Below is a brief introduction to some of the organisms that will be collected on the cruise.
Annelids: invertebrate phylum of about 16,500 species of segmented worms that include familiar species such as earthworms, leeches and a wide variety of other forms including sand and tube worms.
|Polychaetes: most marine worms belong to this group.|
Crustaceans: animals such as krill, shrimp and lobsters that have a hard external shell that protects their body.
|Amphipods: laterally compressed crustaceans.
|Barnacles: crustaceans that are often attached to hard surfaces.
|Copepods: a very common planktonic crustacean.
|Euphausids: krill; planktonic shrimp-like crustaceans.
|Isopods: a group of dorsal-ventrally flattened crustaceans.
|Ostracods: planktonic crustaceans that look like clams.|
Ctenophores: transparent, planktonic jelly-like animals that are sometimes mistaken for jellyfish.
|Some ctenophores, like Beroe (right), lack tentacles.|
Echinoderms: marine invertebrate phylum of about 7,000 species that includes sea stars, sand dollars, sea urchins and others that have 5-part symmetry; most adults in this phylum are benthic.
Asteroids: sea stars
- star-shaped body with five or more arms off a central disk.
Crinoids: sea lilies & feather stars
- body forms a cup with arms extending out from the cup.
Echinoids: sea urchins & sand dollars
-body is globe-shaped with spines.
Holothuroids: sea cucumbers
- body is sausage-shaped and long.
Ophiuroids: brittle stars
- body has five arms distinctly separated from a central disk.
Foraminiferans: planktonic protists with a calcareous shell.
|Most foraminiferans are small in size.|
Molluscs: invertebrate phylum of about 93,000 species almost all of which have an inner or outer shell and a soft body; includes clams, snails, sea slugs, octopus, squid and other shelled invertebrates.
|Bivalves: molluscs with two shells hinged together.|
|Cephalopods: octopi & squid; molluscs with well-developed heads.|
|Gastropods: molluscs with a single, often spiraled shell.|
|Nudibranchs: a group of shell-less gastropods.|
Nemerteans: ribbon worms; unsegmented worms that can extend their bodies.
|Nemerteans secrete toxins that deter many predators.|
Pterobranchs: a small colonial group of hemichordates, related to echinoderms.
|Pterobranchs are small filter-feeders, often in deep waters.|
Pycnogonids: sea spiders; marine members of the phylum Arthropoda.
|They are closer relatives to spiders than crabs or insects.|
Radiolaria: planktonic protists with spines made of silica.
|Radiolarian skeletal remains cover large portions of the ocean bottom.|
Salps: marine planktonic members of the group Tunicata; closely related to sea squirts.
|The most abundant concentrations of salps are near Antarctica.|