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Flea - Wikipedia In 2005, Medvedev listed 2005 species in 242 genera, and despite subsequent descriptions of new species, bringing the total up to around 2500 species, [20] this is the most complete database available The order is divided into four infraorders and eighteen families
Organismal Exam 3 Mastering Bio Questions (With Choices) -The origin of all extant animal phyla can be traced to the Cambrian explosion -Most animal phyla belong to the clade Radiata -Eumetazoans have three embryonic tissue layers -Sponges are diploblastic animals -All animals share a common ancestor , A graduate student finds an organism in a pond and thinks it is a freshwater sponge
Features Used to Classify Animals - OpenEd CUNY Scientists have developed a classification scheme that categorizes all members of the animal kingdom, although there are exceptions to most “rules” governing animal classification Animals have been traditionally classified according to two characteristics: body plan and developmental pathway
Leech - Wikipedia Some 680 species of leech have been described, of which around 100 are marine, 480 freshwater and the remainder terrestrial [ 4 ] [ 5 ] Among Euhirudinea , the true leeches, the smallest is about 1 cm ( 1 ⁄ 2 in) long, and the largest is the giant Amazonian leech, Haementeria ghilianii , which can reach 30 cm (12 in)
Jellyfish - Wikipedia In most cases, adults release sperm and eggs into the surrounding water, where the unprotected eggs are fertilized and develop into larvae In a few species, the sperm swim into the female's mouth, fertilizing the eggs within her body, where they remain during early development stages
Life of the American Lobster - Lobster Institute - University . . . Scientific name: Homarus americanus The American lobster can be found in the waters off the North Atlantic – ranging from Virginia up through the Canadian Maritimes Lobsters are aquatic arthropods of the class Crustacea As such, they have segmented bodies; chitinous exoskeletons (a hard outer shell); and paired, jointed limbs (Examples of other crustaceans are […]
Chapter 33: Animal Diversity and the Evolution of Body Plans Radially symmetrical animals, such as this sea anemone (phylum Cnidaria), can be bisected into equal halves by any longitudinal plane that passes through the central axis b Bilaterally symmetrical animals, such as this turtle (phylum Chordata), can only be bisected into equal halves in one plane (the sagittal plane)