scholarly journals Ergasilussalmini sp. nov. (Copepoda: Ergasilidae) a branchial parasite of "dourado", Salminus franciscanus from the upper São Francisco River, Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 555-557 ◽  
Author(s):  
Vernon E. Thatcher ◽  
Marilia C. Brasil-Sato
Keyword(s):  
New Species ◽  
Abdominal Segment ◽  
River System ◽  
Thoracic Segment ◽  
South American ◽  
South American Species ◽  
Sao Francisco River ◽  
The Third ◽  
São Francisco River ◽  
Minas Gerais State

Ergasilus salmini sp. nov. a branchial parasite of the "dourado", Salminus franciscanus Lima & Britski, 2007, from the upper São Francisco river, Minas Gerais State, Brazil, is described based on female specimens. The new species has a serrate, curved seta on the first exopod as do most of the known South American species of the genus. Other than that, it does not closely resemble any known species of this genus. Many of the known ergasilids have head, and first two thoracic segments completely fused to form a cephalothorax. In the new species, the head is incompletely fused, the first thoracic segment is fused, but thoracic segment two is free. Ergasilus hydrolycus Thatcher, Boeger & Robertson, 1984, also has a free second thoracic segment but in that species the head is completely fused and the third abdominal segment is the longest. In the new species, the third segment is the shortest of the three. Also, the new species is smaller averaging 691 x 207 µ m compared to 784 x 278 µ m for E. hydrolycus. The latter species has a two-segmented fourth endopod whereas in the new species this structure is three-segmented. In addition, the new species is from a different host and a separate river system.

On the recent Cyclocypridinae (Podocopida, Candonidae) with description of two new genera and one new species

Zootaxa ◽  
2011 ◽  
Vol 2820 (1) ◽  
pp. 1 ◽  
Author(s):  
IVANA KARANOVIC
Keyword(s):  
New Species ◽  
Type Species ◽  
Terminal Segment ◽  
Extensive Study ◽  
South American ◽  
New Genera ◽  
South American Species ◽  
The Third ◽  
South Wales ◽  
One New Species

The recent representatives of the subfamily Cyclocypridinae Kaufmann, 1900 are revised here, based on some newly collected Australian material, as well as an extensive study of type material of already described species deposited in various museums. The following two new genera are proposed: Kempfcyclocypris gen. nov. and Keysercypria gen. nov. The genus Kempfcyclocypris is erected to include single new species from subterranean waters of New South Wales, Australia. Kempfcyclocypris australis gen. et sp. nov. can be distinguished from other members of the subfamily by the following characters: 6-segmented antennula, absence of the sexual bristles on antenna, weakly asymmetrical prehensile palps, absence of the basal seta on the second thoracopod, and the long distal seta on the penultimate segment of the third thoracopod. Keysercypria is erected to include some South American species previously described in the genera Physocypria Vávra, 1897 or Cypria Zenker, 1854. The main characters of this genus are: rather globular carapace, with or without marginal tubercles; very short setae on endopodal segments of the third thoracopod; unequally long setae “h1” and “h2” on the terminal segment of the same appendage; and the presence of the basal seta on the second thoracopod. Keysercypria affinis (Klie, 1933) comb. nov. is chosen as the type species and, together with K. deformis (Klie, 1940) comb. nov., K. longiseta (Klie, 1930) comb. nov., K. obtusa (Klie, 1940) comb. nov., and K. pellucida (Sars, 1901), redescribed in the present paper and lectotype and paralectotype are designated. After examining and redescribing the type species of the genus Physocypria Vávra, 1897, P. bullata Vávra, 1897, the genus Mecynocypria Rome, 1962 is synonymised with Physocypria. Lectotype of P. bullata is here designated. For each valid genus a diagnosis, a key to species and a distribution map are provided. A list of six genera and 87 species, currently belonging to the subfamily Cyclocypridinae, is given at the end of the paper, along with their synonyms. Twenty four species are not included in the keys due to lack of data; these are also listed at the end of the paper.

