scholarly journals Austrolebias queguay (Cyprinodontiformes, Rivulidae), a new species of annual killifish endemic to the lower Uruguay river basin

2018 ◽  
Vol 94 (2) ◽  
pp. 547-556 ◽  
Author(s):  
Wilson S. Serra ◽  
Marcelo Loureiro
Keyword(s):  
New Species ◽  
River Basin ◽  
Distal Portion ◽  
The Body ◽  
Annual Fish ◽  
Pectoral Fins ◽  
Bluish Green ◽  
Close Relationship ◽  
Uruguay River ◽  
A New Species

In this article we describe a new species of the annual fish genusAustrolebiasfrom the lower Uruguay river basin. The fusion of the urogenital papilla to the first anal fin ray in males and the pigmentation pattern, indicates a close relationship with the clade formed byA.bellottii,A.melanoorus, andA.univentripinnis. The new species can be differentiated from those by the following combination of characters: presence of well-defined light bands contrasting with the sides of the body, the distal portion of the anal fin dark gray, pelvic fins dark bluish green and bases united at about 50–80% on their medial margins, pectoral fins with iridescent blue sub-marginal band, and general coloration of body bluish green. The new species can only be found in wetlands of the Queguay river, an area included in the Uruguayan protected areas system and represents so far the only annual fish species endemic to the lower Uruguay river basin.

Poecilia (Pamphorichthys) akroa, a new poeciliid species (Cyprinodontiformes: Poeciliidae) from the Rio Tocantins basin, Brazil

Zootaxa ◽  
2018 ◽  
Vol 4461 (3) ◽  
pp. 438
Author(s):  
CARLOS AUGUSTO FIGUEIREDO ◽  
CRISTIANO R. MOREIRA
Keyword(s):  
New Species ◽  
Sensory System ◽  
Color Pattern ◽  
Distal Portion ◽  
The Body ◽  
Caudal Peduncle ◽  
Posterior Portion ◽  
Anterior Branch ◽  
Black Blotch ◽  
A New Species

A new species, Poecilia (Pamphorichthys) akroa, is described from the Rio Tocantins drainage, Brazil. The new species differs from the remaining species of the genus by the possession of 10 or 11 pectoral-fin rays, entire preopercular ramus and posterior portion of the supraorbital ramus of the cephalic sensory system enclosed in canals, a faint longitudinal band along the body, a single gonapophysis, a homogeneous reticulate color pattern on sides of body, urogenital region of females heavily pigmented, distalmost segments of the anterior branch (4a) of the fourth gonopodial ray fused into an elongated segment turned anteriorly, subdistal segments of anterior branch (5a) of fifth gonopodial ray simple, without anterior (ventral) projections, dorsal fin with pigmentation at its distal portion and with a basal black blotch, and chromatophores more concentrated on the posterior margin of the mid-ventral scale series of the caudal peduncle and ventrolateral margin of the adjacent scales forming a series of rhombi posterior to anal fin. 

scholarly journals Hyphessobrycon nicolasi (Teleostei: Characidae) a new species from the Uruguay River basin in the Mesopotamian Region, Argentina

2010 ◽  
Vol 8 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Amalia M Miquelarena ◽  
Hugo L López
Keyword(s):  
New Species ◽  
River Basin ◽  
Black Spot ◽  
Caudal Fin ◽  
Black Stripe ◽  
Fin Rays ◽  
Entre Rios ◽  
Uruguay River ◽  
A New Species

Hyphessobrycon nicolasi is described from the Uruguay River basin in the Mesopotamian Region, Entre Ríos, Argentina. The new species can be distinguished from all congeners by the presence of a well-defined oblique and marginal black stripe on each lobe of the caudal fin. Other characters defining H. nicolasi are the possession of 1-3 teeth with 3-10 cusps on maxilla; outer premaxillary row with 2-3 small teeth, with 5 or 7 cusps; iv-vi, 27-36 anal-fin rays; 33-36 scales on the longitudinal series; two vertical dark spots on the humeral region; dorsal and anal fins dappled in black and base of caudal fin bearing conspicuous black spot; and the presence of bony hooks on the rays of dorsal, anal and caudal fins of the mature males.

scholarly journals New species of Cetopsidium (Siluriformes: Cetopsidae: Cetopsinae) from the upper rio Branco system in Guyana

2009 ◽  
Vol 7 (3) ◽  
pp. 289-293 ◽  
Author(s):  
Richard P. Vari ◽  
Carl J. Ferraris Jr.
Keyword(s):  
New Species ◽  
River Basin ◽  
Amazon Basin ◽  
River System ◽  
The Body ◽  
Dna Barcodes ◽  
Pectoral Fins ◽  
Pelvic Fin

Cetopsidium soniae, new species, is described from the Takutu River basin of southwestern Guyana, within the upper portions of the rio Branco of the Amazon basin. The new species differs from its congeners in details of pigmentation, the length of the pelvic fin, the form of the first rays of the dorsal and pectoral fins in mature males, the relative alignment of the dorsal and ventral profiles of the postdorsal portion of the body, the position of the anus, and the depth of the body. DNA barcodes were generated for the holotype and paratype. An examination of other samples of Cetopsidium from the rio Branco system extends the range of C. pemon into the Ireng River system of Guyana.

