Western Wobbegong

O. hutchinsi are mainly benthic organisms, meaning they spend most of their lives on the seafloor. Wobbegongs as a genus are usually found in temperate and tropical continental water in the western Pacific and eastern Indian Ocean, but the western wobbegong is part of the recent diversification in Australian waters. O. hutchinsi is one of the 7 wobbegong species to be recorded in Australian waters, out of the 8 total wobbegong species recognized as valid. O. hutchinsi has been found in waters from 0.1 to 106 m, showing that they prefer to live in the shallow water of the continental shelf. They live in rocky reefs or seagrass habitats, and use their high patterned skin to camouflage to their surroundings and await prey.

O. hutchinsi tends to mate in late July, and females can store sperm for up to 6 months. Although more genetic analysis is needed, it is hypothesized that this may be an evolutionary adaptation to make sure the female has a constant supply of sperm, as well as increasing genetic diversity in that females can store sperm from more than one male. In wobbegong sharks, ovulation is hypothesized to occur in a biennial or triennial cycle, meaning it happens 2-3 times per year. The gestation period for O. hutchinsi is 9–11 months, and O. hutchinsi females have litters of about 23 pups. Compared to other wobbegong species, O. hutchinsi can carry a larger litter to term because they are not physiologically constrained by uterus structure or size.

Wobbegong sharks are a species located under the elasmobranch subclass of Chondrichthyes, meaning the wobbegongs are cartilaginous fish with 4-7 gill slits. Elasmobranch fish have survived four mass-extinctions, and it is speculated that members of the elasmobranch lineage (including western wobbegong sharks) are related to ancestors from the Mesozoic period. The orectolobidae genus of sharks likely diversified from their other ancestors in the Miocene age, which may explain the high distribution of wobbegongs within the Inso-Australian region. It is suspected that there was a rapid spreading of wobbegong sharks within the last 2 million years, despite there being a lack of an extensive fossil record. This rapid spreading and diversification of wobbegongs was likely caused by two distinct events: major tectonic plate movement in the region causing geological changes, and glacial cycles causing changes in oceanography, coastal geology, and geographic barriers. These two potential changes may have occurred simultaneously or sequentially, but both were likely factors in influencing the present day wobbegong distribution. Genetically, studies have been conducted to analyze the western wobbegong's mitochondrial DNA to determine their relation to other wobbegong species, which found that O. …