A month ago I wrote about finding a group of tiny just-emerged mantis nymphs. (‘Nymphs’ covers all stages of development except adults, from just-hatched to nearly fully developed.) In a footnote to that post I mentioned a larger nymph I discovered a little later. I have been observing and photographing that one and its relations (at least two more hatchings, all on a particular patch of weeds) since then and now have a reasonably complete record of their development.
First, the hatchlings (click on any photo for a larger image). They are quite different from the ones in my previous post. Most obviously, they are paler and have pairs of brown spots all the way along head and body. Also, their head is much broader than their thorax, and their typical posture is different: straddle-legged and straight-backed.
Mantises moult to move on to the next stage – the next ‘instar’ – of their development. The next stage I recognise is still completely wingless but the brown spots have faded. One or two instars later, wing buds appear; they have a faint mottling of darker green, as do the front legs. The nymphs are still straddle-legged but a new characteristic posture appears: they flatten themselves against the leaf they are on. They spend more time underneath their leaf than on top of it, at least by day.
Finally, the adult, about 20 mm long: the broad wings are translucent (note the leaf veins visible through them) and marked in a pattern of dark and light veining which resembles the pattern of the leaf itself. Around the ‘shoulder’ of each upper wing is a short row of yellowish spots, with minute black dots between them.
So what is it? Certainly a mantis (Mantodea, Mantidae) but not the common green Garden Mantid (Orthodera ministralis). It looks much more like the mantid shown here as Neomantis australis, but that one is still different in several ways: it has narrower wings, is more nearly transparent and yellower overall, and has dark eyes (which may be due to the fact that it is a photo of a dead insect). CSIRO’s (poor) photo of Neomantis australis shows an insect more like mine but with a transverse pale stripe across its wings, more like the one I saw on Hervey’s Range.
I suspect there are at least two species or sub-species amongst all these but for now I will just call my little family Neomantis australis with one or two question marks.