19. Acipenseriformes (1 answer). a. possess osseous (bony) ossa capitales (head

Question

19. Acipenseriformes (1 answer). a. possess osseous (bony) ossa capitales (head bones) b. are ineffectual suctorial ingesters of aliment (food) c. possess protrusible gnathoi (jaws) d. possess a superior gnathos that is fused to the cranium e. are pelagic f. are solely freshwater taxa 20. Acipenseriformes (1 answer. a. reproduce in the sea b. possess squamae that are sexistrigate (in 6 rows) c. possess gnathoi that exhibit exiguous protrusion d. are lethargic e. are neotropical or paleotropical f. possess a prolonged, planar rostrum g. include the Chinese paddlefish, whose considerable population has been partially depleted 21. Polypteriformes (2 answers). a. are representatives of Actinopteri b. are representatives of Chondrostei c. are representatives of Cladistia d. possess abbreviated pyknic corpus e. possess few fins f. possess a supraoesophageal gaseous bladder 22. Ostariophysi (Ostarioclupeomorpha)(2 answers) a. ingest prey of substantial magnitude b. possess ostaria (small bones) that unite auris interna and the air bladder, augmenting audition (hearing) c. manifest exiguous diversity d. liberate pheromones upon cutaneous injury e. include bonefishes f include Ostraciformes, which propel themselves in water via corporal sinuosities or undulations

Explanation / Answer

19. Answer is option c possess protrusible jaws. Acipenseriformes contain paddle fish and sturgeons. They live in both fresh water and sea. For reproduction they come back to fresh water.

20. Answer is option g) include Chinese paddle fish. They are not lethargic or neotropical.

21. Answer is option b) representatives of chondrostei. a) representatives of actinopteri.

Polypteriformes have lot many fins and swim bladder. They are under family actinopteri and order chondrostei.

22. Answer is option d) liberate pheromones upon cutaneous injury. e) include bony fishes.

They will liberate pheromones on injury and almost 8000 bony fishes are included in this category.

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