scholarly journals Balakhchino VIa Site Neolithic Complex in the Kama Mouth Region

2019 ◽  
Vol 1 (27) ◽  
pp. 47-58
Author(s):  
Aleksandr A. Vybornov ◽  
◽  
Anton V. Shipilov ◽  
Keyword(s):  
Mouth Region

Autumn Migration of Waders (Charadrii) at the Reda Mouth (N Poland)

Ring ◽  
2009 ◽  
Vol 31 (1) ◽  
pp. 23-39 ◽  
Author(s):  
Włodzimierz Meissner ◽  
Anna Włodarczak-Komosińska ◽  
Dariusz Górecki ◽  
Cezary Wójcik ◽  
Mateusz Ściborski ◽  
...  
Keyword(s):  
Migration Pattern ◽  
Egg Laying ◽  
Autumn Migration ◽  
Tundra Zone ◽  
Age Classes ◽  
Calidris Alpina ◽  
Mouth Region ◽  
Baltic Coast ◽  
Northern Latitudes ◽  
Vanellus Vanellus

Autumn Migration of Waders (Charadrii) at the Reda Mouth (N Poland) The migration of waders was investigated at the Reda mouth (Polish Baltic coast) between 1996 and 2001. During the study 496 counts were conducted in the period between 5 July and 5 October. The most numerous species observed were: the Lapwing (Vanellus vanellus) - 39.5% and Dunlin (Calidris alpina) - 29.8% of all waders. Because of a variety of habitats in the Reda mouth region, among the waders staging numerously in the Reda mouth there were species typical both for coastal and inland habitat. It was shown that birds from tundra zone migrated later than those from more southern breeding areas, which was caused by much later beginning of egg laying in northern latitudes. Moreover, in the species from tundra zone, e.g. the Knot (Calidris canutus), Little Stint (C. minuta), Curlew Sandpiper (C. ferruginea), the migration of both age classes were well separated, whereas in those from more southern areas, e.g. the Little Ringed Plover (Charadius dubius), Common Sandpiper (Actitis hypoleucos), such difference was less pronounced and the period of common passage of adults and juveniles was much longer. A comparison of the obtained data on migration pattern with some other sites in Poland where regular counts were conducted showed several similarities and some discrepancies, which are discussed in the paper.

Syntaxonomical diversity of vegetation of the Dnieper mouth region III Class Phragmito-Magnocaricetea Klika in Klika et Novak 1941. Orders Magnocaricetalia Pignatti 1953 and Nasturtio-Glycerietalia Pignatti 1953

2009 ◽  
pp. 15-36
Author(s):  
D. V. Dubyna ◽  
T. P. Dziuba
Keyword(s):  
Mouth Region ◽  
Community Protection

Syntaxonomy of the orders Magnocaricetalia and Nasturtio-Glycerietalia in the Dnieper mouth region is developed. There have been described 14 asso­ciations belonging to the four alliances: Magnocaricion elatae, Cicution virosae, Glycerio-Sparganion and Phalaridion arundinaceae. Also in the article phyto­coenotic tables are presented. The problems of syntaxo­nomy and rare community protection are discussed.

Revision of European and North African Folsomides Stach with special emphasis on the Canarian fauna (Collembola: Isotomidae)

1992 ◽  
Vol 23 (4) ◽  
pp. 453-473 ◽  
Author(s):  
Arne Fjellberg
Keyword(s):  
New Species ◽  
Canary Islands ◽  
Morphological Characters ◽  
Maxillary Palp ◽  
North African ◽  
African Species ◽  
Mouth Region ◽  
Generic Rank ◽  
Number Of Species ◽  
Narrow Definition

AbstractThe genus Folsomides Stach, 1922 is redefined and given a narrow definition based on a limited set of consistent morphological characters: Position and distribution of tergal macrosensilla, chaetotaxy of mouth region, tibiotarsi, ventral tube and furca. Eighteen new species are described from the Canary Islands: semiparvulus sp. n., xerophilus sp. n., vinosus sp. n., cumbrosus sp. n., unicus sp. n., terrus sp. n., pocosensillatus sp. n., nigrocellatus sp. n., teno sp. n., oromii sp. n., ononicolus sp. n., graminis sp. n., famarensis sp. n., pinicolus sp. n., intermedius sp. n., tonellus sp. n., supranubius sp. n. and analuisae sp. n. The following European/African species are redescribed: parvulus Stach, portucalensis Gama, angularis (Axelson), cf. petiti Delamare, lawrencei Gers & Deharveng, cf. zairensis Martynova, nanus Ellis and centralis (Denis). Highly discriminate species characters are found in maxillary palp, tibiotarsal chaetotaxy and distribution of tergal microsensilla. A number of species are removed from Folsomides, and Subisotoma Stach, 1947 is given generic rank.

