bio.wikisort.org - Animal The Mexican hornshark (Heterodontus mexicanus ) is a bullhead shark of the family Heterodontidae. This shark is grey-brown in color, with black spots scattered on the fins and body. It has a cylindrical trunk, conical head, and small spiracles behind the eyes. The snout of the Mexican hornshark is very round and blunt. Like all members of the order Heterodontiformes, this shark has fin spines in front of both of its dorsal fins. The first dorsal fin originates before the pectoral fins, while the second dorsal fin originates behind the pelvic fins. The Mexican hornshark reaches a maximum length around 70 cm, but usually reaches between 50 and 60 cm on average. Young hornsharks hatch around 14 cm.[2]
Species of shark
Mexican hornshark
Scientific field drawing
Conservation status
Least Concern
(IUCN 3.1)[1]
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Chondrichthyes
Superorder:
Selachimorpha
Order:
Heterodontiformes
Family:
Heterodontidae
Genus:
Heterodontus
Species:
H. mexicanus
Binomial name
Heterodontus mexicanus L. R. Taylor & Castro-Aguirre, 1972
Range of Mexican bullhead shark (in blue)
Habitat and range
Jaws
Mexican hornsharks are distributed throughout the coast of the Eastern Pacific, mainly around southern Baja California, and possibly as far south as Peru. The rocky bottoms, coral reefs, and sandy areas of the littoral zone create the habitat of this hornshark. The Mexican hornshark can be found at a maximum depth of 50 m, but is usually found down to 20 m.[3]
Behavior
Like all members of the order Heterodontiformes, the Mexican hornshark is oviparous. After an unknown gestation period, the female attaches an unknown number of spiral-shaped egg cases to rocks on the sea floor. The length of the incubation period of these egg cases is also unknown. Not much about the feeding habits of the Mexican hornshark is known, but it most likely feeds on shelled invertebrates. Because of its size, this shark poses no danger to humans.
Conservation
The Mexican hornshark is listed as least concern by the IUCN Red List. This shark is not considered to have commercial value, but it is at risk nonetheless because it is taken as bycatch by fishing operations that use bottom gillnets. Mexican hornsharks caught as bycatch are either discarded or used in fishmeal. If released back into the water, these sharks are hardy enough to survive, but unfortunately many discarded hornsharks are left on beaches to die. Overall, the threat to Mexican hornsharks is considerable, as their range is restricted and they are frequently caught.[1]
References
Pollom, R., Avalos, C., Bizzarro, J., Burgos-Vázquez, M.I., Cevallos, A., González, A., Herman, K., Mejía-Falla, P.A., Morales-Saldaña, J.M., Navia, A.F., Pérez Jiménez, J.C. & Sosa-Nishizaki, O. 2020. Heterodontus mexicanus . The IUCN Red List of Threatened Species 2020: e.T60235A124454650. https://dx.doi.org/10.2305/IUCN.UK.2020-3.RLTS.T60235A124454650.en . Retrieved 11 May 2022 . Godknecht, Alexander J. "Mexican hornshark (Heterodontus mexicanus )" . shark.ch. Compagno, L.J.V. "Mexican hornshark (Heterodontus mexicanus )". Sharks of the World . species-identification.org.
