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In contrast, adelphophagy is the cannibalism of a multi-celled embryo. [1] Oophagy is thought to occur in all sharks in the order Lamniformes and has been recorded in the bigeye thresher (Alopias superciliosus), the pelagic thresher (A. pelagicus), the shortfin mako (Isurus oxyrinchus) and the porbeagle (Lamna nasus) among others. [1]
The largest and strongest embryos consume their siblings in the womb (intrauterine cannibalism) before each surviving pup is born. [6] It has one of the lowest reproduction rates of all sharks and is susceptible to even minimal population pressure , so it is listed as vulnerable and is protected in much of its range.
This phenomenon of embryonic cannibalism may play a role in sexual selection, as males compete post-fertilization for paternity. [16] Thus, intrauterine cannibalism in sharks may reflect not only sibling rivalry, but also male competition for successful mating with females, which is an example of sexual selection.
A female shark has hatched an egg without it being fertilised by a male, a zoo in Illinois has said. Brookfield Zoo said the hatching of an epaulette shark pup was not unusual, but the way in ...
The arrival of a baby swell shark at an aquarium in Louisiana has caused a wave of excitement, after the egg hatched despite the fact that no male sharks appear to have been involved.
The characteristic quivering abdomen caused by movement of tadpoles within a pregnant female Limnonectes larvaepartus.. Ovoviviparity, ovovivipary, ovivipary, or aplacental viviparity is a term used as a "bridging" form of reproduction between egg-laying oviparous and live-bearing viviparous reproduction.
The frilled shark eats a diet of cephalopods, Nudibranchs, smaller sharks, and bony fish; [2] 60 percent of the diet is composed of squid varieties, such as the Chiroteuthis, the Histioteuthis, and the Onychoteuthis, the Sthenoteuthis and the Todarodes; [17] and other sharks, as indicated by the stomach contents of a 1.6 m (5.2 ft)–long ...
A newborn great white shark has been spotted in the wild for the first time, experts believe.. The baby shark was spotted in waters off Santa Barbara in southern California last July by wildlife ...