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Free-living marine nematodes of the genus Megodontolaimus Timm, 1969 are represented by two species described from Bangladesh, namely M. coxbazari and M. sonadiae. The genus is characterized by six outer labial sensillae rather than labial papillae, as well as cresentic apophysis on the pharyngeal bulb, two-pronged dorsal tooth, single large ventral tooth and four cephalic sensilla. After more than four decades, M. coxbazari has been rediscovered from the intertidal coastal area of India for the first time as well as outside the type locality. M. coxbazari has one pair of alae along the body and a double oesophageal bulb similar to Timm's description. The length of whole body, oesophagus, tail, and sensilla are within the range as described in the type materials. This report on the occurrence of such an interesting nematode adds relevance to biodiversity assessments.

A small bodied, free-living marine nematode, Rhynchonema dighaensis sp. nov., is described from the intertidal sand of the east coast of India. It is characterized by having a small buccal cavity, longer left spicule and symmetrical dorsal gubernaculum apophysis. Other species of the genus are discussed with their type locality. A modified key has been prepared for species of Rhynchonema with an illustrated guide. Species of Rhynchonema primarily differ from each other by the shape and size of the spicules, shape of the gubernaculum and dorsal apophysis, size of the buccal cavity and position of the amphid.

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A new genus, Cyathoshiva, of free-living marine nematodes from the subfamily Cyatholaiminae (family Cyatholaimidae, order Chromadorida), is described from the Indian coast. The new genus differs from other known Cyatholaiminae genera in having a unique combination of morphological characters: buccal cavity with well-developed dorsal tooth and two subventral teeth, proximally unpaired gubernaculum and non-cup shaped supplements. The type species Cyathoshiva amaleshi gen. n. sp. n. is characterized by having multispiral amphids with 4.5 turns, punctated cuticle with a weak lateral differentiation, a conical tail, three supplements possessing both tubular and setoid parts, and a gubernaculum with a serrated and dentate distal end.