18 research outputs found
Mecaster duncani Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full textMecaster duncani (Fourtau, 1906) n. comb. (Figs 15N; 17F) Linthia duncani Fourtau, 1906: 162, pl. 3, figs 1-4. Periaster duncani – Abdelhamid & El Qot 2001: 29, fig. 7N. MATERIAL EXAMINED. — 29 specimens from the Turonian (Wata Formation) of Wadi Dakhl, ASUDLE187-215, Wadi Dakhl echinoid horizon 1 (DEH 1) and 18 from the same stage of Wadi Abu Qaada, ASUAQE170-187, Wadi Abu Qaada echinoid horizon 1 (QEH 1). MEASUREMENTS. — See Table 15. DESCRIPTION Test polygonal.Maximum width lies slightly behind the distal ends of anterior paired petals. Apical disc semi-ethmolytic, transverse, centric to slightly eccentric anteriorly.Frontal ambulacrum nonpetaloid, and relatively deep.Paired ambulacra deep, wide, and petaloid. Peristome pentagonal, transverse, and labiates. There are two types of fascioles: a wide band of peripetalous ortho- to parafasciole (sensu Néraudeau et al. 1998) and a fine band of lateroanal parafasciole. R EMARKS Many authors considered that the post-Cenomanian Mecaster Pomel, 1883 species can develop two fascioles (peripetalous and latero-anal) in fine grained sediments (Lambert 1921; Zaghbib-Turki 1989, 1990; Néraudeau 1994; Villier et al. 2004). Accordingly, many species previously referred to Periaster d’Orbigny, 1853 are attributed to Mecaster (bifasciata ecological varieties of the typical Mecaster species). The present species has long, sub-equal, moderately depressed paired petals. The apical disc is semi-ethmolytic (madreporite separates genital plates 1and 4). Fascioles are composed of a wide band of peripetalous ortho- to parafasciole sensu Néraudeau et al. (1998) and a narrow band of latero-anal parafasciole sensu Néraudeau et al. (1998; bifasciata stage). The labrum is triangular and long, and the sternal plates are approximately symmetric (Fig. 17F). These characters refer this species to genus Mecaster.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 607-608, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
FIG. 1 in Turonian-Santonian echinoids from Egypt
No full textFIG. 1. — Location map showing the localities (�) from which the present material was collected in Egypt.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 577, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Mecaster roachensis Mohamed Abdelhamid & Moustafa Azab 2012, n. comb.
No full text<i>Mecaster roachensis</i> (Gauthier, 1900) n. comb. (Fig. 15O) <p> <i>Periaster roachensis</i> Gauthier <i>in</i> Fourtau, 1900: 24, pl. 1, figs 13-15. — Abdelhamid 1997: 156, fig. 7 (9, 10).</p> <p>MATERIAL EXAMINED. — Two well preserved and numerous incomplete specimens from Abu Roash: Turonian (rudist unit), ASUARE152, Abu Roash echinoid horizon 1 (REH 1) and the Coniacian-Santonian (Ostrea and Plicatula unit), ASUARE153, Abu Roash echinoid horizon 4 (REH 4).</p> <p>DESCRIPTION</p> <p>Test size variable (L = 14.5-40.0mm) but mostly has large size. Outline heat-shape (W/L = 0.91-0.95).</p> <p>Anterior margin with a marked sulcus. Adapical surface sloped forwards. Maximum height lies directly behind apical disc (H/L = 0.62-0.70). Posterior surface with oblique to nearly vertical truncation. Adoral surface swollen at the plastron. Sternal plates are approximately equal. Apical disc semi-ethmolytic, centric, and transverse. Frontal ambulacrum nonpetaloid (NIII = 40), deep, wider than the paired petals and conspicuously notching the ambitus until the peristome. Paired ambulacra petaloid, deep, and relatively narrow. Anterior paired petals long (LII = 7.8-13.9 mm, NII = 30- 45). Posterior paired petals shorter (LI/LII = 0.80, NI = 30-45), narrower, and less divergent than the anterior paired petals.