How to photograph crayfish for iNaturalist

How to photograph crayfish for inaturalist

In order for crayfish to be adequately identified, it is helpful to provide
a variety of views of the crayfish. Dorsal and lateral views should be
always provided:

In the dorsal view, make sure both the areola and rostrum are
visible:

Lateral view:

Of utmost importance for many species are photos of the gonopod (for
males) or annulus ventralis (for females).

The following image shows the ventral view of an adult male crayfish.
The gonopods are its reproductive organs. They are normally tucked
between the walking legs.

It will often be necessary to pry one into
view with a toothpick or probe. The most useful views are from a
lateral or mesial aspect.

Try to get a closeup view clearly showing the features at the tip:

The following is an image of the ventral side of a female. A closeup
photo of annulus ventralis is very helpful (small round feature between
the last two pairs of walking legs).



Try to get a clear closeup of the annulus ventralis and surrounding area
as follows.

Additional views that may be helpful for identification include:

The chela (claw)

Any hooks present in adult males

The tail fan

Αναρτήθηκε από dan_johnson dan_johnson, Μάιος 11, 2018 0612 ΜΜ

Σχόλια

Added this to the "more info" section on the right side of the taxon page>About tab!
https://www.inaturalist.org/taxa/47783-Astacoidea

Αναρτήθηκε από bouteloua πάνω από 4 χρόνια πριν (Αναφορά)

Ah, good idea! Didn't think about that.

Αναρτήθηκε από dan_johnson πάνω από 4 χρόνια πριν (Αναφορά)

Excellent journal entry, Dan. I’ve bookmarked this to copy and paste on observations that need some assistance for their crayfish observations! Thanks for putting this together!

Αναρτήθηκε από sambiology περίπου 4 χρόνια πριν (Αναφορά)

Very nice. Good information. Thanks.

Αναρτήθηκε από sagamoreoh περίπου 4 χρόνια πριν (Αναφορά)

Thank you for the excellent education on identification of crayfish. Carol R.

Αναρτήθηκε από carolr περίπου 4 χρόνια πριν (Αναφορά)

good info....thanks

Αναρτήθηκε από blueturtle περίπου 4 χρόνια πριν (Αναφορά)

This is great. Thanks for creating this.

Αναρτήθηκε από sbadams σχεδόν 4 χρόνια πριν (Αναφορά)

Excellent! I've been meaning to create something like this as it is very useful.

Αναρτήθηκε από heteromyid πάνω από 3 χρόνια πριν (Αναφορά)

Hope to be able to use this excellent guide when I come across another crayfish. Thanks.

Αναρτήθηκε από mfeaver πάνω από 3 χρόνια πριν (Αναφορά)

excellent post Dan. I wish there were more than 2 easy to identify species in CA so I could start observing crayfish this way - time for a field trip to the southeast

Αναρτήθηκε από loarie περίπου 3 χρόνια πριν (Αναφορά)

@loarie -- you're welcome to Texas ANYTIME!!! :)

Αναρτήθηκε από sambiology περίπου 3 χρόνια πριν (Αναφορά)

GREAT, thank you

Αναρτήθηκε από skrentnyjeff πάνω από 1 χρόνo πριν (Αναφορά)

thank you

Αναρτήθηκε από gary-james πάνω από 1 χρόνo πριν (Αναφορά)

Great information, @dan_johnson. You seem to have a way of getting the crawfish to hold still for photos of the gonopod or annulus ventralis. Is it called "cooking"? ;-)

Αναρτήθηκε από baldeagle 8 μήνες πριν (Αναφορά)

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