Enchytraeus christenseni Dózsa-Farkas, 1992

Dózsa-Farkas, Klára, Felföldi, Tamás & Hong, Yong, 2015, New enchytraeid species (Enchytraeidae, Oligochaeta) from Korea, Zootaxa 4006 (1), pp. 171-197 : 190

Enchytraeus christenseni Dózsa-Farkas, 1992

( Figure 12 , F–I)

NIBRIV0000320528, NIBRIV0000320529, slides 2019, 2020, two adult, fixed specimens whole-mounted in Euparal. The Korean specimens agree with the description in Schmelz & Collado (2010): small worm (2.3–4.3 mm long and 190–290 µm wide at VIII and 230–340 µm at clitellum, fixed, 24–30 segments). Chaetal formula: 2 – 2,3: 3 – 3. One pair oesophageal appendages. Sperm sack, sperm funnel ( Fig. 12 I) and male copulatory organ small ( Fig. 12 G). Coelomocytes with refractile vesicles ( Fig. 12 H). Clitellum saddle shaped ( Fig. 12 G). Spermathecal ectal ducts with uniform small glands on its entire length, the ducts longer than the spherical ampullae, ental ducts with separate openings into the oesophagus ( Fig. 12 F). New for the Korean fauna.

Figures

FIGURE 12. Micrographs of Fridericia peregrinabunda Michaelsen, 1913 (A – C, in vivo), Fridericia seoraksani Christensen & Dózsa-Farkas, 2012 (D – E, fixed), and Enchytraeus christenseni Dózsa-Farkas, 1992 (F – I). F. peregrinabunda: A – B. Spermathecae. C. Coelomocytes in 100 x magnification, the thickened cell borders clearly visible. F. seoraksani: D. Spermathecae. E. Clitelar gland cells, ventral view; between the two bursal slits (marked with arrow) there are hyaline and granular gland cells. E. christenseni: F. Spermathecae (fixed). G. Saddle-shaped clitellum, ventral view (pb = penial bulbs). H. Coelomocytes. I. Sperm funnel (marked with arrow). G – I in vivo. Scale bars 50 µm.