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Thulin's redesignation of specimens originally identified as Bathyechiniscus tetronyx as Styraconyx sargassi is shown to be in error. By possessing pedestalate bases to lateral cirri and clavae, these organisms fail to qualify for the generic distinction of Styraconyx.
S. sargassi is therefore designated as a junior synonym of B. tetronyx. Since described features of S. paulae Robotti, 1971 did not differ significantly from those of S. sargassi, it is also designated a junior synonym of B. tetronyx. B. craticulus n. sp. is
distinguished from B. letronyx by its corrugated dorsal cuticle and the presence of a common sheath surrounding the clavae and lateral cephalic cirri. Since S. hallasi Kristensen, 1977 is more similar to Bathyechiniscus than to Styraconyx, it is reassigned as another
species of Bathyechiniscus.
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