Rhynchactis macrothrix Bertelsen & Pietsch 1998

Length of illicium 109-144% SL, distal tip bearing 3-4 small unpigmented filaments, some with tiny distal swelling; distal 28-57% illicial length bearing series of 11-20 secondary filaments, five longest filaments measuring 6-15%SL; each secondary filament with 1-2 unpigmented terminal filaments, some with tiny distal swelling; large specimens (110-113 mm) with secondary filaments darkly pigmented to base of terminal filaments, divided on each side by a narrow, well-defined longitudinal transparent band (Ref. 86949).

Dorsal soft rays (total): 4; Analsoft rays: 3

以往僅分布於大西洋及印度洋西部，臺灣是太平洋唯一記錄。臺灣分布於東北部海域。

極罕見魚類，全世界目前僅5尾標本，除學術研究外，無經濟價值。

身體延長，體型較其他科別大(角鮟鱇科及鞭冠鮟鱇科除外)，略為側扁；頭部佔身體比例小，約35%SL以下；吻觸手位於鼻端稍後部位；不具餌球。吻觸手長度109-144 %SL，末端有3-4不具色素細絲，部分具有末端膨大；吻觸手末端28-57 %SL處具有11-20第二分支，其中最長五分支長為6-15 %SL；第二分支具有1-2不具色素之細絲；部分第二分支具有一縱向透明帶。最長尾鰭鰭條34-37 %SL；背鰭鰭條3-4；臀鰭鰭條3；胸鰭鰭條17-18；下頜不具齒，變態後雌魚齒骨退化；較小的魚體通常會有上頜牙齒；口腔上部具有乳突狀或魚卵狀腺體，稱之為口腔腺(oral gland)；大型標本表皮具清楚之微細棘，小型則無。

主要棲息於光線微弱或無光線之深海區；幼魚為漂浮性，生活在食物豐富的海洋上層水域；變態期後的魚種則生活在遠洋深海中層或深層水域。

Rhynchactis macrothrix is a species of whipnose angler found in the Atlantic and western Indian Oceans where it is found at depths of around 2,000 metres (6,600 ft). This species grows to a length of 13 centimetres (5.1 in) SL.