Dirivultidae (Copepoda: Siphonostomatoida) from hydrothermal vent fields in the Okinawa Trough, North Pacific Ocean, with description of one new species

2020 ◽  
pp. 1-16
Author(s):  
Daisuke Uyeno ◽  
Keiichi Kakui ◽  
Hiromi K. Watanabe ◽  
Yoshihiro Fujiwara
Keyword(s):  
North Pacific ◽  
Hydrothermal Vent ◽  
Okinawa Trough ◽  
North Pacific Ocean ◽  
Filamentous Bacteria ◽  
Adult Males ◽  
Squat Lobster ◽  
The Okinawa Trough ◽  
First Time ◽  
One New Species

Abstract Two species of dirivultid copepod (Siphonostomatoida), Stygiopontius senckenbergi Ivanenko & Ferrari, 2013 and Dirivultus kaiko sp. nov., were discovered from hydrothermal vent fields in the Okinawa Trough, the western North Pacific. Since S. senckenbergi was originally described based on two adult males from the New Ireland Fore-Arc system, Papua New Guinea, the discovery here represents the second record. This species was attached on ventral setae covered with filamentous bacteria of the deep-sea squat lobster Shinkaia crosnieri (Decapoda: Munidopsidae). The female of S. senckenbergi is described for the first time as well as the nauplius I and the copepodid IV. Sexual dimorphism is shown on several appendages (i.e. antennule, leg 2 and leg 5). The nauplius I shows typical lethithotrophic characteristics. Dirivultus kaiko sp. nov., which was found on the tentacular crown of the siboglinid tubeworm Lamellibrachia columna, differs from its two congeners by the antennule, maxilliped and leg 5 of both sexes. These are the second and third dirivultid species to be reported from Japan.

Review of the leafhopper genus Hatigoria Distant with one new species (Hemiptera: Cicadellidae: Hylicinae)

Zootaxa ◽  
2021 ◽  
Vol 5005 (3) ◽  
pp. 358-366
Author(s):  
JIU TANG ◽  
YALIN ZHANG
Keyword(s):  
New Species ◽  
Morphological Study ◽  
First Record ◽  
External Morphology ◽  
Adult Males ◽  
First Time ◽  
One New Species

The taxonomy of the hylicine genus Hatigoria Distant is reviewed based on morphological study of the types and other specimens. The male external morphology and genitalia of two known species, H. praeiens Distant, 1908 and H. sauteri Jacobi, 1914, are described and photographed for the first time. A description and figures of the female ovipositor of H. praeiens Distant, 1908 are provided. One new species, H. longistylia n. sp., from Laos and China is reported with descriptions and figures. This also represents the first record of the genus Hatigoria from Laos. A key to adult males of all species is provided.

A new species of the genus Neoverruca (Cirripedia, Thoracica, Verrucidea, Neoverrucidae) from a hydrothermal vent area in the Okinawa Trough

Crustaceana ◽  
2015 ◽  
Vol 88 (9) ◽  
pp. 991-1001 ◽  
Author(s):  
Zhong-Li Sha ◽  
Xian-Qiu Ren
Keyword(s):  
New Species ◽  
Hydrothermal Vent ◽  
Distal Part ◽  
Okinawa Trough ◽  
Longitudinal Ridge ◽  
Longitudinal Groove ◽  
The Okinawa Trough ◽  
Inner Surface ◽  
A New Species

A new species of the neoverrucid barnacle genusNeoverrucaNewman, 1989,N. intermediasp. nov., collected from a hydrothermal vent area in the Okinawa Trough, is described and illustrated. It differs fromN. brachylepadoformisNewman, 1989 by the apical end of the inner surface of the movable scutum being in a pocket-form, with a longitudinal groove upwards, and without median ridges; the adductor ridge (or myophore) of the fixed scutum stout and the inner distal part of the scutum without longitudinal ridge.

