Rat dissection labs start next week and continue for three weeks total (Labs 1012) Dissection kits are (check your drawers but you are welcome your own kit provided now), to bring Lab 9: Animals III: Deuterostomes TODAY YOU HAVE A
HAND IN FOR YOUR EXIT ACTIVITY Task C-2 today does NOT deal with echinoderms and chordates Lets do it first! Task C-2: Invertebrate keying
work as a pair get one of the invertebrate keying boxes use the dichotomous key (Table 9-1) CORRECTIONS to Table 9-1 in your lab manual: 9. Two pairs of antennae; cephalothorax present........subphylum Crustacea/class Crustacea 9. One pair of antennae, cephalothorax absent................(mark out old subphylum here)...10
10. Wings usually present; three pairs of walking legs....subphylum Hexapoda/class Insecta 10. Wings absent; more than three pairs of walking legs..............subphylum Myriapoda...11 Task C-2: Invertebrate keying fill in Table 9-3 for each organism in the box (TAs will be checking for this as part of your exit activity) if you dont know common names, ask a TA
not all have subphyla you should expect to be able to make such phylum, subphylum, and class identifications on the lab final (without help or a key) for these and any other specimens that have been in lab Phylum Echinodermata coelomate; unsegmented
pentamerous radial symmetry water vascular system dermal endoskeleton with spines Phylum Echinodermata
4 selected classes to examine in lab: Asteroidea (sea stars or starfish) Ophiuroidea (brittle stars) Echinoidea (sea urchins and sand dollars)
Holothuroidea (sea cucumbers) watch the video for body plan and feeding. Task A-1: Phylum Echinodermata examine the preserved specimens, note the following: for each: compare to Fig. 9-1, note body plan 5part radial symmetry, endoskeleton, lack of segmentation Asteroidea (sea stars)
five arms, madreporite, central disc, mouth, tube feet, coelom Ophiuroidea (brittle stars) five arms, central disc Task A-1: Phylum Echinodermata examine the preserved specimens, note the following:
Echinoidea (sea urchins and sand dollars) look for pentamerous characteristics; jaws Task A-1: Phylum Echinodermata examine the preserved specimens, note the following: Holothuroidea (sea cucumbers) not typically sedentary, just slow (lab manual is wrong) Radial muscle
Cloa ca & vent Phylum Chordata group unified by four traits present at some point in the life cycle for all members Phylum Chordata
three subphyla Urochordata tunicate or sea squirt Cephalochordata lancelet or amphioxus Vertebrata have a backbone; fish, amphibians, reptiles, birds, and mammals (classes listed later) watch the video for some information on the body plan and development.
Task B-1: Invertebrate Chordates examine the preserved specimens and models, note the following: Urochordata tunicate or sea squirt sessile adult; cellulose tunic, holdfast, siphons, pharynx
image on following slide. Task B-1: Invertebrate Chordates examine the preserved specimens and models, note the following: Cephalochordata lancelet or Amphioxus
specimen, model, and slide; match to Figs. 9-2 and 9-3 note oral hood, fins, myotomes, dorsal nerve cord, notochord, pharynx, pharyngeal gill slits, postanal tail; other items from figures Subphylum Vertebrata Vertebrata 7 selected classes Agnatha jawless fish
Chondrichthyes cartilaginous fish (sharks, skates, and rays) Osteichthyes bony fish with paired fins Amphibia two pairs of legs; smooth skin (frogs, salamanders, etc.)
Reptilia two pairs of legs; scaly skin (lizards, snakes, alligators, etc.) Aves feathers; paired wings and legs (birds) Mammalia hair, mammary glands, two paired appendages Task B-2:
Subphylum Vertebrata obtain a vertebrate box and examine the preserved specimens, note the following: Agnatha brook lamprey jawless; single median dorsal and caudal fins (no paired lateral fins); 7 pairs of external gill slits Chondrichthyes shark
scales (makes sandpapery skin); various fins (note especially those in pairs); claspers on pelvic fins of mature males; cloacal opening Task B-2: Subphylum Vertebrata Osteichthyes yellow perch scales, operculum over gills, various fins (note
pairs); lateral lines (from operculum to caudal fin) Amphibia leopard frog and salamander smooth skin (no scales); 4 legs count digits; tympanum on frog; eyelids (do other box items have eyelids?) Task B-2: Reptilia green anole lizard, turtle, and garter snake
Subphylum Vertebrata scaly skin, 4 legs (reduced to vestigial in snake); lizard claws, eyelids; turtle carapace and plastron Aves and Mammalia no specimens demonstration table identify specimens by class (you do NOT include them on Table 9-2, but they ARE eligible to be on the lab final)
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