Flashcards in Lab 7: Invertebrate Diversity Deck (53):
Modern __________ organizes life in a hierarchy based on available evidence for shared ancestry.
The hierarchy is composed of groups that reflect __________ degrees of similarity.
The hierarchy is composed of these groups:
Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species
A name created by combining both an organism's genus and species group.
The Kingdom Animalia is also known as the __________.
The Kingdom Animalia is a __________ group.
A long history of systematic work based on morphology and developmental traits has been used to build a __________.
More recently, molecular research has been used to build a phylogeny of the __________.
A body plan w/o a body cavity.
What are the three germ layers in order?
Ectoderm, mesoderm, endoderm
A large phylum composed of segmented worms, where some organs repeat in segments. Includes earthworms, leeches, polychaete worms, and other groups.
The most diverse phylum, >80% of described living species. All members have jointed appendages, an exoskeleton, and a segmented body. (Examples: spiders, scorpions, horseshoe crabs,crabs, crayfish, insects, centipedes, millipedes, lobsters, shrimp, etc.)
An organism with a left and right side. There is only one way to cut these organisms in half and obtain two matching halves.
Rod adjacent to the nerve cord.
A phylum of about 44,000 species, all of which share a notochord and pharyngeal gill slits at some developmental stage. They also share a hollow dorsal never cord and post-anal tail.
A diploblastic phylum of >9,000 aquatic species, all distinguished by stinging cells. Includes jellyfish, Hydra, anemones, and corals.
A body plan with a membrane-lined body cavity, permitting more organization than the other two body plans.
A mode of development of the digestive system during which the mouth forms second (anus first).
Tissues derived from two embryonic layers: ectoderm and endoderm.
Organisms that molt.
A phylum of about 7,000 marine species including starfish, brittle stars, sea urchins, sand dollars, sea cucumbers, and crinoids.
The outer layer of tissue in the gastrula. Gives rise to the skin and nervous system.
Inner layer of tissue in the gastrula. Gives rise to most of the digestive system and multiple internal organs.
Organisms with true tissues.
Tissue organization requires major __________, __________, and __________ processes.
Organizational, genetic, developmental
Whorl of tentacles.
A clade of organisms that share one of two characteristics: either a lophophore mouthpart or a trochophore larval stage.
A layer of germ tissue that fills the space between endoderm and ectoderm.
A diverse phylum of about 93,000 species, all of which have a large cavity used for breathing and excretion and lined with a tissue (mantle), and 2 or 3 nerve cords.
Snails and slugs are __________.
Clams and muscles are __________.
Squid and octopi are __________.
Typically small, narrow worms, >80,000 described species, about 1/5 are parasitic. Very numerous and ubiquitous. Complete gut, longitudinal muscles only.
A type of asexual reproduction in which females produce offspring from unfertilized eggs.
An acoelomate phylum of about 20,000 species without circulatory and respiratory organs. Many are important human or animal parasites.
Informally known as sponges. They lack true tissues; instead, they are composed of several different cell types.
A mode of development of the digestive system during which the mouth forms first (anus second)
A body plan with a body cavity that is not membrane-lined by mesoderm tissue.
The organism can be cut in half in any direction to obtain two matching halves.
A phylum of tiny aquatic pseudocoelomates with cilia surrounding the mouth that appear to rotate when beating. This phylum comprises almost 2,000 species divided into two main groups with diverse shapes.
Having tissues derived from all embryonic layers: ectoderm, mesoderm, and endoderm.
Sponge "skeletons" are comprised of __________.
Structures formed from calcium carbonate or silica.
All __________ have true tissues derived from embryonic germ layers.
Two distinct stages exist within the cnidarian life cycle; a __________ and a __________.
Polyp and medusa
A sessile life stage in which the organism adheres to the substrate and uses its tentacles to capture prey from the water.
A motile life stage which moves within the water column.
The echinoderms are more closely related to __________.
__________ have a water vascular system.
All mollusks have three main body parts:
The visceral mass, mantle, and foot.