Fantastic Find Fridays: Feb 2016

Hey plankton hunters!  We are bringing you another round of Fantastic Finds from the Plankton Portal.  Citizen scientists continue to reel in new captures of some truly awesome plankton.  Here are just a few neat finds, ID’s, and novel taxa:

Pteropod mollusk

pteropod

Did you ever learn about marine butterflies in grade-school?  Well good, because there is no such thing as a marine butterfly.  This elegant-looking critter is a pteropod, a type of gastropod mollusk—in other words, a slug!  These mollusks are highly adapted for life in the water-column, as you can see from the butterfly-like wings, (or “parapodia” to a malacologist).  The pteropod wings are actually a highly-modified molluskan foot, i.e. the muscular and slime-secreting mass that slugs glide on.  Evolution really did these slugs a favor, as I do not think anyone could say “ewww!” to such a beautiful animal.

Calycophoran Siphonophore

caly_sipho

Now this is a fantastic image.  A close-up, finely-detailed capture of the head (nectosome) portion of a calycophoran siphonophore—so aptly referred to as a “rocket-ship sipho” here on the Plankton Portal.  The two siphon-like features propelling this colonial critter are very apparent in this image.  Maybe, in truth, siphon-ophore is a pretty apt name for this plankter as well.

Ctenophore: Thalassocalyce inconstans

thalass

Thalassocalyce inconstans is a predatory species of ctenophore, captured feeding in this frame.  The body of the ctenophore is contracted and engorged about the anteroposterior (vertical) axis, giving it the appearance of an inflated, heart-shaped balloon.  Within the fragile and transparent body, you can see the 8 condensed comb rows captured as an array of ragged segments crowning the aboral end.  Fine mesenterial canals also appear as contoured markings that line the engorged body. Ctenophores are tactile predators, meaning all predatory behavior is triggered by physical, non-visual stimulus.  Something in the water column bumped into this Thalasso and got it all riled up, providing ISIIS a great opportunity for this detailed capture of foraging behavior.  If we had a hydrophone for this deployment, I am fairly certain a satisfied lip-smacking would be recorded in a few seconds.

Copepods: Families Eucalanidae and Metridinidae. 

copepods

Copepods are abundant in these ISIIS data, and it is easy to forget what a broad diversity of these important crustaceans are classified on the site.  Here we have two broadly identifiable PP copepods for sample.  The image on the left shows a copepod belonging to the family Eucalinidae: it has a narrow, torpedo-shaped body and the anterior end of the head forms a pointed-triangle.  We think this critter might be a Rhincalanus spp.—if you look close you might be able to make out a small rostrum-like appendage extending forward and tucked down from the head, as well as what may be lateral spination at the end of each mid-body segment (prosome).  This guy’s cruising, antennas spread out and scanning the surroundings.  On the right, we have a copepod belonging to the family Metridinidae, perfectly poised for the ISIIS cam.  How do we guess this ID?  At the end of this copepods lengthy tail (urosome), look closely at the paired fin-like feature (ferka).   Along the outer edge, right before the separation of the individual ferka, can you make out a small, skirt-like protrusion?  If so, just tell your buddies: “hmm, check out that lengthy urosome and ferka segmentation; it must be a Metrinidae species,” and blamo—you are a crustacean taxonomist!

Anthomedusae: Leukartia spp.

anthomed

At first glance, you might be thinking “is this medusae sticking its tongue out at me?” Or maybe it is sporting a ten-gallon hat?  While I couldn’t blame you for such outlandish assertions (I mean, who would write such silly things?), this odd anthomedusae is readily identified to genus by the conical appendage extending from the bell (“apical process”) and causing much confusion on the Plankton Portal.  In this image we get a great view of many internal and external features of this Leukartia sp., including a crenulated (ragged) bell margin, a tall mouth (“manubrium”) in the center of the bell, and many long tentacles projected both downwards and in front of the bell.

Larvacean and mucous house

larvacean

We find a good deal of larvaceans on the site, but this capture is a real beauty.  Larvaceans are gelatinous plankton that filter-feed on detritus in the water column.  You see the critter poking its head out, like the cap on a rolled-up toothpaste tube?  That’s the larvacean, curled up in preparation to pump surrounding detritus through its elaborate mesh-like mucous house.  For a critter that takes up residency in its own secretion, this guy is pretty adorable!

