#egglaying — Public Fediverse posts

In #Astigmata #mites #ovipore and #copulatory organ are spatially separated, an #evolutionary innovation that allows #spermtransfer, its #storage in the receptaculum seminis, and #egglaying to occur simultaneously. W. Witalinski (2014) described the #oogenetic and #inseminatory (secondary) #system.©#StefanFWirth

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reference
W.Witalinski (2014)
https://doi.org/10.1016/j.asd.2014.04.003

#SEM#photos
©S.F.Wirth, #Histiostoma #maritimum,H. #palustre, H. cf. #pulchrum

This funny looking guy is a Port Jackson #shark . They're a #nocturnal, #egglaying type of #bullhead shark found in the coastal region of southern #Australia, including the waters off Port Jackson. It has a large, blunt head with prominent forehead ridges and dark brown harness-like markings on a lighter grey-brown body and can grow to 5 1/2 feet long!

It feeds on hard-shelled mollusks, crustaceans, sea urchins, and fish using a #CRUSHING PLATE in it's mouth to break shells and bones.

The teeth of the Port Jackson shark are one of its most distinguishable features. Unlike other sharks, its teeth are different in the front and back. The front teeth are small, sharp and pointed, while the back teeth are flat and blunt. These teeth function to hold, break then crush against the crushing plate.

The shark has no major importance to humans. It is not an endangered species and is not used as a common food supply. It also does not pose any danger to humans.

#CrittersOfMastodon