Five sea cucumbers were collected from Gisamun and Gonghyeonjin of Gangwon-do, in the East Sea, Korea from 27 December 2009 to 14 November 2012. These specimens were classified as
Species of the family Synallactidae comprising mainly deepsea forms are cosmopolitan (Solís-Marín, 2005). Approximately seventeen genera of this family recognized at the present time(Paulay and Hansson, 2013). According to Deichmann (1930), genus
Specimens were preserved in above 95% ethyl alcohol, and their important morphological characteristics were photographed using digital camera(D7000; Nikon, Tokyo, Japan), stereo- and light-microscopy(Nikon SMZ1000, Eclipse 80
Class Holothuroidea de Blainville, 1830 Order Aspidochirotida Grube, 1840
1. Tentacle ampullae present ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙2 -Tentacle ampullae absent ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙Synallactidae 2. One gonad bundle located on left side of dorsal mesentery ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙Holothuriidae -Two gonad bundles located on left and right sides of dorsal mesentery ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙Stichopodidae
Synallactinae Ludwig, 1894: 8; Mitsukuri, 1912: 3. Synallactidae: Ohshima, 1915: 221; Deichmann, 1930: 85; Pawson, 1965: 15; Cherbonnier and Féral, 1981: 358; Rowe and Gates, 1995: 328; Paulay and Hansson, 2013: 123185.
Tentacle ampullae absent. Stone canal usually connected with body wall, sometimes opening outwards through body wall. Respiratory trees usually not connected with a mirabile net. No Cuvierian organ. Tables, rods and very rarely buttons present. Type genus: Synallactes alexandriLudwig, 1894. Genera 17(1 in Korea).
1. Table with four-armed disk and a long pillar ∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙∙Bathyplotes -Table with three-or four-armed disk and a short or no pillar∙∙∙∙∙∙∙∙∙∙∙∙∙∙Synallactes
Synallactes Ludwig, 1894: 21; Mitsukuri, 1912: 11; Ohshima, 1915: 221; Mortensen, 1927: 378; Deichmann, 1930: 106; Cherbonnier, 1952: 473; Solís-Marín, 2005: 570; Massin and Hendrickx, 2010: 600; Paulay and Hansson, 2013: 123471.
Body cylindrical or subcylindrical form. Tentacles 18-20 in number. Small tubercles on dorsal surface distinctly arranged in rows. Each ventro-lateral radius with tube feet arranged in one or more rows. Mid-ventral radius with tube feet arranged in distinct rows. Gonads subdivided into two tufts. Table consisted of a three- or four-armed disk, and a terminally divided or perforated, or both pillar. Type species: Synallactes alexandri Ludwig, 1894. Species 26(1 in Korea).
[Fig. 1.] Synallactes nozowai. A-E, Specimens in life; F-H, Specimens in alcohol. A, G, Dorsal side; B, H, Ventral side; C, Dorsal side with extruded gonads and gut; D, Ventral side with extruded gonads and gut; E, Tentacles, tube feet and gonads; F, Dorsal tubercle with small warts. go, gonad; gu, gut; re, respiratory tree; te, tentacle; tf, tube feet; tu, tubercle. Scale bars: A-D, G, H=3 cm, E=2cm, F=1mm.
[Fig. 2.] Synallactes nozowai. A, Calcareous ring; B, Table with four-armed disk from dorsal body wall; C, Table with three-armed disk from dorsal body wall; D, Table with four-armed disk from ventral body wall; E, F, Rods of tube feet; G, End of rod of tube feet; H, I, Curved rods of tentacle; J-L, End of curved rod of tentacle. I, interradial; R, radial. Scale bars: A=2 mm, B=200 μm, C-F, H, I=100μm, G, J-L=25μm.
Synallactes nozowai Mitsukuri, 1912: 23; Ohshima, 1915: 221; Paulay and Hansson, 2013: 529034.