Cernosvitoviella minor Dózsa-Farkas, 1990

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 : 27

Cernosvitoviella minor Dózsa-Farkas, 1990 , sensu lato

( Figure 13 )

Material examined. 6 specimens (two were deposited in the National Institute of Biological Resources , Korea; NIBRIV0000860937, in 70 % ethanol) .

2–3.3 mm long, 140–200 μm wide at VIII and 150–280 μm at XII, segments 19–24. Chaetae sigmoid with nodulus, up to 7–8 per bundle ( Fig. 13C ). The clitellum saddle-shaped, the glandular cells in transverse rows, absent ventrally ( Fig. 13A ). Brain incised posteriorly, about 1.5 times longer than wide. Two pairs of primary and two pairs of secondary pharyngeal glands. Dorsal vessel originating at XII or XIII, blood light pink. Anterior bifurcation in segment III ( Fig. 13G ). Nephridia mostly unpaired in 6/7–7/8 and 8/9 or 9/10 ( Fig. 13B ). Coelomocytes variable, with either coarse refractile granules (black in transmitted light) or hyaline cytoplasm ( Fig. 13B ). The sperm funnels cylindrical, about 30–40 μm long and 2 times longer than wide, with high collar ( Figs 13A, D, E ). Sperm ducts about 5 times longer than the funnels, with uniform diameter (6 μm) and without or with a small dilatation at the opening. Male pores surrounded by glands ( Figs 13A, F ). Spermatozoa 26–29 μm long. Spermathecae also variable but confined to V, similarly to the description of Dózsa-Farkas et al. (2017). The ampulla sphaerical, but the length of the ectal duct is variable. In some specimens, they are short ( Fig. 13H ), in other specimens, the ducts are much longer ( Fig. 13I ). Mostly one large egg is present at a time ( Figs 13A, D, F ).

Distribution and habitat in Korea. Muljangori-oreum Wetland, Bonggae-dong, Jeju-si, Jeju-do, N 33°24’29.04”, E 126°36’23.41”, 812 m asl; Mt. Chiaksan, Hakgok-ri, Socho-myeon, Wonju-si, Gangwon-do, soil of mixed forests, Q. serrata forest, N 37°23’36.50”, E 128°03’15.30”, 395 m asl.

Figures

FIGURE 13. Micrographs of Cernosvitoviella minor Dózsa-Farkas, 1990, sensu lato. A. Clitellar glands, ventral view (glands absent between penial bulbs, ventral borders of clitellum marked with white arrows, sperm funnels marked with black arrows). B. Nephridium at 6/7 (marked with black arrow); black and hyaline coelomocytes (marked with white arrows). C. Chaetae in ventral bundles. D, E. Sperm funnels (marked with black arrows); chloragogen cells (marked with white arrow, e=egg). F. Penial bulbs. G. Anterior bifurcation of dorsal blood vessel in III, blood pink. H, I. Spermathecae. All in vivo. Scale bars 50 μm, E, I 20 μm.