Paralomis White, 1856 (Crustacea: Decapoda: Anomura) from India, with morphological variability in Paralomis indica Alcock & Anderson, 1899

Zootaxa ◽  
2022 ◽  
Vol 5091 (2) ◽  
pp. 301-329
Author(s):  
SHIVAM TIWARI ◽  
VINAY P. PADATE ◽  
VISHNU K. VENUGOPALAN ◽  
SHERINE SONIA CUBELIO ◽  
MASATSUNE TAKEDA
Keyword(s):  
Bay Of Bengal ◽  
Morphological Variability ◽  
Andaman Sea ◽  
Nicobar Island ◽  
Base Pairs ◽  
Southeastern Arabian Sea ◽  
The Indian Ocean ◽  
Western Bay Of Bengal ◽  
First Time ◽  
Mitochondrial Cytochrome Oxidase

Deep-water king crabs of the genus Paralomis White, 1856 collected during three cruises of the Fishery Oceanographic Research Vessel Sagar Sampada in the western Bay of Bengal (528–777 m depths), one cruise in the eastern Bay of Bengal off Great Nicobar Island (337 m depth), and four cruises in the southeastern Arabian Sea (315–1245 m) were identified. They are referred to Paralomis ceres Macpherson, 1989, recorded for the first time from Indian waters and P. indica Alcock & Anderson, 1899, reported for the first time from the Bay of Bengal and the Andaman Sea. In addition, this study reports the morphological variability among the P. indica populations in the shape of the carapace and dorsal rostral spines, nature of the branchial and cardiac regions and abdominal marginal spines, and the relative lengths of pereopods 2–4. Mitochondrial Cytochrome oxidase I (594 base pairs) and 16S rRNA (503 bp) gene sequences of P. ceres and P. indica (602 and 497 bp, respectively) revealed that they formed distinct lineages. A key to the Indian Ocean species of Paralomis is provided.  

scholarly journals Deoxygenation in Marginal Seas of the Indian Ocean

2021 ◽  
Vol 8 ◽  
Author(s):  
S. Wajih A. Naqvi
Keyword(s):  
Indian Ocean ◽  
Oxygen Content ◽  
Red Sea ◽  
Bay Of Bengal ◽  
Persian Gulf ◽  
Oxygen Demand ◽  
Andaman Sea ◽  
Marginal Seas ◽  
The Indian Ocean ◽  
Oxygen Minimum

This article describes oxygen distributions and recent deoxygenation trends in three marginal seas – Persian Gulf and Red Sea in the Northwestern Indian Ocean (NWIO) and Andaman Sea in the Northeastern Indian Ocean (NEIO). Vertically mixed water column in the shallow Persian Gulf is generally well-oxygenated, especially in winter. Biogeochemistry and ecosystems of Persian Gulf are being subjected to enormous anthropogenic stresses including large loading of nutrients and organic matter, enhancing oxygen demand and causing hypoxia (oxygen < 1.4 ml l–1) in central and southern Gulf in summer. The larger and deeper Red Sea is relatively less affected by human activities. Despite its deep water having remarkably uniform thermohaline characteristics, the central and southern Red Sea has a well-developed perennial oxygen minimum at mid-depths. The available data point to ongoing deoxygenation in the northern Red Sea. Model simulations show that an amplified warming in the marginal seas of the NWIO may cause an intensification of the Arabian Sea oxygen minimum zone (OMZ). Increases in particulate organic carbon and decreases in oxygen contents of the outflows may also have a similar effect. In the Andaman Sea, waters above the sill depth (∼1.4 km) have characteristics similar to those in the Bay of Bengal, including an intense OMZ. As in the case of the Bay of Bengal, oxygen concentrations within the Andaman Sea OMZ appear to have declined slightly but significantly between early 1960s and 1995. The exceedingly isothermal and isohaline water that fills the deep Andaman Basin is also remarkably homogenous in terms of its oxygen content. A very slight but statistically significant decrease in oxygen content of this water also seems to have occurred over three decades preceding 1995. New information is badly needed to assess the extent of further change that may have occurred over the past 25 years. There have been some reports of coastal “dead zones” having developed in the Indian Ocean marginal seas, but they are probably under-reported and the effects of hypoxia on the rich and diverse tropical ecosystems – coral reefs, seagrasses, and mangroves – in these seas remain to be investigated.

Review of the Indian Ocean spikefish genus Mephisto (Tetraodontiformes: Triacanthodidae)

Zootaxa ◽  
2020 ◽  
Vol 4802 (1) ◽  
pp. 82-98
Author(s):  
KATHERINE E. BEMIS ◽  
JAMES C. TYLER ◽  
PETER N. PSOMADAKIS ◽  
LAUREN NEWELL FERRIS ◽  
APPUKUTTANNAIR BIJU KUMAR
Keyword(s):  
Indian Ocean ◽  
Bay Of Bengal ◽  
East Coast ◽  
Andaman Sea ◽  
Micro Ct ◽  
Tooth Replacement ◽  
Color Photograph ◽  
Replacement Pattern ◽  
The Indian Ocean ◽  
Ct Data

We redescribe the triacanthodid spikefish Mephisto fraserbrunneri Tyler 1966 based upon eight specimens (five newly reported herein) and the first color photographs of freshly collected specimens; these data are compared with that of the single specimen of the recently described M. albomaculosus Matsuura, Psomadakis, and Mya Than Tun 2018. Both species are found in the Indian Ocean, with M. fraserbrunneri known from the Arabian Sea off the east coast of Africa to the eastern Bay of Bengal, and M. albomaculosus confirmed only from the type locality in the Andaman Sea (a color photograph of an individual M. cf. albomaculosus from the Bay of Bengal that was not retained is also presented). We describe and diagnose the genus Mephisto and provide a key to the two species based upon all available specimens. We also provide a distribution map for both species and summarize literature records. Using micro-CT data, we show that Mephisto fraserbrunneri replaces teeth intraosseously, which suggests this tooth replacement pattern is plesiomorphic for Tetraodontiformes. 