Gamidactylus piranhus sp. nov. (Copepoda, Vaigamidae) from the nasal fossae of serrasalmid fishes from the Três Marias Reservoir, Upper São Francisco River, Minas Gerais State, Brazil

2008 ◽  
Vol 53 (3) ◽  
Author(s):  
Vernon Thatcher ◽  
Michelle Santos ◽  
Marilia Brasil-Sato
Keyword(s):  
New Species ◽  
San Francisco ◽  
Type Species ◽  
Antennal Segment ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
Simple Seta ◽  
Três Marias Reservoir

AbstractGamidactylus piranhus sp. nov. (Copepoda, Vaigamidae) from the nasal fossae of “San Francisco piranha”, Pygocentrus piraya (Cuvier, 1819) and.White piranha. Serrasalmus brandtii (Lütken, 1875) is described. The new species is similar to the type species of the genus, Gamidactylus jaraquensis Thatcher et Boeger, 1984, but differs from it in the following respects: the cephalothorax is shorter, the free thoracic segments are usually longer, leg 5 is reduced to a simple seta and a spine on the second antennal segment is lacking. Gamidactylus bryconis Varella, 1995 and Gamidactylus hoplius Varella et Malta, 1996, do not closely resemble the new species because they are much larger and both present leg 5 reduced to a double seta.

Brasergasilus bifurcatus sp. nov. (Copepoda, Ergasilidae, Abergasilinae) from the gills and nasal fossae of serrasalmid fishes from the Três Marias Reservoir, Upper São Francisco River, Minas Gerais State, Brazil

2007 ◽  
Vol 52 (3) ◽  
Author(s):  
Michelle Santos ◽  
Vernon Thatcher ◽  
Marilia Brasil-Sato
Keyword(s):  
New Species ◽  
Distal Segment ◽  
Minas Gerais ◽  
Terminal Segment ◽  
Sao Francisco River ◽  
Genital Complex ◽  
São Francisco River ◽  
Minas Gerais State ◽  
Três Marias Reservoir

AbstractBrasergasilus bifurcatus sp. nov. (Copepoda, Ergasilidae, Abergasilinae) is described. Specimens of the new species were collected from the gills and nasal fossae of the serrasalmid fishes, known as “piranhas”, Pygocentrus piraya (Cuvier, 1819) and “pirambebas”, Serrasalmus brandtii (Lütken, 1875). The fishes were netted in the Três Marias Reservoir (18°12′59″S, 45°17′34″W) of the upper São Francisco River, Minas Gerais State, Brazil. The new species differs from its congeners by the following characters: the specific setation on the antennule; the terminal barb of the antenna; the deeply bifurcate distal segment of the mandible; the chalice-shaped genital complex; a conspicuous external indentation of the second segment of the first endopod and a very short terminal segment of the first exopod.

Certain species of Plecoptera from the headwater springs of National Integration River (São Francisco), Brazil

Zootaxa ◽  
2018 ◽  
Vol 4429 (1) ◽  
pp. 195
Author(s):  
MARCOS CARNEIRO NOVAES ◽  
DIOGO SILVA VILELA ◽  
VINICIUS MARQUES LOPEZ ◽  
RHAINER GUILLERMO NASCIMENTO FERREIRA
Keyword(s):  
New Species ◽  
National Park ◽  
Minas Gerais ◽  
Southeastern Brazil ◽  
National Integration ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
A New Species

Specimens of Anacroneuria Klapálek 1909 (Plecoptera: Perlidae) and Tupiperla Froehlich 1969 (Plecoptera: Gripopterygidae) from the headwater springs of the National Integration River (São Francisco River), Serra da Canastra National Park, in Minas Gerais State, of southeastern Brazil, were studied. A new species, Anacroneuria saofrancisco n. sp. is described and the descriptions of the nymph and the female of A. saofrancisco are also presented. 

scholarly journals Ergasilus chelangulatus sp. nov. (Copepoda: Ergasilidae) a branchial parasite of the freshwater catfish, Pimelodus maculatus from the upper São Francisco River, Brazil

