What is common b/w earthworm and Periplaneta ?
both have red coloured blood
both possess anal styles
both have malpighian tubules
both have metamamerically segmented body
As we have learned
Metameric Segmentation -
Body externally and internally divided into segments with a serial repetition of at least some organs.
- wherein
Eg. Annelia, Arthropoda and chordate.
Earthworm belongs to Annelida and Periplaneta belongs to Arthropoda