Prostoma eilhardi, Montgomery, 1894

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 : 467

8. eilhardi Montgomery, 1894

Source. In the binomen Stichostemma eilhardi by Montgomery (1894: 12).

Type locality. A water basin in the Berlin Zoological Institute , Berlin, Germany ( Fig. 9 ) .

Etymology. Masculine noun in the genitive singular, after Franz Eilhard Schulze (1840–1921), a German anatomist and zoologist and a professor at Friedrich Wilhelm University of Berlin (now Humboldt University of Berlin); Schulze was a supervisor of Thomas Harrison Montgomery Jr.’s (1873–1912) doctoral thesis.

Remarks. Stichostemma eilhardi is the type species of Stichostemma Montgomery, 1894 (gender neuter; fixed by monotypy, Article 68.3). It was proposed in Montgomery (1894) and Montgomery (1895), both of which are almost identical in content. Montgomery (1894) was an inaugural dissertation that was publicly defended on 5 December 1894. Montgomery (1895) appeared in Volume 59, Number 1, of Zeitschrift für wissenschaftliche Zoologie, issued on 8 March 1895. The exact publication date is not stated in Montgomery (1894). The name eilhardi may be deemed to have been published on 5 December 1894, according to Article 21.3 (Date incompletely specified). Although P. eilhardi has been regarded as valid by subsequent researchers ( Stiasny-Wijnhoff, 1938: 227; Gibson & Moore, 1976: 200; Chernyshev et al. 1998: 61; Gibson 1995: 495; Sundberg & Gibson 2008: 62), it is herein 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).