Hawaiian Deep Sea-Urchins!!! Below the Surface of a Tropical Paradise!

So, following up on the Hawaiian deep-sea starfish post from a few weeks ago...I thought it would be cool to show some other echinoderm diversity...and who doesn't love sea urchins???
A brief background on where these pictures came from... These were ALL taken by the Hawai'i Undersea Research Laboratory (HURL) at the University of Hawai'i at Manoa and are all species that live in deep-water in and around the Hawaiian Islands. HURL operates two manned submersibles..the Pisces V and the Pisces VI.
I went down and deep-sea stalked my echinoderm loves in the Pisces V back in 2000. The following are not images from that expedition but a mix of pix from past voyages of HURL's Pisces V submersible... Thanks to Chris Kelley at HURL for allowing me to use them!

1. Aspidodiadema hawaiiensis. Here's a neat species that is also observed in the Bahamas. It has these long freaky spines, which they use to MOVE.

These urchins remind me of the giant black spy spider robot from Johnny Quest....


2. Phoromosoma bursarium. What survey of deep-sea echinoderms is complete without some echinothuriids?? I wrote up a blog on these for Deep-Sea News awhile back as one of the 27 BEST Deep-Sea species (it made the top 10!).

Basically, these are weird urchins that walk around on hoof-like spines. Some genera have these big puffy sacs of unknown function.
But one thing I HAVE experienced from firsthand observation-those spines on these critters? They STING. A colleague of mine at MBARI experienced this during the North Pacific Expedition last year.

3. Chaetodiadema pallidum. There's not very much known about this species, but in and around the Hawaiian region between 50 and 402 m on fine sediment.
These can be VERY abundant... and bringing up a bunch of them doesn't do them justice when they are observed on video arranged in these almost unnatural distribution patterns... spooky!
Who needs science fiction when you've got reality?

4. Chondrocidaris gigantea..Speaking of freaky... Here's one of the shallower-water urchins that you see in deeper waters.. Note that the spines are completely covered over by overgrowth..sponges or other encrusting invertebrates, perhaps?

In this species and other cidaroid urchins (you'll be seeing these below) the spines LACK epidermis and you get all kinds of weird things growing on them..

Here's a little bit I wrote up on them last year...(a bit dated by the holiday theme)
5. Prionocidaris hawaiiensis. Another urchin about which we know very little...
Except that we know where they occur in 92-214 meters? They are VERY abundant!
6. Histocidaris variabilis. What's weird with this one? It has BARNACLES that grow on the spines!! Similar in some ways to the way that Chondrocidaris has sponges and etc. on the spines...
7. Acanthocidaris hastigera. Not much known about this one..but dang, its cool-looking ain't it?
8. Caenopedina pulchella These are neat because the coloration on the spines is actually EMBEDDED in the spine calcite. So, even the preserved ones are red and green!
9. Phrissocystis multispina This is one of the weirder ones... This is a spatangoid urchin (i.e., a sea biscuit) and the group is known primarily from the fossil record.

But the living ones are VERY fragile. I've held dry specimens..and the sediment in the gut can literally cause the bottom of these to fall out from under them.
Thanks to Craig Young, Kevin Ecklebarger and J.L. Cameron we also know a little about its very strange-looking sperm and reproductive biology.

Enjoy! Seeya guys next week!

Starfish from Deep-Sea Hawaii- What Lives Below A Tropical Paradise!

Quick bookeeping/techie feature... Note that you can now share the Echinoblog to Facebook or Tweet it using the buttons at the bottom!!!

So, this week...a special TREAT! A recent visit by a colleague from the Hawai'i Undersea Research Laboratory (HURL) at the University of Hawai'i at Manoa has resulted in my being able to show all of my loyal Echinoblog fans some EXCLUSIVE images of the deep-sea fauna in the Hawaiian Islands!!

Hawai'i has some AWESOME shallow-water echinoderms. I've blogged about many of these species.

This includes such cool critters as Colobocentrotus-the shingle urchin and some uncommon/rarely seen starfish, such as Coscinasterias, Valvaster, and Astropecten. As well as some neat artistic renditions...

Most people don't realize that HURL one of the most active deep-sea laboratories in the United States with ongoing research in marine biology, oceanography, geology, and even anthropology (discovering World War II submarines and shipwrecks for instance!)

They operate not one but TWO manned submersibles in American waters-the Pisces IV and the Pisces V. Plus a remotely operated vehicle.

