Morphology of camouflage by encrustation in the spider crabs Schizophrys dahlak and Hyastenus hilgendorfi (Decapoda: Brachyura: Majoidea: Epialtidae) from the Suez Canal, Egypt Author Osman, Marwa M. Author Sallam, Wafaa S. Author Madkoura, Fedekar F. Author Wicksten, Mary K. text Journal of Natural History 2021 2021-11-10 55 33 - 34 2047 2064 journal article 3299 10.1080/00222933.2021.1973132 9d69522b-dc11-4e0b-b6d4-65e7e7dcf9e7 1464-5262 5727780 Hyastenus hilgendorfi (De Man, 1887) The carapace of H. hilgendorfi is distinguished by the presence of clusters of spinules located only on the orbital regions ( Figure 4 (a)). Each cluster comprises 27–55 short, tooth-shaped spinules with pointed tips ( Figure 4 (b)). Nine setal forms belonging to three main types (hooked, pappose and cuspidate) and a novel one (frilled spatulate setae) were found and photographed. No distinct differences were observed among size ranges for males or for females. A description is given for each setal type /form encountered, including average widths and lengths, presence of substructures and their average lengths as well as areas of the integument where the setal type was mainly encountered. No pores were present on any of the described forms. All setal types showed infracuticular articulation.