Level of organisation, symmetry, germ layers, coelom, one diagnostic feature and named genera for every phylum from Protozoa to Hemichordata, with the first-to-show table.
Unit 2 carries 4 of the 40 Zoology marks on one chapter whose MEC scope line reads "Diagnostic features and classification from Protozoa to Chordata." Roughly three of the four questions fall on the non-chordate phyla covered here; the companion note Chordata and the vertebrate classes takes the rest. Expect:
The overview note General Characteristics and Classification (Protozoa to Chordates) gives one line per phylum. This note applies the same yardsticks to every phylum, names one feature no other phylum has, and gives genera you can write from memory.
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See the plansClassification of the Animal Kingdom
Phylum-by-phylum diagnostic features from Porifera to Chordata, with examples.
Diagnostic features and classification: Chordata and the vertebrate classes
The chordate characters, what happens to the notochord in the three subphyla, and the seven vertebrate classes compared on skin, heart, temperature and reproduction.
Animal Diversity and Classification: Unit Map and Reading Order
What the classification unit covers, how many questions it carries, and how its two notes divide the animal kingdom.
Zoology Rapid Revision — Numbers, Ratios & Sequences
Human physiology values, genetic ratios, hormone-to-gland maps and the classification characters MECEE-BL tests — the recall layer of the 40-mark Zoology block.