Hemiscyllium henryi

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Hemiscyllium henryi
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Subdivision: Selachimorpha
Order: Orectolobiformes
Family: Hemiscylliidae
Genus: Hemiscyllium
Species:
H. henryi
Binomial name
Hemiscyllium henryi

The Triton epaulette shark (Hemiscyllium henryi) is a species of bamboo shark in the genus Hemiscyllium , that is composed of nine morphologically similar, yet distinct, sharks that are geographically restricted to New Guinea and northern Australia. Hemiscylliidae are small nocturnal sharks aptly named "walking sharks" who exhibit a "crawling" movement while foraging on the ocean floor for fish and benthic invertebrates. [3] [4]

Contents

Morphology

H. henryi habitat. Western New Guinea Indonesia Maluku-Western New Guinea topography location map.png
H. henryi habitat. Western New Guinea

These small slender sharks are characterized by nasoral and perioral grooves, short barbels, a small transverse mouth below the eyes, two similar-sized dorsal fins and long slender tail. They are typically pale gray-brown with a white ventral surface. Individuals of the genus Hemiscyllium henryi are distinguished by their unique colour pattern of a combination of small scattered spots on the head, body, and fins with 13 to 18 spots on the interorbital/dorsal snout region and 6-28 spots on the dorsal surface of their pectoral fins. Hemiscyllium henryi have an irregular shaped ocellus (typically a merged double-ocellus), surrounded by a poorly defined white halo marking in the middle of their side just behind their head. [3]

The lack of small dark spots on their dorsal fins sets them apart from other Hemiscylliidae. The males and the unsexed sharks grow to an average of 78.3 cm in length. The females grow to an average of 81.5 cm in length. In three preserved specimens collected in the Triton Bay region, the number of vertebrae was found to range from 191 to 194. [3]

Reproduction

Hemiscyllium species are oviparous, benthic reproducers. They deposit their eggs on or near the sea bed. [3]

Sexual dimorphism

Male hemiscyllids have paired claspers that are used to grasp the female during copulation. These distinctive organs vary in size within the species although insufficient data due to small sample sizes have not been found to show a variation in claspers between species. Until the onset of maturation, juvenile sharks possess small underdeveloped claspers. Enlargement occurs rapidly as intermediate sizes have not yet been observed. Mature males have an inner clasper length of 6.7–11.9% TL and outer clasper length of 5.5–9.5% TL (n=17). Immature males have an inner clasper length of 2.8–4.5% TL and an outer clasper length of 0.9-2.0% TL (n=13). [3] [4]

Habitat and ecology

Hemiscyllium henryi are marine, reef-associated sharks that are typically found on coral reefs, rubble, or seagrass flats. The depth range where they are typically found is 3 - 30m showcasing an ability to remain in shallow water as well as swim to substantial depths. Their observed climate zone is tropical. Hemiscyllium henryi can mostly be seen resting during the day as they are nocturnal and are occasionally observed slowly swimming or 'walking' with their pectoral and pelvic fins in search for food or shelter. Hemiscyllids primarily consume crustaceans, cephalopods, shelled mollusks, and small bottom fish found along the sea floor and sheltered in table coral or other rocky features. [4] [5]

Etymology

The shark is named in honor of underwater photographer Wolcott Henry, who has supported Conservation International's marine initiatives, which includes the taxonomy of western New Guinea fishes. [6]

Distribution

H. henryi have been observed and collected from western New Guinea (West Papua Province, Indonesia) in the southern Bird's Head region. They were also observed at Triton Bay and Selat Iris, a narrow channel between the mainland and Aiduma Island and near the southwestern tip of the Bomberai Peninsula - 135 km west of Triton Bay. Further surveys may show that H. Henryi have a broader range in southern West Papua. [7]

Conservation status

This species was recently described in 2008 and their conservation status is listed as vulnerable by the IUCN. Due to their limited range H. henryi would be extremely susceptible to depletion should attempts be made to harvest them for trade or food. [7]

Relationship with humans

Bamboo sharks are not dangerous to humans. Additionally, bamboo sharks are one of the few species of sharks kept in home aquariums. [8]

Related Research Articles

<span class="mw-page-title-main">Carpet shark</span> Order of sharks

Carpet sharks are sharks classified in the order Orectolobiformes. Sometimes the common name "carpet shark" is used interchangeably with "wobbegong", which is the common name of sharks in the family Orectolobidae. Carpet sharks have five gill slits, two spineless dorsal fins, and a small mouth that does not extend past the eyes. Many species have barbels.

