I think you’ve got it! Can’t show it but I’ve looked at it under a stereoscope and it’s almost 1:1 with a tanaid. Only difference is some images I’m seeing have different claw size/lengths, but I’m sure that can be narrowed down to different region, different age, and different species of Tanaid
Unsure. Was found in a fish tank, after some new organisms were brought in. The tank is brackish, and I know the organisms are from North America, but thats where my knowledge of location ends. Likely near one of the eastern or western shoreboards where ocean meets rivers, but that’s still a LOT of possible areas as far as I’m aware
If those elongated structures are antennae I believe they are isopods of the family Arcturidae. The overall body morphology should discard Caprellidae, they are usually more cylindrical with two conspicuous pairs of gnathopods, followed by reduced pereopods in the middle segments of the body and longer pereopods in the posterior region.
Corophids usually have bigger 2nd antennae but the pereon lacks the usual coxae morphology seen in amphipods, the shape of the pereopods and the telson also does not resemble Corophiidae.
The lack of conspicuous chelae should discard Tanaidae, they should be easily seen even in juveniles or females. Also I think the telson is significantly longer than other body segments in your photos? I can't see it too well but if so I think they could be an arcturid isopod.
This is all assuming that those elongated structures are 2nd antennae, if they are actually chelipeds (can't see the chelae in your photos) then it should be a tanaid.
Your submission was removed because it violated rule #7: Identification posts must include geographic location in the title. Identifying organisms can be extremely difficult without a geographic location - please make it easy for everyone to know where you found them.
slimygrapefruit@reddit
Could be a tanaid. There are some estuarine species.
wafflezcoI@reddit (OP)
I think you’ve got it! Can’t show it but I’ve looked at it under a stereoscope and it’s almost 1:1 with a tanaid. Only difference is some images I’m seeing have different claw size/lengths, but I’m sure that can be narrowed down to different region, different age, and different species of Tanaid
slimygrapefruit@reddit
If you still have the individual, check out Hargeria rapax.
wafflezcoI@reddit (OP)
Damn that one’s pretty close too. I’ll have to nick another and compare them
nebula_m78@reddit
100% tanaid. Not a caprellid. Where in North America?
wafflezcoI@reddit (OP)
Unsure. Was found in a fish tank, after some new organisms were brought in. The tank is brackish, and I know the organisms are from North America, but thats where my knowledge of location ends. Likely near one of the eastern or western shoreboards where ocean meets rivers, but that’s still a LOT of possible areas as far as I’m aware
nebula_m78@reddit
Ok. I asked cuz knowing location can help narrow down to species or genus level, or close enough pictures to see their structures
wafflezcoI@reddit (OP)
Yeah I get that, mods gave me a bit out of that which is fair.
Also doesn’t help that these pictures aren’t exactly high quality. It is also the type of species better viewed under a stereoscopr
gutix10@reddit
If those elongated structures are antennae I believe they are isopods of the family Arcturidae. The overall body morphology should discard Caprellidae, they are usually more cylindrical with two conspicuous pairs of gnathopods, followed by reduced pereopods in the middle segments of the body and longer pereopods in the posterior region.
Corophids usually have bigger 2nd antennae but the pereon lacks the usual coxae morphology seen in amphipods, the shape of the pereopods and the telson also does not resemble Corophiidae.
The lack of conspicuous chelae should discard Tanaidae, they should be easily seen even in juveniles or females. Also I think the telson is significantly longer than other body segments in your photos? I can't see it too well but if so I think they could be an arcturid isopod.
This is all assuming that those elongated structures are 2nd antennae, if they are actually chelipeds (can't see the chelae in your photos) then it should be a tanaid.
wafflezcoI@reddit (OP)
The elongated structures are claws. Apologies I couldn’t get a better photo of it
marinebiology-ModTeam@reddit
Your submission was removed because it violated rule #7: Identification posts must include geographic location in the title. Identifying organisms can be extremely difficult without a geographic location - please make it easy for everyone to know where you found them.