A subcuticular endoparasite impaling bdelloid rotifers using three-pronged spores

1981 ◽  
Vol 59 (7) ◽  
pp. 1207-1212 ◽  
Author(s):  
G. L. Barron ◽  
S. S. Tzean
Keyword(s):  
Bdelloid Rotifers ◽  
Mouth Region ◽  
Subcuticular Space ◽  
Infection Hypha

Triacutus subcuticularis is described as an endoparasite of bdelloid rotifers. The infection hypha does not establish in the visceral tissue but grows in the pseudocoel between the cuticle and the epidermis. In this location the thallus grows and divides repeatedly to produce numerous unicellular assimilative segments which pack the subcuticular space of the living host. After death, each hyphal segment produces one or several filiform extensions which bear solitary one-celled, three-pronged spores at the apex. Infection is initiated by the spore impaling the rotifers in the mouth region.

Composition of the genus Loricella (Mollusca: Polyplacophora: Loricidae) and the description of two new species

Zootaxa ◽  
2021 ◽  
Vol 4981 (2) ◽  
pp. 275-300
Author(s):  
BORIS SIRENKO
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Central Area ◽  
Dorsal Side ◽  
Morphological Features ◽  
Related Genus ◽  
Mouth Region ◽  
Two New Species ◽  
Scanning Electron

The genus chiton Loricella is revised. It comprises nine species. Two of these species, L. neoguinensis n. sp. and L. solomonensis n. sp., are described as new. Based on the analysis of morphological features studied using a scanning electron microscope, a revised diagnosis of the genus is provided. The characters diagnostic for this that distinguish it from the related genus Squamophora are as follows: a tubular hollow inside the dorsal scales, bristles on the dorsal side of the girdle, a wide ventral mouth region, a narrow mantle fold covered with simple longitudinally ribbed scales, smooth ventral scales, pits arranged in longitudinal rows in the central area of the tegmentum, and a bicuspid head of the major lateral teeth of the radula. 

Location-Probability Profiles for the Mouth Region of Human Primary Motor–Sensory Cortex: Model and Validation

NeuroImage ◽  
2001 ◽  
Vol 13 (1) ◽  
pp. 196-209 ◽  
Author(s):  
Peter T. Fox ◽  
Aileen Huang ◽  
Lawrence M. Parsons ◽  
Jin-Hu Xiong ◽  
Frank Zamarippa ◽  
...  
Keyword(s):  
Sensory Cortex ◽  
Mouth Region

scholarly journals Preliminary Note on the Structure and Affinities of Phoronis

1897 ◽  
Vol 21 ◽  
pp. 59-71 ◽  
Author(s):  
Arthur T. Masterman
Keyword(s):  
Distinct Species ◽  
Systematic Position ◽  
Nerve Ring ◽  
The Body ◽  
Serial Sections ◽  
Preliminary Note ◽  
Mouth Region ◽  
Careful Comparison ◽  
A New Species ◽  
Different Parts

In spite of the great amount of attention which has been bestowed upon this group by many workers, it must still be said that our knowledge of its systematic position is very meagre and uncertain, and that there are points in its anatomy which require elucidation. Through the kindness of Professor M‘Intosh I have been enabled to examine some specimens of P. australis, and also a Phoronis, which appears to be a new species. I reserve a detailed account of my results for later publication, and here only refer very briefly to leading points. I may mention that Professor M‘Intosh has also allowed me the inspection of his serial sections of P. buskii. M‘Intosh, and after a careful comparison I have not the slightest doubt that this is a distinct species from P. australis—it has been usual to regard the distinction between these two forms as not of specific value.Divisions of the Body.—It is usual, in describing the structure of Phoronis, to refer to two different parts of the body which lie before and behind the septum respectively. I propose, for reasons shown later, to emphasise the division of the body into—(1) The epistome, lying dorsally to the mouth, and having very definite, though somewhat involved, relationship to the next part; (2) the tentacular region, which I prefer to call the collar, consisting of a ring round the mouth region, the oral part being produced into two arms or processes which bear tentacles and are coiled, and the aboral end being limited superficially by the nerve ring and fundamentally by the so-called septum; (3) the trunk, including all the region behind the septum.

