Mesocyclops ogunnus Onabamiro 1957 (Crustacea: Copepoda: Cyclopoida): First report for northeastern Brazil (original) (raw)
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Journal of Crustacean Biology, 2003
Among several other cases of taxonomic indefinition within the cyclopoid copepod genus Mesocyclops, we selected and examined in detail two neotropical species with overlapping distributional ranges: M. meridianus (Kiefer, 1926) and M. brasilianus Kiefer, 1933. The latter has long been considered as a synonym of M. meridianus by some authors, while other specialists recognize both forms as valid. The available descriptions were not detailed enough to determine the taxonomic status of the two. Upgraded descriptive standards, including SEM analysis, were used in order to provide morphological data for both species, emphasizing microcharacters. After examination and comparison of both male and female specimens collected in several neotropical areas (Mexico, Peru, Brazil, Venezuela), we confirmed that M. brasilianus and M. meridianus are in fact valid, separate taxa. This statement was based on previously undetected differences in the ornamentation of the antennules, antennal basis, maxillulae, maxillae, and swimming legs 3 and 4, among other structures. A detailed complementary description and depiction of both species is provided herein. Males of both species are described in full for the first time. This kind of analysis is expected to mark new standards and to become a major tool in redefining the species limits of the neotropical Mesocyclops. Currently, the accurate identification of freshwater cyclopoid copepod species is difficult because of their morphological plasticity (Korovchinsky, 2000). This is particularly true in Mesocyclops. Studies emphasizing microcharacters (Holynska, 2000b) have shown that some of these, i.e., the shape of the seminal receptacle, the ornamentation of the coxa and basis of the fourth swimming leg, and the ornamentation of the antennal basis, among other characters, are useful to establish reliable limits among the species of Mesocyclops (see Kiefer, 1981; Van de Velde, 1984; Fiers and Van de Velde, 1984). Some of these characters have been used to describe species from the Old World (Kiefer, 1981; Van de Velde, 1984; Holynska, 2000b). Conversely, the taxonomic history of most neotropical species of Mesocyclops is plagued by descriptions that are inadequate for subsequently recognizing the same taxon (Gutiérrez-Aguirre and Suárez-Morales, 2001). There is a long-standing confusion between two neotropical nominal species, M. meridianus (Kiefer, 1926) and M. brasilianus Kiefer, 1933. The status of these two taxa is uncertain; some authors have considered the latter as a synonym of M.
Revista Peruana de Biología, 2021
© Los autores. Este artículo es publicado por la Revista Peruana de Biología de la Facultad de Ciencias Biológicas, Universidad Nacional Mayor de San Marcos. Este es un artículo de acceso abierto, distribuido bajo los términos de la Licencia Creative Commons Atribución 4.0 Internacional. (https://creativecommons.org/licenses/by/4.0/deed.es) que permite Compartir (copiar y redistribuir el material en cualquier medio o formato), Adaptar (remezclar, transformar y construir a partir del material) para cualquier propósito, incluso comercialmente. Journal home page: http://revistasinvestigacion.unmsm.edu.pe/index.php/rpb/index Revista peruana de biología 28(2): e20469 (Mayo 2021) doi: http://dx.doi.org/10.15381/rpb.v28i2.20469 ISSN-L 1561-0837; eISSN: 1727-9933 Universidad Nacional Mayor de San Marcos Nota científica
1987
Eight species of cyclopoid copepods were recorded from 1979-1983 in the complex microhabitats of a wet campo (campo umido) marsh in central Brazil. Ectocyclops herbsti and Paracyclops fimbriatus occurred most often in areas with water covering the soil; Muscocyclops therasiae n. sp. occurred mainly in soils with no surface water; while Metacyclops campestris n. sp. showed no distinct microhabitat preference. Occur-rence of the remaining four species was too sporadic to determine microhabitat preference. Paracyclops carec-tum n. sp., Metacyclops campestris n. sp., Muscocyclops therasiae n. sp., Muscocyclops bidentatus n. sp. and Ponticyclops boscoi n. g. n. sp. are described. A key to the New World species of Metacyclops s. str. is provid-ed.
Journal of Natural History, 2006
In this work we present an analysis of upgraded characters used in the taxonomy of cyclopine copepods to provide a new key for the identification of the members of the freshwater genus Mesocyclops recorded in the neotropical region. This analysis, which included revision of type and museum specimens, resulted also in the clarification of the taxonomical status of two nominal species not previously revised, M. varius Dussart, 1987 and M. venezolanus Dussart, 1987. These two species are recognized herein as junior synonyms of M. brasilianus Kiefer, 1933. Considering the addition of new records (introduced Afro-Asian or Asian forms), the designation of M. araucanus Campos et al., 1974 to species rank, and the conflict of determining the taxonomical status of M. annulatus diversus, the number of taxa recognized in the region includes 20 species and one variety. A general morphological analysis of the Old and New World species allowed us to contrast and evaluate some of the differential characters of these two groups. We propose several characters that can be considered as potentially valuable to separate reliably both female and male specimens of the neotropical species. The distribution of selected species or species groups of Mesocyclops is also revised in light of this new frame.
