A revision of the genus<i>Alvinocaris</i>Williams and Chace (Crustacea: Decapoda: Caridea: Alvinocarididae), with descriptions of a new genus and a new species of<i>Alvinocaris</i>

Subseafloor Biosphere Linked to Hydrothermal Systems

2014

In deep-sea hydrothermal vent fields, faunal distribution is associated with geochemical environments generated by hydrothermal vent activity. The Okinawa Trough is located between the Eurasian Continent and the Ryukyu Arc, and is characterized by sedimentassociated fauna associated with vents. In this chapter, the faunal distribution in hydrothermal vent fields in the Okinawa Trough is summarized at inter-and intra-field levels, and its relationship with geochemical environments and species-specific ecologies is discussed. Although the zonation of sediment-associated fauna is not distinct, the fauna on rocky seabed can be categorized into four zones based on thermal conditions. Genetic connectivity among conspecific populations in the Okinawa Trough appears to be common; further, a few faunal groups, such as tubeworms, show connectivity to regions outside of the Okinawa Trough. The faunal composition of vent communities in the Okinawa Trough has been categorized into three groups: the Minami-Ensei Knoll, Yoron Hole, and middlesouthern Okinawa Trough. To determine more precisely the relationships between faunal composition and environmental factors in the Okinawa Trough vent fields, both generalized and vent-specific environmental factors should be measured simultaneously with quantitative faunal sampling for analyses. Keywords

Section: Distribution and Connectivity Of Vent Fauna In The Okinawa Tmentioning

confidence: 99%

Vent Fauna in the Okinawa Trough

Subseafloor Biosphere Linked to Hydrothermal Systems

2014

“…Four Alvinocaris shrimps, namely, A. longirostris, A. dissimilis, A. brevitelsonis, and an undescribed species inhabit the Okimawa Trough (Komai and Segonzac 2005;Fujikura et al 2012;Yahagi et al, unpublished data). This undescribed species was also collected from the Suiyo Seamount in the Izu-Ogasawara Arc (Yahagi et al, unpublished data).…”

Section: Vent/seep Faunas Of Neighboringmentioning

confidence: 99%

Vent Fauna in the Mariana Trough

Subseafloor Biosphere Linked to Hydrothermal Systems

2014

“…Alvinocaris is typically characterized by a slender rostrum with dorsal teeth, the well-developed postrostral ridge extending beyond the mid-length of the carapace, the dorsolateral spines on the telson arranged in a linear row, the possession of a small spiniform tubercle on the anterior surface of the eye, the dactyli of the third to fifth pereopods bearing accessory spinules arranged in a single row, and the presence of meral spines on the third and fourth pereopods (Komai & Segonzac 2005). The new species is assigned to Alvinocaris without hesitation on account of these characters.…”

Section: Taxonomymentioning

confidence: 99%

“…During the research project "Quest for the Limit of Life (QUELLE) 2013" by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), the chemosynthetic assemblages of the recently discovered Dodo and Solitaire hydrothermal vent fields on the Central Indian Ridge (Nakamura et al 2012) were investigated. Among the Komai & Segonzac (2005) peripheral vent biota, one specimen of caridean shrimp was sampled. Subsequent morphological examination of this shrimp and analyses of partial sequences of the mitochondrial COI gene have revealed that the specimen represents an undescribed species of the genus Alvinocaris.…”

Section: Introductionmentioning

confidence: 99%

First record and a new species of Alvinocaris Williams & Chace, 1982 (Crustacea: Decapoda: Caridea: Alvinocarididae) from the Indian Ocean

Yahagi

et al. 2014

Zootaxa

Self Cite

A new species of the alvinocaridid shrimp genus Alvinocaris Williams & Chace, 1982 is described from the Solitaire hydrothermal vent field at 2606 m depth on the Central Indian Ridge. Alvinocaris solitaire sp. nov., the first species of the genus to be recorded from the Indian Ocean, is morphologically most similar to A. lusca Williams & Chace, 1982 from the Galapagos Rift, East Pacific Rise. The new species is distinguished from A. lusca by the less produced pterygostomial angle of the carapace, the presence of small teeth on the posterolateral margin of the third pleuron, and the lack of short plumose setae on the posteromedian margin of the telson. The genetic divergence of the mitochondrial cytochrome c oxidase subunit I (COI) gene (600 bp) among the nine Alvinocaris species analyzed clearly indicates that the new taxon is distinct from the congeneric species for which genetic data are available.