Notes on the brackish-water and marine species of Tubificidae [Annelida,Oligochaeta]

1963 ◽  
Vol 43 (3) ◽  
pp. 709-715 ◽  
Author(s):  
R. O. Brinkhurst
Keyword(s):  
Brackish Water ◽  
New Genus ◽  
Marine Species ◽  
Fresh Material

A re-investigation of fresh material makes it necessary to create the new genus Thalassodrilus for T. prostatus (Knollner). Careful adherence to generic and specific criteria as detailed leads to the recognition of nineteen brackish-water and marine Tubificidae, and some dubious entities are also listed.

New and little-known marine species of Pinaciophora, Rabdiaster and Thomseniophora gen. nov. (Rotosphaerida: Pompholyxophryidae)

2012 ◽  
Vol 93 (5) ◽  
pp. 1211-1229 ◽  
Author(s):  
Kenneth H. Nicholls
Keyword(s):  
Pacific Ocean ◽  
New Genus ◽  
Marine Species ◽  
Single Type ◽  
Haida Gwaii ◽  
Western Atlantic ◽  
Queen Charlotte Islands ◽  
Marine Habitats ◽  
Near Shore ◽  
One New Species

Near-shore benthic sediment samples collected at low tide from the western Atlantic Ocean (Sable Island, Nova Scotia, Canada) and the eastern Pacific Ocean (Haida Gwaii (Queen Charlotte Islands), British Columbia, Canada) were searched for little-known species of the rhizarian (Cercozoa) genera Pinaciophora, Rabdiaster and other related rotosphaerids. Several representatives with complete investitures of silica-scales (the structure of which is taxonomically diagnostic) were studied by transmission and scanning electron microscopy. The validity of the genus Pinaciophora (sensu Penard, 1904) as defined by a single type of plate-scale only, was strengthened by the discovery of Pinaciophora rubicunda and of another previously undescribed entity, both of which lacked spine-scales. Several earlier reports of loose scales from marine habitats, and erroneously identified as the freshwater P. fluviatilis, might be assigned to P. marina sp. nov. The new genus Thomseniophora was erected to include all ‘Pinaciophora' previously known to produce spine-scales and seven new taxa were described. Six other little-known species of Thomseniophora, Pinaciophora and Rabdiaster were described from the Canadian west coast (Pacific Ocean) including one new species of Pinaciophora. The addition of Thomseniophora brings the number of genera assigned to the Rotosphaerida to six: Pinaciophora, Thomseniophora, Rabdiaster, Rabdiophrys and Pompholyxophrys. The presence of several apparently closely related taxa in the same collection (same location and sampling date) strengthens the conclusion that relatively small differences in the morphology of their siliceous scales were more likely caused by genetic differences than by environmental influences.

Observations by Means of Cine Photography on the Behaviour of the Haptonema in Plankton Flagellates of the Class Haptophyceae

1971 ◽  
Vol 51 (1) ◽  
pp. 207-217 ◽  
Author(s):  
B. S. C. Leadbeater
Keyword(s):  
Fine Structure ◽  
Light Microscopy ◽  
Brackish Water ◽  
Type Species ◽  
Smooth Surface ◽  
Marine Species ◽  
Phaeocystis Globosa ◽  
The Third ◽  
Brackish Water Species ◽  
Water Species

INTRODUCTIONInitially the haptonema was recorded as a ‘little additional flagellum’ by Scherffel (1899) when he described Phaeocystis globosa. Similarly, the haptonema was referred to as the ‘third flagellum’ on the apparently tri-flagellate, brackish-water Prymnesium saltans Massart (Massart, 1920). Two further brackish water species of Prymnesium were described by Carter (1937) and all were characterized by a very short immobile ‘third appendage’. Lackey (1939) found a freshwater organism similar to Prymnesium but it possessed a ‘third flagellum’ several times the length of the true flagella. He re-corded that the third appendage was held out rigidly when the cell was at rest but during rapid swimming he was unable to see it and thought that this was due to an extremely rapid beat. He named his new organism Chrysochromulina parva and C. parva Lackey is now the type species of a considerable genus.Parke, Manton & Clarke (1955,1956,1958,1959) made a study of the light microscopy and fine structure of numerous marine species of Chrysochromulina. Their results showed that the ‘third flagellum’ differed in appearance and structure from that of a true flagellum and hence they decided to call this organelle a haptonema owing to its thread-like form and its ability to adhere to a smooth surface (Parke, Manton & Clarke, 1955). Their observations revealed that the haptonema could attach to a surface by an ‘adhesive tip’ and that the majority of species could coil their haptonemata into a helix and extend it again. In some species, e.g. C. strobilus (Parke, Manton & Clarke, 1959), the haptonema was usually tightly coiled whilst the cell was swimming.