<span class="mw-page-title-main">Zebra shark</span> Species of carpet sharks

The zebra shark is a species of carpet shark and the sole member of the family Stegostomatidae. It is found throughout the tropical Indo-Pacific, frequenting coral reefs and sandy flats to a depth of 62 m (203 ft). Adult zebra sharks are distinctive in appearance, with five longitudinal ridges on a cylindrical body, a low caudal fin comprising nearly half the total length, and usually a pattern of dark spots on a pale background. Young zebra sharks under 50–90 cm (20–35 in) long have a completely different pattern, consisting of light vertical stripes on a brown background, and lack the ridges. This species attains a length of 2.5 m (8.2 ft).

<span class="mw-page-title-main">Tasselled wobbegong</span> Species of shark

The tasselled wobbegong is a species of carpet shark in the family Orectolobidae and the only member of its genus. It inhabits shallow coral reefs off northern Australia, New Guinea, and adjacent islands. Reaching 1.8 m (5.9 ft) in length, this species has a broad and flattened body and head. Its most distinctive trait is a fringe of branching dermal flaps around its head, which extends onto its chin. The fringe, along with its complex color pattern of small blotches and reticulations, enable it to camouflage itself against the reef environment.

<span class="mw-page-title-main">Hemiscylliidae</span> Family of sharks

The Hemiscylliidae are a family of sharks in the order Orectolobiformes, commonly known as longtail carpet sharks and sometimes as bamboo sharks. They are found in shallow waters of the tropical Indo-Pacific.

<span class="mw-page-title-main">Blind shark</span> Species of shark

The blind shark is one of two species of carpet sharks in the family Brachaeluridae, along with the bluegrey carpetshark. Found along the coast of eastern Australia, this nocturnal, bottom-dwelling species is common in rocky areas and seagrass beds from the intertidal zone to a depth of 140 m (460 ft). It often roams in tidal pools where it may be trapped by the receding tide, and can survive for an extended period out of water.

<span class="mw-page-title-main">Coral catshark</span> Species of shark

The coral catshark is a species of catshark in the family Scyliorhinidae. It is common on shallow coral reefs across the Indo-West Pacific, from Pakistan to New Guinea. Reaching up to 70 cm (28 in) in length, the coral catshark has an extremely slender body, a short head and tail, and two dorsal fins that are angled backwards. It can be identified by the numerous black and white spots on its back, sides, and fins, which often merge to form horizontal bars. Furthermore, adult males have distinctively long and thin claspers.

<span class="mw-page-title-main">Epaulette shark</span> Species of longtailed carpet shark

The epaulette shark is a species of longtailed carpet shark of the family Hemiscylliidae, found in shallow, tropical waters off Australia and New Guinea. The common name of this shark comes from the very large, white-margined black spot behind each pectoral fin, which are reminiscent of military epaulettes. A small species usually under 1 m (3.3 ft) long, the epaulette shark has a slender body with a short head and broad, paddle-shaped paired fins. The caudal peduncle comprises over half the shark's length. Adults are light brown above, with scattered darker spots and indistinct saddles.

<span class="mw-page-title-main">Brownbanded bamboo shark</span> Species of shark

The brownbanded bamboo shark, is a bamboo shark in the family Hemiscylliidae that can be found in the Indo-West Pacific from Japan to northern Australia, between latitudes 34° N and 26° S. It is regularly bred in public aquaria, and is arguably one of the sharks most suited to captivity due to its docile disposition, sedentary nature, and relatively small size. In public aquariums, these fish can live up to 25 years.

