Unique Shape of the First Elongate Haemal Spine of Albacore, Thunnus alalunga (Bonnaterre)

Copeia ◽  
1963 ◽  
Vol 1963 (2) ◽  
pp. 460
Author(s):  
Walter M. Matsumoto
Keyword(s):  
Haemal Spine ◽  
Unique Shape ◽  
Thunnus Alalunga

scholarly journals Intraspecific variation in the Cambrian: new observations on the morphology of the Chengjiang euarthropod Sinoburius lunaris

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Michel Schmidt ◽  
Yu Liu ◽  
Xianguang Hou ◽  
Joachim T. Haug ◽  
Carolin Haug ◽  
...  
Keyword(s):  
Intraspecific Variation ◽  
Southwest China ◽  
3D Models ◽  
Morphological Characters ◽  
Open Questions ◽  
New Findings ◽  
Unique Shape ◽  
Variable Species ◽  
Chengjiang Biota ◽  
3D Software

Abstract Background The Chengjiang biota from southwest China (518-million-years old, early Cambrian) has yielded nearly 300 species, of which more than 80 species represent early chelicerates, crustaceans and relatives. The application of µCT-techniques combined with 3D software (e.g., Drishti), has been shown to be a powerful tool in revealing and analyzing 3D features of the Chengjiang euarthropods. In order to address several open questions that remained from previous studies on the morphology of the xandarellid euarthropod Sinoburius lunaris, we reinvestigated the µCT data with Amira to obtain a different approach of visualization and to generate new volume-rendered models. Furthermore, we used Blender to design 3D models showing aspects of intraspecific variation. Results New findings are: (1) antennulae consist of additional proximal articles that have not been detected before; (2) compared to other appendages, the second post-antennular appendage has a unique shape, and its endopod is comprised of only five articles (instead of seven); (3) the pygidium bears four pairs of appendages which are observed in all specimens. On the other hand, differences between specimens also have been detected. These include the presence/absence of diplotergites resulting in different numbers of post-antennular appendages and tergites and different distances between the tip of the hypostome and the anterior margin of the head shield. Conclusions Those new observations reveal intraspecific variation among Chengjiang euarthropods not observed before and encourage considerations about possible sexual dimorphic pairs or ontogenetic stages. Sinoburius lunaris is a variable species with respect to its morphological characters, cautioning that taxon-specific variabilities need to be considered when exploring new species.

Unique shape dependence in the coherent influence of signature on energies andM1rates

1989 ◽  
Vol 40 (6) ◽  
pp. 2862-2869 ◽  
Author(s):  
G. B. Hagemann ◽  
I. Hamamoto
Keyword(s):  
Shape Dependence ◽  
Unique Shape

How important are coastal fronts to albacore tuna (Thunnus alalunga) habitat in the Northeast Pacific Ocean?

2017 ◽  
Vol 150 ◽  
pp. 62-71 ◽  
Author(s):  
Karen Nieto ◽  
Yi Xu ◽  
Steven L.H. Teo ◽  
Sam McClatchie ◽  
John Holmes
Keyword(s):  
Pacific Ocean ◽  
Northeast Pacific ◽  
Albacore Tuna ◽  
Thunnus Alalunga ◽  
Northeast Pacific Ocean

Pseudascarophis kyphosi n.gen., n.sp. (Nematoda: Cystidicolidae) from the stomach of the fish Kyphosus cinerascens (Forskål) from Japan

1985 ◽  
Vol 63 (11) ◽  
pp. 2684-2688 ◽  
Author(s):  
R. C. Ko ◽  
L. Margolis ◽  
M. Machida
Keyword(s):  
New Genus ◽  
Buccal Cavity ◽  
Medial Region ◽  
Southeast Coast ◽  
Oral Opening ◽  
Unique Shape

Pseudascarophis kyphosi n.gen., n.sp. (Nematoda: Cystidicolidae) is described for specimens collected from the stomach of Kyphosus cinerascens (Forskål) from the southeast coast of Japan. The new genus is distinguished from all other genera of Cystidicolidae by its oral structure (presence of four submedian, longitudinally directed, digitiform processes in the buccal cavity projecting slightly beyond the oral opening; smooth margined mouth; absence of submedian labia and sublabia; and unique shape of the medial region of the pseudolabia) and numbers of caudal papillae in the male (3 pairs preanal, 7 pairs postanal).

