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Old 10/11/2017, 09:34 AM   #1
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Clam ID Request

This was sold to me as a Derasa, which was one of the species that fit my tank positioning (high light, but a clam that was happy being on the sand bed with proper rock to adhere to).

After getting it home and reading more about Derasa clams it appears this may not be one, based on the ribbing on the shell. Your opinion on ID is welcome.

It is a rather dull brown/black/gold coloration on the mantle with 5 scallops. I can get top downs fully open if that would help.




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Old 10/11/2017, 10:00 AM   #2
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Here are a couple top downs just now:


Clam by Christopher Uthe, on Flickr


Clam by Christopher Uthe, on Flickr


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Old 10/11/2017, 10:10 AM   #3
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The numerous closely spaced scutes combined with the lack of incurrent siphon tentacles has me puzzled. The mantle is pushing me toward thinking I've accidentally bought a gigas but I am by no means a clam expert...


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Old 10/11/2017, 10:20 AM   #4
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Also, note that below the obvious scutes it is smooth the bottom 1/3 of the shell and appears to be fairly symmetrical.


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Old 10/13/2017, 06:30 AM   #5
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It looks like a maxima or crocea. I'm leaning towards maxima due to its mantle and acute on the side. I need to look into my books more to confirm though.

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Old 10/13/2017, 06:31 AM   #6
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*scutes not acute

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Old 10/13/2017, 02:24 PM   #7
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crocea


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Old 10/18/2017, 09:19 PM   #8
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Crocea or Maxea (crocea/maxima hybrid).


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Old 10/25/2017, 06:15 PM   #9
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crocea


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Old 10/26/2017, 05:33 PM   #10
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Thank you all for the input I sincerely appreciate it as I try to give this guy a chance at growing up.

Do Crocea / Maxima often lack incurrent siphon tentacles as juveniles? I can't find any clam species documents suggesting they don't have them which is what throws me off the most.


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Old 10/27/2017, 07:43 AM   #11
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I could be very wrong (so don't get discouraged until you hear from others or research a little more),but the Clam looks a little stressed to me. Overall, it looks great, but it looks like it might be beginning to gape a bit. Thus the lack of the filaments that you are searching for. Google image search "gaping reef clam" and you will see that the filaments are retracted due to the stretching.

Like I said, I could be wrong. But when I saw the original picture, my first thought was, "It looks like it's gaping". Just keep an eye on it and good luck!


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Old 10/27/2017, 07:48 AM   #12
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Also, can you take another photo of the Clam's profile - just a complete side shot so we can see exactly how many ribs, etc. it has? I'm not convinced yet that it's not a Derasa.


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Old 10/27/2017, 09:28 AM   #13
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I will try on the photo, but it's attached pretty well now and I'm less likely to move it. I'll see what I can do. I'll also get some more top down shots. It could have been gaping in those photos certainly, it was in the tank 48 hours at that point. I appreciate the info, I'm not trying to be argumentative on the ID by requesting reasons, just trying to grow my own knowledge as I would like to successfully keep clams and be able to identify them.


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Old 10/27/2017, 10:12 AM   #14
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Yeah, don't try to move it. And I keep flip-flopping on the ID. It's just that I have a Derasa, and it has 7 ribs with scutes, so.....I dunno? They look really similar.


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Old 10/28/2017, 11:51 AM   #15
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Quote:
Originally Posted by iced98lx View Post
I will try on the photo, but it's attached pretty well now and I'm less likely to move it. I'll see what I can do. I'll also get some more top down shots. It could have been gaping in those photos certainly, it was in the tank 48 hours at that point. I appreciate the info, I'm not trying to be argumentative on the ID by requesting reasons, just trying to grow my own knowledge as I would like to successfully keep clams and be able to identify them.
if you want to read up on clams more and understand them better, i would highly recommend these 2 books :

Giant Clams by Daniel Knop
Giant Clams in the Sea and the Aquarium by James Fatheree

they are great reads and provide a great source of information about clams. I bought my copies used from Amazon (they may actually be out of print).

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Old 11/10/2017, 12:50 PM   #16
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That's a crocea. 100% not a derasa. Almost any clam can have scutes too. In the wild a crocea is a boring clam that recesses itself into the reef rock and wears its scutes off. In a reef tank I have had 5 or 6 that had a shell identical to that.


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Old 11/13/2017, 09:48 AM   #17
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Quote:
Originally Posted by Softhammer View Post
That's a crocea. 100% not a derasa. Almost any clam can have scutes too. In the wild a crocea is a boring clam that recesses itself into the reef rock and wears its scutes off. In a reef tank I have had 5 or 6 that had a shell identical to that.
Thank you for the input and experience, much appreciated!


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