scholarly journals A striking new species of Papuan groundsnake (Stegonotus: Colubridae) from southern Papua New Guinea, with a dichotomous key to the genus in New Guinea

Zootaxa ◽  
2021 ◽  
Vol 4926 (1) ◽  
pp. 26-42
Author(s):  
MARK O’SHEA ◽  
STEPHEN J. RICHARDS
Keyword(s):  
New Species ◽  
Papua New Guinea ◽  
River Basin ◽  
New Guinea ◽  
Temporal Scale ◽  
The Body ◽  
Colour Pattern ◽  
Dichotomous Key ◽  
Dark Pigmentation ◽  
A New Species

We describe a new species of groundsnake of the genus Stegonotus (Colubridae) from the Purari River basin in Gulf Province, Papua New Guinea. The new species can be most readily distinguished from all other New Guinean Stegonotus by its unique dorsal colour pattern which consists of a dark head and creamy-white anterior one third to two thirds of the body, grading into increasingly dense dark pigmentation on the posterior of the body and tail. It is most similar to S. iridis from the Raja Ampat Archipelago off western New Guinea, but that species has a different pattern of pigmentation dorsally, has a lower ventral scale count (198–211 vs. 229–239), and exhibits a different temporal scale arrangement. The description of S. aplini sp. nov. brings to fourteen the number of Stegonotus species described from New Guinea. A dichotomous key to described species in the New Guinea region is provided. 

Taxonomic revision of Aegla lata Bond-Buckup & Buckup, 1994 (Decapoda: Anomura: Aeglidae), with the description of a new species of Aegla Leach, 1820 from the Upper Paraná Ecoregion, Brazil

2020 ◽  
Vol 40 (4) ◽  
pp. 425-434
Author(s):  
Ingrid C Marçal ◽  
Fernanda P Páez ◽  
Lenice Souza-Shibatta ◽  
Silvia H Sofia ◽  
Gustavo M Teixeira
Keyword(s):  
New Species ◽  
River Basin ◽  
Taxonomic Revision ◽  
Morphological Characters ◽  
The Body ◽  
Type Locality ◽  
Morphological Data ◽  
Molecular Evidence ◽  
Coi Mtdna ◽  
A New Species

Abstract Aegla lata Bond-Buckup & Buckup, 1994 is considered extinct in the type locality. New populations of this species, however, have been found in northern Paraná state, Brazil. We revised the taxonomy of A. lata based on morphological data obtained from the type material and specimens recently obtained from streams of the Tibagi River sub-basin, Paranapanema River basin, Upper Paraná Ecoregion. Moreover, Aegla jacutingan. sp. is described and illustrated. The new species resembles A. lata in the shapes of the body and chelipeds. Both species are nevertheless separated by particular morphological characters of the carapace, chelipeds, and epimeron as well as by molecular (COI mtDNA) differences. Both species can be distinguished from their congeners based on morphological and molecular evidence.

A new species of Cetopsis from the Guiana Shield (Siluriformes: Cetopsidae: Cetopsinae)

Zootaxa ◽  
2019 ◽  
Vol 4664 (2) ◽  
pp. 221-232
Author(s):  
VITOR ABRAHÃO ◽  
JAN MOL ◽  
MARIO DE PINNA
Keyword(s):  
New Species ◽  
River Basin ◽  
Sister Group ◽  
The Body ◽  
Guiana Shield ◽  
New Taxon ◽  
Dorsal Fin ◽  
Maracaibo Basin ◽  
Dark Pigmentation ◽  
A New Species

A new species of Cetopsis is described from Guiana Shield drainages in Guyana and Suriname. The new species is found in the Konawaruk River and tributaries, Essequibo River basin, Guyana, and in the Mauritie Creek, tributary to the Tempati River, upper Commewijne River basin, Suriname. The new taxon can be distinguished from all congeners by a combination of features: dark spots on sides of the body eye-sized or larger, dark, bilobed patch at the base of the caudal fin, absence of a dark humeral spot, absence of dark pigmentation along the fin-membrane posterior to the first dorsal-fin ray, dark pigmentation at the base of the dorsal fin, dark spots extending ventrally to the bases of anal-fin rays, and 41 total vertebrae with 28 caudal vertebrae. Data on internal anatomy of the new species were incorporated into a previously-published phylogenetic analysis and resolves the position of the new species as the sister group of C. motatanensis, from Lago Maracaibo basin. The new Cetopsis is the first species of the genus known to occur exclusively in the Guiana Shield. 

scholarly journals A new species of Gymnelus (Perciformes, Zoarcidae) from Greenland, similar to G. viridis

2021 ◽  
Vol 325 (1) ◽  
pp. 34-48
Author(s):  
N.V. Chernova ◽  
P.R. Møller
Keyword(s):  
New Species ◽  
North Pacific Ocean ◽  
Original Description ◽  
The Body ◽  
The Arctic ◽  
West Greenland ◽  
Pectoral Fins ◽  
Dorsal Fin ◽  
South West ◽  
A New Species

