Spiny crayfish at Namadgi National Park
Identification history
| Euastacus sp. (genus) | 10 May 2024 | MattBeitzel | ||
| Cherax destructor | 9 May 2024 | CarbonAI | ||
| Euastacus sp. (genus) | 9 May 2024 | HelenCross |
Identify this sighting
Please Login or Register to identify this sighting.
3 comments
MattBeitzel
wrote:
10 May 2024
This is an area that ACT gov is interested in defining the species. Unfortunately the claws are not distinctive. The body part that is the easiest to determine species from is called the gastric mill. It is part of the digestive system of the crayfish. Would like to obtain carapaces (main bodies) from dead crayfish from this area to look at the mill or good pictures of the mills.
HelenCross
wrote:
10 May 2024
Thanks Matt, there never seems to be much else left than the claws from the ones I've seen so far but will keep looking. Have you got a link to some good illustrations or images of the gastric mill and where it is?
MattBeitzel
wrote:
10 May 2024
thanks Helen. Yes they are much less common than claws after predation events
try
https://www.researchgate.net/figure/The-gastric-mill-and-its-components-A-Cherax-quadricarinatus-specimen-with-the-carapace_fig8_281445611
The ones needed are the outer mill structures (Zt) shown in the figure and in Figure 2. Not the parrot beak structure in the middle.
They are located in the front third of the carapace but are not the external mandibles. Usually in a long dead specimen they are packed with dried vegetable matter that is their food.
try
https://www.researchgate.net/figure/The-gastric-mill-and-its-components-A-Cherax-quadricarinatus-specimen-with-the-carapace_fig8_281445611
The ones needed are the outer mill structures (Zt) shown in the figure and in Figure 2. Not the parrot beak structure in the middle.
They are located in the front third of the carapace but are not the external mandibles. Usually in a long dead specimen they are packed with dried vegetable matter that is their food.
Location information
- Coordinates 148.903544-35.535039
- Altitude 1380.9m
- Maps Namadgi National Park
- Places Tennent, ACT
Sighting information
- 4 - 15 Abundance
- 9 May 2024 10:33 AM Recorded on
- HelenCross Recorded by
-
Collections
Other Arthropods Freshwater Crayfish Crustaceans (Crustacea)
Additional information
- 25mm to 50mm Animal size
Species information
- Euastacus sp. (genus) Scientific name
- Spiny crayfish Common name
- Not Sensitive
- Local native
- Non-invasive or negligible
- Up to 1914m Recorded at altitude
- Machine learning
- External link More information
Record quality
- Images or audio
- More than one media file
- Verified by an expert moderator
- Nearby sighting(s) of same species
- GPS evidence of location
- Description
- Additional attributes
