SIO 132 Lecture Notes - Lecture 12: Starfish, Actinopterygii, Planula
31 Aug 2018
School
Department
Course
Professor
Document Summary
Life cycles: the sequence of all different morphologies or ecologies through which an organism passes from a single cell of one generation to create a single cell of the next generation. Ca(cid:374) (cid:271)e i(cid:374)a(cid:272)ti(cid:448)e or a(cid:272)ti(cid:448)e (cid:894)a(cid:272)ti(cid:448)e is (cid:373)ore (cid:272)o(cid:373)(cid:373)o(cid:374)(cid:895: active example- most monogenean flatworm typical parasites, it has benthic/demersal host, nektonic host, and planktonic host. Indirect parasite life cycles- use multiples host in sequence: example- trematode flatworms (platyhelminthes) Spawning aggregations- black surgeon fish: coordinated meeting up- demersal spawning which lays eggs on the substrate and then the male comes through and does it. Slide 29- sea snails are hermaphrodites, the lobsters on slide 30 can only mate when their shell as been shed off and then the male can come in: barnacles have the longest penis compared to their size. Slide 38- nemo and clown fish- males are small, females large and territorial, the removal of female causes male to switch, a juvenile then becomes male.