</p> <p>REMARKS</p> <p> This species has fairly long, slightly depressed paired petals. The posterior pair is relatively shallower and shorter than the anterior one. The apical disc is semi-ethmolytic (the madreporite separates the genital plates 1 and 4). Fascioles are a narrow band of peripetalous ortho- to parafasciole <i>sensu</i> Néraudeau <i>et al.</i> (1998) and a narrow band of lateroanal parafasciole (bifasciata stage). The labrum is triangular and long. The sternal plates are nearly symmetric. As discussed in the previous species, regards the relation between the two genera <i>Periaster</i>, d’Orbigny, 1853 and <i>Mecaster</i>, the characters of the present species attribute it to the genus <i>Mecaster</i>. <i>Mecaster roachensis</i> n. comb. is distinguished from <i>Mecaster fourneli</i> in having lateroanal parafascioles, maximum width lies at the mid distance between anterior and posterior of test, more centric apical disc, and wider frontal ambulacrum.</p>Published as part of <i>Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3)</i> on page 608, DOI: 10.5252/g2012n3a7, <a href="http://zenodo.org/record/5378120">http://zenodo.org/record/5378120</a>
Rachiosoma rectilineatum
No full textRachiosoma rectilineatum (Péron & Gauthier, 1881) (Fig. 8G) Cyphosoma rectilineatum Péron & Gauthier in Cotteau, Péron & Gauthier, 1881: 104, pl. 7, figs 1-4. Rachiosoma rectilineatum – Geys 1992: 147, pl. 2, figs 8-9. — El Qot 2010: 272, pl. IV, figs 2a, b, 4, 5, text-fig. 5b. MATERIAL EXAMINED. — 13 measured specimens and many non-measured ones from the Coniacian-Santonian (Matulla Formation) of Wadi Dakhl, ASUDLE2-14, Wadi Dakhl echinoid horizon 3 (DEH 3). MEASUREMENTS. — See Table 4. DESCRIPTION Adapical surface convex. Adoral surface feebly depressed around peristome. Ambulacral areas relatively wide, narrowed near apical disc. Poriferous zones uniserial, straight. Major ambulacral plates quadrigeminate, but trigeminate on adoral surface. Interradial extrascrobicular surface narrow. Adradial extrascrobicular surface relatively wide and occupied by very small tubercles lying near adradial suture, beside numerous granules. REMARKS This species is known from the Santonian of Algeria, Egypt and Jordan. Geys (1992) recorded it from the basal part of the Turonian in Wadi Qena, Egypt.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 590-592, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Phymosoma baylei
No full textPhymosoma baylei (Cotteau, 1864) (Figs 5I; 6G; 7A, B) Cyphosoma baylei Cotteau, 1864: 584, pl. 1138, figs8-13; pl. 1139, figs 1-6. Phymosoma baylei – Abdelhamid & El Qot 2001: 13, fig. 4L. MATERIAL EXAMINED. — Two specimens: one from the Turonian (Wata Formation) of Wadi Dakhl, ASUDLE1, Wadi Dakhl echinoid horizon 1 (DEH 1) and one from Wadi Abu Qaada, ASUAQE3, Wadi Abu Qaada echinoid horizon 1 (QEH 1). DESCRIPTION Test diameter attaining 24.5-30.0 mm. Adoral surface flattened. Adapical surface convex (H/D= 0.39-0.43). Poriferous zones biserial and wide adapically. Major ambulacral plates trigeminate near peristome, polygeminate with five pore pairs arranged in arc at the ambitus (Fig. 7A), whereas near apical disc, each major ambulacral plate carries six pore pairs (Fig. 6G). Adradial extrascrobicular surface relatively wide and occupied by secondary tubercles and frequent granules (Fig. 7B). REMARKS The present species (Fig.6G) is distinguished from P. abbatei in having conspicuous and wide biserial poriferous zones in adapical surface, larger ambulacral tubercles in adapical surface, and more ambulacral and interambulacral tubercles per one column (Na = 12 vs 7-10; Ni = 11 vs 7-10). Devriès (1960) indicated that the poriferous zone of P. baylei is uniserial in specimens less than 15 mm diameter and that the biserial arrangement increases with the size of the individuals.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on pages 584-586, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Desoricidaris aegyptica
