There was a positive relationship between S. dimorphus specimens occupied gastropod shells. bouvieri inhabited carcinoecia, while 3.39% (n = 38) of S. bouvieri males were positively allometric, and negatively allometric in P. The lengths of the major right chelipeds of both S. The proportion of males of both species increased with cephalothoracic shield length (CL). dimorphus had a female‐biased sex ratio of 1:1.5, and P. bouvieri derived from demersal research trawl surveys were examined to investigate parameters of population structure, carcinoecia association and morphology. The parapagurid hermit crabs Sympagurus dimorphus (Studer, 1883) and Parapagurus bouvieri (Stebbing, 1910) form dominant components of South African deeper‐water benthic invertebrate communities and, as adults, forego the use of “traditional” gastropod shells in favour of symbiotically associated Epizoanthus carcinoecia. In addition, the relatively homogeneous nature of this refuge does not seem to influence the growth of the hermit crab, which presents sexual dimorphism in relation to the sex/size conditions. Its density tended to decrease over the five-year sampling period regarding the recruitment of hermits associated with colonies of zoanthids. This species presents a patchy distribution along the shelf-break of Argentina. To the best to our knowledge, this is the first report on population features and relative growth for a member of the genus, based on long-term sampling. The species also showed asymmetry, with the left uropod always larger than the right one. dimorphus is a dimorphic species, as evidenced by the larger size of the males and the positive allometric growth of the right cheliped. The sex ratio size class pattern corresponded to Type IV or anomalous curve. The smallest ovigerous female measured 6 mm in cephalothoracic shield length and this size was used as parameter to define the size of juveniles. dimorphus was commonly found from 40ºS to lower latitudes, in a patchy distribution along the shelf-break front.
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dimorphus living in symbiosis with Epizoanthus paguricola from a series of samples taken in the Argentine Sea, south-western Atlantic Ocean. In the present study, we analysed some population features of S. Despite the high abundance registered in some scallop fishing grounds, its biology remains little known. Sympagurus dimorphus is one of the 12 hermit crab species recorded for Argentinean waters.
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