New ways for research and development using a deep-sea hydrothermal vent system in the Okinawa Trough

2015 ◽  
Author(s):  
Tomokazu Saruhashi ◽  
Masanori Kyo ◽  
Ikuo Sawada ◽  
Takahiro Yokoyama ◽  
Noriaki Sakurai ◽  
...  
Keyword(s):  
Research And Development ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Okinawa Trough ◽  
The Okinawa Trough

scholarly journals Draft Genome Sequence of Exiguobacterium sp. HVEsp1, a Thermophilic Bacterium Isolated from a Deep-Sea Hydrothermal Vent in the Okinawa Trough

2017 ◽  
Vol 5 (17) ◽  
Author(s):  
Chen Chen ◽  
Li Sun
Keyword(s):  
Genome Sequence ◽  
Deep Sea ◽  
Hydrothermal Vent ◽  
Hydrothermal Vents ◽  
Sequence Data ◽  
Okinawa Trough ◽  
Draft Genome ◽  
Thermophilic Bacterium ◽  
Draft Genome Sequence ◽  
The Okinawa Trough

ABSTRACT We report here the draft genome sequence of Exiguobacterium sp. HVEsp1, a thermophilic bacterium isolated from a deep-sea hydrothermal vent. The estimated genome size of this strain is 2,838,499 bp with a G+C content of 48.2%. The genome sequence data provide valuable information that will facilitate studies on the adaptation mechanisms of bacteria living in deep-sea hydrothermal vents.

Characteristics of the Environment Around a Massive Sea-Floor Sulfide Area in the Okinawa Trough

2011 ◽  
Author(s):  
Hiroshi Ishida ◽  
Nobuhiro Maeda ◽  
Tetsuya Miwa ◽  
Tetsuo Yamazaki ◽  
Yoshihisa Shirayama ◽  
...  
Keyword(s):  
Hydrothermal Vent ◽  
Okinawa Trough ◽  
Euphotic Zone ◽  
Bottom Layer ◽  
Massive Sulfide ◽  
Baseline Survey ◽  
Surrounding Area ◽  
Sea Floor ◽  
The Okinawa Trough ◽  
Ca 50

It is necessary to carry out a proper environmental impact assessment for not only the sea-floor massive sulfide area where a special hydrothermal-vent chemosynthetic ecosystem is observed, but also its surrounding area. This paper shows provisional results of the environmental baseline survey conducted at the Izena Cauldron in 2009. Environmental conditions differed clearly between inside and outside of the Cauldron. In the inside area, a high turbidity layer was recognized at ca. 200 m above the sea-floor. In the bottom layer close to the hydrothermal active region, water temperature was slightly higher than the surrounding area with the lower pH, higher concentrations of both carbon dioxide and the dissolved Mn. Inside the Cauldron, the sulfur isotope ratio of the sediment close to a sea-floor massive sulfide was similar to that of the hydrothermal sulfate. In addition, heavy metal concentrations of the sediment were higher inside than outside of the Cauldron. Especially, concentrations of Cd, As and Hg were as high as poisonous levels. These results show the possibility that most of the chemical materials derived from hydrothermal vent remain in the Cauldron. Pelagic shrimps of the family Oplophoridae were widely distributed in the bottom layer inside the Cauldron. The biomass of benthic shrimps which belong to infraorder Caridea was higher inside than outside of the Cauldron. These higher biomass was likely caused by the abundant organic matter. This hypothesis was reinforced by the result of the mooring sediment trap (placed at ca. 50 m above the seafloor) experiment, which demonstrated that the settling particle in the Cauldron was supplied from not only the euphotic zone but also the hydrothermal-vent ecosystem.

scholarly journals North Pacific-wide spreading of isotopically heavy nitrogen during the last deglaciation: Evidence from the western Pacific

