scholarly journals NEW GENERA AND SPECIES OF N. A. FULGORIDÆ

1902 ◽  
Vol 34 (10) ◽  
pp. 259-266 ◽  
Author(s):  
E. D. Ball
Keyword(s):  
New Genera ◽  
The Cross ◽  
General Appearance ◽  
Cross Vein

Anotia Kirkaldayin.sp.– Form and general appearance of Amalopota Fitchi, but broader and less definitely marked. Form of A. Burnetii, but with a sharp head and blunter elytra. Length, including elytra, 6.5 mm.Vertex slightly broader than in Burnetii, inclined upward, nearly flat, not rounding over at apex as in that species; elytra broader toward apices than in Burnetii; venation very similar, but with the median nervure not forked beyond the cross-vein, and the first branch of the postcostal nervure coming off close tot he cross-vein and at nearly right angles to the nervure. Costal appendix larger than in Burnetii, obliquely truncate posteriorly.

scholarly journals NOTE ON THE STRUCTURE OF NEPHOPTERYX ZIMMERMANI

1878 ◽  
Vol 10 (1) ◽  
pp. 19-19 ◽  
Author(s):  
A. R. Grote
Keyword(s):  
Transverse Ridge ◽  
The Third ◽  
Continuous Scale ◽  
The Cross ◽  
Cross Vein

The following note on the structure of Zimmermani is taken from a MS. paper on the N. Am. Phycidæ which I am preparing for publication. I would be glad of more material in this group from any correspondents.“Pinipestis (sub-gen. nov.).Maxillary palpi alike in both sexes, concealed by the porrect labial palpi, which have the third article erect and exceed the front. Ocelli present. Male antennæ very slightly bent at base, where they show slight continuous scale-tufts ; ciliate beneath. Fore wings with veins 4 and 5 running close together at base; these veins are seen to have a separate origin, 5 on the cross-vein close to 4, divaricating at one-third from base. Hind wings 8-veined ; vein 5 running close to 4 at base, but separate and continuous with the discal cross-vein. Head behind with a thick transverse ridge of scales; clypeus with a bunchlike projection of scales centrally.”

scholarly journals Crossveinless 2 contains cysteine-rich domains and is required for high levels of BMP-like activity during the formation of the cross veins in Drosophila

Development ◽  
2000 ◽  
Vol 127 (18) ◽  
pp. 3947-3959 ◽  
Author(s):  
C.A. Conley ◽  
R. Silburn ◽  
M.A. Singer ◽  
A. Ralston ◽  
D. Rohwer-Nutter ◽  
...  
Keyword(s):  
Signaling Pathway ◽  
Von Willebrand Factor ◽  
Secretory Pathway ◽  
Drosophila Wing ◽  
Transmembrane Sequence ◽  
The Cross ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Early Phases ◽  
Cross Vein

The BMP-like signaling mediated by the ligands Dpp and Gbb is required to reinforce the development of most veins in the Drosophila wing. However, the formation of the cross veins is especially sensitive to reductions in BMP-like signaling. We show here that the formation of the definitive cross veins occurs after the initial specification of the longitudinal veins in a process that requires localized BMP-like activity. Since Dpp and Gbb levels are not detectably higher in the early phases of cross vein development, other factors apparently account for this localized activity. Our evidence suggests that the product of the crossveinless 2 gene is a novel member of the BMP-like signaling pathway required to potentiate Gbb of Dpp signaling in the cross veins. crossveinless 2 is expressed at higher levels in the developing cross veins and is necessary for local BMP-like activity. The Crossveinless 2 protein contains a putative signal or transmembrane sequence, and a partial Von Willebrand Factor D domain similar to those known to regulate the formation of intramolecular and intermolecular bonds. It also contains five cysteine-rich domains, similar to the cysteine-rich domains found in Chordin, Short Gastrulation and Procollagen that are known to bind BMP-like ligands. These features strongly suggest that Crossveinless 2 acts extracelluarly or in the secretory pathway to directly potentiate Dpp or Gbb signaling.

scholarly journals NOTE ON THE DIURNALS

1898 ◽  
Vol 30 (8) ◽  
pp. 201-203
Author(s):  
A. Radcliffe Grote
Keyword(s):  
Common Species ◽  
Hawk Moth ◽  
The Media ◽  
The Cross ◽  
Parallel Case ◽  
The Individual ◽  
Cross Vein

