First records of two rare and enigmatic nematodes, Rhaptothyreus typicus Hope & Murphy, 1969 and Bodonema vossi Jensen, 1991 (Nematoda, Rhaptothyreidae and Bodonematidae), from seamounts in the Andaman Sea

We collected sediment samples from seamounts in the Andaman Sea, India, onboard RV Sindhu Sankalp using a spade corer. Rhaptothyreus typicus Hope & Murphy, 1969 was collected from a hydrothermally active seamount, whereas Bodonema vossi Jensen, 1991 was collected from both a hydrothermally active seamount and a ferromanganese crust-rich seamount. Both these nematodes are rare and have limited taxonomic and biogeographic information. These reports represent the first record of these species from the Indian Ocean and from seamount habitats.