Euchromanema Kulikov & Dashchenko, 1991

Venekey, Virag, Gheller, Paula F., Kandratavicius, Noelia, Cunha, Beatriz Pereira, Vilas-Boas, Ana Carolina, Fonseca, Gustavo & Maria, Tatiana F., 2019, The state of the art of Chromadoridae (Nematoda, Chromadorida): a historical review, diagnoses and comments about valid and dubious genera and a list of valid species, Zootaxa 4578 (1), pp. 1-67 : 52

Genus Euchromanema Kulikov & Dashchenko, 1991

Kulikov & Dashchenko (1991) established Euchromanema when describing E. cervicornia Kulikov & Dashchenko, 1991 and E. paracervicornia Kulikov & Dashchenko, 1991 from the Sea of Japan. There is no mention of Euchromanema in the recent review of Tchesunov (2014) and we did not find any other reference or discussion about the status of this genus apart from the original description. Kulikov & Dashchenko (1991) stated that the new genus is comparable with Endeolophos and Actinonema by the size of dorsal tooth, position of head setae and presence of lateral differentiation of cuticle. According to the authors, Euchromanema differs from the genera mentioned above by the prominent pharyngeal posterior bulb and relatively simple ornamentation of cuticle. However, in our opinion the prominent bulb is not sufficient to unequivocally differentiate Euchromanema from Actinonema as in the last there are species with different stages of development of the bulb. In fact, the bulb seems to be double in the illustration of E. cervicornia provided by Kulikov & Dashchenko (1991) and this character is present in other genera of Chromadoridae such as Chromadorissa and Megodontolaimus . Furthermore, Euchromanema can not be distinguished from Endeolophos based on the simple ornamentation of the cuticle, as this genus also has a relatively simple ornamented homogenous cuticle. Considering all information presented here, we prefer to consider this genus as dubious.

Genus Euchromanema Kulikov & Dashchenko, 1991

1. Euchromanema cervicornia Kulikov & Dashchenko, 1991 (Sea of Japan)

2. Euchromanema paracervicornia Kulikov & Dashchenko, 1991 (Sea of Japan)