Hymenocephalus gracilis Gilbert & Hubbs, 1920
Hymenogadus gracilis, also known as the Graceful grenadier is a species of rattail fish. It is found at depths of 160–345 m (525–1,132 ft) in tropical and subtropical seas worldwide. This is one of the smallest of the rattails, growing to no more than 13 cm (5.1 in) in length. It is a slender fish with a large mouth, with rows of very small teeth, positioned in the underside of the skull. There is a short, thin chin barbel. It is more strikingly marked than most rattails, with bold black streaks on the head and black and silver barring over most of the body. There is a long bioluminescent organ with two lenses underneath the rear end of the body.
- Schwarzhans W (2014). "Head and otolith morphology of the genera Hymenocephalus, Hymenogadus and Spicomacrurus (Macrouridae), with the description of three new species". Zootaxa. 3888 (1): 1–73. doi:10.11646/zootaxa.3888.1.1.
- Chiou, M.L.; Shao, K.T. & Iwamoto, T. (2004). "A new species, Caelorinchus sheni, and 19 new records of grenadiers (Pisces: Gadiformes: Macrouridae) from Taiwan" (PDF). Zoological Studies. 43 (1): 35–50. Archived from the original (PDF) on 2005-11-05.
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