Both subs are deployed off the mother ship, the Ka‘imikai-o-Kanaloa (often abbreviated KoK) which is Hawaiian for "Heavenly Searcher of the Sea" Here is the Pisces V being deployed from the aft deck of the KoK.

...and thanks to Craig Young, I've actually been down in the Pisces V (in 2001) and found it to be one of the coolest things I've ever done!

I've had a fairly LONG association with not only the Hawaiian Undersea Research Lab, but also the Invertebrate Zoology department at the Bishop Museum in Honolulu, Hawaii, where I helped identify and sort the echinoderms in the collection.

I was ultimately able to learn and help to identify the deep-sea starfish/sea star fauna in and around the Hawaiian Islands.

Its interesting that there's actually a much HIGHER diversity of deep-sea starfish around Hawai'i then shallow-water. But sadly, much of it is very poorly known. We continue to discover new things about the invertebrate fauna around the Hawaiian Islands on a regular basis!

Thanks to HURL..I am now able to share the diversity of (at least some of) this fauna with you!

What follows are images taken by the Hawaiian Undersea Research Laboratory of the animals in their habitat. (sorry for the bars at the top-these designate the species, dive and locality...)

Bear in mind...there are NO common names. Why? Because almost NO one other then scientists and possibly the occasional deep-sea fisherman, who gets one caught in a net gets to see these!

1. Anseropoda insignis. A weird deep-sea species found throughout the Indo-Pacific, but ONLY in deep-water (This one from 200-300 m or so..) The body is FLATTENED and almost PAPER-THIN. And are easily damaged when collected by trawl nets...so you almost never see them alive like this....

These are decent sized, about 8 to 10 inches across.

2. Tremaster mirabilis. I blogged about this as a species, "about which, little is known.."

but here..we see it sitting practically FLUSH on the sea bottom.. About 4-6 inches in diameter.

3. Astropecten polyacanthus. I just thought it would be interesting to show that even shallow-water species can get quite deep. This one was from less then 100 m (I'll have to check exactly how deep). Here is a post I did about one found in shallow-water.

4. Pentaceraster cumingi. At one time, this species was more commonly encountered at SCUBA depth, but I have anecdotally heard that because of its large size lack of abundance, and slow movement, this species has been rendered "locally extinct" in some places because people take them. But still occur in fairly deep-water (50-130 m)...

These are big..almost a foot and a half across..as are most oreasterids.

5. Asterodiscides tuberculosus. This is a species that you can see at the deeper end of a SCUBA dive. There are two toenail-like plates at the end of each arm. We know almost nothing about it.

Decent sized animals..about 6 to 8 inches across.

4. Ctenophoraster hawaiiensis. This species was described by Walter K. Fisher in 1906. We know nothing about it. This species is about 7 to 9 inches across.

5. Tamaria triseriata. Another species that is really pretty..but whose biology is unknown.
About 5 to 6 inches across.

6. Calliderma spectabilis (which is a synonym of Calliderma emma). These are amazing to see on video. They get BIG..and are almost a foot and a half across (armtip to armtip)! Probably because of their size, these are collected quite frequently.

It is interesting to note that the genus Calliderma also occurs in the Cretaceous of Europe, which suggests that this may be one of those critters that has been around and unchanged for quite a long time...

7. Calliaster pedicellaris. This is a pretty handsome animal. Sharp, cone-shaped spines cover the edge and the surface. We know pretty much nothing about it other then that.

Good sized about 6-7 inches across.

8. Coronaster eclipes. Another BEAST of a starfish! These can be VERY big..almost a foot and a half across. Possibly a predator? Described by Walter K. Fisher in 1925 and until the submersibles began operation...rarely encountered since then...

9. Brisinga panopla What's a bunch of deep-sea pictures without a brisingid or three?
There are actually about four species of brisingid that are known in and around the Hawaiian Islands..

What are brisingids? Short answer: starfish/sea stars that are deep-sea filter feeder/predators. Go here to read more! plus, they have Cool names. (go see!)

These can get to be over a foot in diameter.
So, this is NOT all of the species...just the ones I thought were immediately interesting. There's a LOT more. How many more?? Go check out this checklist for the starfish I helped develop..
and here's the master list for all Hawaiian Invertebrates..

Hopefully...I'll get to show some other species at some point...

Interested in more Hawaiian Invertebrates??

Here's a GREAT book-"In Deeper Waters" by two of the primary scientists at HURL available at Amazon..
and here is John Hoover's excellent field guide to shallow water (with some overlapping into the deep-sea) invertebrates!

More Exotic Hawaiian Starfish! Valvaster and Astropecten!

