Simone Cohen - Academia.edu (original) (raw)

Papers by Simone Cohen

Zootaxa, 2006

Two hundred and ten species from Mexico, 155 from the Caribbean (Bahamas, Bermuda, Cuba, the Domi... more Two hundred and ten species from Mexico, 155 from the Caribbean (Bahamas, Bermuda, Cuba, the Dominican Republic, Guadeloupe, Jamaica, Puerto Rico and Trinidad) and 63 from Central America (Costa Rica, El Salvador, Guatemala, Nicaragua and Panama) with hosts and geographical distribution are listed in this contribution, bringing up to date the knowledge of Latin America monogenean fauna. A host parasite list with the monogenean species is presented.

Check List, 2009

Material collected from the fishes from the dams and fish farms of the Departamento Nacional de O... more Material collected from the fishes from the dams and fish farms of the Departamento Nacional de Obras contra as Secas (DNOCS) and from the tanks of the Itaipu Hydroelectric Station was examined in order to analyze the index and the infestation of Monogenea. Specimens of tambaqui (Colossoma macropomum), pacu (Piaractus mesopotamicus), pirapitinga (Piaractus brachypomus) and the hybrid tambacu (Colossoma macropomum X Piaractus mesopotamicus) were examined and five species of Monogenea were identified including: Mymarothecium viatorum Boeger, Piasecki & Sobecka, 2002, Mymarothecium boegeri Cohen & Kohn, 2005, Notozothecium euzeti Kritsky, Boeger & Jégu, 1996, Notozothecium januachensis Belmont-Jegu, Domingues & Martins, 2004 and Anacanthorus penilabiatus Boeger, Husak & Martins, 1995. Infection prevalence and intensity of infection and new data concerning Monogenea are presented. Key words: Monogenea, Parasites, Brazil, freshwater fishes.

Monogenoidea represents a class of hermaphroditic Platyhelminthes ecto-parasitic of mainly fishes... more Monogenoidea represents a class of hermaphroditic Platyhelminthes ecto-parasitic of mainly fishes. They inhabit the gills, skin, nasal fossae, ureters and some intestinal ducts. Brazil is known as a country with rich fauna, flora and mineral resources, with more than 4000 species of freshwater fishes, representing approximately 31% of the world freshwater fish species. Abou 365 species of Monogenoidea described from Brazil is listed. The International Symposium on Monogenea (ISM) represents the most traditional event for researchers worldwide that study this group of parasites. During the Sixth ISM, in South Africa, Brazil had being elected the next venue (ISM 7). This is the first time in American continent that will enable the participation of researchers and students of the whole continent.

REVISTA MEXICANA DE BIODIVERSIDAD

During a survey of the helminth parasites of Ctenosciaena gracilicirrhus from the Atlantic Ocean,... more During a survey of the helminth parasites of Ctenosciaena gracilicirrhus from the Atlantic Ocean, off Angra dos Reis, Rio de Janeiro State, Brazil, 10 species of metazoan parasites were collected: 1 species of Monogenea (Choricotyle rohdei); 3 species of Nematoda (Hysterothylacium sp. third stage larvae, Raphidascaris sp. third stage larvae, and Procamallanus (Spirocamallanus) pereirai third and fourth stages larvae and adults); 6 species of Digenea (Opecoeloides pedicathedrae, Opecoeloides melanopteri, Diplomonorchis leiostomi, Aponurus laguncula, Parahemiurus merus and Manteriella sp.). Choricotyle rohdei and Hysterothylacium sp. had the highest prevalence, mean intensity and abundance and an aggregated pattern of distribution was observed in both species. A positive correlation between the standard length of hosts and the parasitic abundance of Hysterothylacium sp. and C. rohdei was observed. The prevalence of C. rohdei was positively correlated with standard length of the host, ...

During examination on fish from markets in Chorrilos, Peru, a member of the genus Pseurhabdosynoc... more During examination on fish from markets in Chorrilos, Peru, a member of the genus Pseurhabdosynochus was found parasitizing Paranthias colonus (Valenciennes, 1846) (Perciformes, Serranidae). Pseudorhabdosynochus is unique among Diplectanidae by having quadriloculate male copulatory organ and the anterior rows of rodlets with closed rings. The genus is also characterized by a sclerotized vagina, which is the key structure for identifying species of Pseudorhabdosynochus. Species of Pseudorhabdosynochus Yamaguti, 1958 are found almost exclusively in groupers (Serranidae, Epinephelinae). These monogenean parasites are generally strictly specific and thus each species of grouper has its own fauna. From South America, only three species were described / reported: Pseudorhabdosynochus americanus (Price, 1937) Kritsky & Beverley-Burton, 1986 from Anablepsoides hartii (= Rivulus harti), Astyanax bimaculatus in Venezuela and from Brazil, Pseudorhabdosynochus beverleyburtonae (Oliver, 1984) Kr...

