Free-living marine nematodes in Andhra Pradesh Coast, India Author Sivaleela, Gunasekaran Author Surendar, Chandra Author Kumar, Rubavath Rajendar text Records of the Zoological Survey of India 2021 121 2 283 301 journal article 10.26515/rzsi/v121/i2/2021/151251 2581-8686 13186309 8. Actinonema pachydermatum Cobb, 1920 * (Figure 4A-C) 1920. Actinonema pachydermatum Cobb. Contributions to a science of nematology, 9 : 339. Material examined : Male , 1♂ , ( Reg. No. N. 352), Hope Island Date , 2.iv.2016 , Coll. G. Sivaleela. Diagnostic characters: This species distinguished by the presence of oval amphid with a double contour, L- shaped curved spicules. Description : Body length 0.7 mm . Maximum diameter of body is 29 µm. Cuticle ornamentation heterogeneous and complex. Amphid about 0.7 c.d wide. Oesophagus with posterior bulb. Tail conical pointed tip about 5 a.b.d. Spicules telamons. Ventral enlarged annules extend about 7 a.b.d anterior to cloaca. Distribution : Continental shelf of eastern Arabian Sea ( Sajan and Damodaran, 2007 ); Continental slope of Bay of Bengal (Mani, 2008). Elsewhere : North-east England , Northumberland coast. Remarks : This species is closely related to the earlier description of Platt & Warwick (1983) by its oval-shaped amphids and differs in the cuticle from other species, so this species placed as A. pachydermatum