Stichostemma grande, Ikeda, 1913

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 : 468

10. grande Ikeda, 1913

Source. In the binomen Stichostemma grandis [sic] by Ikeda (1913: 240, text-figs 1–2, pl. IV, figs 1–5).

Type locality. A botanical garden in the Hiroshima Normal School (now Hiroshima University), Hiroshima, Japan ( Fig. 9 ) .

Etymology. Latin adjective, grandis , - is, - e, meaning “large”.

Remarks. Ikeda (1913: 248) compared Prostoma grande with P. graecense , P. eilhardi , and P. asensoriatum in terms of nine characters (maximum body length, body colour, presence/absence of frontal organ, presence/absence of sensory spines, number of eyes, number of proboscis nerves, degree of posterior extension of cephalic glands, number of gonads, and mode of hermaphroditism [simultaneous/protandrous]). Prostoma grande was regarded as a valid taxon by Stiasny-Wijnhoff (1938: 226), but as a nomen dubium by Gibson & Moore (1976: 195) and listed as an invalid name by Gibson (1995: 495). It is now considered synonymous with P. clepsinoides .

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).