The bryozoan genus Arbocuspis (Cheilostomata, Electridae) from the Indian Ocean, with description of a new species from off southwestern Thailand, Andaman Sea

Zootaxa ◽  
2017 ◽  
Vol 4282 (1) ◽  
pp. 95 ◽  
Author(s):  
ANTONIETTA ROSSO ◽  
FRANCESCO SCIUTO ◽  
ROSSANA SANFILIPPO ◽  
MARY SPENCER JONES
Keyword(s):  
New Species ◽  
Fossil Record ◽  
Andaman Sea ◽  
Microscope Images ◽  
Living Species ◽  
The Indian Ocean ◽  
Cryptogenic Species ◽  
First Time ◽  
A New Species ◽  
Scanning Electron

Arbocuspis is a bryozoan genus, so far lacking a fossil record. It includes a few, essentially intertropical, living species, all until recently considered as mere varieties of the genotype species Membranipora bellula Hincks, 1881. Scanning electron microscope images of type material are presented for the first time for Arbocuspis bicornis Hincks, 1881 from Ceylon and Arbocuspis multicornis Hincks, 1881 from Australian waters, together with a modern description for this latter species. A new species, Arbocuspis emanuelae n. sp., is erected for specimens from the Andaman Sea. Arbocuspis emanuelae is easily distinguishable from congeners because of its two symmetrically branching spines overarching the opesium, and the group of pointed unbranched spines between them. Species of Arbocuspis are especially adapted to colonise shallow-water habitats and ephemeral substrata, and their apparently wide distributions possibly result from natural and/or anthropogenic-mediated transport, and/or also point to complexes of cryptogenic species. The diagnosis of the genus is amended owing to the occurrence in A. emanuelae n. sp. of several kinds of kenozooids, which were unreported from previously known species. 

scholarly journals Tubuca alcocki, a new pseudocryptic species of fiddler crab from the Indian Ocean, sister to the southeastern African T. urvillei (H. Milne Edwards, 1852) (Crustacea, Decapoda, Brachyura, Ocypodidae)

ZooKeys ◽  
2018 ◽  
Vol 747 ◽  
pp. 41-62 ◽  
Author(s):  
Hsi-Te Shih ◽  
Benny K.K. Chan ◽  
Peter K.L. Ng
Keyword(s):  
New Species ◽  
Indian Ocean ◽  
Fiddler Crab ◽  
Divergence Time ◽  
Molecular Data ◽  
Sensu Stricto ◽  
Andaman Sea ◽  
The Indian Ocean ◽  
Mitochondrial Cytochrome Oxidase ◽  
Pseudocryptic Species

A new pseudocryptic species of fiddler crab,Tubucaalcockisp. n., is described from the northern Indian Ocean. The new species was previously identified withT.urvillei(H. Milne Edwards, 1852), but can be distinguished by the structures of the anterolateral angle of the carapace and male first gonopod. The molecular data of the mitochondrial cytochrome oxidase subunit I gene shows that both are sister taxa and the divergence time is estimated at 2.2 million years ago, around the beginning of the Pleistocene. While the new species is widely distributed in the northern part of Indian Ocean, occurring from the Red Sea to India and the Andaman Sea;T.urvilleisensu stricto has a more restricted range, and is known only from southeastern Africa.

scholarly journals Notes on the Foraminiferal Genera <i>Laterostomella</i> De Klasz and Rérat and <i>Streptochilus</i> Brönnimann and Resig

1989 ◽  
Vol 8 (2) ◽  
pp. 215-225 ◽  
Author(s):  
Ivan De Klasz ◽  
Dick Kroon ◽  
Jan E. Van Hinte
Keyword(s):  
North Atlantic ◽  
Morphological Variability ◽  
Isotopic Data ◽  
General Shape ◽  
The North ◽  
The Pacific ◽  
Upper Cenozoic ◽  
The Indian Ocean ◽  
The North Atlantic ◽  
First Time

Abstract. the biserial foraminiferal genera Laterostomella de Klasz &amp; Rérat (1962) and Streptochilus Brönnimann &amp; Resig (1971) have been described from the Miocene of Gabon and from Miocene to Recent levels of the Pacific and Indian Oceans, respectively. Both genera have since been found in the Upper Cenozoic of other regions: Laterostomella at Rockall Bank in the North Atlantic and in Papua-New-Guinea, and modern Streptochilus specimens were collected with plankton nets in the northern part of the Indian Ocean. The apertural characteristics of Laterostomella and Streptochilus show marked similarities as does the general shape of Laterostomella guembeliniformis with some Streptochilus species. However, other Laterostomella species have a very different form and isotopic data indicate that Laterostomella has a benthic and Streptochilus a planktic life habitat. We conclude that both genera are valid. For the first time SEM pictures of Laterostomella species are presented to show morphological variability, surface texture and aperture types.

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