Bigfin Catshark

Diagnostic features include the very short abdomen, with interspace between pectoral and pelvic fins base shorter than 3/5 of anal fin base length; pectoral fin tip reaching beyond the midpoint between pectoral and pelvic fins; first dorsal fin smaller in area than the second dorsal; posterior end base (axil) of second dorsal clearly in front of anal fin axil; low anal fin with a long base. Egg capsule very slender; without tendrils, conical posterior end. Claspers without hooks, with posterior margin of exorhipidion forming a free lobe (Ref. 37959). Black, brown or grey (Ref. 11146), without conspicuous markings on fins (Ref. 244).

Oviparous, paired eggs are laid. Embryos feed solely on yolk (Ref. 50449).

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0

Found on the continental slopes. Poorly known. Oviparous, probably one egg per oviduct laid at a time. Not utilized at present.

fisheries: of no interest

分布於西北太平洋區，包括台灣及日本。臺灣發現於東北部海域。

主要以底拖網捕獲，一般以下雜魚處理。

體延長，前部縱扁，後部側扁；體柔軟。吻中長，寬而扁，不及眶間隔的1.5倍；口前吻長略大於口寬。眼中大，背位，眼徑約為眶間隔的1/2倍，下眼瞼上部分化成瞬褶。前鼻瓣三角形突起。口較寬，弧形；唇褶發達；齒細小密列，上下頜齒同型，具3-5齒尖，齒數多達60餘。噴水孔中大，位於眼後角。背鰭2個，狹小，兩背鰭間距大於第二背鰭基底；第一背鰭稍小於第二背鰭，起點位於腹鰭及臀鰭基底間；第二背鰭起點與臀鰭基底後部相對；胸鰭寬大，前緣與後緣圓凸；臀鰭基底長，距尾鰭比距腹鰭近；尾鰭長但窄，尾椎軸低平，上葉發達；尾鰭下葉前部三角形突出，中部低平，與後部間有一缺刻，後部低平而與上葉相連。體一致為黑褐色，腹面較淡，各鰭緣和鰓孔均黑色。

深海魚類，可能為底棲性，生態習性不甚明瞭。

The spatulasnout catshark (Apristurus platyrhynchus), also known as the Borneo catshark or flatnose catshark, is a catshark of the family Scyliorhinidae, found in the western Pacific between 35°N and 1° N. Its length is up to 80 cm.