Marionina riparia Bretscher, 1899

Lee, Jeounghee & Jung, Jongwoo, 2016, New record of three aquatic species of Enchytraeidae (Annelida: Clitellata) from Korea, Journal of Species Research 5 (3), pp. 541-546 : 544-545

Marionina riparia Bretscher, 1899 ( Fig. 3 A-F)

Marionina riparia Bretscher, 1899: 400 ; Michaelsen, 1900: 77; Nielsen and Christensen, 1959: 120­121, Figs. 168­172; Kasprzak, 1972: 25­27, Figs. 6­7; Kasprzak, 1986: 168­170, Figs. 399, 412, 427, 580­593; Rota and Healy, 1994: 65.

Enchytraeoides riparius Černosvitov, 1928: 12-14 , Fig. 2 .

Pachydrilus (Marionina) riparius Černosvitov, 1942: 211­212 , Figs. 40­50.

Material examined. 1 individual was collected from Siljeon­ri, Hacheong­myeon, Geoje­si, Gyeongsangnamdo. E: 128°39′23.65″, N: 34°58′27.35″, 25 Apr 2013 (collector: Lee J). One individual mounted on a slide was deposited at NIBR ( KOSPIV0000193714 ) .

Measurement. Length 2.40 mm, width 0.06­0.18 mm, number of segments 24 in fixed state.

Diagnosis. Brain two times as long as wide, lightly concave anteriorly, strongly concave posteriorly ( Fig. 3A ). Chaetae equal­sized within a bundle with straight, ental hook distinct( Fig. 3B, C ). Clitellum with reticulate ( Fig. 3D ). Pharyngeal glands 3 pairs with a very narrow. Sperm funnel barrel­shaped, narrower toward the end. Paired spermathecal attached to the oesophagus ( Fig. 3E ). Coelemocytes anucleate with spindle shape in vivo ( Fig. 3F ). Remarks. This material agree well with the previous descriptions ( Rota and Healy, 1994; Torii, 2012), expect for the body size in fixed specimen. The body length of our specimen has shorter than the species of Japan ( Torii, 2012).

World distribution. Austria, China, Czechoslovakia, Denmark, Finland, France, Germany, Great Britain, Italy, Ireland, Japan, Lebanon, Northern Africa, Poland, Romania, Spain, Sweden, Switzerland.

Figures

Fig. 3. Marionina riparia. A. shape of brain; B. anterior ventral chaetae; C. posterior ventral chaetae; D. clitellum; E. spermatheca; F. Coelemocytes (Scale bars: A, F=10 μm, B, C=20μm, D, E=50μm).

Fig. 2. Henlea montana. A. shape of brain; B. anterior body region; C. spermatheca; D. chaetae per bundles; E. coelomocyte; F. clitellum (Scale bars: A=50μm, B=100 μm, C-F=20 μm).