Necturus Lab Flashcards
to what superclass does necturus belong
tetrapoda
to what order does necturus belong
urodela
what is the species name for necturus
maculosus
what is the optimal temperature for necterus
18 C
where is necturus found most commonly
in streams having a stony bed
necterus has neoteny, what does this mean
does not undergo metamorphosis, retains larval characteristics in adult
what is necterus integument made of
epidermis and dermis (no scales)
what is the epidermis made of
stratum basalis
what is stratum basalis
layer of low columnar cells with several layers of increasing numbers of polyhedral cells and flattened cells near surface
what is characteristic of the epidermis
numerous flask shaped cells that seem to be glandular in nature (responsible for slime production)
what are chromatophores
pigment cells (usually green)
what is the dermis composed of
outer looser stratum spongiosium and inner compact stratum compactium
where are the poison glands
dorsal surface of body
how many external gills are there
3 on each side of body
what do gill slits communicate with
pharynx
what is the gular fold
dividing line between head and trunk
what is the cloacal aperture
excretory organ
what is the ventricle
large thick walled posterior chamber of the heart
what are the atria
pair of bulbous sacs in top half of the heart
what are atrioventricular valves
between atria and ventricle
what is the conus arteriosus
vessel extending anteriorily from ventricle
what are semilunar valves
located at junction of conus and ventricle
what is the bulbus arteriosus
continuation of conus arteriosus, branches to give blood to gills
what is the sinus venosus
recieves blood from all parts of body except lungs, from this chamber to sinoartia valve
