Bellactis ilkalyseae Dube, 1974 Bellactis ilkalyseae Dube, 1983 Morphological revision of the genus Aiptasia and the family Aiptasiidae (Cnidaria, Actiniaria, Metridioidea) Grajales, Alejandro Rodríguez, Estefanía Zootaxa 2014 3826 1 55 100 Dube, 1983 Dube 1983 [151,529,1335,1362] Anthozoa Sagartiidae Bellactis Animalia Actiniaria 30 85 Cnidaria species ilkalyseae    Bellactis ilkalyseae Dube, 1974( nomen nudum)  Bellactis ilkalyseae Dube, 1983    Bellactis ilkalysae[ sic]: Gasparini et al.2005 Material examined.(See Appendix 1).   Description. External anatomy( Fig. 17): Pedal disc to 10 mmdiameter in preserved specimens, wider than column. Column elongate, not divisible into regions, to 22 mmheight and to 10 mmdiameter in preserved specimens. Cinclides not numerous, in mid-column, in 3–4 rows ( Figs. 17B, D). Mesenterial insertions visible. Oral disc to 20 mmdiameter in preserved specimens. Tentacles to ~204, smooth, tapering toward tips, 2–3 mmlength in preserved specimens; irregularly arranged ( Fig. 17C).  Internal anatomy and microanatomy( Fig. 18): Marginal sphincter muscle mesogleal, diffuse, very weak, alveolar ( Fig. 18E). Mesenteries irregularly arranged in four cycles. First cycle perfect, with 7 pairs of mesenteries; second (6 pairs) and third (~28 pairs) cycles imperfect; fourth cycle only proximally. First and second cycles fertile, including directives. Two pairs of directives each associated with a siphonoglyph. Retractor muscles restricted ( Fig. 18A). Parietobasilar muscles poorly developed. Longitudinal muscles of tentacles ectodermal ( Fig. 18B). Relatively strong longitudinal ectodermal muscles in distal end of column ( Fig. 18B). Basilar muscles well differentiated, with fibers on short and thick mesogleal pennon ( Fig. 18D). Acontia very numerous, long and thick.  Color( Fig. 17): Living specimens with column whitish-translucent; tentacles with yellow tips, grey-bluish with irregular spots proximally ( Figs. 17A, B). Preserved specimens with uniform yellowish column and slightly darker tentacles ( Figs. 17C, B).  Cnidom:Spirocysts, basitrichs, microbasic b-mastigophores and p-amastigophores (Fig. 19). See Table 6 for size and distribution.   FIGURE 17.External anatomy of  Bellactis ilkalyseae. A, B) Oral and lateral view of living specimen. C) Oral view of preserved specimen; notice irregular arrangement of tentacles. D) Lateral view of preserved specimen; notice cinclides and acontia (arrows). Scale bars: A–D, 10 mm.   FIGURE 18.Internal anatomy of  Bellactis ilkalyseae. A) Cross section of the column at the level of the actinopharynx showing the cycles of mesenteries (indicated by roman numberals between pairs). B) Cross section through a tentacle showing the ectodermal longitudinal musculature; notice zooxanthellae in gastrodermis. C) Cross section through distal column showing the ectodermal longitudinal musculature. D) Detail of a longitudinal section of the proximal end showing the welldeveloped basilar muscles. E) Longitudinal section of the distal column showing weak mesogleal marginal sphincter muscle. Abbreviations: ep, epidermis; ga, gastrodermis; me, mesoglea. Scale bars: A–F, 0.1 mm.  FIGURE 19.Cnidae of  Bellactis ilkalyseae. A, C, F, I, K, L, N, O) Microbasic p-amastigophores. B, D, G, J, M, P) Basitrichs. E) Microbasic b-mastigophore. H) Spirocyst.  Geographic and bathymetric distribution.  Bellactis ilkalyseaeis distributed in the coast of Brazil( Fautin 2013). This is an intertidal species found between 0– 2 m.  Taxonomic remarks.  Bellactiswas originally placed within the family Sagartiidae ( Dube 1983). However, general external and internal anatomy (particularly the presence of ectodermal longitudinal muscle along distal column) and the cnidom correspond with those of Aiptasiidae. Our specimens agree well with the original description of the species ( Dube 1983) except in the mesogleal marginal sphincter. Dube (1983)described the marginal sphincter as strong, but our specimens show a very weak marginal sphincter muscle ( Fig. 18E). We modified the diagnosis of the genus to reflect this. In addition, Dube (1983)described the retractor muscles as diffuse and relatively weak whereas in our specimens these muscles are relatively strong and restricted.  TABLE 6.Size ranges of the cnidae of  Bellactis ilkalyseae. x, mean; SD, standard deviation; S, ratio of number of specimens in which each cnida was found to number of specimens examined; N, Total number of capsules measured; F, frequency; +++, very common; ++, common; +, rather common; Abbreviations: M, Microbasic.