scholarly journals Scale morphology and specialized dorsal scales of a new teleosteomorph fish from the Aptian of West Gondwana

Fossil Record ◽  
2016 ◽  
Vol 19 (1) ◽  
pp. 61-81 ◽  
Author(s):  
P. G. Giordano ◽  
G. Arratia ◽  
H.-P. Schultze
Keyword(s):  
Posterior Margin ◽  
Smooth Surface ◽  
Unique Feature ◽  
The Body ◽  
Dorsal Margin ◽  
Ventral Margin ◽  
Dorsal Lobe ◽  
Caudal Fin ◽  
West Gondwana ◽  
A New Species

Abstract. Scales of a new species of Teleosteomorpha from the continental Aptian of the south of South America are studied. These neopterygians are from the La Cantera Formation in central Argentina, and were previously identified as Pholidophoriformes. They present ganoid scales; most of them are rhombic with well-developed peg-and-socket articulations and possessing a smooth surface. They have a straight posterior margin, but occasionally, some scales of the flank have a sinuous posterior margin with one or two serrations. The shape of the scales varies along the body from large, rectangular and deeper than long scales behind the head to the preanal region to smaller and rhomboidal scales in the caudal region. There are a few horizontal rows along the flank and about 32 lateral line scales. Thick, round ganoid scales are present in the prepelvic region close to the ventral margin. The round and rhombic scales present growth lines, which form concentric ridges on the external side. A characteristic row of deep scales forms the dorsal margin on each side of the body; a row of median ridge scales is not present. This is a unique feature of the studied fishes. Scutes covered with unornamented ganoine precede the pelvic, dorsal, and anal fins, as well as the dorsal and ventral margins of the caudal fin. The posterior margin of the dorsal lobe of the caudal fin is formed by a single line of scales, which continues and covers the base of the first principal caudal ray. Histological studies reveal a lepisosteoid-scale type with multiple ganoine layers, lack of dentine, and the presence of canaliculi of Williamson. The macro- and micromorphology of the scales shows features that are found in other teleosteomorphs, but also in other neopterygians.

scholarly journals Hemigrammus ataktos: a new species from the rio Tocantins basin, central Brazil (Characiformes: Characidae)

2014 ◽  
Vol 12 (2) ◽  
pp. 257-264 ◽  
Author(s):  
Manoela M. F. Marinho ◽  
Fernando C. P. Dagosta ◽  
José L. O. Birindelli
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Posterior Margin ◽  
The Body ◽  
Caudal Fin ◽  
Central Brazil ◽  
Fin Rays ◽  
Complete Series ◽  
A New Species

A new species of Hemigrammus is described from the middle rio Tocantins basin, central Brazil. The new species can be distinguished from all congeners by having a black midlateral stripe on the body extending from the posterior margin of the eye to the median caudal-fin rays. Mature males possess dorsal-, pelvic-, and anal-fin rays elongate, features that also help to recognize the new species. Although the new species is described in Hemigrammus, some specimens present a complete series of pored scales in the lateral line. A discussion about the generic allocation of the new species is presented.

Hemiodus jatuarana, a new species of Hemiodontidae from the rio Trombetas, Amazon Basin, Brazil (Teleostei, Characiformes)

Zootaxa ◽  
2004 ◽  
Vol 546 (1) ◽  
pp. 1 ◽  
Author(s):  
FRANCISCO LANGEANI
Keyword(s):  
New Species ◽  
Amazon Basin ◽  
Branchial Arch ◽  
The Body ◽  
Dark Spot ◽  
Gill Rakers ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Dark Pigmentation ◽  
A New Species

Hemiodus jatuarana, a new species of the Hemiodontidae from Oriximin , rio Trombetas, Amazon Basin, Brazil, is described. The new species can be readily distinguished from its congeners by the presence of a horizontally elongated dark spot on the caudal peduncle, and by the absence of any other dark pigmentation pattern on the body. Hemiodus jatuarana is readily separated from H. immaculatus, another species without dark pigmentation on the body, by having 25 27 epibranchial and 36 37 ceratobranchial gill rakers on the first branchial arch, and caudal-fin lobes without longitudinal stripes, vs. 14 16 and 21 25 gill rakers, and a conspicuous longitudinal stripe on each caudal-fin lobe in H. immaculatus. The new species is only known from its type-locality, where it cooccurs with H. immaculatus.