Mancipium brassicœ.—Dr. Chapman writes me that certain specimens of this common species examined by him showed the very short veinlet III. 3+4. This veinlef constantly diminishes in size, progressing towards the tip of the wing to finally vanish, through many forms fo the Pieridœ. I had indeed expected it to be occasionally prersistent in brassicœ, although my preparations did not show it. It has disappeared in Pontia daplidice, in Nathalis iole, and strange to say in that curious and now isolated Pierid, Gonophlebia paradoxa. This variability, in one and the same species, is interesting because it follows the general evolutionary direction of the changes in the venation. Always the radial branches in the Pierids and other groups tend to diminish in number. Always the disintegration of the Media advances, until it finally disappears, as a system, from the surface of the wing (Rothschildia, Samia, Potamis, etc.). A parallel case to that of brassicœ is offered by Copismerinthus ocellata. In some specimens of this Hawk Moth, vein IV, is still thrown off from the cross vein of the hind wings, instead fo the Radius, which it has usually ascended to beyond the cell. We must regard these as instances of generalization in the individual, of a reversion to what was formerly the rule and is now becoming, by slow degrees, the exception.

Two Middle Jurassic hanging-flies (Insecta: Mecoptera: Bittacidae) from Northeast China

Zootaxa ◽  
2008 ◽  
Vol 1929 (1) ◽  
pp. 38-46 ◽  
Author(s):  
YAN-LI LI ◽  
DONG REN ◽  
CHUNG-KUN SHIH
Keyword(s):  
New Species ◽  
Middle Jurassic ◽  
Inner Mongolia ◽  
Northeast China ◽  
New Genera ◽  
Two New Species ◽  
Jiulongshan Formation ◽  
Cross Vein

Two new genera with two new species, Formosibittacus macularis gen. et sp. nov. and Jurahylobittacus astictus gen. et sp. nov. are described on the basis of well preserved specimens collected from the Jiulongshan Formation (Middle Jurassic) of Daohugou, Inner Mongolia, China. Formosibittacus can be distinguished from all known genera by a combination of the following features: three cross-veins between R 1 and R 2+3 ; one pterostigmal cross-vein; and two cross-veins between M 4 and CuA. Jurahylobittacus differs from all known genera by a combination the following of characters: one cross-vein between R 1 and R 2+3 ; one pterostigmal cross-vein; and two cross-veins between M 4 and CuA.

scholarly journals New extinct ant genus (Hymenoptera, Formicidae, Myrmicinae) from late Eocene Rovno amber

2021 ◽  
Vol 84 ◽  
pp. 271-282
Author(s):  
Alexander G. Radchenko ◽  
Maxim Yu. Proshchalykin
Keyword(s):  
Late Eocene ◽  
Morphological Features ◽  
Taxonomic Position ◽  
Rovno Amber ◽  
The Cross ◽  
Cross Vein

A new fossil myrmicine ant genus and species Lelejus venustusgen. et sp. nov., are described from late Eocene Rovno amber (Priabonian, 33.9–37.8 Ma). This genus differs from all extant and extinct Myrmicinae genera known from the late Eocene European ambers in the combination of morphological features, in particular: 13-segmented antennae with a very short scape and filiform funiculus; 3-segmented maxillary and 2-segmented labial palps; well-developed mandibles with dentate masticatory margin; scutum with broad notauli; forewings with closed cells 1+2r, 3r and mcu, the cell 3r of approximately the same length as cell 1+2r; free vein M branches off from RS approximately at the midlength between the junction of cross-vein 2r-rs with RS and vein m-cu; the cross-vein cu-a is located far from the base of wing, so the branch 1M+Cu is much longer than 2M+Cu. The taxonomic position of the described genus is discussed.

scholarly journals A NEW PAMPHILA

1885 ◽  
Vol 17 (2) ◽  
pp. 33-34
Author(s):  
G. H. French
Keyword(s):  
Outer Margin ◽  
Lower Half ◽  
Discal Cell ◽  
The Cross ◽  
Cross Vein

Pamphila myus, n. sp.Male.—Expanse .95 of an inch. Upper surface dark olivaceous brown, with a slight vinous reflection, about the same shade as cernes, which it much resembles. The primaries have the discal cell and the area in front of the cell like cernes, heavily washed with yellow of a little darker shade than that species, the same color ectending beyond the cell along the costal area three fourths the distance from the base to the outer margin (as the wings are spread); below the cell the same shade of yellow extends along the median vein the same distance, the area below this to the margin rather heavily sprinkled with yellow scales, except the space beyond the lower half of the stigma. This varies but little from the yellow of cernes. In cernes there is a quadrate sinus of the terminal dark brown of the wing dipping into the yellow beyond the cell, coming up to the cross vein. In this species the sinus is of the same width, but extends inward above the median vein, ending in a point half way to the base of the wing. The stigma is black, narrow, oblique, entire, though constricted below the middle, shorter than in cernes, does not reach the submedian below, and the upper end only reaches the second branch of the median, while in cernes it passes beyond this veinule, the lower third bent a little towards the base, in width not more than half as wide as in cernes; below the stigma an oblong patch of blackish scales that are bronzy in certain lights. Secondaries sprinkled with yellow scales, the inner half with yellowish hairs that are less olivaceous than in cernes.

