Genus Innocuonema Inglis, 1969

The genus Innocuonema was erected by Inglis (1969) to accommodate Graphonema amokuroides, Graphonema clivosa, Graphonema flaccida and Graphonema tentabunda, since they share a dorsal onchium controlled by a massive development of the dorsal pharyngeal musculature, a posterior pharyngeal bulb and a small gubernaculum. The species I. norwegicum (Allgén, 1932), I. paraheterophyum (Allgén, 1932), I. pusillum (Allgén, 1947), I. spectabile (Allgén, 1932) and I. suillum (Allgén, 1947) were considered as species dubia . Graphonema amorukoides was renamed as Innocuonema chilense Inglis, 1969 . Later, I. asymmetricum Blome, 1985 was described and I. chitwoodi (Wieser, 1954) was considered synonym of I. tentabunda (Blome 1985) . Although the uniqueness of the cuticle and buccal cavity of Innocuonema has been recognized, all the remaining diagnostic characters are shared with Dichromadora and Chromadorita (Table 3) (Decraemer & Smol 2006 and Tchesunov 2014).

Diagnosis (modified from Tchesunov 2014): Cuticle punctuated and heterogeneous, with no lateral differentiation. Anterior sensilla in three separate circles with four terminal cephalic setae. First circle (inner labial setae) conspicuous in two species [ I. clivosum (Wieser, 1959) and I. flaccidum (Wieser, 1959)]. Somatic setae present. Amphideal fovea transverse, slit-like. Buccal cavity with a large dorsal tooth. Dorsal apophyses and a tiny ventrosublateral tooth may be present. Peribuccal pharyngeal tissue slight swelling in dorsal. Pharynx with a single posterior bulb. Precloacal supplements absent. Marine.