Physonect Siphonophore

sipho_forage

Now this is quite the fantastic find!  Here we are looking at a large siphonophore projecting numerous tentacles across the frame.  It is all-hands-on-deck for this colonial jelly, as it is putting on a mighty foraging display for us.  The big guy is hungry—watch out, ISIIS.

There have been way too many great images to fit in this small serving of photogenic plankton.  We look forward to serving up more fantastic finds in the future.  Keep exploring, plankton hunters!

Advertisements

Fantastic Find Friday Take 3!

Hey plankton hunters!  Welcome to our 3rd round of Fantastic Find Friday here at Plankton Portal.  There have been so many awesome finds on the site and we picked 5 this week for you to check out.  If you see something really neat on the portal than tag it with #FFF so we can check it out for use on the blog.  Here we go!

Physonect Siphonophore— #Sipho #Corncob

http://talk.planktonportal.org/#/subjects/APK0000iu4

51d1bd8e3ae74008a4006d0e

This is a stunning capture of a physonect siphonophore who seems to be waving hello to ISIIS as she passes by.  Like all siphonophores, this guy here is a colonial organism comprised of many individual animals or ‘zooids.’  Each zooid is specialized and distinct, but work together so closely that they more resemble a single organism than a colony of animals.  On display here are the branching tentacles used for foraging and the swimming bells that resemble a corncob.  This one is a stunner!

Lobate Ctenophore — #Lobate

http://talk.planktonportal.org/#/subjects/APK0000l30

51d1bd903ae74008a4007882

This is a really neat capture of a lobate ctenophore (Ocyropsis maculata), showing off the feature that gives this guy his name.  In this image you can see clearly the internal structure and the striated texture of his muscular, gelatinous body.  Lobate ctenophores swim lobes forwards by beating the ciliated comb rows situated on the opposite (aboral) end.  The one depicted here would be swimming towards us and to the left.  I wonder if larvacean is on the menu?

Chaetognath — #Arrowworm

http://talk.planktonportal.org/#/subjects/APK0000hpr

51d1bd8d3ae74008a4006758

Looks like an arrow shot by some undersea archer, right?  Arrow worms, or chaetognaths, are carnivorous marine worms belonging to the Phylum Chaetognatha.  They are notoriously ferocious predators that hunt other plankton with the help of hooked ‘grasping spines’ that flank the mouth.  Chaetognaths have fins for propulsion and steering—you can see all of them really well in this capture!  While these fins superficially resemble those of a fish, they are not related evolutionary and are structurally very different.

Calycophoran Siphonophore — #Rocketship #Triangle

http://talk.planktonportal.org/#/subjects/APK0000k4m

51d1bd903ae74008a40073a5

I bet NASA would get a lot more funding if they built space shuttles that looked like this!  This beautiful capture of a siphonophore really looks to me like some sci-fi monster a (horrified) astronomer might see in a telescope!  Don’t worry though, this guy is just a couple of cm’s long and probably couldn’t hurt you if he tried.  Just like the physonect siphonophore above, this guy is a colonial organism and would therefore be more appropriately referred to as guys.  The tail, or stem, on display here contains two developmental stages of siphonophore simultaneously—both the medusa and polyp stages.  Unlike most cnidarians that alternate between these stages generationally, this guy chooses to have them coexist within the same colony.  If you look closely you can see them bickering over who is the prettiest!

Calanoid Copepod — #Copepod

http://talk.planktonportal.org/#/subjects/APK00005l6

51d1bd843ae74008a4001c98

This copepod is making a heart with his antennae! Do you think he might be in love?  There is some 13,000 species of copepod in the world and they are a crucial component of plankton communities and global ecology in general.  It has been suggested that copepods may comprise the largest animal biomass on the planet! Many species of marine life, large and small, rely on these guys as their main food source, including whales and seabirds.  Looks like this guy here is a lover not a fighter!

Looking forward to next time !