Crab by Beth Johnson

Folded from a square of Tant paper

Crab by Hashima Hitoshi

Diagrams in Origami La Era Nueva by Kunihiko Kasahara
Folded from a rectangle of IKEA Mala paper

Crab by Jun Maekawa

Diagrams in Origami El Mundo Nuevo by Kunihiko Kasahara
Folded from a square of Kraft origami paper

Crab by Kunihiko Kasahara

Diagrams in Cute! Cool! Beautiful! Animal Origami Book by Kunihiko Kasahara
Folded from a rectangle of textured origami paper

Crab by Oh Kyu-Seok (Jassu)

Diagrams in Tanteidan 16th convention
Folded from a square of origami paper

Crab by Peter Engel

Diagrams in Origami from Angelfish to Zen by Peter Engel
Diagrams in The Origamian - Vol.14 3,4
Folded from a $-sized rectangle of Nicolas Terry's tissue-foil

Crab (3 variations) by Akira Yoshizawa

Diagrams in Antologia di Origami Animali by Akira Yoshizawa
Diagrams in Origami Museum 1: Animals by Akira Yoshizawa

Shrimp by Akira Yoshizawa

Diagrams in Origami Museum 1: Animals by Akira Yoshizawa
Diagrams in Akira Yoshizawa - Japan's Greatest Origami Master by Akira Yoshizawa
Diagrams in Antologia di Origami Animali by Akira Yoshizawa
Diagrams in Beautiful Origami by Akira Yoshizawa
Wet folded from a triangle of cardstock

Lobster - American by Michael G. LaFosse

Diagrams in Origami Art by Michael G. LaFosse and Richard L. Alexander
Wet-folded from a square of art paper

Pillbug by Alfredo Giunta

Diagrams in Origami I Piccoli Animali (Small Animal Origami) by Alfredo Giunta
Folded from a rectangle of patterned art paper