scholarly journals A New Allogromiid Genus (Rhizopoda: Foraminiferida) from the Vellar Estuary, Bay of Bengal

1992 ◽  
Vol 11 (2) ◽  
pp. 233-239 ◽  
Author(s):  
Andrew J. Gooday ◽  
Olivia J. Fernando
Keyword(s):  
Bay Of Bengal ◽  
Brackish Water ◽  
New Genus ◽  
East Coast ◽  
First Record ◽  
Water Interface ◽  
East Coast Of India ◽  
Indian Waters ◽  
Vellar Estuary

Abstract. This paper reports what we believe to be the first record of allogromiid foraminifers from coastal Indian waters. Two species from the Vellar Estuary on the east coast of India south of Madras are described and placed in a new genus Vellaria. The foraminifers live at or near the sediment-water interface and are characterised by the development of a flared, conical or trumpet-shaped apertural structure which apparently serves to attach the test to small sand grains. Allogromiids are delicate and inconspicuous organisms which may be more widespread in esturine and brackish water settings than is currently realised.

scholarly journals A new genus and species of Hydrobiidae Stimpson, 1865 (Caenogastropoda, Truncatelloidea) from Peloponnese, Greece

ZooKeys ◽  
2021 ◽  
Vol 1037 ◽  
pp. 161-179
Author(s):  
Andrzej Falniowski ◽  
Jozef Grego ◽  
Aleksandra Rysiewska ◽  
Artur Osikowski ◽  
Sebastian Hofman
Keyword(s):  
New Species ◽  
Brackish Water ◽  
New Genus ◽  
Eastern Mediterranean ◽  
Eastern Mediterranean Region ◽  
Molecular Data ◽  
Reproductive Organs ◽  
Last Common Ancestor ◽  
Time Of Divergence ◽  
A New Species

Minute caenogastropod brackish-water gastropods, formerly classified as Hydrobia, are important elements of the brackish-water fauna and were objects of intensive study for many years. Until now, five genera have been distinguished, most of them represented by a number of species, but rather indistinguishable without molecular data (cytochrome oxidase subunit I – COI). In the eastern Mediterranean region, they are still poorly studied. In this paper, we present a new species of “Hydrobia” from the brackish Moustos spring, Arkadia, eastern Peloponnese, Greece. The shell, protoconch, radula, female reproductive organs, and penis are described and illustrated, together with the molecular (COI) relationships with other hydrobiids. All data confirm that these snails represent a distinct taxon, which must be classified as a new species belonging to a new genus. The formal descriptions are given. The closest, sister taxon is Salenthydrobia Wilke, 2003. The molecularly estimated time of divergence, 5.75 ± 0.49 Mya, coincides with 5.33 Mya, which is the time of the Oligocene flooding that terminated the Messinian salinity crisis. During the latter period, brackish “Lago-Mare” habitats were most probably suitable for the last common ancestor of Salenthydrobia and the newly described genus. Later, the Pliocene flooding isolated the Apennine and Peloponnese populations, promoting speciation.

scholarly journals I.—On The Distribution of the British Carboniferous Goniatites, with a Description of one New Genus and some New Species

1918 ◽  
Vol 5 (10) ◽  
pp. 434-450 ◽  
Author(s):  
Wheelton Hind
Keyword(s):  
New Species ◽  
New Genus ◽  
Presidential Address ◽  
British Museum ◽  
Forthcoming Paper ◽  
Special Importance ◽  
Fresh Material ◽  
Coal Measures

Part III of the Catalogue of the Fossil Cephalopoda in the British Museum (Nat. Hist.), by A. H. Foord and G. C. Crick, was published in 1897. Since then much fresh material has come into my hands and it is now possible to give much more accurate and fuller details of the horizons and localities at which the various species occur. This is of special importance, in view of the fact that the Goniatites can be used as zone indices of the Carboniferous Series from the upper part of the Dibunophyllum beds (D2 of Dr. Vaughan) up to the Middle Coal-measures. This I showed to be the case in my Presidential address to the Yorkshire Naturalists' Union, and published in the Naturalist, April to July, 1909, and elsewhere. Many details have, however, been added since then, and an elaborated and emended table will be published in a forthcoming paper by myself and Dr. Wilmore, F.G.S., on the Carboniferous succession of some Midland areas.