A new species of the genus Achalinus from southwestern Guangdong Province, China (Squamata: Xenodermatidae)

Zootaxa ◽  
2019 ◽  
Vol 4674 (4) ◽  
pp. 471-481 ◽  
Author(s):  
JIAN WANG ◽  
YAO LI ◽  
ZHAO-CHI ZENG ◽  
ZHI-TONG LYU ◽  
YIK-HEI SUNG ◽  
...  
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Mainland China ◽  
Guangdong Province ◽  
The Body ◽  
Gene Fragment ◽  
Single Row ◽  
Tail Tip ◽  
Significant Genetic Divergence ◽  
A New Species

A new species of xenodermatid snake, Achalinus yunkaiensis J. Wang, Y. Li & Y.Y. Wang, sp. nov. was described based on a series of specimens collected from Dawuling Forestry Station located in the Yunkai Mountains of western Guangdong Province. It can be distinguished from known congeners by a significant genetic divergence at the mitochondrial CO1 gene fragment examined (p-distance ≥ 12.0%) and the following combination of characters: (1) dorsal scales strongly keeled, in 23 rows throughout the body, the most outer row on each side smooth and significantly enlarged; (2) tail relatively shorter, TaL/TL ratio 18.5–20.0%; (3) maxillary teeth 20–22; (4) length of suture between internasals subequal to that between the prefrontals; (5) nasal divided into two sections by nasal cleft, posterior one half as long as anterior; (6) loreal elongated, nearly twice as wide as high; (7) supralabials six; (8) infralabials six; (9) temporals 2+2+3 (rarely 2+2+4), the two anterior temporals in contact with eye; (10) ventrals 151–162, subcaudals 49–56 arranged in single row, not paired; (11) cloacal entire; (12) uniform brown (in adults) or black (in juveniles) above, tinged weakly iridescent, with a longitudinal dark-colored vertebral line; (13) light brown (in adults) or greyish white (in juveniles) beneath; and (14) dorsum with a longitudinal dark brown vertebral stripe from posterior margin of parietals to tail tip. Currently, 13 species are known in the genus Achalinus, with seven from mainland China. 

scholarly journals A new species of Microglanis(Siluriformes: Pseudopimelodidae) from the upper rio Tocantins basin, Goiás State, Central Brazil

2014 ◽  
Vol 12 (1) ◽  
pp. 81-87 ◽  
Author(s):  
Oscar Akio Shibatta
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Posterior Margin ◽  
Color Pattern ◽  
Occipital Region ◽  
Caudal Fin ◽  
Central Brazil ◽  
Unique Color ◽  
A New Species ◽  
Pelvic Fin

A new species of Microglanis is described from the upper rio Tocantins basin, Barro Alto, Goiás State, Brazil. This species is distinguished from the others by presenting a unique color pattern, consisting of round spots in the flank between the larger dark brown blotches. Moreover, it can be distinguished by the combination of the following features: caudal fin emarginate, the upper lobe slightly larger than the lower, lateral line relatively long, reaching vertical through posterior margin of the pelvic fin, and light stripe on supra-occipital region absent or very narrow and with irregular shape.