<span class="mw-page-title-main">Arabian carpetshark</span> Species of shark

The Arabian carpetshark is a species of carpet shark in the family Hemiscylliidae, inhabiting coral reefs and other shallow coastal habitats from the Persian Gulf to India. Reaching 78 cm (31 in) long, this shark is characterized by a slender, plain brown body, and by two dorsal fins with straight trailing margins and the second smaller but longer-based than the first. The Arabian carpetshark feeds on bony fishes and invertebrates. Reproduction is oviparous with an annual cycle; females deposit egg capsules four at a time and the young hatch after 70–80 days. This small shark is often captured as bycatch but rarely used by humans. It has been assessed as Near Threatened by the International Union for Conservation of Nature (IUCN), as there is increasing fishing pressure and habitat degradation within its range. It does well in aquariums and has been bred in captivity.

<span class="mw-page-title-main">Burmese bamboo shark</span> Species of shark

The Burmese bamboo shark, Chiloscyllium burmensis, is an extremely rare bamboo shark in the family Hemiscylliidae. The first specimen was caught 1963 off the coast from Rangoon in Burma in a depth of 29 – 33 m. This holotype is an adult male, 57 cm long and kept in the National Museum of Natural History, Smithsonian Institution, Washington DC. Later, three more specimens, two males and one female, were recorded 2018 from the Bangladesh Fisheries Development Corporation Fish Landing Center of Cox’s Bazar.

<span class="mw-page-title-main">Indonesian speckled carpetshark</span> Species of shark

The Indonesian speckled carpetshark, Hemiscyllium freycineti, is a species of bamboo shark in the family Hemiscylliidae. It is found in the shallow ocean around the Raja Ampat Islands in West Papua, Indonesia, but was formerly believed to be more widespread. This was due to confusion with H. michaeli, a species described from eastern Papua New Guinea in 2010. Compared to that species, the spots on H. freycineti are smaller, more rounded or slightly elongated in shape, and tend to darken at regular intervals forming 8-9 vertical bars on the body and tail. Furthermore, the large black spot behind the pectoral fin is more clearly defined in H. michaeli than in H. freycineti. Confusingly, some books with illustrations and photos labelled as H. freycineti actually show H. michaeli.

<span class="mw-page-title-main">Papuan epaulette shark</span> Species of shark

The Papuan epaulette shark, Hemiscyllium hallstromi, is a bamboo shark in the family Hemiscylliidae found around southern Papua New Guinea, between latitudes 7° S and 10° S, and longitude 144° E and 146° E. Its length is up to 75 cm.

<span class="mw-page-title-main">Hooded carpetshark</span> Species of shark

The hooded carpetshark is a bamboo shark in the family Hemiscylliidae found around Papua New Guinea, between latitudes 5° S and 10° S, and longitude 144° E and 153° E. Its length is up to 75 cm. Like other longtailed carpetsharks, it can use its strong pectoral fins to walk on land for a short period of time. The hooded carpetshark is heavily wanted in the aquarium trade, the result is making this shark endangered.

<span class="mw-page-title-main">Speckled carpetshark</span> Species of shark

The speckled carpetshark, Hemiscyllium trispeculare, is a bamboo shark in the family Hemiscylliidae found around north and west Australia between latitudes 8° S and 22° S, and longitude 114° E and 152° E. Its length is up to 79 cm, and it inhabits shallow coral reefs. It is also kept in aquaria. The speckled carpetshark is closely related to the epaulette shark

<i>Hemiscyllium</i> Genus of sharks

Hemiscyllium is a genus of sharks in the family Hemiscylliidae.

