Euchromadorinae, Gerlach & Riemann, 1973

Datta, Tridip Kumar & Al-Helal, Md. Abdullah, 2023, Review of Euchromadorinae (Nematoda: Chromadorida) with description of a new species of Trochamus Boucher & De Bovée, 1971 from the Sundarban, India, Zootaxa 5278 (3), pp. 493-510 : 499

Key to the genera of subfamily Euchromadorinae

1 Spicules jointed and solid cuticular cones present anterior part of the body......................... Rhips Cobb, 1920

- Spicules not jointed and similar cuticular cones absent....................................................... 2

2 Massive squarish dorsal tooth (onchium)............................................... Steineridora Inglis, 1969

- Dorsal tooth not massive squarish........................................................................ 3

3 Amphideal fovea conspicuous and with double contour....................................................... 4

- Amphideal fovea inconspicuous or different shape.......................................................... 5

4 Pre- and postcloacal thickening ventrally in male....................................... Nygmatonchus Cobb, 1933

- Pre- and postcloacal thickening absent in male........................................... Actinonema Cobb, 1920

5 Rows of denticles in the onchial cavity............................................. Euchromadora de Man, 1886

- Rows of denticles absent or in different arrangement, if present................................................ 6

6 Gubernaculum with accessory piece(s).................................................................... 7

- Gubernaculum without accessory piece.................................................................. 10

7 Cuticle with lateral differentiation........................................................................ 8

- Cuticle without lateral differentiation............................................... Parapinnanema Inglis, 1969

8 Lateral differentiation runs from behind the head to the spinneret; pre- and postcloacal thickening in male............................................................................................ Portmacquaria Blome, 2005

- Lateral differentiation not reaching the spinneret, no such pre- and postcloacal modification.......................... 9

9 Lateral differentiation wing or crest like........................................ Crestanema Pastor de Ward, 1985

- Lateral differentiation simple smooth band without elevated wing or crest like................ Graphonema Cobb, 1898

10 Cuticle with homogeneous ornamentation and lateral differentiation as subcuticular discontinuity,................................................................................................... Endeolophos Boucher, 1976

- Cuticle with heterogeneous ornamentation and lateral differentiation crest-like as alae or ridge,............................................................................................ Trochamus Boucher & De Bovée, 1971