- Classification
- ACTINOPTERYGII
- GADIFORMES
- MACROURIDAE
- Hymenogadus
Genus Hymenogadus
Summary:
A genus found worldwide with 2 known species, found mostly in tropical and warm temperate seas.
Diagnosis. Branchiostegal rays 7. Head large, cavernous, cylindrical in cross-section and not strongly laterally compressed, covered by thin or membranous skin, tip of snout formed by thin, weak, laterally flattened mesial extension of nasal bones. Mouth large, sub-terminal to almost terminal. Gill openings and outer gill slit wide; rakers numerous, usually more than 16 total on the inner series of first arch. First dorsal fin with a weakly serrate spinous long second ray with serrations more developed near tip of fin. Anus usually immediately before anal fin origin. Striae, consisting of fine parallel black lines over silvery ground, on isthmus, shoulder girdle and chest. Light organ tubular with two lens-like windows, one before pelvic fin bases, the other round or oblate in outline and situated before anus. Scales large, deciduous, with short, fine spinules (obsolete in some species). Retia mirablia and gas glands 2. (Iwamoto et al. 2011; McMillan & Iwamoto 2014).
Diagnosis. Branchiostegal rays 7. Head large, cavernous, cylindrical in cross-section and not strongly laterally compressed, covered by thin or membranous skin, tip of snout formed by thin, weak, laterally flattened mesial extension of nasal bones. Mouth large, sub-terminal to almost terminal. Gill openings and outer gill slit wide; rakers numerous, usually more than 16 total on the inner series of first arch. First dorsal fin with a weakly serrate spinous long second ray with serrations more developed near tip of fin. Anus usually immediately before anal fin origin. Striae, consisting of fine parallel black lines over silvery ground, on isthmus, shoulder girdle and chest. Light organ tubular with two lens-like windows, one before pelvic fin bases, the other round or oblate in outline and situated before anus. Scales large, deciduous, with short, fine spinules (obsolete in some species). Retia mirablia and gas glands 2. (Iwamoto et al. 2011; McMillan & Iwamoto 2014).
Author: Bray, D.J. 2017
Cite this page as:
Bray, D.J. 2017, Hymenogadus in Fishes of Australia, accessed 17 Apr 2024, https://fishesofaustralia.net.au/Home/genus/1725
References
Iwamoto, T., Shao, K.-T. & Ho, H.-C. 2011. Elevation of Spicomacrurus (Gadiformes: Macrouridae) to generic status, with descriptions of two new species from the southwestern Pacific. Bulletin of Marine Science 87(3): 513–530.
McMillan, P. & T. Iwamoto. 2014. Descriptions of four species of grenadier fishes of the genera Hymenocephalus and Hymenogadus (Teleostei, Gadiformes, Macrouridae) from the New Zealand region and Tasman Sea, including two new species of Hymenocephalus. Zootaxa 3856(1): 117-134.
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): 001–073.