Biology Journal Day 3

Here we are this new day. I've found out that Earthworms are classified under Annelids because they have segmented bodies. Included in this Phylum are the ragworms and leeches. They are further divided into the Class Clitellata because they have a clitellum, a reproductive organ. The leeches are also endowed with a clitellum. Here the leeches , which are Hematophagous go their separate ways and the earthworms are further classified into Order Haplotaxida which they share with Tubifex worms. Finally, the Sub-Order Lumbricina contains only earthworms, although there are a variety of species. This are named according to Family, Genus and Species. In Singapore we actually have 15 species belonging to seven Genera, four Families and two Orders of terrestrial earthworms. The most interesting one is Pontoscolex corethrurus which is the commonest earthworm in Singapore. It is not native to our soil, but was probably transported here to colonize Singapore by our early human ancestors!