Prostoma canadiense, Gibson & Moore, 1978

Kajihara, Hiroshi, 2025, A taxonomic revision of the freshwater monostiliferous hoplonemertean genus Prostoma Dugès, 1828 (Nemertea: Eumonostilifera): a radical solution or an over-lumping?, Zootaxa 5646 (4), pp. 451-500 : 464

3. canadiense Gibson & Moore, 1978

Source. In the binomen “ Prostoma canadiensis ” [sic] by Gibson & Moore (1978: 80, figs 1–6).

Type locality. Parry Sound , Georgian Bay, Lake Huron, Canada ( Fig. 9 ) .

Etymology. Adjective, canadiensis , - is, - e, meaning “from Canada ”.

Remarks. With up to 12 proboscis nerves, P. canadiense has been regarded as a valid taxon ( Gibson 1995: 494; Chernyshev et al. 1998: 61; Sundberg & Gibson 2008: 62); in the holotype, the proboscis nerves were 10 or 11 in number. Future molecular studies will confirm whether this character state falls within the range of intraspecific variation. Until then, this nominal species should be considered synonymous with P. clepsinoides . See Discussion for the validity of other taxonomic characters.

Figures

FIGURE 9. World map showing distribution of 25 nominal species of freshwater monostiliferous hoplonemerteans indicated by boxes and respective species-group names (three subterranean species are indicated with ‘S’ in parentheses); circles, diamond, and triangles indicate localities of DNA-barcoded individuals; circles, Haplogroup 1 from the UK, Sweden (SE), Italy (IT), Macedonia (MK), Japan (JP), New Zealand (NZ), Mexico (MX), Indiana (IN), and Massachusetts (MA); diamond, Haplogroup 2 from Norway (NO); triangles, Haplogroup 3 from Sweden (SE) and California (CA).