Andamia tetradactylus (Bleeker 1858)

Description: Dorsal fin XVI-XVII, 17-18, spines with filamentous tips, the 2nd dorsal spine elongated particularly in males; anal fin II, 23-24; pectoral rays 15; pelvic fin I,4; unbranched caudal rays; last anal ray bound to caudal fin by a membrane. Mouth with numerous movable jaw teeth; crenulated lips margin; lower lip with fleshy disc, cup-shaped. Both sexes with occipital crest; nuchal cirri absent; supraorbital cirrus pinnate; nasal cirrus small and simple (Ref. 559, 90102). Body elongate; depth at anal fin origin 7.5-8.5 in SL. Overall greyish brown, ventrally white; body with spotty vertical bars; head and base of pectoral fin with spots, brown and small (Ref. 90102).

Distinct pairing (Ref. 205).

Dorsal spines (total): 16 - 17; Dorsal soft rays (total): 17 - 18; Analspines: 2; Analsoft rays: 24 - 25

Found on rocks in the surf line constantly washed by sprays or breakers. Attains less than 12 cm TL. Oviparous. Eggs are demersal and adhesive (Ref. 205), and are attached to the substrate via a filamentous, adhesive pad or pedestal (Ref. 94114). Larvae are planktonic, often found in shallow, coastal waters (Ref. 94114).

分布於西太平洋區，包括日本、台灣、菲律賓及印尼等。台灣分布於南部、北部、東北部及東部等海域。

小型魚類，僅具學術研究價值。

體長橢圓形，稍側扁；頭鈍短。上下唇具鋸齒緣，下唇後方具有杯狀的肉質盤；上頜齒可自由活動，成魚之上頜齒數通常超過120。雄、雌魚皆無冠膜；具鼻鬚及眶上鬚，無頸鬚；側線孔無微小而交疊之鱗片狀皮瓣覆蓋。D. XV-XVII(通常為XVI), 17-21； A. II, 24-25；P. 15； V. I, 4。背鰭具淺缺刻，雄魚背鰭較雌魚高，雄魚第II棘延長如絲；背鰭與尾柄以鰭膜相連，臀鰭不與尾柄相連；尾鰭軟條不分支。頭側與胸鰭有黑點或黃紋，眼後下方具一黑邊白紋；體側有黃或白色點；雄魚的臀鰭為暗色；雌魚臀鰭灰白色，其餘鰭較雄魚淡些。

主要棲息於潮間帶浪拂區，常在洞穴或縫隙間穿唆，受驚嚇時可見其用一前一後的方式跳躍於潮池與空氣間。可直接在空氣中呼吸。以藻類為食。卵生。

Andamia tetradactylus is a species of combtooth blenny found in the western Pacific Ocean, around the Ryukyu Islands and Indonesia. the IUCN classify this species as Data Deficient as this species, Andamia heteroptera and A reyii are confused and their exact distributions are uncertain.