New enchytraeid species from Mount Hallasan (Jeju Island, Korea) (Enchytraeidae, Oligochaeta) Author Dózsa-Farkas, Klára Author Felföldi, Tamás Author Nagy, Hajnalka Author Hong, Yong text Zootaxa 2018 2018-10-05 4496 1 337 381 journal article 29257 10.11646/zootaxa.4496.1.27 e8ba8a68-c584-48d8-bfba-f4d2fd163e97 1175-5326 1446851 7C536E1E-5D5A-4E2D-9E4F-28F3CEA9664C Fridericia perrieri ( Vejdovský, 1878 ) Only one specimen was found. Length 17.7 mm , width 460 µm at VIII and 550 µm at the clitellum in vivo . Length of fixed specimen 10.4 mm , width 520 µm at VIII and 490 µm at the clitellum. Segments 47. Chaetal formula 4,5 – 4,5,3,2: 4,5,6 – 4,5,3,2, in the segment XII absent. The chaetae within a preclitellar bundles of the two largest outer chaetae 58–60 by 5 µm, the middle pairs 55–58 by 5 µm the innermost chaetae much smaller 25–30 by 3 µm ( Fig. 21B ), posteriorly maximum 68–75 by 5 µm. Head pore at 0/I. Dorsal pores from VII. Clitellum in XII–1 /2XIII, girdle-shaped, gland cells arrangement reticulate ( Fig. 21C–D ). Body wall 32–25 µm, cuticle 2–2.5 µm, fixed. Brain egg-shaped, 155 µm long and 99 µm wide, fixed ( Fig. 21A ). Oesophageal appendages a-type with a few longer branches posteriorly. Pharyngeal glands in IV with dorsal connection and separate small ventral lobes. Pairs in V and VI without dorsal connection with ventral lobes ( Fig. 21F ). Dorsal blood vessel from XX, blood colourless. Midgut pars tumida were not observable. Five pairs of preclitellar nephridia from 6/7 to 10/11 . Coelomo-mucocytes numerous, mucocytes type a (length 23–32 µm, fixed), lenticytes numerous 8–10 µm long. Chylus cells between XIII–XVI. Seminal vesicle small. Sperm funnel about 125 µm long and two times longer than wide ( Fig. 21G ). Male copulatory organs compact, rounded diameter 60 µm and 32 µm high, fixed. Bursal slits longitudinal, staple-shaped ( Fig. 21E ). Subneural glands absent. Spermathecae: long ectal ducts without glands (270 µm long, 22 µm wide in vivo , 190 µm long and 20 µm wide, fixed), canal straight. Ampulla with two rounded, stalked diverticula (diameter 45–50 µm) containing sperm in a ring with rotating movement ( Figs. 19C , 21H ). Two mature eggs. Distribution and habitat. In Mt. Hallasan, only one locality: site 14, in soil and litter layers of Sasa quelpaertensis forest. Material examined. Only one specimen was found (it was deposited in the National Institute of Biological Resources , Korea NIBRIV0000810603, slide No. 2395.) Remarks. Unfortunately, only one specimen was found, but it agreed in traits with the description of F. perrieri ( Schmelz, 2003 ) .