New Zealand lanternshark
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| New Zealand lanternshark | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | Squaliformes |
| Family: | Etmopteridae |
| Genus: | Etmopterus |
| Species: | E. baxteri |
| Binomial name | |
| Etmopterus baxteri Garrick, 1957 | |
 | |
| Distribution | |
The New Zealand lanternshark (Etmopterus baxteri) is a shark of the family Etmopteridae mainly found off the coast of New Zealand.[1] It can also be found in the Southern areas of Australia and Africa, inhabiting water depths between 500-1500m.[2] These sharks can be commonly known as Baxter's dogfish and giant lantern shark.[2] According to the New Zealand Threat Classification System (NZTCS), this species conservation status is considered non-threatened.[3]
Diet
[edit]These sharks mainly feed on teleost fish, cephalopods, and occasionally decapod crustaceans.[4]
Physical traits
[edit]They can reach lengths up to 70-88 cm (about 2.89 ft) and achieve maturity by growing to certain sizes.[5] The females mature at 63 cm and males at 54 cm.[5] Being oviparous they can produce 6-16 pups each reproductive cycle.[5]
These sharks are a dark brown or black color with an even darker underbelly and markers for the caudal and pelvic fins.[2] Due to these darker markings the pelvic fin marking can be seen stretching from the base of the fin to the flank as well as a small triangular-like split near the rear.[6] Their snout and build are short[2] and their eyes are large.[5] The exterior appears rough because of the varying placement of the dermal denticles that can appear almost anywhere except on the dorsal fins.[2] They have two dorsal fins with the second fin being the larger and longer of the two.[5] This second fin also contains a second spine that curves and becomes more curved throughout their life.[6]
Teeth structure
[edit]The tooth structure of these sharks can help distinguish them from other sharks as well as each other.[5] While the lower jaw of teeth shows no differences between sexes, the upper jaw does.[5] Females have been shown to have lanceolate central cusps to support their teeth.[5] Males only have central cusps in a narrow structure.[5]
Species similarities
[edit]Due to some similar morphological traits, the New Zealand Lantern shark can often be confused with the Southern Lantern shark and are thought to be connected to one another.[6] The largest piece of evidence for this connection is that both sharks have dermal denticles that are consistently conical-cusped and are randomly distributed.[6] Other evidence includes having a similar curved spine on juvenile's dorsal fin and flank markings.[6] Despite all the similarities, The Southern Lantern shark is mainly located off the South American coast as opposed to the New Zealand coast.[6]
References
[edit]- ^ Froese, Rainer; Pauly, Daniel (eds.). "Etmopterus baxteri". FishBase. June 2017 version.
- ^ a b c d e McMillan, P.; Francis, M.; James, G.; Paul, L.; Marriott, P.; Mackay, E.; Wood, B.; Griggs, L.; Sui, H. (2011). "New Zealand fishes. Volume 1: A field guide to common species caught by bottom and midwater fishing". New Zealand Aquatic Environment and Biodiversity Report No. 68. No. Report No. 68. Wellington: Ministry of Fisheries. p. 67. ISSN 1176-9440.
- ^ Duffy, Clinton; Francis, Malcolm; Dunn, Matthew; Finucci, Brit; Ford, Richard; Hitchmough, Rod; Rolfe, Jeremy (June 2018). "Conservation status of New Zealand chondrichthyans (chimaeras, sharks and rays), 2016". ReserchGate (PDF). New Zealand: Publishing Team, Department of Conservation. p. 10. Archived from the original on 12 December 2018.
- ^ CORTES, E (October 1999). "Standardized diet compositions and trophic levels of sharks". ICES Journal of Marine Science. 56 (5): 707–717. Bibcode:1999ICJMS..56..707C. doi:10.1006/jmsc.1999.0489. ISSN 1054-3139.
{{cite journal}}: CS1 maint: date and year (link) - ^ a b c d e f g h i Straube, Nicolas; Schliewen, Ulrich; Kriwet, Jürgen (2008-06-01). "Dental structure of the Giant lantern shark Etmopterus baxteri (Chondrichthyes: Squaliformes) and its taxonomic implications". Environmental Biology of Fishes. 82 (2): 133–141. Bibcode:2008EnvBF..82..133S. doi:10.1007/s10641-007-9264-z. ISSN 1573-5133. S2CID 22223371.
- ^ a b c d e f Tachikawa, Hiroyuki; Taniuchi, Toru; Arai, Ryoichi (December 22, 1989). "Etmopterus baxteri, a Junior Synonym of E. granulosus (Elasmobranchii, Squalidae)" (PDF). kahaku. p. 235-241.
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