Zoarcid fishes of the genus Gymnelus Reinhardt inhabit the shelves of the North Pacific Ocean and the Arctic. A new species, G. pseudosquamatus sp. nov., is described from trawl samples taken at depths off South-West Greenland. It is most similar to the type species of the genus, Common Fish Doctor G. viridis, inhabiting the coastal waters of Greenland. The characters of the latter are specified on materials from the type locality, including the neotype and specimens of J.C.H. Reinhardt. Both species are in the group of Gymnelus with an interrupted supratemporal commissura, two supratemporal sensory pores (1+0+1), and a dorsal fin originating above the pectoral fin. The two species differ in a complex of characters, including habitus. In G. viridis, the trunk is roundish in cross section, highest above the beginning of the anal fin; the anterior rays of the dorsal fin are shortened, and covered with a thick and somewhat fleshy skin. In G. pseudosquamatus, the body is compressed and deeper anteriorly, the dorsal-fin rays are evenly elongated, and the fin membrane is thin. Differences in counts and measurements are statistically significant, including the number of vertebrae and rays in the dorsal, anal and pectoral fins, the number of teeth on the jaws, as well as the length and depth of the head, predorsal length, the length of pectoral fins, eye diameter and length of the gill slit. The color of G. pseudosquamatus, with 8–16 wide brown mottled bands, is also unusual, as the skin is dotted with light speckles that create the illusion of tiny scales, which is the reason for the name “pseudosquamatus”, the Deceptive Fish Doctor. While G. viridis is found inshore in a zone of macroalgae, the new species is found in deeper waters (100–457 m) along the shelf edge of South-West Greenland. The name Ophidium stigma Lay et Bennett, 1839 (=Gymnelus stigma) should be excluded from the synonymy of G. viridis, since the original description mentions the presence of scales on the body, which are absent in Gymnelus.

scholarly journals A new endemic species of Bryconamericus (Characiformes, Characidae) from the Middle Cauca River Basin, Colombia

2014 ◽  
Vol 37 (2) ◽  
pp. 107-114 ◽  
Author(s):  
C. Román–Valencia ◽  
◽  
R. I. Ruiz-C. ◽  
D. C. Taphorn ◽  
C. García-Alzate ◽  
...  
Keyword(s):  
New Species ◽  
River Basin ◽  
Endemic Species ◽  
Anterior Maxilla ◽  
Pectoral Fins ◽  
Dorsal Fin ◽  
Scale Size ◽  
Small Scales ◽  
A New Species ◽  
Pelvic Fin

Bryconamericus caldasi, a new species, is described from the Middle Cauca River drainage, Andean versant of Colombia. The new species is distinguished from all congeners by: the number of predorsal scales (15–17 vs. 9–14); a wide anterior maxilla tooth, at least twice as wide as the posterior tooth, both of which are pentacuspid (vs. maxilla teeth of same size); a dark lateral stripe overlaid by a peduncular spot; and a reticulated pattern on the sides of body (vs. peduncular spot and other body pigments not superimposed over a dark lateral stripe). We found several differences that distinguish the new species from B. caucanus, the only sympatric congener: number of predorsal median scales (15–17 vs. 12–13); convex predorsal profile (vs. oblique); scale size and number of scale rows at caudal–fin base (small scales arranged in two or more rows vs. large scales in just one row); pectoral fins not or just reaching pelvic fin insertions (vs. pectoral fins reaching posterior to pelvic–fin insertions); and dorsal–fin origin position (at vertical through posterior tip of pelvic–fin vs. at a vertical anterior to pelvic–fin tip).

A new species of Heptapterus Bleeker 1858 (Siluriformes, Heptapteridae) from the Uruguay River Basin in Misiones, Northeastern Argentina

Zootaxa ◽  
2017 ◽  
Vol 4299 (4) ◽  
pp. 572 ◽  
Author(s):  
GASTÓN AGUILERA ◽  
MAURICIO BENITEZ ◽  
GUILLERMO ENRIQUE TERÁN ◽  
FELIPE ALONSO ◽  
JUAN MARCOS MIRANDE
Keyword(s):  
New Species ◽  
River Basin ◽  
Coloration Pattern ◽  
Fin Rays ◽  
Adipose Fin ◽  
Uruguay River ◽  
Northeastern Argentina ◽  
A New Species ◽  
Size Variable ◽  
Small Tributary

In this paper we describe Heptapterus mandimbusu sp. n., a new species of heptapterid catfish from a small tributary of the Uruguay River Basin in Misiones-Argentina. This new species is distinguished from all other congeners by the unique coloration pattern with aggregated melanophores scattered on dorsal and lateral surface of body, forming conspicuous size-variable blotches, and the combination of a long interdorsal distance (13.8–18.9 % SL), 14–18 anal-fin rays, short maxillary barbels (52.2–74.5 % HL), and the adipose fin confluent with caudal fin. 

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