Name: Narrow Crayfish

Display Field: StreamName

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Description: DescriptionThe Narrow Euastacus (Euastacus angustus) is a critically endangered, small freshwater crayfish with a maximum occipital-carapace length of approximately 22-28 mm. It is typically light olive-brown to orange-brown on top, with a cream underside and orange claws that may show darker markings and bluish-green tinges on the fingers. The species is difficult to identify due to its close resemblance to other small rainforest crayfish, with only subtle differences such as a slender, laterally compressed body shape and specific spine features. It is found only in a very small area of north-eastern New South Wales, within Border Rangers National Park. It inhabits high-elevation subtropical rainforest, where it occurs in a single headwater stream and nearby gullies, likely sheltering 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 angustus'Result: An intermediate polygon boundary representing the indicative habitat distribution of Euastacus angustus.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 angustus.

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 )
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