Vocabulary Terms Exam 2 Flashcards
Carapace
a bony or chitinous case or shield covering the cephalothorax
Cephalothorax
the fused head and thorax of spiders and other chelicerate arthropods.
Coronate Larva
the free living developmental stage of Bryozoans that emerge from ovicells. They are nonfeeding and ciliated
Decapodid Stage
Larvae of decopods that swim with their pleopods
Dentrobranchiate Gills
branched gills
Endopod
inner medial branch of two branched crustacean leg or appendage
Epipod
lateral extension from the base of an appendage
Exopod
Outer lateral branch of two branched crustacean
Hexapoda
the largest grouping of arthropods that includes insects
Manca
post larval juvenile of some isopods
Marsupium
broad pouch specialized for carrying, protecting, and nourishing newborn young
Maxilliped
an appendage modified for feeding
Megalops
larval stage following zoea in crab development, first stage after egg
Nauplius
a larval form with three pairs of appendages and a singe median eye
Pereopod
an appendage of the pereon - 7 articles coxa, basis, and endopodal articles ischium to dactyls
Phylobranchiate
A type of decapod gill bearing a double series of platelike or leaflike branches from the axis
Pilidium larva
in nemertini, a free swimming larva which develops directly from the gastrula
Subchelate
an appendage in which the dactylus is shorter and less robust than the peropodus
Tadpole larva
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Tornaria larva
planktonic larva of some hemichordates
Trilobite larva or stage
3 lobed larva that is a developmental form of limulus and resembles a trilobite
Uropod
posterior appendage found in a variety of crustaceans (normally locomotive)
zoea
any of the free swimming larva of certain crustaceans (crabs) having rudimentary legs and a spiny carapace
homoplasy
correspondence between parts or organs acquired as a result of parallel evolution of convergence
monophyletic
a group composed of a collection of organisms, including the most recent common ancestor of all those organisms and all the descendants of that most recent common ancestor
polyphyletic
a group composed of a collection of organisms in which the most recent common ancestor of all the organisms is not included usually because the common ancestor lacks the characteristics of the group.
