Search results
Results from the WOW.Com Content Network
The draughtsboard shark (Cephaloscyllium isabellum) is a species of catshark, and part of the family Scyliorhinidae, so named for its "checkerboard" colour pattern of dark blotches. It is endemic to New Zealand , where it is also known as the carpet shark (which usually refers to the entire order Orectolobiformes ). [ 2 ]
The egg case genera Palaeoxyris and Fayolia, which are thought to have been produced by hybodonts and xenacanths respectively, two groups of extinct shark-like cartilaginous fish more closely related to modern sharks and rays than to chimaeras, resemble those of bulldog sharks in having a spiral collarettes running around them.
This shark is oviparous and females lay pairs of distinctively ridged egg capsules at 20- to 30-day intervals. The eggs hatch after 11–12 months. The eggs hatch after 11–12 months. Harmless and of little commercial interest , many Australian swellsharks are caught incidentally in gillnets and bottom trawls but usually survive to be released ...
The Port Jackson shark is a nocturnal species which peaks in activity during the late evening hours before midnight and decreases in activity before sunrise. [2] A study showed that captive and wild individuals displayed similar movement patterns and the sharks' movements were affected by time of day, sex, and sex-specific migrational behaviour.
The best-preserved specimen of Helicoprion is IMNH 37899 (also known as "Idaho 4"), referred to Helicoprion davisii. It was found in Idaho in 1950 and was originally described in 1966 by Svend Erik Bendix-Almgreen. [8] A 2013 redescription by Tapanila and colleagues was accompanied by CT scanning, to reveal the cartilaginous remains in more ...
The egg case of the puffadder shyshark has a different color pattern than those of other shysharks. The puffadder shyshark is oviparous; there is no distinct breeding season and reproduction occurs year-round. [14] Females deposit egg capsules one or two at a time, attaching them to vertical structures such as sea fans. [12]
Catshark egg (mermaids' purse) Scyliorhinidae includes many species of catsharks, that like the chain dogfish, are oviparous and lay eggs in tough egg cases with curly tendrils at each end, known as "mermaid's purses", for protection, onto the seabed. [15] Almost a year is needed for a catshark to hatch from the egg.
Egg case with yolk. The swell shark is oviparous, laying two green or amber flattened eggs at a time. [1] [3] Fertilization occurs internally. [5] The egg cases become attached to kelp or the reef with tendrils. It has been suggested that the length of the tendrils depends on the amount of surf action the region is under. [4]