Conidophrys fucatum Conidophrys C. fucatum Conidophrys guttipotor Chatton et Lwoff, 1936 Sphaeroma serratum (Fabricius, 1787) C. fucatum Conidophrys guttipotor S. serratum C. fucatum J. falcata C. guttipotor C. guttipotor C. guttipotor C. guttipotor Conidophrys Jaera albifrons Leach, 1814 C. guttipotor Conidophrys C. guttipotor Conidophrys jaerae M. jaerae Jankowski, 2007 Conidophrys Gammarus oceanicus Segerstråle, 1947 Marinogammarus obtusatus (Dahl, 1938) Pagurus bernhardus Linnaeus, 1758 C. enkystotrophos Jankowski, 1966 G. oceanicus G. setosus Dementieva, 1931 C. enkystotrophos C. enkystotrophos C. pіtelkae Bradbury, 1975 C. pitelkae C. pіtelkae C. marinogammari Jankowski Conidophrys Marinogammarus obtusatus A taxonomic revision of order Pilisuctorida (Ciliophora, Apostomatia) with keys to the subordinate taxa Dovgal, Igor Mayén-Estrada, Rosaura Zootaxa 2015 4040 5 543 558 Chatton et Lwoff, 1934 Chatton et Lwoff 1934 [238,689,1124,1150] Kinetofragminophora Conidophryidae Conidophrys Protozoa Apostomatida 2 545 Ciliophora genus    Conidophrys fucatumis probably a widely distributed species, as it has been observed in different regions on representatives of various crustacean taxa ( Mohr and Leveque 1948; Moore 1981). Jankowski (2007)has recorded to  Conidophrysindividuals in the Atlantic and Pacific oceans, near Tierra del Fuego coast, and in the subantarctic waters attached to isopods, amphipods, decapods and mysids; Lynn (2008)reported to  C. fucatumon soil mites, an unusual host taxon. Other records for conidophryids corresponds to Ólafsdóttir and Svavarsson (2002)on deep-water isopod, and for amphipod  MelitapetronioiSenna et al., 2012 ( Chatterjee et al.2013). One further species,  Conidophrys guttipotor Chatton et Lwoff, 1936( Fig. 1E,F) from isopod crustacean  Sphaeroma serratum(Fabricius, 1787)from lagoon L’etang de Thau ( France) was described ( Chatton and Lwoff, 1936), whose trophont stage differs from  C. fucatumin size, has a thickened covering, and cell body is bent by ventral outward. According to Chatton and Lwoff (1936),  Conidophrys guttipotorfrom  S. serratumwere attached to short host secretory setae, the bottom of ciliate envelope formed an elongated stalk-like structure with numerous folds which completely covered the seta, which resembles the attachment to the short setae observed in  C. fucatum, in particular, from the amphipod crustacean  J. falcata, but without special stalk-like structure ( Fig. 1D). Moreover, Chatton and Lwoff (1936)reported that some individuals of  C. guttipotorwere attached to any point along the length of non-secretory setae ( Fig. 1F), concluding that conidophryid ciliates from isopods may have different mode of feeding than the species living on amphipods. However, we believed that its possible that some individuals were detached from host body accidentally and engaged to any host setae.  Jankowski (2007)considered  C. guttipotoras a valid species name, but he cited the figure of  C. guttipotorafter Chatton and Lwoff (1936), denoting the species as Mycodiniumsp. It should be noted that the mode of trophont attachment to host body in  C. guttipotoras well as some peculiarities of the morphology of species, are very similar to  Conidophryssp. found by Jones and Khan (1970)on isopod  Jaera albifronsLeach, 1814from Pembrokeshire (Black Tar Beach, Milford Haven, South Wales) ( Fig. 1G–I), but spite to some differences such as the different mode of attachment to the host, and the presence of a trophont stage with a permanent funnel-shaped opening ( Jones and Khan 1970), we believe this species can be previously identified as a  C. guttipotor, despite the trophont and tomite dimensions are missing, based on size of the macronucleus (and proportion to the cell), and well-defined longitudinal folds of stalk.  Jones and Khan (1970)also emphasized that Chatton and Lwoff (1936)described that some representatives of genus  Conidophrysattach to the host body with stalk-like structure, and argumenting that the stalk of the studied species (without any setae inside of stalk), is more similar to the stalks of suctorian and chonotrich ciliates, but  C. guttipotorwas not considered.  Jankowski (2007)(only in figure 373 on page 880) assigned the new name combination Mycodinium(=  Conidophrys)  jaeraeto conidophryid ciliate found by Jones and Khan (1970). However both the diagnosis or labeling "sp. n." were not provided. Hence the name  M. jaerae Jankowski, 2007is an unavailable in accordance with Article 16.1 of the International Code of Zoological Nomenclature (International ..., 1999).  Jankowski (1966a)reported the discovery of three new species of genus  Conidophryson intertidal crustaceans (  Gammarus oceanicusSegerstråle, 1947,  Marinogammarus obtusatus(Dahl, 1938)and hermit crab  Pagurus bernhardusLinnaeus, 1758) from the Barents Sea near village Dalnie Zelentsy. However, only the diagnosis of  C. enkystotrophosJankowski, 1966from  G. oceanicuswas published, but trophont figures were included later ( Jankowski 1972, 2007) ( Fig. 1J). Jankowski (2007)also recorded to  G. setosusDementieva, 1931from the same locality, as a host for  C. enkystotrophos. According to Jankowski (1966a),  C. enkystotrophosdiffers from other species of the genus by its attaching mode to the setae and its crimped band-like macronucleus. The ciliate is clamped parallel to the seta, whose tip is bent 180 degrees with respect its longitudinal axis. Bradbury (1975) described to  C. pіtelkaeBradbury, 1975from shrimps ( Fig. 1K–N), collected near Roscoff ( typelocality) and Penpoull ( France). The trophonts of the species vary from tiny tear-drop-shaped to long, slender forms. However, unlike to other representatives of the genus,  C. pitelkaeproduces only a single tomite; a long, serpentine, with fun-shaped distal widening macronucleus is characteristic for the species.  Bradbury and Tyson (1982)emphasize the ability of cyst in  C. pіtelkaeto grow with the ciliate cell body, due to the presence of short folds in the cyst walls formed during its secretion through tomite metamorphosis. Thereupon these folds are straightened during cell growth. Asthe growth of cyst and cell body has been reported in various pilisuctorid taxa ( Chatton and Lwoff 1936; Deroux et al.1975), we consider is a common process to all cystte Pilisuctorida. The new species name  C. marinogammariJankowski(in press) for  Conidophrysfrom  Marinogammarus obtusatuswas done by Jankowski (2007, p. 887). However this name is nomen dubiumbecause was not accompanied by species diagnosis or figure.