Polyamblyodon gibbosum

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Polyamblyodon gibbosum
Polyamblyodon gibbosum.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Spariformes
Family: Sparidae
Genus: Polyamblyodon
Species:
P. gibbosum
Binomial name
Polyamblyodon gibbosum
(Pellegrin, 1914)
Synonyms [2]
  • Pachymetopon gibbosus Pellegrin, 1914
  • Polyamblyodon cristiceps J. L. B. Smith, 1940

Polyamblyodon gibbosum, the knife-back seabream or cristie, is a species of marine ray-finned fish belonging to the family Sparidae, which includes the seabreams and porgies. This species is endemic to the southwestern Indian Ocean.

Contents

Taxonomy and etymology

Polyamblyodon gibbosum was first formally described as Pachymetopon gibbosus in 1914 by the French ichthyologist Jacques Pellegrin with its type locality given as Fort-Dauphin in Madagascar. [3] The genus Polyamblyodon is placed in the family Sparidae within the order Spariformes by the 5th edition of Fishes of the World . [4] Some authorities classify this genus in the subfamily Pagellinae, [5] but the 5th edition of Fishes of the World does not recognise subfamilies within the Sparidae. [4]

The generic name Polyamblyodon is Greek for "many blunt tooth," while the specific name gibbosum is Latin for "humpbacked", an allusion to the hump in front of the dorsal fin, largest in adults. [6]

Description

Polyamblyodon gibbosum has a dorsal fin which is supported by 11 spines and 13 soft rays while there are 3 spines and 10 or 11 soft rays. It has a compressed, rather deep body which becomes more ovoid with age. The depth of the body fits into its standard length between 2 and 2.3 times. It has a steep dorsal profile to its head, growing steeper with age. It is moderately concave between the upper lip and the acute nape, and then it is convex to the origin of the dorsal fin origin. The upper body is grey-blue to dusky with the lateral line scales being darker and very noticeable, the body is lighter in colour below the lateral line. The rear margin of the gill cover is darl with the fins being lighter in colour except that the tips of the pelvic fins, pectoral fins and caudal fin lobes are rather dusky. [7] The maximum published total length of this species is 60 cm (24 in), although 35 cm (14 in) is more typical. [2]

Distribution and habitat

Polyamblyodon gibbosum is endemic to the southwestern Indian Ocean where it is found around southern Madagascar and from Beira, Mozambique in Mozambique to Port Edward in KwaZulu-Natal. This species is found at depths between 2 and 25 m (6 ft 7 in and 82 ft 0 in) over offshore reefs. [1]

Biology

Polyamblyodon gibbosum is found in shoals in the middle of the water column where it feeds on zooplankton. They are often seen gathering near boats close to the surface. [8]

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References

  1. 1 2 Mann, B.Q.; Buxton, C.D.; Russell, B.; et al. (2014). "Polyamblyodon gibbosum". IUCN Red List of Threatened Species . 2014: e.T170196A1291075. doi: 10.2305/IUCN.UK.2014-3.RLTS.T170196A1291075.en . Retrieved 9 February 2024.
  2. 1 2 Froese, Rainer; Pauly, Daniel (eds.) (2023). "Polyamblyodon gibbosum" in FishBase. October 2023 version.
  3. ↑ Eschmeyer, William N.; Fricke, Ron & van der Laan, Richard (eds.). "Species in the genus Polyamblyodon". Catalog of Fishes . California Academy of Sciences . Retrieved 9 February 2024.
  4. 1 2 Nelson, J.S.; Grande, T.C.; Wilson, M.V.H. (2016). Fishes of the World (5th ed.). Hoboken, NJ: John Wiley & Sons. pp. 502–506. doi:10.1002/9781119174844. ISBN   978-1-118-34233-6. LCCN   2015037522. OCLC   951899884. OL   25909650M.
  5. ↑ Parenti, P. (2019). "An annotated checklist of the fishes of the family Sparidae". FishTaxa. 4 (2): 47–98.
  6. ↑ Christopher Scharpf (12 January 2024). "Order ACANTHURIFORMES (part 6): Families GERREIDAE, LETHRINIDAE, NEMIPTERIDAE and SPARIDAE". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf. Retrieved 9 February 2024.
  7. ↑ Yukio Iwatsuki and Phillip C Heemstra (2022). "Family Sparidae". In Phillip C Heemstra; Elaine Heemstra; David A Ebert; Wouter Holleman; and John E Randall (eds.). Coastal Fishes of the Western Indian Ocean (PDF). Vol. 3. South African Institute for Aquatic Biodiversity. pp. 284–315. ISBN   978-1-990951-32-9.
  8. ↑ "Polyamblyodon gibbosum Jacques Pellegrin, 1914". Red List of South African Species. South African National Biodiversity Institute. Retrieved 9 February 2024.
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