Caulophryne
| Caulophryne | |
|---|---|
| |
| Caulophryne pelagica | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Lophiiformes |
| Family: | Caulophrynidae |
| Genus: | Caulophryne Goode & T. H. Bean, 1896 |
| Type species | |
| Caulophryne jordani Goode & T. H. Bean, 1896
| |
| Synonyms | |
Caulophryne is a genus of marine ray-finned fishes belonging to the family Caulophrynidae, the fanfins or hairy anglerfishes. These fishes are found throughout the non-polar oceans of the world.
Taxonomy
[edit]Caulophryne was first proposed as monospecific genus in 1896 by the American ichthyologists George Brown Goode and Tarleton Hoffman Bean when the described Caulophryne jordani.[1] The holotype of C. jordani was collected from the Gulf Stream off Long Island, New York at 39°27'N, 71°15'W, Albatross station 2747 from a depth between 0 and 1,276 fathoms (0 and 7,656 ft; 0 and 2,334 m).[2] Caulophryne and Robia are the two genera making up the family Caulophrynidae. The 5th edition of Fishes of the World classifies the Caulophrynidae within the suborder Ceratioidei of the order Lophiiformes, the anglerfishes.[3]
Etymology
[edit]Caulophryne is a combination of caulis, which mean" stem", an allusion to the stem-like base of the illicium, with phryne, meaning "toad", a suffix commonly used in the names of anglerfish genera. Its use may date as far back as Aristotle and Cicero, who referred to anglerfishes as “fishing-frogs” and “sea-frogs,” respectively, possibly because of their resemblance to frogs and toads.[4]
Species
[edit]Caulophryne currently has four recognized species classified within it:[5]
| Species | Image |
|---|---|
| Caulophryne bacescui Mihai-Bardan, 1982 | |
| Caulophryne jordani Goode & T. H. Bean, 1896 (Fanfin angler) | 
|
| Caulophryne pelagica A. B. Brauer, 1902 |  |
| Caulophryne polynema Regan, 1930 (Hairy angler) | 
|
Characteristics
[edit]Caulophryne fanfins have a high degree of sexual dimorphism. The females have short, round bodies with large mouths. The lower jaw reaches back past the base of the pectoral fin. The teeth in the jaws are thin, backwards curving and depressible. They have highly elongated dorsal and anal fins, with the soft rays of these fins resembling long threads. There are 8 fin rays in the caudal fin. They do not have pelvic fins. The sensory cells of the lateral line system are at the tips of the filamentous rays of the dorsal and anal fins. They have a simple esca, or lure, which lacks a bulb but which may have filaments or appendages. The skin is naked and they do not have any dermal spines. The males are much smaller than the females and have more elongated bodies. They have large eyes and large nostrils, with large olfactory receptors. They have no teeth in the jaws, although there are tooth-like structures on the jaw bones which are used to attach to the larger female. The male do not have elongated dorsal and anal fins but so have large pectoral fins.[6] The juveniles have pelvic fins that are lost when they metamorphose into adults, although the relict pelvic bones are retained.[3] This genus differs from Robia in their markedly shorter illicium which measures 130 mm (5.1 in) as opposed to 270 mm (11 in) in Robia. The two genera also differ by the count and length of the fin rays in the dorsal and anal fins, in this genus there are between 14 and 22 rays in the dorsal fin with the longest ray having its length equivalent to 70% of the standard length and in the anal fin there are between 12 and 19 fin rays with the longest having its length equivalent to 60% of the standard length. In Robia there are 6 rays in the dorsal fin, the longest is 65% of the standard length, and 5 rays in the anal fin with the longest being 40% of the standard length.[7] The largest species in the genus is C. polynema with a maximum published total length of 21 cm (8.3 in).[5]
Distribution and habitat
[edit]Caulophryne fanfins are found in the Atlantic, Indian and Pacific Oceans where they live in the bathypelagic zone.[8]
Biology
[edit]Caulophryne fanfins are predators on other fishes. They reproduce by means of pelagic eggs which hatch into pelagic larvae. The short, rounded larvae have swollen skin and well-developed pectoral and pelvic fins, the pelvic fins being lost as they metamorphose. Both larval males and females have a basic illicium. Metamorphosis starts at a standard length of 8 to 10 mm (0.31 to 0.39 in).[6] The large, well-developed eyes and olfactory apparatus of the metamorphosed males are used to detect and home in on a species specific chemical released by the female to attract males. When the male finds a female he bites her and the tissue and circulatory systems of the pair fuse, he becomes a sexual parasite on the female and is nourished by the female through shared blood. For the remainder of his life he is attached to the female and fertilises her eggs.[9]
References
[edit]- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Caulophrynidae". Catalog of Fishes. California Academy of Sciences. Retrieved 21 June 2024.
- ^ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Caulophryne". Catalog of Fishes. California Academy of Sciences. Retrieved 21 June 2024.
- ^ a b Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 508–518. doi:10.1002/9781119174844. ISBN 978-1-118-34233-6. LCCN 2015037522. OCLC 951899884. OL 25909650M.
- ^ Christopher Scharpf (3 June 2024). "Order LOPHIIFORMES (part 2): Families CAULOPHRYNIDAE, NEOCERATIIDAE, MELANOCETIDAE, HIMANTOLOPHIDAE, DICERATIIDAE, ONEIRODIDAE, THAUMATICHTHYIDAE, CENTROPHRYNIDAE, CERATIIDAE, GIGANTACTINIDAE and LINOPHRYNIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. Retrieved 21 June 2024.
- ^ a b Froese, Rainer; Pauly, Daniel (eds.). "Species in genus Caulophryne". FishBase. February 2024 version.
- ^ a b Dianne J. Bray. "Fanfin Anglers, CAULOPHRYNIDAE". Fishes of Australia. Museums Victoria. Retrieved 20 June 2024.
- ^ Mincarone, Michael; Afonso, Gabriel; Di Dario, Fabio; et al. (2021). "Deep-sea anglerfishes (Lophiiformes: Ceratioidei) from off northeastern Brazil, with remarks on the ceratioids reported from the Brazilian Exclusive Economic Zone". Neotropical Ichthyology. 19 (2): e200151. doi:10.1590/1982-0224-2020-0151.
- ^ Theodore W. Pietsch (1979). "Systematics and distribution of ceratioid anglerfishes of the family Caulophrynidae with the description of a new genus and species from the Banda Sea". Contributions in Science. 310: 1–25. doi:10.5962/p.241256.
- ^ "A blind date in the deep sea: First-ever observations of a living anglerfish, a female with her tiny mate, coupled for life". UWNews. University of Washington. 22 March 2018. Retrieved 20 June 2024.