Name: Swollen Crayfish

Display Field: StreamName

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Description: DescriptionThe Swollen Crayfish (Euastacus guruhgi) is a critically endangered, small freshwater crayfish that grows to about 3 cm long. It is usually brown to green-brown on top, with lighter colours underneath and blue-grey legs. The species is very hard to identify because it looks similar to other closely related crayfish and has only subtle differences. It is found only in a small area around Wollumbin (Mount Warning) in north-eastern New South Wales. It lives in rainforest streams and gullies, often hiding under rocks or in burrows. Distribution based on confirmed records, expert elicitation, NSW Hydro Line and the Species of National Environmental Significance (SNES) database (DCCEEW, 2026)Data Lineage & Processing History1. Source DatasetsSpecies Distribution Data: DCCEEW Species of National Environmental Significance (SNES) and selected marine and cetacean species dataset.Hydrology Data: NSW Spatial Services NSW Water Theme - Hydro Line (all stream orders)2. Geoprocessing StepsStep 1: Attribute Extraction (Species Filtering)Action: An attribute filter was applied to the DCCEEW SNES dataset to isolate the specific target species and its required probability of occurrence.Query Parameters: SCIENTIFIC_NAME = 'Euastacus guruhgi'Result: An intermediate polygon boundary representing the indicative habitat distribution of Euastacus Guruhgi.Step 2: Spatial Clip (Hydroline Extraction)Action: The NSW Water Theme - Hydro Line was spatially clipped using the filtered species habitat polygon as the bounding feature.3. Final Output DescriptionDataset Contents: This dataset represents all hydroline network features (streams and waterways) that spatially intersect with the indicative habitat footprint of Euastacus Guruhgi.

Copyright Text: Derived from DCCEEW Species of National Environmental Significance (SNES) data and NSW Spatial Services Hydro Line (NSW Water Theme) datasets.

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• StreamName ( type: esriFieldTypeString, alias: StreamName, length: 30 )
• Species ( type: esriFieldTypeString, alias: Species, length: 30 )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )

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