Information detection affects physiological performance and behaviour and is vital to survival and fitness. Despite the recognised importance of sensory adaptations, many forms of sensory variation remain underexplored. To better understand the role of information in evolution, it is important to examine sensory variation as part of a cohesive framework of sensory diversity. Using the decapod claw, a structure well‐recognised for its morphological variation, we investigated sensory diversity at the intraspecific level by assessing heterochely and sexual dimorphism in the chelar morphologies of Pagurus bernhardus hermit crabs. We employed a novel methodology using scanning electron microscopy to assess chelar tissue from both the major and minor claws. Chelar shape, size, and distribution and abundance of sensilla (sensory hairs) were examined using geometric morphometric landmark analysis, generalised Procrustes analysis, and linear mixed-effects models. Hermit crabs showed heterochely and sexual dimorphism in both gross and sensory morphologies. Sexual dimorphism was greater in the sensory morphology of the major claw, suggesting sex‐based sensory specialisations, likely due to differences in mating roles and behaviours. In contrast, the minor claw's sensory morphology lacked sexual dimorphism, suggesting the sensory role of this appendage is equally important for both sexes. Our results highlight sensory variation as a fundamental aspect of functional morphology and emphasise the need to consider sexual dimorphism and body asymmetry in information acquisition. Our findings contribute to a broader framework for studying sensory sexual dimorphism, underscoring the importance of integrating sensory morphology, function, and ecology to fully understand the evolutionary implications of sensory specialisations.