scholarly journals Sexually Dimorphic Scale Worms (Annelida: Polynoidae) From Hydrothermal Vents in the Okinawa Trough: Two New Species and Two New Sex Morphs

2018 ◽  
Vol 5 ◽  
Author(s):  
Yanjie Zhang ◽  
Chong Chen ◽  
Jian-Wen Qiu
Keyword(s):  
New Species ◽  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
Sexually Dimorphic ◽  
The Okinawa Trough ◽  
Two New Species

Records of species of the hippolytid genus Lebbeus White, 1847 (Crustacea: Decapoda: Caridea) from hydrothermal vents in the Pacific Ocean, with descriptions of three new species

Zootaxa ◽  
2012 ◽  
Vol 3241 (1) ◽  
pp. 35 ◽  
Author(s):  
TOMOYUKI KOMAI ◽  
SHINJI TSUCHIDA ◽  
MICHEL SEGONZAC
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
East Pacific Rise ◽  
East Pacific ◽  
The Okinawa Trough ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Three New Species

Five species of the hippolytid shrimp genus Lebbeus White, 1847 are reported from various deep-water hydrothermal ventsites in the Pacific Ocean: L. laurentae Wicksten, 2010 from the East Pacific Rise 13°N; L. wera Ahyong, 2009 from theBrothers Seamount, Kermadec Ridge, New Zealand; L. pacmanus sp. nov. from the Manus Basin, Bismarck Sea; L.shinkaiae sp. nov. from the Okinawa Trough, Japan; and L. thermophilus sp. nov. from the Manus and Lau basins, south-western Pacific. Lebbeus laurentae is fully redescribed because the original and subsequent descriptions are not totallydetailed. Differentiating characters among the three new species and close allies are discussed. Previous records of Lebbeus species from hydrothermal vents are reviewed.

A new species of Parandania (Amphipoda, Stegocephalidae, Parandaniinae) from the Okinawa Trough

Crustaceana ◽  
2019 ◽  
Vol 92 (11-12) ◽  
pp. 1427-1434
Author(s):  
Yanrong Wang ◽  
Chaodong Zhu ◽  
Zhongli Sha ◽  
Xianqiu Ren
Keyword(s):  
New Species ◽  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
The Okinawa Trough ◽  
Fourth Species ◽  
A New Species

Abstract A new species of Stegocephalidae, Parandania unicoxae sp. nov., is reported from hydrothermal vents in the Okinawa Trough. It is the fourth species described in the genus Parandania Stebbing, 1899. The new species is most similar to P. boecki (Stebbing, 1888), but it can be readily distinguished from P. boecki by the unilobate coxae 6-7.

Two new species of the crangonid genus Metacrangon Zarenkov, 1965 (Crustacea: Decapoda: Caridea) from the Okinawa Trough, Japan

Zootaxa ◽  
2018 ◽  
Vol 4410 (1) ◽  
pp. 97
Author(s):  
TOMOYUKI KOMAI ◽  
CHONG CHEN ◽  
HIROMI KAYAMA WATANABE
Keyword(s):  
New Species ◽  
Genetic Analysis ◽  
Okinawa Trough ◽  
Species Group ◽  
Coi Gene ◽  
Ryukyu Islands ◽  
Mitochondrial Coi ◽  
The Okinawa Trough ◽  
Mitochondrial Coi Gene ◽  
Two New Species

Two new species of the crangonid shrimp genus Metacrangon Zarenkov, 1965, are described and illustrated on the basis of materials collected from the Okinawa Trough, Ryukyu Islands, southern Japan, during diving operations of remotely operated vehicles (ROVs): M. ryukyu n. sp. from off Iheya Island, at depth of 986 m; and Metacrangon kaiko n. sp. from NE of Yonaguni Island, at depth of 2205 m. The two new species resemble members of the M. munita (Dana, 1852) species group, but are both characteristic in having setose dactyli on pereopods 4 and 5. Some minor differences in morphology and genetic analysis using partial sequences of the barcoding mitochondrial COI gene support the recognition of the two new species. Holotypes of the two new species were collected from hydrothermally influenced areas, representing a previously unknown habitat for species of Metacrangon. 

scholarly journals Description of Seba longimera sp. nov. from hydrothermal vents in the Okinawa Trough, Northwest Pacific (Amphipoda, Amphilochoidea, Sebidae)

ZooKeys ◽  
2019 ◽  
Vol 899 ◽  
pp. 141-149
Author(s):  
Yanrong Wang ◽  
Chaodong Zhu ◽  
Zhongli Sha ◽  
Xianqiu Ren
Keyword(s):  
New Species ◽  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
Northwest Pacific ◽  
Distal Margin ◽  
Posterior Lobe ◽  
The Okinawa Trough ◽  
The Family

Seba longimerasp. nov., of the family Sebidae Walker, 1908, is described from hydrothermal vents in Okinawa Trough. Other two congenic species, S. bathybia Larsen, 2007 and S. profundus Shaw, 1989, are also reported from these hydrothermal vents, but the new species can be readily distinguished from them in having the merus of pereopods 5 and 6 extending beyond distal margin of carpus, coxa 4 smaller than coxae 2 and 3, and coxa 5 with the posterior lobe larger than the anterior one, rather than equilobate.