2008 ◽  
Vol 5 (6) ◽  
pp. 1641-1650 ◽  
Author(s):  
S. J. Kao ◽  
K. K. Liu ◽  
S. C. Hsu ◽  
Y. P. Chang ◽  
M. H. Dai
Keyword(s):  
North Pacific ◽  
Accumulation Rate ◽  
Okinawa Trough ◽  
Last Deglaciation ◽  
The Okinawa Trough ◽  
A Site ◽  
Two Peaks ◽  
Heavy Nitrogen ◽  
The Last Glacial Maximum ◽  
The Last Glacial

Abstract. Sedimentary δ15 N records in two IMAGES cores (MD012404 and MD012403) retrieved from the Okinawa Trough (OT) in the western North Pacific reveal deglacial increases with two peaks occurring during the Bølling/Allerød and the Preboreal/early Holocene periods. These peaks are synchronous with previously reported δ15 N peaks in the Eastern Tropical North Pacific, although the amplitudes (from 3.8 to 5.8‰) are much smaller in the OT. Similar δ15 N values for the last glacial maximum and the late-Holocene observed by us at a site far from the present-day zones of water-column denitrification (WCD) indicate that the mean 15 N/14 N of nitrate in the upper ocean did not differ much between the two climate states. The accumulation rate of organic carbon and total sulfur content are used as indices of the local WCD potential. The results suggest that enhancement of global WCD rather than local denitrification should be responsible for the deglacial maxima of sedimentary δ15 N in the Okinawa Trough. Our data could provide additional constraints to better understand changes in nitrogen budget during the glacial to interglacial transition.

Sperm masses and sperm transfer in a vestimentiferan, Ridgeia piscesae Jones, 1985 (Pogonophora: Obturata)

1989 ◽  
Vol 67 (11) ◽  
pp. 2776-2781 ◽  
Author(s):  
Eve C. Southward ◽  
Kathryn A. Coates
Keyword(s):  
North Pacific ◽  
Hydrothermal Vent ◽  
North Pacific Ocean ◽  
Maximum Dimension ◽  
Ridgeia Piscesae ◽  
Tube Worms ◽  
Juan De Fuca ◽  
Males And Females ◽  
The Masses ◽  
Vent Tube

Discrete sperm masses, of irregular outline, 2–5 mm in their maximum dimension, were found on males and females of Ridgeia piscesae Jones, 1985 (Pogonophora: Obturata), hydrothermal vent tube worms from the Juan de Fuca and Explorer Ridges in the eastern North Pacific Ocean. Masses were found in tentacular and vestimental locations, often near the gonopores. The fine structure and size of spermatozoa from inside males are the same as in the masses and are distinctly different from described spermatozoa of perviate pogonophores. Maturation of the spermatozoa appears to be completed within the external sperm mass, after spawning. The sperm masses produced by males may be actively transferred to adjacent females of the densely aggregated animals found at the vent sites. In the females, these masses come to rest near the gonopores where fertilization may occur, just internal or external to the pores.

First finding of a widely distributed Antarctic chiton species (Mollusca: Polyplacophora) in the North Pacific

2019 ◽  
Vol 29 (1) ◽  
pp. 71-74
Author(s):  
B. I. Sirenko
Keyword(s):  
North Pacific ◽  
North Pacific Ocean ◽  
Water Current ◽  
Antarctic Species ◽  
The North ◽  
Emperor Seamounts ◽  
The Antarctic ◽  
First Time ◽  
The North Pacific ◽  
South Ocean

For the first time, the widely spread Antarctic species Leptochiton antarcticus was found at the Emperor Seamounts in the North Pacific Ocean. In spite of a large distance between the Emperor Seamounts and Antarctica, the found specimen have very similar shell, girdle, radula and gill features to the type material. I propose that L. antarcticus spread to the North Pacific from the Antarctic via a deep-water current near the ocean floor, and perhaps it inhabits the slopes of islands and continents from the South Ocean to the Emperor Seamounts.

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