Acid secretion in the Pacific Ocean gastropods

1969 ◽  
Vol 17 (5) ◽  
pp. 755 ◽  
Author(s):  
TE Thompson
Keyword(s):  
Electron Microscope ◽  
Pacific Ocean ◽  
Acid Secretion ◽  
Sulphuric Acid ◽  
Epidermal Cell ◽  
Goblet Cells ◽  
The Other ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Similar Appearance

Acid secretion is recorded for 22 species of Pacific Ocean gastropods. Pleurobranchus peroni, Cypraea clandestina, C. spadicea, and Lamellaria sp. were investigated in detail. It was established that the "empty" epidermal cells of P. peroni elaborate and secrete the acid and it is suggested that cells of similar appearance in the other species have the same function. The acid is discharged, following abrupt disturbance, by rupture of the epidermal acid cells in most species, but through permanent pores in Lamellaria sp. Tests suggest that the secretion is predominantly sulphuric acid. The structure of the epidermal acid cells was investigated with the electron microscope and the formation and coalescence of acid vacuoles are described. A second type of epidermal cell, found in P. peroni and C. spadicea, contains longitudinally striated material and is believed to play a mechanically supporting role. Mucous goblet cells and sparse epidermal cilia were also identified in various species.

A new species of Mysidium (Peracarida: Mysida: Mysidae) from the eastern tropical Pacific

2016 ◽  
Vol 97 (1) ◽  
pp. 113-117
Author(s):  
Manuel Ortiz ◽  
Michel E. Hendrickx ◽  
Ignacio Winfield
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
Tropical Pacific ◽  
The Other ◽  
Eastern Tropical Pacific ◽  
The Pacific ◽  
Appendix Masculina ◽  
The Pacific Ocean ◽  
A New Species

A new species of Mysidium from the eastern tropical Pacific, Mexico, is described, representing the second species of this genus described for the Pacific Ocean and the eighth species reported worldwide. Mysidium pumae sp. nov. is distinguished from the other species of the genus by several characters including: the lanceolate appendix masculina, 3× as long as wide, tapering distally, with a distal tuft of 16 setae and an inner proximal tuft of more than 30 setae, the male pleopod 4 with endopod bearing 3 setae, the exopod with 4 articles, the modified seta from article 3 of the exopod bifid, telson 2.3× as long as wide, distally concave. A table with the main differences among all the known species in the genus is provided.

First finding of anchialine and submarine cave dwelling brittle stars from the Pacific Ocean, with descriptions of new species of Ophiolepis and Ophiozonella (Echinodermata: Ophiuroidea: Amphilepidida)

Zootaxa ◽  
2018 ◽  
Vol 4377 (1) ◽  
pp. 1 ◽  
Author(s):  
MASANORI OKANISHI ◽  
YOSHIHISA FUJITA
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
The Other ◽  
Ryukyu Islands ◽  
Uniform Size ◽  
First Finding ◽  
The Pacific ◽  
The Ryukyu Islands ◽  
The Pacific Ocean ◽  
Submarine Cave

Two new species, Ophiolepis cavitata n. sp. and Ophiozonella cavernalis n. sp., are described from the specimens collected in shallow water submarine caves in the Ryukyu Islands, southwestern Japan. Ophiolepis cavitata n. sp. is distinguished from the other congeners in having prominent tubercle-shaped knobs on dorsal arm plates; two sizes of disc scales on the aboral disc, the larger surrounded by 3–8 times smaller disc scales; larger scales concave; radial shields wider than long; a trio of distinct scales present distal to each pair of radial shields; oral shields partly concave; 3 arm spines on proximal portion of the arms. Ophiozonella cavernalis n. sp. is distinguished from the other congeners in having polygonal, uniform size disc scales; oral shields almost as long as wide, shallow concave proximal sides that end in a fairly sharp point medially; arms about 9 times longer than disc diameter; 3 cylindrical arm spines, of which the oral most one is slightly larger than other 2 spines. Ophiozonella cavernalis n. sp. is the second finding of an anchialine-endemic ophiuroid and the first finding from the Pacific Ocean. 

SOME FURTHER RECORDS OF PELAGIC POLYCHAETA FROM THE NORTHEAST PACIFIC NORTH OF LATITUDE 40° N. AND EAST OF LONGITUDE 175° W., TOGETHER WITH RECORDS OF SIPHONOPHORA, MOLLUSCA, AND TUNICATA FROM THE SAME REGION

1960 ◽  
Vol 38 (4) ◽  
pp. 787-799 ◽  
Author(s):  
E. Berkeley ◽  
C. Berkeley
Keyword(s):  
Pacific Ocean ◽  
New Records ◽  
The Other ◽  
Pacific Region ◽  
Northeast Pacific ◽  
The Pacific ◽  
Northeastern Pacific ◽  
The Pacific Ocean

Seventeen species of pelagic Polychaeta from the northeastern Pacific are recorded. Of these, five (Sphaerosyllis pirifera Claparède, Dorvillea kefersteini McIntosh, Spiophanes cirrata Sars, Magelona sp., and Flabelligera affinis Sars) are species which, whilst not exclusively pelagic, are known to swim at some stage, particularly as larvae. One record (Pedinosoma curtum Reibisch) is new to the Pacific Ocean, two (Pontodora pelagica Greef and Callisona nasuta Greef) are new to the northeastern Pacific region, and four (Pelagobia longicirrata Greef, Lopadorhynchus uncinatus Fauvel, Sagitella kowalewskii Wagner, and Callizona angelini (Kinberg)) are records of northerly extensions of distribution. The first observation of a larval Cossura (probably of C. longocirrata Webster and Benedict) is recorded. Poeobius meseres Heath is recorded from a number of stations and the classification of Poeobiidae is discussed.Eight species of Siphonophora are listed, all of which constitute new records for the region covered by the present collections. Six species of Mollusca, comprising five Pteropoda and one Heteropoda, are recorded, none of which have been identified previously in northeastern Pacific plankton. Three of the genera of Pteropoda (Anopsia, Thliptodon, and Cliopsis) are characteristic of warmer seas, the other two, and the heteropod, are widely distributed. Of the two species of Tunicata listed one is new to the northeastern Pacific.

Mesosignum weddellensis sp. nov. (Crustacea: Asellota: Mesosignidae), a new isopod species from the abyssal Weddell Sea, Antarctica

Zootaxa ◽  
2004 ◽  
Vol 501 (1) ◽  
pp. 1
Author(s):  
MADHUMITA CHOUDHURY ◽  
ANGELIKA BRANDT
Keyword(s):  
Pacific Ocean ◽  
Southern Ocean ◽  
Weddell Sea ◽  
The Other ◽  
Similar Species ◽  
The Pacific ◽  
Significant Difference ◽  
The Pacific Ocean ◽  
Species Being

Mesosignum weddellensis sp. nov. is described from the abyssal Weddell Sea, Antarctica. This is the second record of Mesosignum from the Southern Ocean, the other known species being M. antarcticum Schultz, 1979. Mesosignum brevispinis Birstein, 1963 from the Pacific Ocean is the most similar species. The most significant difference is the length of the seventh pereonite, which is only half as long as the other pereonites in M. brevispinis, while in M. weddellensis it is as long as the other pereonites.

On the Pacific Ocean regime shift

2001 ◽  
Vol 28 (19) ◽  
pp. 3721-3724
Author(s):  
Cathy Stephens
Keyword(s):  
Pacific Ocean ◽  
Regime Shift ◽  
The Pacific ◽  
The Pacific Ocean
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