A new species of Pimelodella Eigenmann & Eigenmann, 1888 (Siluriformes: Heptapteridae) from the Orinoco River basin

Zootaxa ◽  
2020 ◽  
Vol 4808 (3) ◽  
pp. 491-506
Author(s):  
MIGUEL ÁNGEL CORTÉS-HERNÁNDEZ ◽  
CARLOS DONASCIMIENTO ◽  
HERNANDO RAMÍREZ-GIL
Keyword(s):  
New Species ◽  
River Basin ◽  
Taxonomic Status ◽  
Dorsal Lobe ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Orinoco River ◽  
Dorsal Fin ◽  
Adipose Fin ◽  
A New Species

A new species of Pimelodella is described from western Andean tributaries of the Orinoco River basin. The new species differs from all congeners by a unique set of characters that includes long maxillary barbel, surpassing the dorsal lobe of the caudal fin; relatively short adipose fin (32.8–36.4 of SL); 40–42 total vertebrae; posterior margin of pectoral-fin spine with 12–18 retrorse dentations along basal two thirds; laterosensory canal foramina of dentary and preopercle large and externally conspicuous; a brown faint and narrow midlateral stripe extending from the pseudotympanum, fading posteriorly along the caudal peduncle, and ending as a spot at the caudal-fin base; and dorsal-fin base darkly pigmented, from spinelet to posteriormost interradial membrane. Taxonomic status of P. pallida and presence of P. cruxenti in Colombia are also discussed. 

scholarly journals On a new species of the genus Moenkhausia Eigenmann (Ostariophysi: Characidae)

Zootaxa ◽  
2007 ◽  
Vol 1525 (1) ◽  
pp. 61-68 ◽  
Author(s):  
PAULO H.F. LUCINDA ◽  
LUIZ R. MALABARBA ◽  
RICARDO C. BENINE
Keyword(s):  
New Species ◽  
Distribution Pattern ◽  
Lateral Line ◽  
The Body ◽  
Dark Spot ◽  
Lateral Line Scale ◽  
Caudal Fin ◽  
Body Side ◽  
Line Scale ◽  
A New Species

A new species of the genus Moenkhausia is described from the middle portions of the Rio Tocantins and tentatively from the Rio Apure in Venezuela, Rio Orinoco drainage. It is diagnosed by the presence of a dark spot in the half proximal length of the upper caudal-fin lobe, and by the presence of a large, irregularly shaped humeral spot located above the sixth to ninth perforated lateral line scale which is more posteriorly positioned along the body side in relation to other members of the genus. The distribution pattern of the new species is discussed.

Description of a new species of sand-dwelling catfish of the genus Stenolicmus (Siluriformes; Trichomycteridae)

Zootaxa ◽  
2011 ◽  
Vol 2752 (1) ◽  
pp. 62 ◽  
Author(s):  
WOLMAR BENJAMIN WOSIACKI ◽  
DANIEL PIRES COUTINHO ◽  
LUCIANO FOGAÇA DE ASSIS MONTAG
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Color Pattern ◽  
Distal Margin ◽  
Dorsal Region ◽  
Caudal Peduncle ◽  
Caudal Fin ◽  
Left Tributary ◽  
Fin Length ◽  
A New Species

Stenolicmus ix, new species, is described from Igarapé Curuá, left tributary of the Rio Amazonas, Pará, Brazil. It can be distinguished from S. sarmientoi by the length of the nasal barbels that reach the base of the first opercular odontodes; length of the maxillary barbels that reach the posterior margin of the opercular odontode plate; seven well-developed opercular odontodes; seven well-developed interopercular odontodes; color pattern of the dorsal region of trunk composed of agglomerated chromatophores forming circular patches twice the diameter of the eye; proportionally large eyes, 11.8% HL; caudal peduncle tall, 11.6% SL, without dark bar at base of the caudal fin; length of the head proportionately larger, 17.9% SL; unbranched rays of caudal fin reaching distal margin of fin. Comparisons with other Sarcoglanidinae and Trichomycteridae are presented. Some comments on the systematics and phylogenetic relationships of the group are made.

