Question

The mollusc which is considered to be a living fossil and also shows characters of annelids like nephritis and internal segmentation is

• A. Pinctada vulgaris
• B. Nautilus
• C. Neopilina galatheae
• D. None of the above

Answer 1

The correct option is C Neopilina galatheae

Molluscs are not a segmented group and Neopilina might be an exception to this.
Neopilina has certain organs such as nephridia (kidneys), heart, gills etc that are same as that in annelids (like earthworms) and arthropods like insects and spiders and crabs.
Molluscs are not a segmented group and it appeared that Neopilina might be an exception and so a potential 'missing link' between the molluscs on one hand and the annelids and arthropods on the other.
Thus, the correct answer is (C), Neopilina galatheca.