• TONMOCON VII Announced | MBL at Woods Hole | Apr 6-8, 2018
  • Thanks for visiting! TONMO is the world's greatest online cephalopod enthusiast community, with interactive content going back to May of 2000, and a biennial conference. If you'd like to join in on the fun, become a TONMO member -- it's easy and free. You can follow us on Facebook and Twitter for more cephy goodness.


Looking for an I.D.

OB

Colossal Squid
Staff member
Moderator
Joined
Oct 19, 2003
Messages
3,086
#2
Are those single rows of suckers?
 

DWhatley

Cthulhu
Staff member
Moderator
Joined
Sep 4, 2006
Messages
19,910
Location
Gainesville, GA
#3
I am guessing a nocturnal dwarf species based upon the eyes but am stumped on species (especially if it has only one row of suckers, we don't see that often). I am also guessing adult because of the mantle indent. I have recently noticed on my O. briareus that this dent does not show until they are more than half grown but need to watch for it closely and try to record exactly when I first see it. I have gone back through photos but don't have an accurate feel for when it shows up (it may be different for different species and may not be relavent. I have no clue what causes it biologically).

Does it show any special markings, like a yellow line down the back of its mantle?
 

klaus777

Larval Mass
Registered
Joined
Feb 19, 2012
Messages
3
#4
It has two rows of suckers but no markings that I can see. Its colors are a little blotchy on the arms kind of like a really light leopard print.
 

DWhatley

Cthulhu
Staff member
Moderator
Joined
Sep 4, 2006
Messages
19,910
Location
Gainesville, GA
#5
There is one we never see that is very common and sold as "baby octopus" in the markets. If it is Octopus aegina (I think the genus has changed several times now but the species remains aegina) or the "Marbled Octopus", you should see a thin yellow (or pale) stripe donw the back of the mantle and sometimes just above the eyes. The photos in Cephalopods A World Guide look very similar and the location is right but many of the on-line photos look significantly different. The stripe, however, would be a good indicator if you see it. From some of the photos I saw (if they are IDed correctly :roll:), it it has an excellent repitoire of patterns.
 

OB

Colossal Squid
Staff member
Moderator
Joined
Oct 19, 2003
Messages
3,086
#6
Ah, they're alternating, I see now :)
 

DWhatley

Cthulhu
Staff member
Moderator
Joined
Sep 4, 2006
Messages
19,910
Location
Gainesville, GA
#7
OB, I could not (and still can't :grin:) tell. One arm might be showing two rows but the second row could be from another arm. There are not many with single rows though (at least not from where we would see them) so I spent a lot of time looking and only came up with one possibility in a cooking article that pointed to a macropus that is "inferior" to the aegina :roll:. I could not find such a macropus in any of the more scientific offerings though :wink:

The eyes are what make me think the aegina is a possibility. The additional info about a splotchy pattern would also fit the "marbled" common name but the stripe is the only diagnostic I could find.
 

klaus777

Larval Mass
Registered
Joined
Feb 19, 2012
Messages
3
#8
Yes the two rows of suckers are alternating. it's size now is about three inches from arm tip to tip. I haven't seen a stripe yet but it's difficult to get good views without making it mad, then it just goes a deep brown/red.
 

OB

Colossal Squid
Staff member
Moderator
Joined
Oct 19, 2003
Messages
3,086
#9
O. aegina would sometimes show distinct thin brown lines on the arms. In the wild it's been known to mimic a flounder, like its more well known cousin Thaumoctopus mimicus. It is also a muck dweller, FYI, when contemplating substrate, should the ID turn out to be correct.

 

DWhatley

Cthulhu
Staff member
Moderator
Joined
Sep 4, 2006
Messages
19,910
Location
Gainesville, GA
#10
With it being so small, I am backing off that guess and going more toward one of the first animals I looked up. I am not thinking O. bocki looks more realisitic if I am right about it being an adult. The brown red color would makd more sense but the arms seem too long in proportion to the mantle (I am estimating a 4:1 arm:mantle relationship from the photo).

I am wondering why we don't see aegina though as it is common and nicely sized for the hobby.
 

OB

Colossal Squid
Staff member
Moderator
Joined
Oct 19, 2003
Messages
3,086
#11
O. aegina possesses webbing, this species apparently does not, to the same extent, at least.
 

DWhatley

Cthulhu
Staff member
Moderator
Joined
Sep 4, 2006
Messages
19,910
Location
Gainesville, GA
#12
I noticed the webbing difference but most species can/do hide it. The pictures in Norman don't show expose it like the ones on the web. I am pretty sure it is not O. aegina at this point though.
 

Members online

No members online now.