Acentrophryne longidens

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Acentrophryne longidens
Acentrophryne longidens 2.png
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Lophiiformes
Family: Linophrynidae
Genus: Acentrophryne
Species:
A. longidens
Binomial name
Acentrophryne longidens
Regan, 1926

Acentrophryne longidens is a species of marine ray-finned fish belonging to the family Linophryidae, the leftvents, a family of deep sea anglerfishes. This species is only known from the eastern Pacific Ocean off the coast of Costa Rica and Panama.

Contents

Taxonomy

Acentrophryne longidens was first formally described in 1926 by the English ichthyologist Charles Tate Regan with its type locality given as 7°30'N, 79°19'W in the Gulf of Panama from a depth of around 1,250 m (4,100 ft), the holotype being collected by the Danish research vessel Dana . [2] When Regan described this species he proposed that it be placed in the new monospecific genus Acentrophryne , making it the type species of that genus by monotypy. [3] The 5th edition of Fishes of the World classifies this genus in the family Linophrynidae, within the suborder Ceratioidei, the deep sea anglerfishes, of the anglerfish order Lophiiformes. [4]

Evolutionary history

Acentrophryne longidens is one of two species in the genus Acentophryne. This genus is known from the fossil record, as a single specimen was found in 1977 from a Miocene diatomaceous deposit in the Puente Hills of Southern California. This was initially tentatively identified as being 'this species but its identity is now left open as Acentrophryne sp. as it was somewhat intermediate between this species and Acentrophryne dolichonema . Acentrophryne leftvents are endemic to the eastern Pacific and are adapted to low oxygen environments. The fossil specimen from California suggests that this genus originated in the Miocene and that hypoxic environments were more widespread in the eastern Pacific, as these reduced the genus underwent a contraction in its distribution and subsquent allopatric speciation. [5]

Etymology

Acentrophryne longidens belongs to the genus Acentophryne, an name that prefixes a, meaning "without", to kentron, meaning "spine", a reference to the lack of a spine on the preoperculum. This is then suffixed with phryne, which means "toad", 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. The specific name, longidens, means "long teeth" an allusion to hte long and robust teeth in both jaws of this species. [6]

Description

Acentrophryne longidens has 3 soft rays in both the dorsal and anal fin. This species is known only from metamorphosed females and these are distinguished from the metamorphosed females of A. dolichonema by the possession of a shorterer appendage on the tip of the esca, this having a length equivalent to 2.3-2.5% of the standard length as opposed to 27.6% to 35.7% in A. dolichonema, and a shorter illicium, which has a length euqivalent to between 35.7% and 54,9% of the standard length conmpared to 63.6% to 70.5% in A. dolichonema. They also have a broader head and more fin rays in the pectoral fin, 18 or 19 compared to 16 for A. dolichonema. This species has a maximum published standrad length of 5 cm (2.0 in). [7]

Distribution and habitat

Acentrophryne longidens is known from two specimens which were collected from two separate localities in the Eastern Pacific Ocean, in the Gulf of Panama and south of Cabo Blanco in Costa Rica. Both specimens were collected at depths between 1,250 and 1,280 m (4,100 and 4,200 ft). [1]

Related Research Articles

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<span class="mw-page-title-main">Fanfin</span> Family of fishes

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<i>Tyrannophryne</i> Monotypic genus of fish

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<i>Acentrophryne</i> Genus of fishes

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<i>Borophryne</i> Species of fish

Borophryne apogon, the netdevil, or greedy seadevil, is a species of leftvent anglerfish known today from the waters of the eastern Pacific Ocean off the Central American coast. It is found at depths down to around 1,750 m (5,700 ft). This species grows to a length of 8.3 centimetres (3.3 in) TL. A fossil specimen of this species has been found in the Los Angeles Basin dating back to the Late Miocene, some eight million years ago.

<i>Chaenophryne</i> Genus of fishes

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Ctenochirichthys is a monospecific genus of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. The only species in the genus is Ctenochirichthys longimanus is known only from two locations, on in the Atlantic Ocean and the other in the Western Pacific Ocean.