No full textDesoricidaris aegyptica (Fourtau, 1914) (Fig. 5A) Leiocidaris aegyptica Fourtau, 1914: 4, pl. 1, fig. 2. Desoricidaris aegyptica – Geys 1992: 143. MATERIAL EXAMINED. — Several test fragments from the Coniacian-Santonian of Abu Roash (Ostrea and Plicatula unit), ASUARE1, Abu Roash echinoid horizon 4 (REH 4). DESCRIPTION Ambulacra narrow, flexuous. Pores in each pore pair equal, oval, conjugate. Pore pairs separated by ridges. Interporiferous zone occupied by four horizontal granules, the outer granules slightly larger than the inner. Interambulacra with two rows of well-developed, perforate, non-crenulated primary tubercles. Areoles shallow, nearly round, surrounded by conspicuous scrobicular tubercles. Adradial extrascrobicular surface null. Interradial extrascrobicular surface narrow. REMARKS The relation between the genera Phyllacanthus Brandt, 1835, Leiocidaris Desor, 1855, Rhabdocidaris Desor, 1855 and Desoricidaris Geys, 1992 was discussed by Abdelhamid (1997).Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 580, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Phymosoma beadnelli
No full textPhymosoma beadnelli (Gregory, 1906) (Figs 5J; 7C, D) Cyphosoma beadnelli Gregory, 1906: 221, pl. 10, figs 6-8. Cyphosoma abbatei mutatio beadnelli – Fourtau 1914: 29. Phymosoma beadnelli – Devriès 1960: 133. MATERIAL EXAMINED. — Many deformed tests and numerous test fragments from the Coniacian-Santonian of Abu Roash (Ostrea and Plicatula unit), ASUARE41-43, Abu Roash echinoid horizon 4 (REH 4). DESCRIPTION Test with medium to large size. Ambulacral area wide (Wa/Wi = 0.79). Poriferous zone shows conspicuous biserial arrangement from the ambitus to the apex, wide near the apex where the two poriferous zones constitute 64% of ambulacrum width. At the ambitus and adoral surface, ambulacral primary tubercles are confluent and as large as interambulacral tubercles but decrease in size near the apex. REMARKS The present species is distinguished from P. abbatei in having confluent ambulacral and interambulacral tubercles, conspicuous biserial arrangement of poriferous zones above ambitus (Fig. 7C, D), and wider ambulacra (Wa/Wi = 0.79 vs 0.62-0.72). It is distinguished from P. baylei (Cotteau, 1864) in having wider ambulacra (Wa/Wi = 0.79 vs 0.63- 0.73 in the latter species) and confluent ambulacral and interambulacral tubercles. Fourtau (1921) considered P. beadnelli as a mutation from P. abbatei, but it is believed that the above-mentioned differences between the two forms are sufficient to consider them separate species. Devriès (1960) pointed out that P. beadnelli resembles P. coquandi (Cotteau, 1864) but the latter species is distinguished in having wider extrascrobicular surface, nonconfluent areoles and abundant granules on interambulacra.Published as part of Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3) on page 586, DOI: 10.5252/g2012n3a7, http://zenodo.org/record/537812
Hemiaster barthouxi Lambert 1931
