#Apristurus

[todropscience]

THREE NEW SHARK SPECIES THIS WEEK!

The second week of July 2023 something extraordinarily beautiful happened, the findings of 3 new species of sharks for were announced

A new angel sharks species was identified, from the western Indian Ocean on the Mascarene Plateau and off southwestern India in 100–500 m depths, the Lea’s angel shark Squatina leae, was recognized to be different genetically and morphologically distinct from its congeneric species Squatina africanae, following unique morphological features.  This species was first detected in 1988 after finding  three unusual, small sharks, but till today was completely understood. The angel shark is named after one of the author’s fiancee’s late sister, Lea-Marie Cordt.

-  Squatina leae, adult male, in dorsolateral.

Angel sharks are “flatter sharks”, possesing distinctly broad, dorsoventrally flattened bodies, a short snout with large mouth and nostrils, eyes on top of the head close to the large spiracles, very large pectoral fins, and a lateral caudal keel. They've evolved to be ambush predators, they lie in wait for prey to pass closely overhead before attacking.

Reference (Open Access):  Weigmann et al., 2023. Revision of the Western Indian Ocean Angel Sharks, Genus Squatina (Squatiniformes, Squatinidae), with Description of a New Species and Redescription of the African Angel Shark Squatina africana Regan, 1908. Biology 

From North Australia, another species of hornshark is described based on six whole specimens and a single egg case. The painted hornshark Heterodontus marshallae was previously considered to be the same with the zebra bullhead shark another well know bullhead shark from the central Indo-Pacific from Japan  to Australia, but genetic and morphological analyses indicated the sharks were different, but looking alike. The painted hornshark is endemic to northwestern Australia and occurs in deeper waters, at 125–229 m below surface.

-  Lateral view of two mature female painted hornshark Heterodontus marshallae showing small differences between individuals

The painted hornsharks is named in honour of Dr. Lindsay Marshall www.stickfigurefish.com.au a scientific illustrator and elasmobranch scientist who expertly painted all the sharks and rays of the world for the Chondrichthyan Tree of Life Project.

Reference (Open Access): White et al., 2023 Species in Disguise: A New Species of Hornshark from Northern Australia (Heterodontiformes: Heterodontidae). Diversity.

And from an unidentified shark egg collected from the deep waters of northwestern Australia, in 2011 recently helped researchers identify a new species of deep water cat shark. Called ridged-egg catshark Apristurus ovicorrugatus after its eggs, it was collected in the earlys 90 but remained unknown to date. This sharks presents white eyes, and is small in size, reaching less than a half meter in length. .

- Lateral view of female Apristurus ovicorrugatus before preserved. Photo by  CSIRO. 

Egg cases belonging to this species had been documented as early as the 1980s, but could not be matched to any species of Australian shark until recently scientists examined a shark specimen of previously uncertain identity in the CSIRO collection.

 -egg cases of Apristurus ovicorrugatus. Scale bar is 10 mm

Reference (Open Access) White,et al., 2023 What came first, the shark or the egg? Discovery of a new species of deepwater shark by investigation of egg case morphology. Journal of Fish Biology.

[shark-of-tha-day]

shark of the day: ghost catshark, apristurus manis ------------------------------------------------------------ the ghost catshark is a species of deep water catshark. they grow to be around 85 cm(~2.7 ft) long. ghost catsharks are found in deep waters in very specific parts of the atlantic ocean including  massachussetts in the us, porcupine bank near ireland, and around cape town in south africa. they eat deep water fish and invertebrates.

[bone-soup-explosion]

This is the new shark species

identified from museum specimens which is hilarious to me because they had these egg cases and only now figured out that a misclassification occurred

it’s a demon/ghost catshark!

[sharkposting]

Shark of the day 2:

Shortbelly Catshark

The shortbelly catshark (Apristurus breviventralis) is a catshark of the family Scyliorhinidae. It is found in Gulf of Aden, Indian Ocean. This species most closely resembles the western Atlantic species Apristurus canutus, but is distinguishable in having greater nostril length than internarial width and longer claspers in adult males.

[michaelroofian]

Weird demon shark with bright white eyes discovered off Australia

The shark Apristurus ovicorrugatus was identified as a new species over a decade after the first mystery egg cases were found in a Western Australian museum collection. from Livescience https://www.livescience.com/animals/sharks/weird-demon-shark-with-bright-white-eyes-discovered-off-australia via IFTTT

[enigmahitam]