An Afro-Asian Species of Mesocyclops (Copepoda: Cyclopoida) in Central America and Mexico
Journal of Crustacean Biology, 2003
The presence of populations of the Afro-Asian cyclopoid copepod crustacean Mesocyclops thermocyclopoides Harada, 1931, in southeastern Mexico and in Central America is recorded. This species was recently redescribed in detail from Old World specimens. Because of the rarity of cosmopolitan forms in Mesocyclops, neotropical records of this species were suspected to be undescribed taxa of a widespread species complex. However, it was possible, through an upgraded morphological analysis and taxonomic comparison, to confirm the occurrence of M. thermocyclopoides in the neotropics. The American specimens are described in full. In the Americas, this species seems to be distributed in Mexico and Central America only. This is the third or fourth Asian or African species of the genus that has apparently been introduced into the New World by human agency. The others are M. pehpeiensis, M. ogunnus, and M. aspericornis.
The cyclopoid copepods of a wet campo marsh in central Brazil
Hydrobiologia, 1987
Eight species of cyclopoid copepods were recorded from 1979-1983 in the complex microhabitats of a wet campo (campo umido) marsh in central Brazil. Ectocyclops herbsti and Paracyclops fimbriatus occurred most often in areas with water covering the soil; Muscocyclops therasiae n. sp. occurred mainly in soils with no surface water; while Metacyclops campestris n. sp. showed no distinct microhabitat preference. Occurrence of the remaining four species was too sporadic to determine microhabitat preference. Paracyclops carectum n. sp., Metacyclops campestris n. sp., Muscocyclops therasiae n. sp., Muscocyclops bidentatus n. sp. and Ponticyclops boscoi n. g. n. sp. are described. A key to the New World species of Metacyclops s. str. is provided.
An Afro-Asian Species of Mesocyclops (Copepoda: Cyclopoida)
2003
The presence of populations of the Afro-Asian cyclopoid copepod crustacean Mesocyclops thermocyclopoides Harada, 1931, in southeastern Mexico and in Central America is recorded. This species was recently redescribed in detail from Old World specimens. Because of the rarity of cosmopolitan forms in Mesocyclops, neotropical records of this species were suspected to be undescribed taxa of a widespread species complex. However, it was possible, through an upgraded morphological analysis and taxonomic comparison, to confirm the occurrence of M. thermocyclopoides in the neotropics. The American specimens are described in full. In the Americas, this species seems to be distributed in Mexico and Central America only. This is the third or fourth Asian or African species of the genus that has apparently been introduced into the New World by human agency. The others are M. pehpeiensis, M. ogunnus, and M. aspericornis.
Crustaceana, 2001
The distributional and taxonomic status of the copepod genus Mesocyclops G. O. Sars, 1914, known from tropical America, is revised. Currently, the main characters to recognize species (i.e., presence/absence of a spine on the basipodite of the rst trunk limb, the presence/absence of teethlike projections on the intercoxal sclerite of the fourth trunk limb, and the shape of the seminal receptacle) have not been strong enough to make a clear, con dent taxonomic border between morphologically similar species. This is most evident in species belonging to the M. thermocyclopoides, the M. meridianus-brasilianus, and the M. reidae-ellipticus groups. Although some species qualify as Pantropical, Neotropical, endemic, and transitional forms, it is necessary to increase collection efforts and evaluate other morphological features in order to establish the taxonomic limits within these intrincate species groups as well as to determine the real distributional range of each. RESUMEN Se revisa el estado de conocimiento taxonómico y distribución de las especies de Mesocyclops G. O. Sars, 1914 conocidas en América tropical. Actualmente, las características morfológicas para diferenciar entre especies (vg. presencia/ausencia de una espina sobre el basipodito de la primera pata torácica, presencia/ausencia de proyecciones con forma de diente sobre el esclerito intercoxal de la cuarta pata torácica y la forma del receptáculo seminal), no han sido su cientes para marcar un límite taxonómico con able entre especies morfológicamente similares. Esto es más evidente en las especies que pertenecen a los grupos M. thermocyclopoides, M. meridianus-brasilianus y M. reidae-ellipticus. Por otro lado, aunque algunas especies son cali cadas como formas Pantrópicas, Neotrópicas, endémicas y de transición, es necesario incrementar los esfuerzos de colecta y evaluar otras características morfológicas con el n de establecer límites taxonómicos más claros dentro de los grupos de especies antes señalados, así como determinar los ámbitos reales de distribución de cada una.
Two new species ofHalicyclops (Copepoda, Cyclopoida) from the Amazon Basin, Brazil
Hydrobiologia, 1995
Two new species of Halicyclops are described from plankton samples taken in two localities in the Amazon River mouth area, State of Para, Brazil. Halicyclops lindbergi sp .n. resembles H. hurlberti and H. clarkei from which it differs by a combination of characters in leg 5, the anal pseudoperculum and the caudal rami. The other new species, H. dussarti, is most morphologically similar to H. pilosus, but they are separated by differences in legs 1 and 5 as well as in the ornamentation of the middle caudal setae .