Octopus bimaculoides holotype

Tintenfisch

Architeuthis
Staff member
Moderator
#1
Hi guys,

One of the type specimens I came across while visiting the Smithsonian was the holotype of Octopus bimaculoides. Although not as lively as many of the other pics we get here (though the last shot captured a stealthy escape-from-the-jar attempt), I thought some of you keepers (and others) might be interested in seeing these. :smile:
 

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DWhatley

Cthulhu
Staff member
Moderator
#2
Kat,
What would make the suckers become square? I have not seen this using formalin followed by alcohol and it is quite pronounced in your terrific photos. I just notice the 1949 dating so perhaps it is the aging in alcohol?
 

Tintenfisch

Architeuthis
Staff member
Moderator
#3
Maybe something to do with being live-fixed - I guess the suckers might squinch up (like the eyes)? If so, that would explain why you don't see this effect on your octos, since I doubt you fix them live... :cry:
 

Steve O'Shea

Colossal Squid
Supporter
#5
Tintenfisch;139350 said:
Maybe something to do with being live-fixed - I guess the suckers might squinch up (like the eyes)? If so, that would explain why you don't see this effect on your octos, since I doubt you fix them live... :cry:

You hit the nail on the head there Kat! Fixation artefact. Nice to see the holotype.
 

Cryp_Sis

O. bimaculoides
Supporter
#6
Great pictures Kat! They got me thinking though. As we have talked about, DNA analysis currently isn’t very helpful in identifying type, and my impression is that the body patterns, colour, texture and posture exhibited, can be useful in distinguishing specimens of a similar size and unknown age. I am guessing (based on some of the other holotype specimens you have come across!) that there is not a lot of additional documentation about the colour patterns and posture seen in the live specimen prior to fixation… Although perhaps this is not really an issue when collecting type specimens, as one always has the geographical location to help distinguish between species? Just thinking out loud, really. In any event, I guess that wouldn’t do you much good for your Arctic projects, since many of the specimens come in mortally challenged.
Thanks for posting. It’s good to see the original.
Cheers,
Lene.
 

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