<i>Hemiscyllium galei</i> Species of shark

Hemiscyllium galei, the Cenderawasih epaulette shark, is a species of bamboo shark in the family Hemiscylliidae. Together with H. henryi, it was only scientifically described in 2008 by Gerald R. Allen and Mark V. Erdmann. At present, H. galei is only known from depths of 2 to 4 metres at reefs in the Cenderawasih Bay in West Papua, Indonesia. The largest known specimen was 56.8 centimetres (22.4 in) long. It can be separated from its relatives by the combination of seven relatively large dark spots along the side of the body, white markings on the edge of its dark dorsal saddles and other scattered white spots on the upper side.

<span class="mw-page-title-main">Leopard epaulette shark</span> Species of bamboo shark

The leopard epaulette shark, also known as the Milne Bay epaulette shark and Michael's epaulette shark, is a species of bamboo shark in the genus Hemiscyllium. It is a tropical shark known from the shallow ocean in the Milne Bay region of eastern Papua New Guinea. The epaulette sharks of this region have long been confused with the Indonesian speckled carpetshark, and it was only in 2010 that H. michaeli was described as a separate species by Gerald R. Allen and Christine L. Dudgeon. It can reach a maximum length of 82 cm. Confusingly, some books with illustrations and photos labelled as H. freycineti actually show H. michaeli.

<i>Hemiscyllium halmahera</i> Species of shark

Hemiscyllium halmahera, or the Halmahera epaulette shark, is a species of bamboo shark from Indonesia. This species is described from two specimens collected near Ternate island in 2013, off the coast of larger Halmahera island. This species is most similar to Hemiscyllium galei, found in West Papua, but looks strikingly different in its pattern of spots. While H. galei has seven large, dark spots on each side of its body, H. halmahera has a brown color with clusters of brown or white spots in polygon configurations all over its body. These small sharks are like other bamboo sharks, in that they use their pectoral fins to "walk" along the ocean floor.

<i>Amblygobius semicinctus</i> Species of fish

Amblygobius semicinctus, the halfbarred goby , is a species of goby from family Gobiidae.

References

  1. VanderWright, W.J.; Allen, G.R.; Derrick, D.; Dudgeon, C.; Erdmann, M.V.; Sianipar, A. (2021). "Hemiscyllium henryi". IUCN Red List of Threatened Species . 2021: e.T195437A198885960. doi: 10.2305/IUCN.UK.2021-2.RLTS.T195437A198885960.en . Retrieved 18 November 2021.
  2. Allen & Erdmann (2008). "Two new species of bamboo sharks (Orectolobiformes: Hemiscylliidae) from Western New Guinea". Aqua (Miradolo Terme). 13 (3–4): 93–108.
  3. 1 2 3 4 5 Allen, G., Erdmann, M.V., White, Dudgeon, C.L., (2013). Hemiscyllium halmahera, A New Species of Bamboo Shark (Hemiscyllidae) From Indonesia. Aqua, International Journal of Ichthyology, 126.
  4. 1 2 3 Allen, G.R., Erdmann, M.V., White, W.T., Fahmi & Dudgeon, C.L. (2016) Review of the bamboo shark genus Hemiscyllium (Orectolobiformes: Hemiscyllidae). Journal of the Ocean Science Foundation, 23, 51–97.
  5. "Hemiscyllium henryi, Triton Epaulette shark". www.fishbase.de. Retrieved 2020-11-11.
  6. Christopher Scharpf & Kenneth J. Lazara (22 September 2018). "Order ORECTOLOBIFORMES (Carpet Sharks)". The ETYFish Project Fish Name Etymology Database. Christopher Scharpf and Kenneth J. Lazara. Retrieved 7 March 2022.
  7. 1 2 "Triton Bay Epaulette Shark, Hemiscyllium henryi information". www.elasmodiver.com. Retrieved 2020-11-11.
  8. Michael, Scott. “Aquarium Fish: The Epaulette Sharks( Hemiscyllium Spp.) – The Perfect Aquarium Sharks.” Reefs.com. 20 July 2020. reefs.com/magazine/aquarium-fish-the-epaulette-sharks-hemiscyllium-spp-the-perfect-aquarium-sharks/. Accessed 2 Nov. 2020.