Dalytyphloplanida (Platyhelminthes: Rhabdocoela) from Andalusia, Spain, with the description of four new species

Zootaxa ◽  
2011 ◽  
Vol 2791 (1) ◽  
pp. 1 ◽  
Author(s):  
NIELS VAN STEENKISTE ◽  
BART TESSENS ◽  
KATHLEEN KRZNARIC ◽  
TOM ARTOIS
Keyword(s):  
New Species ◽  
Iberian Peninsula ◽  
Brackish Water ◽  
National Park ◽  
Seminal Receptacle ◽  
Marine Species ◽  
Species Level ◽  
Doñana National Park ◽  
Extreme Length

Nineteen taxa of Dalytyphloplanida Willems et al., 2006 collected from southwestern Andalusia are discussed. Although most taxa were found in freshwater, three are marine, one occurred in brackish water and Protoplanella simplex Reisinger, 1924 was even collected in a dry, limnoterrestrial habitat. Four taxa are new to science. Castrada purgatorialis n. sp., Castrada paradisea n. sp. and Strongylostoma devleeschouweri n. sp., all belong to the Typhloplanidae Graff, 1905. The first two species differ from other species of Castrada Schmidt, 1861 by the presence of a large accessory bursa and the morphology of the copulatory atrium. C. purgatorialis n. sp. has zoochlorellae while these are lacking in C. paradisea n. sp. Strongylostoma devleeschouweri n. sp. is unique because of its coalescing testes and because of the presence of a sphincter around the stalk of the seminal receptacle. Gieysztoria iberica n. sp. belongs to the Dalyelliidae Graff, 1905 and is characterized by the extreme length of the girdle of the stylet. Except for five taxa, all specimens were collected within the boundaries of the Doñana National Park. Most of the taxa could easily be identified to species level except for one taxon of Kytorhynchidae Rieger, 1974 and one species of Phaenocora Ehrenberg, 1836. Four species are new for the Iberian Peninsula. Three of these, Trigonostomum penicillatum (Schmidt, 1857) Micoletzky, 1910, Promesostoma maculosum Ax, 1956 and Gieysztoria macrovariata (Weise, 1942) Ruebush & Hayes, 1939, were already known from other European localities, whereas Parapharyngiella involucrum Willems et al., 2005, a marine species, has previously only been found in Zanzibar, Tanzania.

A Morphological and Electrophoretic Examination of Hydrobia Buccinoides, a Variable Brackish-Water Gastropod From Temperate Australia (Mollusca, Hydrobiidae)

1988 ◽  
Vol 36 (6) ◽  
pp. 661 ◽  
Author(s):  
WF Ponder ◽  
GA Clark
Keyword(s):  
Brackish Water ◽  
New Genus ◽  
New South ◽  
South Australia ◽  
Valid Species ◽  
Separate Species ◽  
Intrapopulation Variation ◽  
South Wales ◽  
Wide Range ◽  
Western Australian

The morphology of the abundant brackish-water hydrobiid snail known as 'Hydrobia buccinoides' is described. A new genus, Ascorhis, is provided for it and the valid species name for the southern (South Australia, Victoria, Tasmania) and eastern (New South Wales, Queensland) populations is shown to be victoriae T. Woods. The species name buccinoides is based on Assiminea tasmanica and is an earlier name for that species. Morphological and allozyme differences indicate that the Western Australian populations should be distinguished as a separate species and a new name (A. occidua) is provided for these. Both species show a considerable intrapopulation variation in shell sculpture. Salinity tolerance experiments on three Sydney populations indicate that Ascorhis victoriae tolerates a wide range of salinities, the middle of the preferred range being about that of normal seawater.

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