Hiu berjumbai (Chlamydoselachus anguineus) atau Frilled Shark dalam bahasa inggris merupakan salah satu dari dua spesies ikan hiu yang masih ada di keluarga Chlamydoselachidae dengan distribusi yang luas tapi tidak merata di samudra atlantik dan samudra pasifik. . Mereka ditemukan dikedalaman 1.570 meter, sedangkan di teluk surugaya jepang hiu ini paling umum ditemukan pada kedalaman 50-200 meter. . Namun pada tahun 2009 jenis baru hiu berjumbai di afrika selatan, dan pada bulan november 2017 baru-baru ini hiu tersebut terdampar di pantai di portugal. . hiu ini merupakan penghuni laut dalam yang menyebabkan metabolisme tubuh hiu ini menjadi lemah karena suhu yang sangat dingin diperairan dalam. . Perairan dalam ini pula yanng menyebabkan memiliki bentuk fisik yang unik, hiu berjumbai telah tercatat dari sejumlah lokasi di samudra atlantik dan pasifik, yaitu di atlantik timur di norwegia, di utara skotlandia, irlandia barat, dari Prancis hingga ke maroko termasuk madeira dan luar mauritania. . panjang rahang hiu berjumbai sangat bisa dibedakan dengan kelenturan yang sangat lebar, sehingga memmungkinkan untuk menelan mangsa utuh lebih dari setengah ukuran nya, hiu ini biasa memangsa cumi-cumi, ikan, hiu lain yang berukuran kecil seperti hiu kucing jepang (Apristurus japonicus). . Sc image: Australian Geographic Sc caption: Wikipedia ============================================ Kunjungi kanal Enigma Hitam di YouTube untuk konten video misteri, konspirasi, sejarah, mitologi, creepypasta dan lainnya. . Follow instagram ini untuk mendapatkan kasus atau kisah menarik lainnya ⬇ ❓ @enigmahitam ❔ ❓ @enigmahitam ❔ . #enigmahitam #enigma #creepypasta #konspirasi #mitologi #sejarah #film #horror #alien #podcast #fakta #misteri #lovecraftmythos #indonesia #hplovecraft #beritaviral #trendingtopic #trending #infomenarik #info #infounik #infoterkini #faktaaneh #faktaunik #faktamenarik #reels #prasejarah #fossil https://www.instagram.com/p/CoTl_aEPv8L/?igshid=NGJjMDIxMWI=

[mbari-blog]

Sharks are beautiful animals, and if you're lucky enough to see lots of them, that means that you're in a healthy ocean. You should be afraid if you are in the ocean and don't see sharks. —Sylvia Earle⁠ ⁠ This #SharkWeek, we'd like to highlight the beauty and ecological significance of these captivating creatures. From the mighty great white to the tiny dwarf lantern shark, the diverse array of shark species play a pivotal role in many ocean ecosystems and help to support a healthy ocean. ⁠ ⁠ In the deep sea, we often come across this spectacular species—the longnose catshark, Apristurus kampae. These catsharks are found at depths ranging from 180 to 1,900 meters (about 600 to 6,300 feet). Catsharks are bottom feeders, often sleeping in groups during the day and hunting at night.

[chilirasbora]

Spongehead catshark | Apristurus spongiceps

Fun fact: the spongehead catshark has only three official reports: two specimens, an adult female and a juvenile, as well as the above image taken by the Pisces IV in 2002

Photo credit: x

[foxpapa]

GATTUCCIO ABISSALE - Apristurus profundorum Isole Galapagos, Ecuador Fotografia di Norbert Wu, Minden Pictures, National Geographic Creative

[sfbaymsi]

Creature Feature: Iceland Catshark

Click to read about Taxonomy and this weeks Creature Feature!

Today we are going to talk about a species of shark that is a part of a very chaotic genus. If you have heard of the scientific concept “taxonomy” then you may know what a genus is. Taxonomy is the practice and science of classification. When looking at different sharks, scientists notice the way they look, where they live, and in recent years, their genetics to help classify them and put them…

[shark-of-tha-day]

shark of the day: brown catshark, apristurus brunneus ------------------------------------------------------------ brown catsharks are small deep sea sharks. they can grow to be up to 68 cm(~2.2 ft) in length. brown catsharks are found around in deep water along the continental slopes of the eastern pacific in subtropical regions. they feed on small deep water fish, shrimp, krill, and squid.

[shark-of-tha-day]

shark of the day: pale catshark, apristurus sibogae

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pale catsharks are rare deepwater catsharks only known from one specimen. their full length is unknown as the only specimen taken was a juvenile  measuring 21 cm(~8 in). pale catsharks are presumed to be distributed through the western central pacific around borneo near continental slopes. they likely feed on small deep water fish and invertebrates.

[shark-of-tha-day]

shark of the day: broadnose catshark, apristurus investigatoris

------------------------------------------------------------

broadnose catsharks are small deepwater catsharks known only from one specimen. their full length is unknown as the type specimen is an immature female measuring only 26 cm(~10 in) long. the broadnose catshark is found in the deep waters of the andaman sea, though their range may extend further into the eastern indian ocean. they likely feed on small fish and invertebrates.

[shark-of-tha-day]

shark of the day: iceland catshark, apristurus laurussonii ------------------------------------------------------------ iceland catsharks, also called flathead catsharks, are small deep water demon catsharks. they can grow to be up to around 67 cm(~2.1 ft) long. the iceland catshark is found in the northern atlantic on the upper continental slopes. the feed mainly on small squids, bony fish, marine worms, and crustaceans.

[mbari-blog]

Meet the largest family of living sharks today—deep-sea catsharks.

Deep-sea catsharks are the largest family of living sharks today, with more than 90 species. Catsharks were named for their long, cat-like eyes that are specialized for seeing in low light conditions. These a-meow-zing sharks can be found up to 2,200 meters (7,200 feet) below the surface and grow up to 75 centimeters (30 inches).

MBARI has observed several deep-sea catshark species, for example, the brown catshark (Apristurus brunneus), longnose catshark (Apristurus kampae), lollipop catshark (Cephalurus cephalus), and filetail catshark (Parmaturus xaniurus). Most catsharks lay elaborate clusters of egg cases. The eggs can take up to two years to develop. Tough egg cases, made of keratin protect the developing embryos from predators. A changing ocean means an uncertain future for catsharks. Warming waters could affect developing embryos, and expanding low-oxygen zones could displace adult populations.