Identification tips for the native White-clawed ... - Biodiversity Ireland

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or by E-mail: [email protected]. Horizontal ... Very broad claws with two widely spaced nodules on ... sp
Identification tips for the native White-clawed crayfish and some non-native crayfish species

White-clawed crayfish

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Photo credits: 1. 2. 3. 4. 5. 6. 7.

(Body colour can be very variable)

Normally a brown to olive colour, can be bluish.

Signal crayfish

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3

Red or maroon body. Large red tubercles (nodules) and spines on claws give knobbly appearance

White or turquoise patch at junction of ‘fingers’

Spiny-cheek crayfish

Red swamp crayfish

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Marbled crayfish

D. Gerke Trevor Renals I. Duloup_CC-BY-SA-3.0 www.uni-kiel.de/zoologie/limnologie/ Casey D. Swecker Crown Copyright 2009 www.rakipolskie.pl Noble crayfish

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Very broad claws with two widely spaced nodules on inner side of fixed finger

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Turkish crayfish 7

Fingers long, straight and narrow Horizontal brown stripe on each abdominal segment

Body bluish tinged to brightly blue with a marbled pattern.

Report sightings: http://records.biodiversityireland.ie/record/invasives or by E-mail: [email protected]

Identification tips on the claws of the native White-clawed crayfish and some non-native crayfish species

White-clawed crayfish 1

Photo credits:

(Underside of claws shown in the photos)

Whitish underside of claws, NEVER red

Signal crayfish

Turkish crayfish

2

Noble crayfish

Red swamp crayfish

NPWS Manual No. 45 GBNNSS Crown Copyright 2009 Trevor Renals Copyright Jens Keicher Crown Copyright 2009 (c) Rian Vestors Natuurfotografie © Michal Maňas. BioLib.cz Marbled crayfish

Spiny-cheek crayfish

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Underside tip of claws are orange with a black band below

Fingers of claws are long, straight and narrow

Underside of claws are red

1. 2. 3. 4. 5. 6. 7.

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5

Blue with marbled pattern

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6

Knobbly claws with red tubercles

Claws very broad, reddish-brown underneath and with widely spaced nodules on the inner side of the fixed finger

Report sightings: http://records.biodiversityireland.ie/record/invasives or by E-mail: [email protected]