Cockroaches (Blattodea, several families)

A good reference for Cockroaches is the book “A Guide to the Cockroaches of Australia” by David Rentz. https://www.publish.csiro.au/book/6710/

This webpage by the CSIRO is also useful:
http://anic.ento.csiro.au/insectfamilies/order_overview.aspx?OrderID=42509&PageID=overview

Cockroaches (Blattodea, several families)

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Discussion

MegFluke wrote:

14 Jan 2025

I really shouldn’t be surprised but I saw nine tiny wasps instead of a cockroach when I looked in the container today - I’m assuming they’re Evaniidae (family), but there are nine and apparently Evaniidae only lay one egg per ootheca…
Unfortunately I didn’t choose a great container so it’s hard to get (good) photos, but I’ve popped them in the fridge so I can transfer them to something better to take pictures of them.

Blattodea (order)

KimberiRP wrote:

3 Jan 2025

Cockroach ootheca.

Blattodea (order)

trevorpreston wrote:

20 Dec 2024

I think this is more likely to be a Balta Sp. possibly B.bicolor, but I need to check its range and other similar species.

Ellipsidion sp. (genus)

trevorpreston wrote:

20 Dec 2024

Balta Bicolor female

Balta bicolor

trevorpreston wrote:

18 Dec 2024

I found several of these inside an old palm sheath on the ground, and admittedly am making the leap that they are Allacta australiensis. Nymphs in "A Guide to the Cockroaches of Australia" by David Rentz are similar, and other examples via a google search also look similar. This is the only example of its genus in Australia, and while Rentz shows it does not occur south of the Queensland border, it mentions distribution is patchy. It is associated with specific host trees which fits, although Rentz does not mention which trees. This is the only nymph I can find which remotely matches this specimen.

Allacta australiensis