Diaphus lucidus (Goode & Bean 1896)

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.

Dorsal spines (total): 0; Dorsal soft rays (total): 16 - 18; Analspines: 0; Analsoft rays: 17 - 19

Oceanic and mesopelagic, found between 425-750 m during the day and between 40-550 m at night (most abundant below 200 m at night) (Ref. 4066, 4775). There is size stratification with depth both day and night (Ref. 4775).

Oceanic and mesopelagic, found between 425-750 m during the day and between 40-550 m at night (most abundant below 200 m at night) (Ref. 4066, 4775). There is size stratification with depth both day and night (Ref. 4775).

Diaphus lucidus

This tropical species (Backus et al., 1977) is represented in the Ocean Acre collections by 16 specimens, 29–75 mm standard length (SL) taken from June to September. It is a large species, attaining 118 mm (Wisner, 1976). The only known gravid females are 98 and 99 mm SL (Nafpaktitis, 1968). Most of the specimens were taken by the Engel trawl; two were taken in discrete-depth samples at about 175 m during the night in late summer.

頭部和體前部較大，尾部稍小。吻鈍圓、短。眼較大，口中等大，口裂超過眼眶後緣；上頜骨末端不擴大；兩頜和腭骨為尖銳絨毛齒齒帶，中翼骨具齒叢。鰓蓋後緣具弱齒，中部尖，上部凹形。鰓膜分離，不與峽部相連。體被圓鱗，側線完全。背鰭1個，起於腹鰭基上方；臀鰭起於背鰭末端的前下方，背、臀鰭基長幾相等；脂鰭位於臀鰭末端的稍前上方，胸鰭小，鰭條不達腹鰭基；腹鰭離胸鰭基較臀鰭基近，鰭條較胸鰭條長；尾鰭分叉。甲醛液浸標本體呈紅褐色。 發光器：鼻部背位發光器(Dn)發達，圓形，指向前方，直徑大於鼻囊，且其背緣高於眼眶上緣，鑲鉗於眼眶前上方的黑色杯形凹陷中；鼻部腹位發光器(Vn)伸長，呈短帶形，其上端和Dn接觸，下端沿眼眶前下方向後側伸達瞳孔前緣下方；鰓蓋位發光器(Op) 2個，Op1小，位於口角後方；鰓被架位發光器 (Br)3個；體部發光器較頭部小，胸鰭上方發光器(PLO)在側線和胸鰭基間，稍近側線，其後下方發光鱗很大，約占PLO和胸鰭基間距的3/5-4/5；胸鰭下方發光器(PVO)2個，呈斜線排列；胸部發光器(PO)5個，PO4位置升高，腹鰭上位發光器(VLO)離側線較腹鰭基近得多，位於側線下方3倍VLO直徑處；腹部發光器(VO) 5個，,VO2和 VO3位置逐漸升高至和VO1三者成斜直線；臀鰭上方發光器(SAO)3個幾成直線排列，SAO1位於VO5的稍上後方，SAO2離SAO1較SAO3稍近，SAO3鄰近側線下方1倍SAO直徑處；臀鰭前部發光器(AOa )7個，呈弧狀排列，AOa 1位置升高，稍低於SAO2，最後1個AOa 位置亦升高；體後側位發光器(Pol)1個，Pol和SAO3同處1個水平位置；臀鰭後部發光器(AOp)5個，AOp1在臀鰭基末端上方或稍後上方；尾鰭前位發光器(Prc)４個，亦成均勻弧線排列，Prc4在側線下方3倍Prc4直徑處。

Diaphus lucidus, the spotlight lanternfish, is a species of lanternfish found worldwide.

off Banquereau Bank to Brazil with isolated specimens to Argentina

oceanic and mesopelagic, found between 425-750 m during the day and between 40-550 m at night (most abundant below 200 m at night)

nektonic

Known from seamounts and knolls