ZOO 137 - Invertebrate Zoology Phylum Info File - Annelida

Kingdom Animalia -- Subkingdom Metazoa
Phylum Annelida (etymology: _____________________________________________)
Class Oligochaeta (etymology: _______________________________________)
(examples: ________________________________________________)

Class Polychaeta (etymology: ________________________________________)
(examples: ________________________________________________)

Class Hirudinea (etymology: _________________________________________)
(examples: ________________________________________________)

Things You Should Do Before Coming to the Lab on Annelids

o Memorize the classification given above.
o Study Chapter 16 in Animals Without Backbones
o Complete exercises 31-37 in The Zoology Coloring Book (read but you need not color Exs. 34-
35 and 37).
o Put your dissecting kit in your backpack; you're going to open an earthworm.

Things You Should Do During the Lab

o Study the external morphology of the clamworm, Nereis (called Neathes in the PAZ). This is a common intertidal, predaceous annelid. Besides the structures shown in PAZ Figs. 8.2 and 8.3, know the head structures in ZCB exercise 32. There will be a bowl of specimens from which to choose on the dissection cart.

o Study the model of the earthworm (night crawler), Lumbricus.

o Study the external morphology and dissect an earthworm using PAZ Figs. 8.6 - 8.9 and 8.11 - 8.12 as your guide. Know all the structures in PAZ Figs. 8.7, 8.11 and 8.12 except the gonads and their ducts. Know also those indicated in PAZ Figs. 8.8 and 8.9. If available, living earthworms will be provided for observation of locomotion and internal structures under a dissecting microscope on the demonstration desk. If extra specimens are available, you may choose to dissect a living specimen -- please ask your instructor.

o Examine at your seat a prepared slide showing a x.s. of Lumbricus through the intestinal region of the body. You should know those tissues, etc. indicated in PAZ Fig. 8.13. Note that there is an error in 8.13 - no. 11 guidelines point to the gastrodermis; the chlorgogue is the lighter colored tissue the gastrodermis touches.

o Observe the following demonstration specimens:

-- a slide showing a w.m. of a parapodium of Nereis (see PAZ Fig.8.5, but recognize only the setae)
-- a preserved specimen of a species of giant earthworm (and there are some much bigger!)
-- preserved specimens of leeches (you need only recognize them as such.)
-- preserved specimens of several types of polychaetes (you need not know their names)

Things You Should Do After the Lab

o Using all sources available to you, make a list of ten important features, characteristics, etc. of the nematodes. (a true coelom; segmentation, complex organ systems, to mention but a few).