Condritti - Chondrichthyes - Pesci Cartilaginei

Aquila di Mare Maculata - Aetobatus narinari

Aquila di Mare Maculata - Aetobatus narinari

L’Aquila di Mare Maculata (Aetobatus narinari) è un pesce cartilaginoso della famiglia Myliobatidae. Vive nelle regioni tropicali, tra cui l'Oceano Atlantico, Pacifico e Indiano. ...
Dasiatidi - Dasyatidae

Dasiatidi - Dasyatidae

I Dasiatidi (Dasyatidae Jordan & Gilbert, 1879) sono una famiglia di pesci cartilaginei dell'ordine Myliobatiformes, Classe Chondrichthyes, ...
Black Spotted Stingray - Taeniura meyeni

Black Spotted Stingray - Taeniura meyeni

The black Spotted Stingray (Taeniura meyeni) is a species of stingray  in the family Dasyatidae, found throughout the nearshore waters of the tropical Indo-Pacific ...
Bluespotted ribbontail ray - Taeniura Lymma

Bluespotted ribbontail ray - Taeniura Lymma

The bluespotted ribbontail ray (Taeniura lymma) is a species of stingray in the family Dasyatidae. Found from the intertidal zone to a depth of 30 m (100 ft), ...
Common Stingray - Dasyatis Pastinaca

Common Stingray - Dasyatis Pastinaca

The stingray, a breed belonging to the family Dasyatidae, Class Chondrichthyes, is widespread in the North Atlantic Ocean and in the Mediterranean ...
Pelagic stingray - Pteroplatytrygon Violacea

Pelagic stingray - Pteroplatytrygon Violacea

Pelagic stingray, Purple trigon (Pteroplatytrygon violacea (Bonaparte, 1832)), is a fish of the family Dasyatidae, the only species of the genus Pteroplatytrygon. ...
Hammerhead Shark - Sphyrnidae

Hammerhead Shark - Sphyrnidae

Sphyrnidae is a family of large cartilaginous marine water fish belonging to the order Carcharhiniformes. They are commonly known as hammerhead sharks. ...
Squalo dalle punte argentee - Carcharhinus albimarginatus

Squalo dalle punte argentee - Carcharhinus albimarginatus

Lo squalo dalle punte argentee (Carcharhinus albimarginatus) è una grossa specie di squalo della famiglia dei Carcarinidi diffusa, con areale discontinuo, nelle acque tropicali dell'oceano Indiano e dell'oceano Pacifico. ...
Squalo Grigio - Carcharhinus plumbeus

Squalo Grigio - Carcharhinus plumbeus

Lo squalo grigio (Carcharhinus plumbeus (Nardo, 1827)) è una specie di squalo del genere Carcharhinus e della famiglia Carcharhinidae. ...
Squalo Nutrice - Ginglymostoma cirratum

Squalo Nutrice - Ginglymostoma cirratum

La Nutrice o Squalo nutrice (Ginglymostoma cirratum (Bonnaterre, 1788)) fa parte della famiglia degli Squali nutrice, ed è l'unico membro del suo genere (Ginglymostoma) ...
Tawny nurse shark - Nebrius ferrugineus

Tawny nurse shark - Nebrius ferrugineus

Tawny nurse shark (Nebrius ferrugineus) is a species of carpet shark in the family Ginglymostomatidae, and the only extant member of the genus Nebrius. ...
Tiger shark - Galeocerdo cuvier

Tiger shark - Galeocerdo cuvier

Lo Squalo Tigre (Galeocerdo cuvier) è un pesce cartilagineo della famiglia dei Carcarinidi. Si tratta dell'unica specie nota appartenente al genere Galeocerdo. Il suo corpo, slanciato e affusolato, che ne denota le qualità di ottimo nuotatore ......
Whitetip reef shark - Triaenodon obesus

Whitetip reef shark - Triaenodon obesus

Whitetip reef shark (Triaenodon obesus) is a species of requiem shark, in the family Carcharhinidae, and the only member of its genus. ...

Chondrichthyes, or even cartilaginous fishes, are a class of fish that includes over 1100 different species and to which belong sharks and rays (included in the sub-class of the Elasmobranchii), the chimeras (subclass of the Holocephali) and the forms related. They are distinguished at first sight by the bony fish due to the lack of symmetry on a horizontal plane, in particular the mouth is lower, and the fin is asymmetric. Condritti Chondrichthyes Pesci Cartilaginei cartilaginous fishes intotheblue

squalo pinna bianca del reef Triaenodon obesus Whitetip reef shark intotheblue.it

Biology

These are organisms that have the peculiarity of having an internal cartilaginous skeleton, name of the class that literally means cartilaginous fish. They do not therefore possess dermal bones. The skull is platibase, protometamer in the elasmobranchs and auximetamer in the olocephallic; it can show an amphysilic mandibular suspension (more archaic forms), iostilica (more recent elasmobranchi) or self-esthetic (olocephalic). Condritti Chondrichthyes Pesci Cartilaginei cartilaginous fishes intotheblue

Most of the species have 5 gill slits (6 or 7 in some elasmobranchs, 4 in the olocephali) generally without operculum, present only in the olocephaliops where the spiracle is missing. All the Chondricks have placoid dermal flakes and a developed electroreceptor apparatus.

Squalo grigio - Carcharhinus plumbeus - sandbar Shark - intotheblue.it
Squalo grigio – Carcharhinus plumbeus – sandbar Shark – intotheblue.it

Reproduction

Reproduction is sexed with internal fertilization, which occurs thanks to the presence in males of pterygopodia, two appendices with a copulatory function that extend from the central region of the pelvic fins. The olocephali can also have a frontal appendix on the head equipped with teeth to grasp the female during the coupling. The species can be oviparous, ovoviviparous or even viviparous and do not produce a conspicuous offspring, for which they are considered to be at high risk of extinction.

Evolutionarily they developed by radiation from the Placoderms during the Devonian, at the same time as the Osteitti.

Nebrius ferrugineus – Squalo nutrice- Stefano
Trigone Dasyatis pastinaca intotheblue.it
Trigone Dasyatis pastinaca intotheblue.it

https://it.wikipedia.org/wiki/Chondrichthyes https://en.wikipedia.org/wiki/Chondrichthyes

 

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