Brazilian Journal of Biology, 2002

Two species of Digenea were recorded for the first time in South America and in new hosts: Acanth... more Two species of Digenea were recorded for the first time in South America and in new hosts: Acanthostomum spiniceps (Looss, 1896) (Cryptogonimidae) was reported from Astroscopus sexspinosus (Steindachner, 1877) (Uranoscopidae) and Diplomonorchis sphaerovarium Nahhas & Cable, 1964 (Monorchiidae) from Ophichthus gomesi (Castelnau, 1855) (Ophichthidae). From the latter, Heliconema heliconema Travassos, 1919 (Nematoda, Physalopteridae), was also recovered representing also a new host for this nematode species.

Zootaxa, 2015

Six species of dactylogyrid monogenoideans were collected at the upper São Francisco River, State... more Six species of dactylogyrid monogenoideans were collected at the upper São Francisco River, State of Minas Gerais, Brazil, from the gills of Salminus franciscanus. Anacanthorus adkruidenieri sp. n. and Anacanthorus paradouradensis sp. n. are described and compared with the other species of Anacanthorus. Anacanthorus adkruidenieri sp. n. is more similar to A. kruidenieri and A. parakruidenieri, but it can be distinguished from both by the rod-shaped accessory piece, which is articulated with the base of the male copulatory organ and is coiled around it, and by the shank of the hook, with expanded proximal bulbous portion bearing a central, elliptical foramen. Anacanthorus paradouradensis sp. n. resembles A. douradensis, but differs in the accessory piece, which is approximately half the length of the copulatory organ. Salminus franciscanus is a new host record and the São Francisco Basin is a new locality record for Anacanthorus daulometrus, Annulotrematoides glossophallus, Jainus iocensis and Tereancistrum arcuatus.

Brazilian Journal of Biology, 2004

The ultrastructure of the body tegument of Metamicrocotyla macracantha (Alexander, 1954) Koratha,... more The ultrastructure of the body tegument of Metamicrocotyla macracantha (Alexander, 1954) Koratha, 1955, parasite of Mugil liza from Brazil, was studied by transmission electron microscopy. The body tegument is composed of an external syncytial layer, musculature, and an inner layer containing tegumental cells. The syncytium consists of a matrix containing three types of body inclusions and mitochondria. The musculature is constituted of several layers of longitudinal and circular muscle fibers. The tegumental cells present a well-developed nucleus, cytoplasm filled with ribosomes, rough endoplasmatic reticulum and mitochondria, and characteristic organelles of tegumental cells.

Parasite, 2015

Pseudorhabdosynochus jeanloui n. sp. (Monogenoidea, Diplectanidae) is described from specimens co... more Pseudorhabdosynochus jeanloui n. sp. (Monogenoidea, Diplectanidae) is described from specimens collected from the gills of the Pacific creolefish, Paranthias colonus (Perciformes, Serranidae) from a fish market in Chorrillos, Lima, Peru. The new species is differentiated from other members of the genus by the structure of its sclerotized vagina, which has two spherical chambers of similar diameter. This is the first Pseudorhabdosynochus species described from the Pacific coast of America, the third species of the genus reported from South America and the first described from a member of Paranthias.

Revista Brasileira de Parasitologia Veterinária, 2008

Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform f... more Eight known species of Demidospermus (Dactylogyridae, Monogenea) were collected from siluriform fishes from reservoir of the Itaipu Hydroelectric Power Station, Paraná, Brazil. Four of them are recorded for the first time in Brazil, enlarging their geographical distribution: Demidospermus armostus, Demidospermus anus, Demidospermus bidiverticulatum and Demidospermus valenciennesi. Demidospermus labrosi is synonymized with Demidospermus cornicinus and Demidospermus mandi with Demidospermus leptosynophallus and reported from two new hosts. Demidospermus paravalenciennesi and Demidospermus uncusvalidus were also collected.

