Marionina communis Nielsen & Christensen, 1959

Felföldi, Tamás, Dózsa-Farkas, Klára, Nagy, Hajnalka & Hong, Yong, 2020, Three new enchytraeid species (Enchytraeidae, Annelida) from mountain soils of Korea and ten species new for the country, Zootaxa 4896 (1), pp. 1-45 : 32-33

Marionina communis Nielsen & Christensen, 1959

( Figure 19 )

Material examined. 7 specimens (three were deposited in the National Institute of Biological Resources , Korea; NIBRIV0000837804, NIBRIV0000866131, NIBRIV0000866132, in 70 % ethanol) .

Our observations agree with the description of Nielsen & Christensen (1959). Small worms (3–5 mm long, 230–250 μm wide at XII in vivo), segments 24–27. Chaetae straight, 2–3 per bundle. Clitellum saddle-shaped, gland cells in rows ( Fig. 19C ), glands absent midventrally. Brain incised posteriorly ( Fig. 19A ). Pharyngeal glands all separate dorsally, with ventral lobes, in VI largest ( Fig. 19D ). Coelomocytes oval 18–24 μm long, pale, finely granulated ( Fig. 19B ). 4 pairs of nephridia preclitellarly at 6/7–9/10. Dorsal blood vessel from XIII, blood colourless. Sperm funnels small, pear-shaped, 37–50 μm long, 1.5 times longer than wide ( Fig. 19E ). Penial bulbs small, compact ( Fig. 19F ). Spermathecae ( Figs 19 G–H) with elongated ampulla, merging proximally and attached to oesophagus. Ectal ducts narrow and bearing at the ectal pore some glands of different size. One mature egg at a time ( Fig. 19F ).

Distribution and habitat in Korea. Mt. Gyebangsan, Nodong-ri, Yongpyeong-myeon, Pyeongchang-gun, Gangwon-do, Q. mongolica forest, N 37°42’27.92”, E 128°29’02.34”, 848 m asl.

Figures

FIGURE 19. Micrographs of Marionina communis Nielsen & Christensen, 1959. A. Brain. B. Coelomocytes. C. Clitellar glands, dorsal view. D. Pharyngeal glands, dorsal view. E. Sperm funnels. F. Penial bulbs (e=egg). G, H. Spermathecae. All in vivo. Scale bars 50 μm.