<i>Danaphryne</i> Monotypic genus of fish

Danaphryne is a monospecific genus of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. The only species in the genus is Danaphryne nigrifilis which is found in the tropical and temperate regions of all of the world's oceans.

<i>Dermatias</i> Monotypic genus of fish

Dermatias is a monospecific genus of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. The only species in the genus is Dermatias platynogaster which is known from 4 metamorphosed female specimens collected from 3 widley sparated localities in the Western Pacific Ocean.

Dolopichthys is a genus of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. These predatory, deep-sea fishes are found in the tropical and subtropical oceans around the world.

<i>Oneirodes</i> Genus of fishes

Oneirodes is a genus of is a genus of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. These predatory, deep-sea fishes are found around the world. This is the type genus, and the most speciose genus, of the family Oneirodidae. They are sexually dimorphic but, like most taxa within their family, the small males are free living and are not sexual parasites on the larger females. Only the females are used to identify the species in this genus as no species specific charaxcters have been found for males.

<i>Puck pinnata</i> Species of fish

Puck pinnata, the mischievous dreamer, is a species of marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep-sea anglerfishes. This species is known from four metamorphosed female specimens each collected from four separate locations, three in the Pacific Ocean and one in the Atlantic Ocean. As with all other species in the family, it is a pelagic, deep-water fish that is a member of the abyssal ecosystem. It is the only known species in the monospecific genus Puck.

Caulophryne bacescui of marine ray-finned fishes belonging to the family Caulophrynidae, the fanfins or hairy anglerfishes. It is known from a single specimen collected from the Eastern Pacific Ocean.

<i>Ceratias uranoscopus</i> Species of fish

Ceratias uranoscopus, the stargazing seadevil, is a species of marine ray-finned fish belonging to the family Ceratiidae, the warty sea devils. The fish is both bathypelagic and mesopelagic and can typically be found at depths ranging from 500 to 1,000 metres. It is endemic to tropical waters and can be found in the Atlantic, Pacific, and Indian Oceans.

<i>Acentrophryne dolichonema</i> Species of angler fish

Acentrophryne dolichonema is a species of marine ray-finned fish belonging to the family Linophrynidae, the leftvents, a family of deep sea anglerfishes. This species is only known from the eastern Pacific Ocean off the coast of Peru.

Chaenophryne melanorhabdus is a species marine ray-finned fish belonging to the family Oneirodidae, the dreamers, a family of deep sea anglerfishes. This predatory, deep-sea fish is found in the Pacific Ocean. Like other deep-sea anglerfishes dreamers are sexually dimorphic with the matamorphosed females dwarfing the metamorphosed males, the males are not sexual parasites.

References

  1. 1 2 Carpenter, K.E. & Robertson, R. (2019). "Acentrophryne longidens". IUCN Red List of Threatened Species . 2019: e.T140156007A140323003. doi: 10.2305/IUCN.UK.2019-3.RLTS.T140156007A140323003.en . Retrieved 21 August 2024.
  2. Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Acentrophryne". Catalog of Fishes . California Academy of Sciences . Retrieved 21 August 2024.
  3. Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Genera in the family Linophrynidae". Catalog of Fishes . California Academy of Sciences . Retrieved 21 August 2024.
  4. 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.
  5. Giorgio Carnevale; Theordore W. Pietsch (12 June 2009). "The deep-sea anglerfish genus Acentrophryne (Teleostei, Ceratioidei, Linophrynidae) in the Miocene of California" (PDF). Journal of Vertebrate Paleontology . 29 (2): 372–378. doi:10.1671/039.029.0232. ISSN   0272-4634. Wikidata   Q114229338.
  6. Christopher Scharpf (21 August 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.
  7. Froese, Rainer; Pauly, Daniel (eds.) (2024). "Acentrophryne longidens" in FishBase . June 2024 version.