Evolutionary roots of the conodonts with increased number of elements in the apparatus

2015 ◽  
Vol 106 (1) ◽  
pp. 29-53 ◽  
Author(s):  
Jerzy Dzik
Keyword(s):  
Evolutionary History ◽  
Late Ordovician ◽  
P Element ◽  
Early Event ◽  
High Latitudes ◽  
Mouth Region ◽  
Shared Ancestry ◽  
Early Late ◽  
Element Pair ◽  
Element Series

ABSTRACTFour kinds of robust elements have been recognised in Amorphognathus quinquiradiatus Moskalenko, 1977 (in Kanygin et al. 1977) from the early Late Ordovician of Siberia, indicating that at least 17 elements were present in the apparatus, one of them similar to the P1 element of the Early Silurian Distomodus. The new generic name Moskalenkodus is proposed for these conodonts with a pterospathodontid-like S series element morphology. This implies that the related Distomodus, Pterospathodus and Gamachignathus lineages had a long cryptic evolutionary history, probably ranging back to the early Ordovician, when they split from the lineage of Icriodella, having a duplicated M location in common. The balognathid Promissum, with a 19-element apparatus, may have shared ancestry with Icriodella in Ordovician high latitudes, with Sagittodontina, Lenodus, Trapezognathus and Phragmodus as possible connecting links. The pattern of the unbalanced contribution of Baltoniodus element types to samples suggests that duplication of M and P2 series elements may have been an early event in the evolution of balognathids. The proposed scenario implies a profound transformation of the mouth region in the evolution of conodonts. The probable original state was a chaetognath-like arrangement of coniform elements; all paired and of relatively uniform morphology. This was modified at the origin of protopanderodontids by the introduction of a medial S0 element, which resulted in the separation of the exposed unit of M and S series elements from the P series elements hidden in the throat. A rotation of the S series elements to an almost horizontal position in early prioniodontids may have promoted duplication of the M element pair. In Gamachignathus, Icriodella and Pterospathodus lineages, these elements are differentiated morphologically. Subsequent anteriorward bending of the P element series caused duplication of the balognathid P2 element pair, but they remained undifferentiated, even in the otherwise elaborate Promissum. The whole clade of conodonts with supernumerary element pairs in the apparatus has its roots in high latitudes of the Ordovician.

scholarly journals Cytological Studies of the Nematocysts of Hydra

1959 ◽  
Vol 5 (1) ◽  
pp. 69-77 ◽  
Author(s):  
George B. Chapman ◽  
Lewis G. Tilney
Keyword(s):  
Thermal Expansion ◽  
Electron Microscope ◽  
Dense Matrix ◽  
Tubular Structures ◽  
Interference Microscope ◽  
Mouth Region ◽  
Different Types ◽  
The Matrix ◽  
Ultrathin Sections ◽  
Supporting Structures

Entire hydras or tentacles were fixed in OsO4 or in KMnO4 and thereafter washed, dehydrated, and embedded in a methacrylate mixture. Ultrathin sections were cut on an experimental model, thermal expansion type ultramicrotome or on a Porter-Blume microtome. The sections were examined in an RCA electron microscope. Type EMU-2 D. "Squash preparations" for light microscopy, were made from the hydra mouth region and the attached tentacles. These were observed with an AO Baker interference microscope. In the mature organism, three of the four types of nematocysts normally found in hydra could be positively identified with the electron microscope. The desmonemes, the smallest type, have a dense matrix and a thin capsule. The two different types of mature isorhizas could not be distinguished with certainty. They are intermediate in size between the desmonemes and stenoteles and have a capsule with a dense matrix. The cnidocil, or triggering hair, which is composed of a dense core and a fibrillar sheath has nine supporting elements arranged in a semi-circle near its base. Twenty "supporting structures" are arranged around the nematocyst capsule and interconnections between the supporting elements and these latter structures have been observed. Development of the nematocysts involves an increase in density of the matrix. Spines can be seen in the interior of tubular structures within the capsules of the holotrichous isorhizas.

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