Review of Euchromadorinae (Nematoda: Chromadorida) with description of a new species of Trochamus Boucher & De Bovée, 1971 from the Sundarban, India Author Datta, Tridip Kumar ENVIS Centre, Zoological Survey of India, M-Block, New Alipore, Kolkata- 700053, India. Author Al-Helal, Md. Abdullah Vidyasagar University, Department of Zoology, Paschim Medinipur, Midnapore- 721102, West Bengal, India. text Zootaxa 2023 2023-05-08 5278 3 493 510 http://dx.doi.org/10.11646/zootaxa.5278.3.4 journal article 10.11646/zootaxa.5278.3.4 66cdc377-c9b8-476a-9cc1-d504e654b52a 1175-5326 7906615 5B09ECEE-2A61-411F-A172-5FD86939905F Subfamily Euchromadorinae Gerlach & Riemann, 1973 Diagnosis. (after Decraemer&Smol2006 ): Chromadoridae .Body cuticle with complex heterogeneous ornamentation along the body (rarely homogeneous as in Endeolophos Boucher, 1976 ), often with lateral differentiation. The six outer labial and four cephalic sensilla setiform and may be arranged in a single circlet. Amphideal fovea transverse slit-like or oval, located posterior to the cephalic setae. Buccal cavity with large dorsal tooth, with or without denticles or smaller ventrosublateral teeth. Pharynx with or without defined terminal bulb. Gubernaculum usually with hammer- or L-shaped lateral pieces (wrongly indicated as telamon). Pre-cloacal supplements absent but a pre-cloacal differentiation of body cuticle may be present. Marine. Diagnosis of the genera: Until date Euchromadorinae is comprised of 11 valid genera.