External links
Sharks portal
Extant shark species
Kingdom Animalia
Phylum Chordata
Subphylum Vertebrata
Class Chondrichthyes
Subclass Elasmobranchii
Subdivision Selachii
Order Carcharhiniformes (Ground sharks)
Hemigaleidae (Weasel sharks)
Hemipristis Chaenogaleus
Hooktooth shark (C. macrostoma )
Hemigaleus Paragaleus
Leptochariidae
Leptocharias
Barbeled houndshark (L. smithii )
Proscylliidae (Finback sharks)
Ctenacis Eridacnis Proscyllium
Graceful catshark (P. habereri )
P. venustum
Pseudotriakidae
Gollum
Slender smooth-hound (G. attenuatus )
Pseudotriakis
False catshark (P. microdon )
Sphyrnidae (Hammerhead sharks)
Eusphyra
Winghead shark (E. blochii )
Sphyrna
Triakidae (Houndsharks)
Furgaleus
Whiskery shark (F. macki )
Galeorhinus Gogolia Hemitriakis Hypogaleus Iago Mustelus (Smooth-hounds) Scylliogaleus
Flapnose houndshark (S. quecketti )
Triakis
Carcharhinidae
Large family listed below
Scyliorhinidae
Large family listed below
Family Carcharhinidae (Requiem sharks)
Carcharhinus Galeocerdo Glyphis (River sharks) Isogomphodon Lamiopsis
Broadfin shark (L. temminckii )
Loxodon Nasolamia Negaprion Prionace Rhizoprionodon Scoliodon
Spadenose shark (S. laticaudus )
Triaenodon
Whitetip reef shark (T. obesus )
Family Scyliorhinidae (Catsharks)
Apristurus Asymbolus
Australian spotted catshark (A. analis )
A. funebris
Western spotted catshark (A. occiduus )
Pale spotted catshark (A. pallidus )
A. parvus
A. rubiginosus
Variegated catshark (A. submaculatus )
Gulf catshark (A. vincenti )
Atelomycterus
A. baliensis
Banded sand catshark (A. fasciatus )
Australian marbled catshark (A. macleayi )
Coral catshark (A. marmoratus )
Aulohalaelurus Cephaloscyllium
Whitefin swellshark (C. albipinnum )
Circle-blotch pygmy swellshark (C. circulopullum )
Cook's swellshark (C. cooki )
Reticulated swellshark (C. fasciatum )
Formosa swellshark (C. formosanum )
Australian reticulate swellshark (C. hicosellum )
Draughtsboard shark (C. isabellum )
Australian swellshark (C. laticeps )
Spotted swellshark (C. maculatum )
Leopard-spotted swellshark (C. pardelotum )
Painted swellshark (C. pictum )
Sarawak pygmy swellshark (C. sarawakensis )
Flagtail swellshark (C. signourum )
Indian swellshark (C. silasi )
Speckled swellshark (C. speccum )
Balloon shark (C. sufflans )
Blotchy swellshark (C. umbratile )
Saddled swellshark (C. variegatum )
Swellshark (C. ventriosum )
Narrowbar swellshark (C. zebrum )
Cephalurus Figaro
Australian sawtail catshark (F. boardmani )
Northern sawtail catshark (F. striatus )
Galeus Halaelurus Haploblepharus
Puffadder shyshark (H. edwardsii )
Brown shyshark (H. fuscus )
Natal shyshark (H. kistnasamyi )
Dark shyshark (H. pictus )
Holohalaelurus
H. favus
H. grennian
Crying izak (H. melanostigma )
African spotted catshark (H. punctatus )
Izak catshark (H. regani )
Parmaturus Pentanchus Poroderma
Pyjama catshark (P. africanum )
Leopard catshark (P. pantherinum )
Schroederichthys Scyliorhinus
Order Echinorhiniformes (Bramble sharks)
Order Heterodontiformes (Bullhead sharks)
Order Hexanchiformes
Chlamydoselachidae
Chlamydoselachus
Frilled shark (C. anguineus )
Southern African frilled shark (C. africana )
Hexanchidae (Cow sharks)
Heptranchias
Sharpnose sevengill shark (H. perlo )
Hexanchus
Bluntnose sixgill shark (H. griseus )
Bigeyed sixgill shark (H. nakamurai )
Notorynchus
Order Lamniformes (Mackerel sharks)
Alopiidae
Alopias (Thresher sharks)
Cetorhinidae
Cetorhinus
Basking shark (C. maximus )
Lamnidae
Carcharodon
Great white shark (C. carcharias )
Isurus Lamna
Megachasmidae
Megachasma
Megamouth shark (M. pelagios )
Mitsukurinidae
Odontaspididae
Carcharias
Grey nurse shark (C. taurus )
Indian sand tiger (C. tricuspidatus )
Odontaspis
Pseudocarchariidae
Pseudocarcharias
Crocodile shark (P. kamoharai )
Order Orectolobiformes (Carpet sharks)
Brachaeluridae
Brachaelurus Heteroscyllium
Bluegrey carpetshark (H. colcloughi )
Ginglymostomatidae (Nurse sharks)
Hemiscylliidae (Bamboo sharks)
Chiloscyllium Hemiscyllium
Orectolobidae (Wobbegongs)
Eucrossorhinus
Tasselled wobbegong (E. dasypogon )
