Marionina grisea, STEPHENSON, 1932

Klinth, Mårten J., Rota, Emilia, Martinsson, Svante, Prantoni, Alessandro L. & Erséus, Christer, 2022, New insights into the systematics of Lumbricillus and Marionina (Clitellata: Enchytraeidae) inferred from Southern Hemisphere samples, including three new species, Zoological Journal of the Linnean Society 194 (4), pp. 1103-1133 : 1126-1127

MARIONINA GRISEA STEPHENSON, 1932

( FIG. 12 )

Marionina grisea Stephenson, 1932: 243–246 , figs 4, 5.

Lumbricillus griseus – Nielsen & Christensen, 1959: 96.

Type material: BMNH 1933.2.23.901–903, three sectioned specimens (studied). Syntypes. Loc. Wiencke Island , Palmer Archipelago. ‘ Discovery’ 1925–1927 ( Stephenson, 1932) .

Type locality: Shore of Port Lockroy , Wiencke Island, Palmer Archipelago .

Additions to Stephenson’s original description: Chaetae ~75 µm long. Epidermis covered with rows of pale gland cells and deeply staining granular gland cells. Dorsal vessel with peristomial bifurcation. Nephridia ( Fig. 12B ) in 7/8–10/11 and postclitellar segments. Ventral nerve cord with small anterior subbuccal bulb; see Marionina discussion above. Sperm funnels ≥ 450 µm long, 160 µm wide. Spermathecae ( Fig. 12A ) ≥ 300 µm long, 110 µm wide at duct and 70 µm wide at ampulla, with glands ~75 µm wide surrounding pore.

Remarks: This species is discussed together with M. aestuum and M. fusca .

Figures

Figure 12. Marionina grisea. A, BMNH 1933.2.23.902, spermatheca. B, BMNH 1933.2.23.901, segments VIII–X. C, BMNH 1933.2.23.902, male apparatus. Abbreviations are defined under ‘Taxonomy’. Scale bars: 100 μm.