Today, MORE Exotic Hawaiian starfishes sent to me to ID!! Thanks to Gordon Hendler (Los Angeles County Museum) who found the specimens and Cory Pittman, who photographed the specimens!

Let me caveat that Astropecten (family Astropectinidae) is VERY hard to identify from pictures! In a professional sense, having vouchers is the best way to ID them..

First, Astropecten polyacanthus Like all Astropecten (there are 2 in shallow-water Hawaii), this species burrows into the sea bed and live under a fine veneer of unconsolidated sediment, where they feed on various small, molluscan fare..snails, clams, etc.

This beast is about 2 inches in diameter and was collected in Maui from about 9.0 m. It is distinguished from the 2nd species by having spines in each interradius and adults should only have one spine per superomarginal plate (but this is difficult from pictures)A second specimen (also discovered by Hendler/ photographed by Pittman) from Maui at about 10 m is possibly a Astropecten triseriatus myobrachius. This specimen was only about an inch in diameter.
This species differs slightly, in having 2-3 spines per plate and is missing the spines pointing aborally (i.e., upward) in each interradius..

Although, this seems like A. t. myobrachius to me, its entirely possible that this is some kind of juvenile of the species above with smaller features.

THESE are the kinds of FACTORS that make taxonomic identification difficult (and challenging)!

Valvaster striatus (family Ganeriidae), has been known for awhile (described by Lamarck in 1816) but we know NOTHING about it except for the name. Its definitely a RARELY encountered, but thankfully, easy to identify, species in Hawaii (known from Oahu and Maui), but is known widely throughout the Indo-Pacific including Guam, the Philippines, Australia, and the Indian Ocean. in less than 20 m depth. Found and photographed by Cory Pittman.We DO know something about the etymology of its name, of course. Notice that on the side of the animal, are large bivalved pedicellariae, which are sort of like big clamps that sit on the lateral side of the animal (see white circles below). Hence Valv for the valves on each pedicellariae and -aster for star.. And the adjective striatus refers to the striated patterns on the body surface
Color in this species varies....This one is darker with green where others are more red...
This animal was from Guam and is a borrowed image from Gustav Paulay's excellent FMNH site on Indo Pacific animals.

Note that this one in Wikipedia? NOT Valvaster (looks like an oreasterid or a goniasterid). Pls. make a note of it!

Have a great weekend everyone!

...from Hawaii: Something you don't see every day Coscinasterias acutispina!

Today a cool pic of an uncommonly seen starfish from Hawaii! Coscinasterias acutispina!

The animal was found by Pauline Fiene and was photographed by nature photographer Cory Pittman (and should be copyright by him). Both Pauline and Cory oversee the cool Sea Slugs of Hawaii site.

Coscinasterias acutispina is an asteriid-that is, its related to those common intertidal starfish, such as Asterias or Pisaster that feed on mussels and clams on the east and west coasts of North America.
The beast above was observed in Kahului Harbor in Maui. It's about 30 mm in diameter and was found at less than 3 m depth, under rubble. These have been reported from Hawaii in the past, but have been so infrequently encountered that they are actually absent from the excellent Hawaiian Sea Creatures book by John Hoover.

Generally, starfishes in the family Asteriidae occur in cold-water regions like Antarctica or Alaska, but every so often-you get a couple that pop up in temperate to tropical shallow waters. For various reasons, asteriids and other forcipulatacean starfish don't generally live in tropical shallow-waters. So, seeing one outside of temperate water is unusual.

Coscinasterias occurs rather widely though, and you can find other species from New Zealand to the tropical Atlantic...Here's some basic taxonomic info..
This species also occurs in Japan, China, Australia, and other regions throughout the Indo-Pacific. Here is a pic of this species from Japan....

(pic taken from Chiba Museum site)

where it is known by the name yatude hitode, which I believe means "evergreen-palm leaf starfish" (Thanks to Yoicihi K. for the heads up!)

Coscinasterias acutispina is unusual in that it is fissiparous (i.e., it can reproduce asexually-by pulling itself apart), has between 7 to 12 arms and feeds on limpets and other small mollusks.

Ya' wanna know more about unusual Hawaiian Starfish?? Go visit John Hoover's site here.

And thanks to the wonder of Teh Internets! Here is a Youtube Video of this species (but from Japan..I think??) !!

EDIT-Note that there are tiny, little snails on the underside that might be parasitizing the starfish (I don't think they are being fed upon). Thanks to Mudskipper for the call!


Enjoy!