Vernix caseosa is a protective substance that covers the surface of the skin of the fetus during the sixth and seventh month. In Latin, what does caseosa mean?
Annelids are found worldwide in all types of habitats, especially oceanic waters, fresh waters, and damp soils. Most polychaetes live in the ocean, where they either float, burrow, wander on the bottom, or live in tubes they construct; their colours range from brilliant to dull, and some species can produce light. The feather duster (Manayunkia speciosa) inhabits the Great Lakes and some rivers of the United States.
PHYLUM ANNELIDA (segmented worms) The name âAnnelidaâ means âlittle ringâ, which refers to the segments that make up their bodies. As in molluscs, a fluid-filled body cavity, the coelom , is present. Earthworms, leeches, and an. assortment of segmented marine worms belong to this phylum.