(a) Operculum – (viii) Osteichthyes
(b) Parapodia – (v) Annelida
(c) Scales – (iv) Reptilia
(d) Comb plates – (i) Ctenophora
(e) Radula – (ii) Mollusca
(f) Hairs – (vii) Mammalia
(g) Choanocytes – (iii) Porifera
(h) Gill slits – (vi) Cyclostomata and Chondrichthyes