2008 ◽  
Vol 25 (3) ◽  
pp. 512-514 ◽  
Author(s):  
Vernon E. Thatcher ◽  
Marilia C. Brasil-Sato
Keyword(s):  
New Species ◽  
Freshwater Fish ◽  
Antennal Segment ◽  
Minas Gerais ◽  
The Body ◽  
Freshwater Catfish ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
Pimelodus Maculatus

Ergasilus chelangulatus sp. nov. is described from the freshwater fish, Pimelodus maculatus Lacépède, 1803 (Siluriformes: Pimelodidae) of the upper São Francisco River, Minas Gerais State, Brazil. The new species is based on female specimens and the male is unknown. This species has a serrate seta on exopod one and a two-segmented first endopod, as do most Amazonian species of this genus. The body is elongate and produced anteriorly. The antennae are elongate and have prominent sensilla on segments two and three. Ergasilus chelangulatus sp. nov. can be distinguished from all known species of Ergasilus by the fourth antennal segment (claw) which is bent at nearly a right angle.

Salacia fugax, an elusive new South American Salacioideae (Celastraceae)

Phytotaxa ◽  
2017 ◽  
Vol 317 (4) ◽  
pp. 292 ◽  
Author(s):  
JULIO ANTONIO LOMBARDI ◽  
MARCELA SERNA GONZÁLEZ
Keyword(s):  
New Species ◽  
New South ◽  
Leaf Shape ◽  
Fruit Size ◽  
Leaf Size ◽  
South American ◽  
South American Species ◽  
Size And Shape ◽  
Fruit Size And Shape

A new South American species of Salacia (Celastraceae, Salacioideae) found in Colombia and Venezuela, Salacia fugax Lombardi & M.Serna is described here. It is characterized by its indument, small long acuminate leaves with short petioles, branched inflorescences, flowers with an annular-pulvinate disk, and small pyriform fruits. This new species resembles S. mennegana J.Hedin ex Lombardi and S. opacifolia (J.F.Macbr.) A.C.Sm. by its short petioles, leaf shape, slender branched inflorescence, perianth form, and similar disc, but S. fugax differs by its hairs, leaf size and apex, calyx, and fruit size and shape.

scholarly journals Environmental factors and benthic Oligochaeta (Annelida, Clitellata) assemblages in a stretch of the Upper São Francisco River (Minas Gerais State, Brazil)

2011 ◽  
Vol 71 (2) ◽  
pp. 437-446 ◽  
Author(s):  
AL Suriani-Affonso ◽  
RS França ◽  
M. Marchese ◽  
O. Rocha
Keyword(s):  
Size Composition ◽  
Abundant Species ◽  
Nitrogen And Phosphorus ◽  
Sao Francisco River ◽  
Limnodrilus Hoffmeisteri ◽  
São Francisco River ◽  
Data Variability ◽  
Numerical Abundance ◽  
Minas Gerais State ◽  
Dry Seasons

The Oligochaeta forms an important part of the macroinvertebrates inhabiting sediments of lotic ecosystems. It has an important role in the cycling of matter and energy transfer in these environments. The aim of this study is to analyse limnological variables, their influence on the structure and diversity of benthic oligochaete taxocenosis in a stretch of the Upper São Francisco River and its tributary the Piumhi River. Samples were taken in two climatic periods, the dry season in October 2006 and 2007 and the rainy season in March 2007 and 2008 at three points along the Piumhi River and six points along the São Francisco River. The sediment of the São Francisco consisted predominantly of sand and clay, whereas the sediment of the Piumhi was mainly sandy. Six species of oligochaete occurred in the Piumhi River while seven were found in the São Francisco. Of these, Pristina synclites Stephenson, 1925, Pristina americana Cernosvitov, 1937, Bothrioneurum sp. Stolc, 1888 and Limnodrilus hoffmeisteri Claparede, 1862 occurred in the sediment of both rivers. L. hoffmeisteri showed the highest numerical abundance in the Piumhi River and Brinkhurstia americana (Brinkhurst, 1964) and L. neotropicus Cernosvitov, 1939 were the most abundant species in the São Francisco River. The highest oligochaete density was recorded in the Piumhi during the dry seasons. Canonical correspondence analyses (CCA) of sediment characteristics explained most of the data variability and the association of the presence of oligochaete species in the Piumhi and São Francisco Rivers with the limnological variables (grain size composition and total nitrogen and phosphorus concentrations in the sediment).