scholarly journals Two-dimensional IR spectroscopy of the anti-HIV agent KP1212 reveals protonated and neutral tautomers that influence pH-dependent mutagenicity

2015 ◽  
Vol 112 (11) ◽  
pp. 3229-3234 ◽  
Author(s):  
Chunte Sam Peng ◽  
Bogdan I. Fedeles ◽  
Vipender Singh ◽  
Deyu Li ◽  
Tiffany Amariuta ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Mutation Rates ◽  
Viral Population ◽  
Lethal Mutagenesis ◽  
2D Ir ◽  
Viral Mutation ◽  
Unique Shape ◽  
Ph Dependent ◽  
Mutagenic Property ◽  
Anti Hiv

Antiviral drugs designed to accelerate viral mutation rates can drive a viral population to extinction in a process called lethal mutagenesis. One such molecule is 5,6-dihydro-5-aza-2′-deoxycytidine (KP1212), a selective mutagen that induces A-to-G and G-to-A mutations in the genome of replicating HIV. The mutagenic property of KP1212 was hypothesized to originate from its amino–imino tautomerism, which would explain its ability to base pair with either G or A. To test the multiple tautomer hypothesis, we used 2D IR spectroscopy, which offers subpicosecond time resolution and structural sensitivity to distinguish among rapidly interconverting tautomers. We identified several KP1212 tautomers and found that >60% of neutral KP1212 is present in the enol–imino form. The abundant proportion of this traditionally rare tautomer offers a compelling structure-based mechanism for pairing with adenine. Additionally, the pKa of KP1212 was measured to be 7.0, meaning a substantial population of KP1212 is protonated at physiological pH. Furthermore, the mutagenicity of KP1212 was found to increase dramatically at pH <7, suggesting a significant biological role for the protonated KP1212 molecules. Overall, our data reveal that the bimodal mutagenic properties of KP1212 result from its unique shape shifting ability that utilizes both tautomerization and protonation.

Age and growth of albacore Thunnus alalunga in the North Pacific Ocean

2012 ◽  
Vol 80 (6) ◽  
pp. 2328-2344 ◽  
Author(s):  
K.-S. Chen ◽  
T. Shimose ◽  
T. Tanabe ◽  
C.-Y. Chen ◽  
C.-C. Hsu
Keyword(s):  
Pacific Ocean ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Age And Growth ◽  
The North ◽  
Thunnus Alalunga ◽  
The North Pacific

Taxonomy of the South American genus Pachypops Gill 1861 (Teleostei: Perciformes: Sciaenidae), with the description of a new species

Zootaxa ◽  
2002 ◽  
Vol 26 (1) ◽  
pp. 1 ◽  
Author(s):  
LILIAN CASATTI
Keyword(s):  
New Species ◽  
River Basins ◽  
Junior Synonym ◽  
Valid Species ◽  
Nominal Species ◽  
South American ◽  
The South ◽  
Haemal Spine ◽  
A New Species ◽  
Fin Spines

Pachypops is a South American freshwater sciaenid genus characterized by having two anal-fin spines, three mental barbels, an inferior mouth, a swimbladder with a pair of short appendages anteriorly and a pair of longer appendages projected posteriorly, and the haemal spine of the first caudal distinctly expanded. Three valid Pachypops species are recognized herein. Of the six nominal species previously assigned to Pachypops, two are herein recognized as valid (Perca fourcroi and Micropogon trifilis), two are assigned to other sciaenid genera (Pachypops adspersus and Pachypops cevegei) and two are considered junior synonyms (Corvina biloba and Pachypops camposi). A seventh nominal species, Pachyurus nattereri, formerly considered a valid species of Pachyurus, is determined to be a junior synonym of Pachypops fourcroi, and lectotype and paralectotypes are designated for it. Pachypops fourcroi occurs in the Orinoco, Amazonas, Essequibo, Corantijn, and Approuague River basins, and Pachypops trifilis in rivers of Guyana and middle and lower reaches of the Rio Amazonas basin. A third valid species, Pachypops pigmaeus n. sp., is herein described from tributaries of the Rio Amazonas, Brazil.

Sign in / Sign up

Export Citation Format

Share Document