Memórias do Instituto Oswaldo Cruz, 1995

Revista Brasileira de Parasitologia Veterinária, 2011

Gotocotyla acanthura (Parona & Perugia, 1896) Meserve, 1938 collected from the gills of Pomatomus... more Gotocotyla acanthura (Parona & Perugia, 1896) Meserve, 1938 collected from the gills of Pomatomus saltatrix from the coast of the state of Rio de Janeiro state was analyzed using scanning electron microscopy (SEM). The study demonstrated the presence of a buccal cavity, a genital atrium on the ventral surface and a muscular structure on the dorsal surface at the level of the body constriction. An elongated haptor with 80 to 120 pedunculated clamps symmetrically distributed in two rows, with rib-like thickenings and a curved lappet bearing a pair of hooks at the posterior extremity of the body were also observed. The cirrus could be seen protruding from the genital atrium, armed with pectinate spines along its length and presenting up to eight pointed spines around the genital atrium.

Memórias do Instituto Oswaldo Cruz, 1996

The tegument of the adult form of Prosorhynchoides arcuatus (Linton, 1900) (Trematoda, Bucephalid... more The tegument of the adult form of Prosorhynchoides arcuatus (Linton, 1900) (Trematoda, Bucephalidae) from the intestine of Pomatomus saltator (L.) from the Atlantic coast of the State of Rio de Janeiro, Brazil was studied by transmission electron microscopy. The tegument consists of two layers: an external, constituted by a syncytium, containing spines, unicilliated papillae, inclusion bodies and mitochondria and an internal, consisting of a muscular layer and mononucleated tegumental cells.

Memórias do Instituto Oswaldo Cruz, 2001

Ultrastructural observations of spermatogenesis and sperm development of Saccocoelioides godoyi, ... more Ultrastructural observations of spermatogenesis and sperm development of Saccocoelioides godoyi, an intestinal parasite of Leporinus friderici (Bloch, 1794) are described. The irregular-shaped spermatogonia form a peripheral layer, and show a prominent nucleus. Spermatocytes are larger than spermatogonia, and in the early stage present synaptonemal complex. Spermatids show nuclei smaller than the spermatocytes. Spermiogenesis is characterized by outgrowth of the zone of differentiation, presenting basal bodies, separated by an intercentriolar body. At the end of this process, the spermatozoa are released into the residual cytoplasmic mass. The spermatozoa of S. godoyi are elongate, similar to the pattern described for other Digenea, showing nuclei, mitochondria and two axonemes with the 9+1 configuration. The peripheral cortical microtubules on the dorsal and ventral faces are laterally interrupted.

The Journal of Parasitology, 1999

Ultrastructural observations of spermatogenesis and spermiogenesis in Microcotyle sp. a microcoty... more Ultrastructural observations of spermatogenesis and spermiogenesis in Microcotyle sp. a microcotylid monogenean parasite from the gills of Hypostomus sp., are described. The spermatogonia were irregularly shaped, forming a peripheral layer of cells; spermatocytes were larger than spermatogonia and a nuclear synaptonemal complex was observed; young spermatids were joined by a central cytophore forming rosettes. Spermiogenesis was characterized by the outgrowth of a cytoplasmic protuberance, the zone of differentiation, containing the basal bodies, separated by an intercentriolar body, from which flagella grow out and fuse posteriorly with the median process. Cross sections of the anterior and the middle regions of spermatozoa revealed nuclei, mitochondria, peripheral microtubules, and paired axonemes each with a 9+1 pattern.

Journal of Helminthology, 2001

The tegument of adult Saccocoelioides godoyi Kohn & Froes, 1986 (Digenea: Haploporidae), specimen... more The tegument of adult Saccocoelioides godoyi Kohn & Froes, 1986 (Digenea: Haploporidae), specimens of which were collected from the intestine of the freshwater fish, Leporinus friderici (Bloch, 1794) (Anostomidae) from the reservoir of Itaipu Hydroelectric Power Station, Parana State, Brazil, was studied by transmission electron microscopy. The tegument comprises an external anucleate layer, covered by a surface plasma membrane and associated glycocalyx. The surface layer is bound by the basal plasma membrane and contains spines, two types of inclusion bodies and mitochondria. Tegumental cell bodies are located beneath the surface musculature and contain a single nucleus, cytoplasm with rough endoplasmic reticulum, mitochondria, ribosomes, and inclusion bodies similar to those found in the external layer. Cytoplasmic strands connect the cell bodies to the external surface layer, suggesting that the inclusion bodies are produced in these cells and pass up into the syncytium, as is kn...

