Dysomma longirostrum Chen & Mok 2001

This species is characterized by the following: with pectoral fin; origin of dorsal fin above tip of pectoral fin, predorsal length 17.9-18.6% TL; without intermaxillary teeth; snout very long, its length 25.7-32.1% HL; jaw long and slender, upper jaw length 42.0-52.1% HL; anus posterior, far behind pectoral fin, preanal length 24.0-24.3% TL; trunk is moderately long, trunk length 9.7-10.3% TL; upper jaw with multiple rows of teeth on upper jaw; multiple rows of small teeth on lower jaw, those on inner row larger than the rest; vomer with 5 compound teeth; head pores: SO 5, IO 8 (2 between nostrils, 2 below eye, 4 behind eye), M 7, POP 2, AD 1, ST 0, F 1; lateral-line pores: predorsal 11, prepectoral 3-6, preanal 20, total ca. 77 or ca. 96, the last at 2/3 HL before caudal fin; MVF 14-24-130 (holotype only); colour of body uniformly brown when preserved (Ref. 39632, 106136).

Vertebrae: 130

臺灣東北角海域。

不具經濟利用之價值。

體細長；體不具鱗；具胸鰭及尾鰭；吻長，佔全長之4.6%；上頷較下頷長，佔全長之8.2%；側線完整，達全長之95.6%；背鰭起點在胸鰭稍後；臀鰭在胸鰭一個上頷長之後；口裂遠超過眼之後緣；眼小；體長為體高之19.6 倍，頭長之7.0 倍；尾長為頭與軀幹之3.2 倍；頭長為吻長之3.1 倍； 吻長為眼徑之4.5 倍；無前上頷骨齒；上頷骨齒細小，形成齒帶；下頷骨齒一列，為較大之犬齒；鋤骨齒具五枚複合齒；脊椎骨數130，其模式為14-24-130。體全身呈深褐色；背、臀鰭上緣為白色。(資料引用自陳，2002)

屬底棲性魚種，在150公尺深處捕獲，僅一尾被捕獲。從胃部X 光攝影，推測其以甲殼類及軟體動物等為生。

Dysomma longirostrum is an eel in the family Synaphobranchidae (cutthroat eels). It was described by Chen Yu-Yun and Michael Hin-Kiu Mok in 2001. It is a marine, temperate water-dwelling eel which is known from Taiwan, in the northwestern Pacific Ocean. It dwells at a depth range of 100–150 metres. Males can reach a maximum total length of 19.6 centimetres.

The species epithet refers to the eel's long snout.