ad-button
Reply
 
LinkBack Thread Tools
Old 11-09-2008, 01:36 AM
  #1
Fire Worm
 
chrisANDbarb's Avatar
 
Join Date: Feb 2007
Location: De
Posts: 152
Skin: Mint
Karma: 460
chrisANDbarb is a glorious beacon of lightchrisANDbarb is a glorious beacon of lightchrisANDbarb is a glorious beacon of lightchrisANDbarb is a glorious beacon of lightchrisANDbarb is a glorious beacon of light


contributor 
3link 
gallery
Default Tridacnid clam ID made easy

To accurately ID Tridacnids you really need to look at the shell, so that's what we will be doing.

Lets start with the most available clam to us hobbyist T.Crocea

Croceas have the largest/widest byssal opening of all the clams(when compared to overall shell size)



there shell is more symmetrical (short front to back, high bottom to top). the shell can close completely and is relatively smooth, sometimes with scutes at the top edge of the shell. Max size about 6 inches.








T.Maxima

Large byssal opening, but narrower and smaller then Crocea in comparison to the over all size of the shell.(Maxima left, Crocea right)



the shell is more elongated front to back and shorter top to bottom, with pronounced scutes in tight rows all the way down to the base of the shell. Max size about 14 inches (Maxima left, Crocea right)


T. Squamosa

Narrow byssal opening that closes with age.



the shell is symmetrical with length almost the same as height. Very large, widely spaced scutes all the way down to the base. Max size about 18 inches.



T. Derasa

Narrow byssal opening that closes with age.



Smooth, symmetrical shell with 6 or 7 prominent vertical folds (this is the main distinction between Derasa and Gigas) Max size about 25 to 30 inches.


T. Gigas

Narrow byssal opening that closes with age. Smooth symmetrical shell with 4 or 5 prominent vertical folds. Largest of the Tridacnid getting over 48 inches long. sorry no photos because i don't keep them.


Lastly we will cover Hippopus Hippopus because they are available to us.

H. Hippopus

Easiest to tell apart, the shell shape is completely different. Very narrow byssal opening that's flattened and squared off.





somewhat ruff shell that may have nodules. the mantle does not hang over the edge of the shell. Max size about 20 to 25 inches.



H. Hippopus has a relative named H. Porcellanus that i doubt we will ever see in the hobby. Shell characteristics are almost identical but this is one time you need to look at the in-current syphon to tell the difference. H. Porcellanus has tentacles around the in-current syphon and H. Hippopus does not.

chrisANDbarb is offline   Reply With Quote Top
 
Click Here!
Reply

Tags
clams, tridacnid

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://www.3reef.com/forums/reef-aquarium-articles-how-tos/tridacnid-clam-id-made-easy-54343.html
Posted By For Type Date
Nano-Reef.com Forums > Clam Help ! This thread Refback 05-23-2011 06:43 PM
clam question: maxima VS crocea - Reef Central Online Community This thread Refback 02-22-2011 10:41 AM
identifying clams This thread Refback 02-03-2011 07:41 AM
1200mm Surf Tank - Page 27 - Marine Aquariums of South Africa This thread Refback 05-27-2010 05:29 AM
Reefing The Australian Way Forums • View topic - Hazey36 lil 3ft'a This thread Refback 04-28-2010 05:57 AM
first clam - Atlanta Reef Club Forums This thread Refback 02-24-2010 09:37 PM
Clam Help ! - Nano-Reef.com Forums This thread Refback 02-21-2010 08:02 PM
Reefing The Australian Way Forums • View topic - Help with clam ID. This thread Refback 02-15-2010 08:57 PM
Reefing The Australian Way Forums :: View topic - Help with clam ID. This thread Refback 02-11-2010 11:35 PM
identifying clams - MASC Forums This thread Refback 02-01-2010 11:05 AM
New Crocea - Nano-Reef.com Forums This thread Refback 07-22-2009 12:04 PM
LinomaReefs.com • View topic - OMG my clam is awesome This thread Refback 06-25-2009 09:02 PM
LinomaReefs.com • View topic - "Tridacnid Clam Id Made Easy" This thread Refback 05-12-2009 08:58 AM
LinomaReefs.com • View topic - "Tridacnid Clam Id Made Easy" This thread Refback 05-08-2009 06:26 AM
MARSHReef.com This thread Refback 04-29-2009 08:28 AM
Reef Central Online Community - clam question: maxima VS crocea This thread Refback 12-22-2008 06:58 PM

Similar Threads
Thread Thread Starter Forum Replies Last Post
Giant clams: Gems of the reef coral reefer Reef Aquarium Articles and How To's 0 11-09-2008 01:08 AM
Intro to Giant Clams amcarrig Clams 41 11-03-2008 01:19 PM
Easy Blade Possibly the best $12.95 you can spend Jason McKenzie 3reef Radar 12 05-08-2008 10:12 PM
quick easy clam QT and acclimation chrisANDbarb Clams 4 02-05-2007 03:00 PM
Metal halide made easy?????????? oceaninside New To The Hobby 5 05-23-2006 08:11 AM

Join 3reef Aquarium Forums