Orectolobus Sutorectus
Cobbler wobbegong (S. tentaculatus )
Parascylliidae (Collared carpet sharks)
Cirrhoscyllium Parascyllium
Collared carpetshark (P. collare )
Rusty carpetshark (P. ferrugineum )
Ginger carpetshark (P. sparsimaculatum )
Necklace carpetshark (P. variolatum )
Rhincodontidae
Stegostomatidae
Order Pristiophoriformes (Sawsharks)
Pristiophoridae
Pliotrema
Sixgill sawshark (P. warreni )
Pristiophorus
Order Squaliformes
Centrophoridae (Gulper sharks)
Dalatiidae
Euprotomicroides
Taillight shark (E. zantedeschia )
Heteroscymnoides
Longnose pygmy shark (H. marleyi )
Mollisquama Dalatias Isistius
Cookiecutter shark (I. brasiliensis )
South China cookiecutter shark (I. labialis )
Largetooth cookiecutter shark (I. plutodus )
Euprotomicrus
Pygmy shark (E. bispinatus )
Squaliolus
Smalleye pygmy shark (S. aliae )
Spined pygmy shark (S. laticaudus )
Etmopteridae
Aculeola
Hooktooth dogfish (A. nigra )
Centroscyllium
Highfin dogfish (C. excelsum )
Black dogfish (C. fabricii )
Granular dogfish (C. granulatum )
Bareskin dogfish (C. kamoharai )
Combtooth dogfish (C. nigrum )
Ornate dogfish (C. ornatum )
Whitefin dogfish (C. ritteri )
Etmopterus (Lantern sharks)
New Zealand lanternshark (E. baxteri )
Blurred lanternshark (E. bigelowi )
Shorttail lanternshark (E. brachyurus )
Lined lanternshark (E. bullisi )
E. burgessi
Cylindrical lanternshark (E. carteri )
Tailspot lanternshark (E. caudistigmus )
Combtooth lanternshark (E. decacuspidatus )
Pink lanternshark (E. dianthus )
E. dislineatus
Blackmouth lanternshark (E. evansi )
Pygmy lanternshark (E. fusus )
Broadbanded lanternshark (E. gracilispinis )
Southern lanternshark (E. granulosus )
Caribbean lanternshark (E. hillianus )
Smalleye lantern shark (E. litvinovi )
Blackbelly lanternshark (E. lucifer )
Slendertail lanternshark (E. molleri )
Dwarf lanternshark (E. perryi )
African lanternshark (E. polli )
Great lanternshark (E. princeps )
False lanternshark (E. pseudosqualiolus )
Smooth lanternshark (E. pusillus )
Dense-scale lantern shark (E. pycnolepis )
West Indian lanternshark (E. robinsi )
Fringefin lanternshark (E. schultzi )
Thorny lanternshark (E. sentosus )
Velvet belly lantern shark (E. spinax )
Splendid lanternshark (E. splendidus )
Tasmanian lanternshark (E. tasmaniensis )
Brown lanternshark (E. unicolor )
Hawaiian lanternshark (E. villosus )
Green lanternshark (E. virens )
Miroscyllium
Rasptooth dogfish (M. sheikoi )
Trigonognathus
Oxynotidae (Rough sharks)
Somniosidae (Sleeper sharks)
Centroscymnus Centroselachus Proscymnodon
Largespine velvet dogfish (P. macracanthus )
Plunket shark (P. plunketi )
Scymnodalatias
Whitetail dogfish (S. albicauda )
Azores dogfish (S. garricki )
Sparsetooth dogfish (S. oligodon )
Sherwood dogfish (S. sherwoodi )
Scymnodon
Smallmouth velvet dogfish (S. obscurus )
Knifetooth dogfish (S. ringens )
Somniosus Zameus
Squalidae (Dogfish sharks)
Cirrhigaleus
Roughskin spurdog (C. asper )
Mandarin dogfish (C. barbifer )
Squalus (Spurdogs)
Spiny dogfish (S. acanthias )
Eastern highfin spurdog (S. albifrons )
S. acutirostris
Western highfin spurdog (S. altipinnis )
Longnose spurdog (S. blainville )
Fatspine spurdog (S. crassispinus )
Cuban dogfish (S. cubensis )
Eastern longnose spurdog (S. grahami )
Japanese spurdog (S. japonicus )
Shortnose spurdog (S. megalops )
Blacktailed spurdog (S. melanurus )
Shortspine spurdog (S. mitsukurii )
Bartail spurdog (S. notocaudatus )
Western longnose spurdog (S. nasutus )
Cyrano spurdog (S. rancureli )
Pacific spiny dogfish (S. suckleyi )
Order Squatiniformes (Angel sharks)
На других языках - [en] Mexican hornshark [ru] Мексиканская бычья акула Мексиканская бычья акула[1] (лат. Heterodontus mexicanus) — вид хрящевых рыб рода бычьих акул семейства разнозубых акул. Обитает в восточной части Тихого океана. Встречается от берега до глубины 50 м. Размножается, откладывая яйца, заключённые в яйцевые капсулы. Максимальная зафиксированная длина 70 см. Не является объектом коммерческого промысла.
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