Animal Diversity and Systematic Zoology
Animal diversity and systematic zoology is the classification and comparative study of animal body plans; UPMSP tests hierarchy, phylum-level diagnostic features, and life cycles of representative animals.
Core rules
- Use binomial nomenclature: genus capitalised, species lower case, italicised; author and year not italic.
- Hierarchy: Kingdom–Phylum–Class–Order–Family–Genus–Species.
- Body-plan terms: symmetry (radial, bilateral), germ layers (diploblastic, triploblastic), coelom (acoelomate, pseudocoelomate, coelomate), segmentation, and fate of blastopore.
- Phylum signatures: Porifera-choanocytes, spicules; Cnidaria-cnidoblasts, radial symmetry; Platyhelminthes-flattened, acoelomate; Aschelminthes-pseudocoelom; Annelida-metamerism, nephridia; Arthropoda-chitinous exoskeleton, jointed appendages; Mollusca-mantle, radula; Echinodermata-water-vascular system; Chordata-notochord, dorsal hollow nerve cord.
- Life cycles: Ascaris is direct; Fasciola uses a snail; Taenia uses pig/cattle; Plasmodium uses human and female Anopheles.
Worked example
A specimen is triploblastic, bilaterally symmetrical, has a true coelom, closed circulation, metameric segments and nephridia. That combination rules out Platyhelminthes (acoelomate) and Aschelminthes (pseudocoelom); it fits Annelida, e.g. Pheretima posthuma. The closed circulatory system and nephridia are the decisive clues.
Traps
Do not confuse pseudocoelom with true coelom; radial symmetry with biradial; and worm as a taxonomic group-flatworms, roundworms and earthworms belong to different phyla. Learn one host for each parasite life cycle.