A new Species of Encyrtidae parasitic in Coccus hesperidum, L

1947 ◽  
Vol 38 (2) ◽  
pp. 281-283
Author(s):  
Harold Compere
Keyword(s):  
New Species ◽  
Cutting Edge ◽  
Biological Information ◽  
Dorsal Margin ◽  
Ventral Margin ◽  
Typical Species ◽  
Coccus Hesperidum ◽  
The One ◽  
Similar Kind ◽  
A New Species

The species described as new is placed in the genus Adelencyrtus, Ashmead, provisionally. The description is published at this time to provide a name, so that biological information concerning the species can be made a matter of record. The new species is most closely allied to Adelencyrtus. It differs from typical species of this genus with regard to the mandibles. In typical Adelencyrtus the mandibles are quadridentate, and the ventral margin is provided with a stout, cone-shaped seta. In the new species only the ventral tooth is distinct; the dorsal margin of the cutting edge appears as a wide truncation, which can scarcely be described as subdivided, and the ventral margin of the mandible lacks the stout conical seta. The most useful character for the identification of this species, and the one which reveals its relationship to Adelencyrtus most surely, is the distinctive male antennae. In this sex the antennal club is enormously cylindrically elongated, and the funicle is composed of two vestigial segments that are contained in a recess at the base of the club. Antennae of a similar kind have been described in the males of Habrolepis, Förster and Anabrolepis, Timberlake, two genera which are closely allied to Adelencyrtus. The males of Adelencyrtus have not been described.

Hyphessobrycon petricolus, a new species of tetra (Characiformes: Characidae) from the rio Madeira basin, Mato Grosso, Brazil

Zootaxa ◽  
2017 ◽  
Vol 4221 (2) ◽  
pp. 242 ◽  
Author(s):  
WILLIAN M. OHARA ◽  
FLÁVIO C. T. LIMA ◽  
BRUNO S. BARROS
Keyword(s):  
New Species ◽  
Posterior Margin ◽  
Unique Combination ◽  
Caudal Fin ◽  
Mato Grosso ◽  
Fin Rays ◽  
A New Species ◽  
Rio Madeira

A new species of Hyphessobrycon is described from the rio Roosevelt, rio Madeira basin, Mato Grosso State, Brazil. Hyphessobrycon petricolus sp. n. can be distinguished from its congeners by the unique combination of the following features: a well-defined, relatively narrow dark midlateral stripe on body extending from immediately behind posterior margin of opercle to the middle caudal-fin rays, relatively conspicuous humeral blotch, and 16–20 branched anal-fin rays. Comments on the remaining Hyphessobrycon species presenting a conspicuous dark midlateral stripe are presented. 

A new marine epiphytic diatom species, Halamphora yundangensis sp. nov. (Bacillariophyceae), from Yundang Lake, Southeast coast of China

Phytotaxa ◽  
2020 ◽  
Vol 450 (2) ◽  
pp. 209-218
Author(s):  
WEIWEI WU ◽  
HUINA LIN ◽  
VISHAL PATIL ◽  
JOHN PATRICK KOCIOLEK ◽  
LIN SUN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
New Species ◽  
Similar Species ◽  
Dorsal Margin ◽  
Ventral Margin ◽  
Diatom Species ◽  
Green Seaweed ◽  
A New Species ◽  
Scanning Electron

Halamphora yundangensis sp. nov. is described as a new species epiphytic on the green seaweed Ulva lactuca, from Yundang Lake, Fujian Province, China. Morphological details of the new species with respect to shape, size and valve ultrastructure are presented, with observations based on light microscopy (LM) and scanning electron microscopy (SEM). The main features of Halamphora yundangensis are dorsiventral, semi-lanceolate valves with convex dorsal margin and straight ventral margin, as well as valve ends distinctly protracted and capitate. Externally, a prominent marginal ridge forming the image of a broad hyaline area is present. Internally, dorsal striae are regularly biseriate, and a row of areolae lies along raphe. The new species is compared with similar species in both Amphora and Halamphora.

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