The Branchiobdellida,is a group of small annelids that contains parasites or commensals of crayfish.They show similarities to both oligochaetes and leeches in that they bear a head sucker.In your analysis,is the evolution of a head sucker a derived trait in an oligochaete lineage or would the loss of posterior sucker place them in the Hirudinea?

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The Answer of The Branchiobdellida,is a group of small annelids that contains parasites or commensals of crayfish.They show similarities to both oligochaetes and leeches in that they bear a head sucker.In your analysis,is the evolution of a head sucker a derived trait in an oligochaete lineage or would the loss of posterior sucker place them in the Hirudinea?

The Branchiobdellida,is a Group of Small Annelids That Contains Parasites