Japanese Heart Journal, 1983

Electron microscopic studies of chordae tendineae of the mitral valve were carried out in 17 pati... more Electron microscopic studies of chordae tendineae of the mitral valve were carried out in 17 patients who underwent mitral valve replacement due to a spontaneously isolated rupture of chordae tendineae. The normal chordae, used as the control group, were obtained at autopsy from 5 patients who died from extracardiac causes and were compared with the ruptured chordae. In all patients with chordal rupture, scanning electron microscopy showed perforations of the chordae tendineae, with extensive desquamation and disruption of the endothelial cells and widespread destruction of the collagen fiber bundles in the central collagenous core. These pathological findings were not observed in the normal chordae from the control group. Transmission electron microscopy showed that the ruptured chordae were characterized by heterogeneous collagen fibrils with intrinsic structural alterations and disorganization in fibril arrangement. There was a wide variation in the diameters of collagen fibrils which always showed abnormal morphology, with abnormally large, peculiarly shaped fibrils. Apparent loss and/or a disordered arrangement of the typical periodicity of the fibrils were frequently observed. In addition, various degrees of degenerative changes of collagen tissue were often present. These abnormalities were never seen in the fibrils of the normal chordae, and were observed consistently in both the fibrils of the ruptured chordae and in the macroscopically intact chordae in the group with spontaneous rupture of chordae tendineae. These results suggest that a defective organization of collagen into fibrils and fibers, associated with secondary degeneration of collagen within the central collagenous core of the chordae tendineae, are important pathogenetic mechanisms for spontaneously isolated ruptures of chordae tendineae.

Folia Parasitologica, 2000

Paranaella, a new microcotyline monotypic genus, is erected to accommodate Paranaella luquei sp. ... more Paranaella, a new microcotyline monotypic genus, is erected to accommodate Paranaella luquei sp. n., parasite of gill filaments from Hypostomus sp., Hypostomus regani (Ihering) and Rhinelepis aspera Spix et Agassiz (Loricariidae) from the Paraná River, Brazil. The new genus is most closely related to Microcotyle Van Beneden et Hesse, 1863, Diplostamenides Unnithan, 1971 and Solostamenides Unnithan, 1971. From Microcotyle it differs mainly by having the genital atrium formed by a muscular ring with a concentric row of numerous elongate and straight spines; from Diplostamenides it can be distinguished by the unarmed and not differentiated cirrus and from Solostamenides it differs by the single vaginal pore and absence of larval hooks.

Folia Parasitologica, 2005

Mymarothecium boegeri sp. n. (Monogenea: Dactylogyridae) is described from the gills of Colossoma... more Mymarothecium boegeri sp. n. (Monogenea: Dactylogyridae) is described from the gills of Colossoma macropomum Cuvier (Characidae), collected from the aquaria of the "Centro de Pesquisas em Aquicultura, Departamento Nacional de Obras Contra as Secas (DNOCS)", Pentecoste City, State of Ceará, Brazil. Mymarothecium viatorum Boeger, Piasecki et Sobecka, 2002 is reported from the type host, Piaractus brachypomus (Cuvier) (Characidae) and from a new host, P. mesopotamicus (Holmberg) (Characidae), confirming the occurrence of M. viatorum in the Neotropical Region. The new species differs from the congeneric species in the structure of male copulatory complex; it is more closely related to M. viatorum by the presence of a posteromedial projection on ventral bar.

This catalog lists species and figures of Monogenoidea parasites of fishes, amphibians and reptil... more This catalog lists species and figures of Monogenoidea parasites of fishes, amphibians and reptiles from South America. Six hundred and fifty one monogenoidean species have been recorded: 437 species from Brazil, 115 from Peru, 75 from Argentina, 44 from Venezuela, 40 from Chile, 23 from Falkland-Patagonian region, 17 from Colombia and 17 from Uruguay, 12 from Bolivia, 11 from Galapagos, 07 from Ecuador, 06 from French-Guyana, 04 from Guyana and from Paraguay each and 02 from Surinam. This survey is based on bibliographic sources and includes figures, hosts, geographical distribution and references