Prostoma sebethis, Monticelli, 1910

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 : 472

23. sebethis Monticelli, 1910

Source. In the binomen Prostoma sebethis by Monticelli (1910a: 33).

Type locality. Sebeto , a small river running in Naples, Italy ( Fig. 9 ) .

Etymology. A feminine noun in the nominative/genitive singular (both cases have the same ending); Sebethis is a nymph, daughter of the river and god Sebethus , near Naples ( Mandelbaum 1981: 400).

Remarks. Also mentioned as a new species in Monticelli (1910b: 367) and described in more detail in Monticelli (1916: 401–417, pl. 16, figs 1–8), which, however, was based on a single, immature specimen. Stiasny-Wijnhoff (1938: 222) and Gibson & Moore (1976: 194) regarded Prostoma sebethis as a nomen dubium, and Gibson (1995: 498) listed it as an invalid name. 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).