Hysterionica chamomilloides (Asteraceae: Astereae) a new species from the grassland ecosystem of Río de La Plata

Phytotaxa ◽  
2021 ◽  
Vol 482 (1) ◽  
pp. 36-44
Author(s):  
LEONARDO PAZ DEBLE
Keyword(s):  
New Species ◽  
Conservation Status ◽  
Morphological Description ◽  
Similar Species ◽  
South American ◽  
Review Of Literature ◽  
South American Species ◽  
Field Surveys ◽  
Mountainous Regions ◽  
A New Species

Hysterionica s.l. (including Neja) comprises ca. 15 species distributed mainly in the grasslands of southern Brazil, Uruguay, central and northern Argentina and Southern Paraguay. Based on field surveys, study of nomenclatural types and other specimens, and review of literature, a new species is proposed here, Hysterionica chamomilloides, endemic of mountainous regions of northern Uruguay, and southwestern Rio Grande do Sul state, Brazil. This work provides a detailed morphological description of the new species, information on its geographic distribution, habitat, phenology, conservation status, and discusses the main differences between H. chamomilloides and the morphologically most similar species. Illustrations, images and a key to the South American species of Hysterionica are also supplied.

scholarly journals New species and records of Psocoptera (Insecta) from Roraima State, Brazil.

1991 ◽  
Vol 21 (0) ◽  
pp. 211-317 ◽  
Author(s):  
Edward L. Mockford
Keyword(s):  
New Species ◽  
South American ◽  
South American Species ◽  
Parallel Development ◽  
A New Species

Psocoptera. from Ilha de Marcica and Pacaraima, Roraima State, Brazil, representing 103 species are recorded. Sixty-two are new to science. and are described and figured, representing genera Echmepteryx(2), Tapinella(3), Musapsocus, (1), Seopsocus(3),Isth-mopsocis(3), Dolabellopsocus(6), Epipsocus(5), Neurostigma.(1), Nctiopscus(1), Cae-cilius (6) , Enderluinella (1), Xanthocarcilius(1) , Polypsocus(3) , Scytopsocus(1), ar-chipsocus(1), Lachesilla(4), Notolachesilla(1) , Perispsocus(4), Dactylopsocus (1) , Metylophorus(3), Blaste.(4), Lichenomiae(3), Myopsocus (3). Genus Notarchispsu. gen. is erected for Archipsocus macrurusNew and a new species. Genus MonocladellusEu-derlein in placed in synonymy of, PolypsocusHagen. South American species assigned to genus LophopterygllaEnderlein by New (1979) are. reassigned to Myopscus and represent a parallel development in the latter genus.

Comparative anatomy of the gut of the South American species of Amitermes, with description of two new species and an identification key based on soldiers and workers

Zootaxa ◽  
2020 ◽  
Vol 4751 (1) ◽  
pp. 75-104
Author(s):  
MAURICIO M. ROCHA ◽  
ELIANA M. CANCELLO
Keyword(s):  
New Species ◽  
South America ◽  
Geographic Distribution ◽  
Comparative Anatomy ◽  
Distribution Patterns ◽  
South American ◽  
The South ◽  
South American Species ◽  
Two New Species ◽  
First Time

In this contribution we present updates on the taxonomy and morphology of the South American species of Amitermes. Two new species are described: Amitermes bandeirai, sp. n., from Brazil, and Amitermes lilloi, sp. n., from Argentina. Amitermes nordestinus is a junior synonym of Amitermes aporema. The imago of A. aporema is described for the first time. Detailed comparative gut anatomy of the eight species is presented for the first time. The geographic distribution of Amitermes in South America is expanded and the distribution patterns of some species are discussed. 

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