographic distribution than Nautilus

[thegroundsloth]

Nice! for the last one another answer i was thinking of could be ammonite juveniles are much smaller than nautilus juveniles so would have been more susceptible to ocean acidification your turn

[thegroundsloth]

Its been a week so I guess I should just post another set of questions:

1. ID
2. Are they nocternal or diunernal, how can you tell?
3. Herd behavior?, list evidence:

[Ttonyxx]

Its been a week so I guess I should just post another set of questions:

1. ID
2. Are they nocternal or diunernal, how can you tell?
3. Herd behavior?, list evidence:

Click to Show Answer

1. Coelophysis
2. Diurnal, can tell from its sclerotic rings
3. Yes, found in packs at Ghost Ranch 

[thegroundsloth]

I think I used a pic of a velociraptor tooth but they are very similar. Your turn!

[Ttonyxx]

Alright, here we go:



1) What genus does the fossil above belong to?
2) What does the name of this genus mean?
3) What part of the organism is this fossil?
4) What was the body temperature of this organism and how were researchers able to calculate that value?