Two new species of the genus Anisoderomorpha Arrow, 1925 (Coleoptera: Erotylidae: Languriinae)

Zootaxa ◽  
2020 ◽  
Vol 4779 (4) ◽  
pp. 563-572
Author(s):  
WATARU TOKI
Keyword(s):  
New Species ◽  
Host Plant ◽  
External Morphology ◽  
Sexually Dimorphic ◽  
Morphological Similarity ◽  
Related Taxon ◽  
Two New Species

The genus Anisoderomorpha Arrow, 1925 (Coleoptera: Erotylidae: Languriinae) is redescribed and two new species of Anisoderomorpha are described: A. tamdaoensis sp. nov. from Vietnam and A. malayana sp. nov. from Malaysia. The adults of A. tamdaoensis sp. nov. were found to be sexually dimorphic in external morphology, particularly in the shape of the head and mandibles: females have a large asymmetrical head and mandibles, whereas males have a symmetrical head with slightly asymmetrical mandibles. All three members of Anisoderomorpha and its related taxon, Celolanguria curvipes Arrow, 1925, are illustrated and the host plant of Anisoderomorpha is predicted based on the morphological similarity of the specified mouthparts to those of other genera. 

scholarly journals Population connectivity of the crab Gandalfus yunohana (Takeda, Hashimoto & Ohta, 2000) (Decapoda: Brachyura: Bythograeidae) from deep-sea hydrothermal vents in the northwestern Pacific

2020 ◽  
Vol 40 (5) ◽  
pp. 556-562
Author(s):  
Hiromi K Watanabe ◽  
Chong Chen ◽  
Shigeaki Kojima ◽  
Shogo Kato ◽  
Hiroyuki Yamamoto
Keyword(s):  
Deep Sea ◽  
Hydrothermal Vents ◽  
Okinawa Trough ◽  
Coi Gene ◽  
Genetic Connectivity ◽  
Reverse Direction ◽  
Northwestern Pacific ◽  
Brachyuran Crab ◽  
The Okinawa Trough ◽  
Mariana Arc

Abstract Genetic connectivity provides a basis for evaluating the resilience of animal communities by elucidating gene flow and serves as a proxy for realized dispersal through planktonic larval dispersal, settlement, and reproductive success. Gandalfus yunohana (Takeda, Hashimoto & Ohta, 2000) is a brachyuran crab endemic to deep-sea hydrothermal vents in the northwestern Pacific. Although an iconic and often dominant species, the connectivity among its populations is yet to be examined. We obtained barcoding sequences of the mitochondrial COI gene of G. yunohana from four vent fields including two on the Izu Arc, one on the northern Mariana Arc, and one in the Okinawa Trough. Genetic diversity of populations on the Izu and northern Mariana arcs were similar and shared the dominant haplotypes, showing no genetic subdivision regardless of the habitat depth. The Okinawa Trough population, for which only one specimen was available, was not genetically different from specimens from the Izu/Mariana arc populations. Estimation of the number of immigrants among populations suggests that the migration from north to south is higher than in the reverse direction. Our results resonate with previous laboratory-culture experiments, suggesting a high dispersal capability for G. yunohana. Visual observations and sampling, however, suggest that G. yunohana is exceedingly rare in the Okinawa Trough. This perhaps results from a lack of sufficient larval supply from the Izu-Bonin-Mariana Arc vents, and there may not be a reproductive population in the Okinawa Trough.

scholarly journals Description of two new species of Dorsiceratus Drzycimski, 1967 (Copepoda: Harpacticoida: Ancorabolidae) from Sedlo and Seine Seamounts (Northeastern Atlantic) and remarks on the phylogenetic status of the genus

Zootaxa ◽  
2009 ◽  
Vol 2096 (1) ◽  
pp. 257-286 ◽  
Author(s):  
KAI HORST GEORGE ◽  
CHRISTOPH PLUM
Keyword(s):  
New Species ◽  
The Other ◽  
Sexually Dimorphic ◽  
Diagnostic Features ◽  
Abdominal Somite ◽  
Clear Cut ◽  
Outer Seta ◽  
Phylogenetic Status ◽  
Two New Species ◽  
Northeastern Atlantic

Two new species of Dorsiceratus Drzycimski, 1967 (Copepoda, Harpacticoida, Ancorabolidae), Dorsiceratus wilhelminae sp. nov. and D. dinah sp. nov. are described from Sedlo and Seine Seamounts, respectively (both northeast Atlantic). These are the first records of Dorsiceratus species from seamount summits. Both new species resemble the described species D. octocornis Drzycimski, 1967, D. triarticulatus Coull, 1973, and D. ursulae George, 2006, with respect to most morphological features. On the other hand, D. wilhelminae sp. nov. has long spinules at the inner margin of the A2 enp, while D. dinah sp. nov. bears two, rather than one, tubepores dorsally on third abdominal somite, and a geniculate first outer seta on P1 exp2. These characters are considered as apomorphic relative to the described Dorsiceratus species. As discussed in the present paper, the maintenance of a genus Dorsiceratus appears to be problematic. Although specimens may be assigned without difficulty to a group “Dorsiceratus”, such assignments are based on diagnostic features only; no clear-cut apomorphies have been detected so far to characterize the monophyly of Dorsiceratus. Just two apomorphic characters appear to be synapomorphies for all of the described Dorsiceratus species: 1) P2 enp2 with one rather than two setae and 2) P4 exp sexually dimorphic. Unfortunately, these features are relatively widespread within the Ceratonotus-group sensu Conroy-Dalton (2001) and therefore of rather low value. The authors decided, however, to retain the genus Dorsiceratus until new insights provide more information to support or disprove that hypothesis.

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.

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