Midterm 4 Flashcards
Protostome
spiral cleavage, mouth from embryonic blastopore
Deuterostomia
Radial cleavage, anus from embryonic blastopore
Lophophore
Crown of tentacles covered with cilia. Efficient feeding device. Cavity inside is part of coelom and. is fluid filled, acts as a gas exchange between environment and polemic fluid
Trochophore
A free swimming, feeding larval. stage that was a ring of ciliated cells in front of mouth
Protoroch
The ring of. cells around mouth. Mainly for locomotion but may be used for feeding
Radula
Protrusible organ in Molluscs. Has chitinous teeth pointed backwards. Moved by the odontophore
odontophore
Muscle that moves the radula. Found in Molluscs
Mantle
Secrets the shell. Wraps around each side of the body.
Mantle cavity
Space between the mantle and visceral mass. Houses the respiratory organs. Serves as a gas exchange. Digestive and reproductive systems empty into mantle cavity
Torsion
Process of anus and mantle cavity rotating 180* to above the head. Occurs at larval stage of Gastropods. Avoids the possibility of Fouling
Fouling
Waste washing back over gills
Coiling
Shell spiralling for better weight distribution. Occurs at larval stage. Right side becomes squished,
Biramous
Appendages with two distinct branches, found in crustaceans
Uniramous
Appendages unbranched/ with a single branch. Found in myriapoda, insects (hexapods)
Endostyle
One of the five chordate characteristics, ciliated sheet of mucous for food capture
Anaspid
Skull with no openings in the temporal area behind the orbit, found in turtles, evolutionary skull of all vertebrates
Diapsid
Skulls that have TWO temporal openings, one pair above cheek, one pair in the roof of the skull. Separated by a boney arch. Found in birds (Although highly modified) and all reptiles except turtles. Boney arch may have been lost in some species.
Synaspid
A SINGLE pair of temporal openings located low on the cheeks and bordered by a boney arch. Found in all mammals and their extinct ancestors
Amniotic egg layers
Characteristic of all amniotes. Have four layers: Amnion, Allantois, Chorion, Yolk sac
Amnion
Encloses embryo in fluid, cushioning
Allantois
Creates sac to store metabolic waste
Chorion
Surrounds entire contents of egg. Forms a respiratory organ along with allantois; removing carbon and acquiring oxygen.
Yolk sac
Also found in anamniotes, for nutrient storage, Larger in amniotes
Jacobson’s organ
Detects heavy moisture-borne odour particles in the air. Found in serpents
Pit organ
Located on the top of snakes heads, sensitive to radiant energy for temperature control
Parts of feathers
Quill (Calamus), Shaft (Rachis) Barbs, Barbules, Vane
Calamus
Quill, Hollow bit that emerges from kin follicle
Rachis
Shaft, Continuation of the calamus (Quill)
Barbs
Tiny Protrusion off of the rachis(Shaft)
Barbules
Tiny hooks protrusions off of the barbs that interlink with other barbules
Proboscis
Found in Nemertea and Acanthocephala. Long blind muscular tube used for food capture. In nermertea lies in interior cavity called Rhynchocoel. In Acanthocephala is ivanginable for parasitic attachment to host
Rhynchocoel
Interior cavity that houses the proboscis. Enteriorly enclosed. within mesoderm herfroe a true coelom. Found above the gut.
Setae
Tiny hairs. that. help anchor segments. during locomotion. Found in Annelids, but not the class containg leeches (Hirudinida)