A New Approach to the Demonstration of Oxidase-Localization Using Tannic Acid Or Catechin

1973 ◽  
Vol 31 ◽  
pp. 698-699
Author(s):  
V. Mizuhira ◽  
Y. Futaesaku
Keyword(s):  
Cross Section ◽  
Tannic Acid ◽  
Elastic Fiber ◽  
The Other ◽  
New Approach ◽  
Tissue Block ◽  
Active Reaction ◽  
The Cross

Previously we reported that tannic acid is a very effective fixative for proteins including polypeptides. Especially, in the cross section of microtubules, thirteen submits in A-tubule and eleven in B-tubule could be observed very clearly. An elastic fiber could be demonstrated very clearly, as an electron opaque, homogeneous fiber. However, tannic acid did not penetrate into the deep portion of the tissue-block. So we tried Catechin. This shows almost the same chemical natures as that of proteins, as tannic acid. Moreover, we thought that catechin should have two active-reaction sites, one is phenol,and the other is catechole. Catechole site should react with osmium, to make Os- black. Phenol-site should react with peroxidase existing perhydroxide.

Crystalline order to a resolution of 4.7 A in the sheath of Methanospirilium hungatii: A cross-beta structure

1984 ◽  
Vol 42 ◽  
pp. 214-215
Author(s):  
Murray Stewart ◽  
T.J. Beveridge ◽  
D. Sprott
Keyword(s):  
Cell Wall ◽  
Single Layer ◽  
Uranyl Acetate ◽  
Optical Diffraction ◽  
Tube Axis ◽  
Basic Subunit ◽  
Beta Structure ◽  
Diffraction Patterns ◽  
Protein Treatment ◽  
General Appearance

The archaebacterium Methanospirillum hungatii has a sheath as part of its cell wall which is composed mainly of protein. Treatment with dithiothreitol or NaOH released the intact sheaths and electron micrographs of this material negatively stained with uranyl acetate showed flattened hollow tubes, about 0.5 μm diameter and several microns long, in which the patterns from the top and bottom were superimposed. Single layers, derived from broken tubes, were also seen and were more simply analysed. Figure 1 shows the general appearance of a single layer. There was a faint axial periodicity at 28.5 A, which was stronger at irregular multiples of 28.5 A (3 and 4 times were most common), and fine striations were also seen at about 3° to the tube axis. Low angle electron diffraction patterns (not shown) and optical diffraction patterns (Fig. 2) from these layers showed a complex meridian (as a result of the irregular nature of the repeat along the tube axis) which showed a clear maximum at 28.5 A, consistent with the basic subunit spacing.

Cytoplasmic Organization in the Receptor Cells of the Crista Ampullaris

1972 ◽  
Vol 30 ◽  
pp. 60-61 ◽  
Author(s):  
Robert F. Dunn
Keyword(s):  
Fine Particles ◽  
Apical Cell ◽  
Apical Region ◽  
Receptor Cells ◽  
Cuticular Plate ◽  
Morphological Organization ◽  
Crista Ampullaris ◽  
Cytoplasmic Organization ◽  
High Degree ◽  
General Appearance

Receptor cells of the cristae in the vestibular labyrinth of the bullfrog, Rana catesbiana, show a high degree of morphological organization. Four specialized regions may be distinguished: the apical region, the supranuclear region, the paranuclear region, and the basilar region.The apical region includes a single kinocilium, approximately 40 stereocilia, and many small microvilli all projecting from the apical cell surface into the lumen of the ampulla. A cuticular plate, located at the base of the stereocilia, contains filamentous attachments of the stereocilia, and has the general appearance of a homogeneous aggregation of fine particles (Fig. 1). An accumulation of mitochondria is located within the cytoplasm basal to the cuticular plate.

Structures Resembling Striated Rootlets in Oocytes

1972 ◽  
Vol 30 ◽  
pp. 124-125
Author(s):  
Valerie V. Ernst
Keyword(s):  
Golgi Complex ◽  
Fibrous Structure ◽  
Oocyte Development ◽  
The Cross

During the earliest stage of oocyte development in the limpet, Acmea scutum, Golgi complexes are small, few and randomly dispersed in the cytoplasm. As growth proceeds, the Golgi complexes increase in size and number and migrate to the periphery of the cell. At this time, fibrous structures resembling striated rootlets occur associated with the Golgi complexes. Only one fibrous structure appears to be associated with a Golgi complex.The fibers are periodically cross banded with an average of 4 dense fibrils and 6 lighter fibrils per period (Fig. 1). The cross fibrils have a center to center spacing of about 7 run which appears to be the same as that of the striated rootlets of the gill cilia in this animal.

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