No full text<i>Hemiaster barthouxi</i> Lambert, 1931 (Fig. 15G, H) <p> <i>Hemiaster barthouxi</i> Lambert, 1931: 196, pl. 5, figs18, 19.</p> <p>MATERIAL EXAMINED. — Five specimens from theTuronian of Wadi Abu Qaada (Wata Formation), ASUAQE144-148, Wadi Abu Qaada echinoid horizon 1 (QEH 1).</p> <p>25</p> <p>20</p> <p>15</p> <p>10</p> <p>5</p> <p>5 10 15 20 25 10</p> <p>8</p> <p>6</p> <p>4</p> <p>2</p> <p>0</p> <p>5 10 15 20 25</p> <p>7</p> <p>5</p> <p>3</p> <p>1</p> <p>5 10 15 20 25</p> <p>7</p> <p>5</p> <p>3</p> <p>1</p> <p>5 10 15 20 25 14</p> <p>12</p> <p>10</p> <p>8</p> <p>6</p> <p>4</p> <p>2</p> <p>5 10 15 20 25 40</p> <p>35</p> <p>30</p> <p>25</p> <p>20</p> <p>15</p> <p>10</p> <p>5 10 15 20 25 35</p> <p>30</p> <p>25</p> <p>20</p> <p>15</p> <p>10</p> <p>5 10 15 20 25 35</p> <p>30</p> <p>25</p> <p>20</p> <p>15</p> <p>length 10</p> <p>5 10 15 20 25</p> <p>DESCRIPTION</p> <p> Test length attaining 23.0- 28.1 mm. Outline oval to sub-round, markedly wide at anterior (W/L = 0.91-1.0). Posterior margin straight. Adapical surface high, culminate behind the apical disc (H/L = 0.66-0.76). Adoral surface convex, swollen at the plastron. Posterior surface with oblique truncation. Apical disc centric, semi-ethmolytic. Frontal ambulacrum narrow and deep near apical disc, flush to very shallow at the ambitus. Paired ambulacra petaloid, relatively short and deep. Posterior paired petals shorter and less divergent than the posterior ones (LI/LII = 0.72-0.77, NI = 23-29, NII = 28-39). Fascioles are a narrow band of peripetalous parafasciole (<i>sensu</i> Néraudeau <i>et al.</i> 1998).</p> <p>REMARKS</p> <p> This species is characterized by its globular test with short petals and flush frontal ambulacrum at the ambitus. It is distinguished from <i>H</i>. <i>gauthieri</i> Péron, 1877 from the Turonian and Santonian of France and Spain in having relatively longer and deeper petals.</p>Published as part of <i>Mohamed Abdelhamid, Marouf Abdel-Aty & Moustafa Azab, Mahmoud, 2012, Turonian-Santonian echinoids from Egypt, pp. 575-615 in Geodiversitas 34 (3)</i> on pages 602-604, DOI: 10.5252/g2012n3a7, <a href="http://zenodo.org/record/5378120">http://zenodo.org/record/5378120</a>
Échinoïdes de la séquence Turonien-Santonien d’Égypte
No full textTrente espèces d’échinoïdes (18 réguliers et 12 irréguliers) et une espèce indéterminée se répartissant dans 14 genres, et provenant des séquences Turonien-Santonien d’Abu Roash, de Wadi Dakhl et de Wadi Abu Qaada, Égypte, sont étudiées (14 espèces du Turonien, deux du Turonien-Santonien et 14 du Coniacien-Santonien). Deux nouvelles espèces sont décrites : Thylechinus (Thylechinus) sinaiensis n. sp. du Turonien de Wadi Abu Qaada et Toxaster dakhlensis n. sp. du Turonien de Wadi Dakhl. Orthopsis ovata (Coquand, 1862), déjà présent à d’autres endroits de la région de Thétis, est signalé pour la première fois en Égypte. Une sous-espèce est élevée au rang d’espèce : Coenholectypus roachensis (Fourtau, 1914) n. stat. L’attribution générique de trois espèces est modifiée : Echinobrissus humei Fourtau, 1906 devient Petalobrissus humei (Fourtau, 1906) n. comb.; Periaster duncani (Fourtau, 1906) et Periaster roachensis Gauthier, 1900 sont transférés dans le genre Mecaster Pomel, 1883. Les changements ontogéniques de Mecaster turonensis (Fourtau, 1921) sont décrits. La biostratigraphie et la paléobiogéographie de la faune sont discutées.Thirty echinoid species (18 regular and 12 irregular) and an undetermined species belonging to 14 genera are studied from the Turonian-Santonian sequence (14 species from Turonian, two species from Turonian-Santonian and 14 species from Coniacian-Santonian) of Abu Roash, Wadi Dakhl and Wadi Abu Qaada, Egypt. Two new species are established: Thylechinus (Thylechinus) sinaiensis n. sp. from the Turonian of Wadi Abu Qaada and Toxaster dakhlensis n. sp. from the Turonian of Wadi Dakhl. Orthopsis ovata (Coquand, 1862), which is known in other parts of the Tethyan region, is reported for the first time from Egypt. The rank of one subspecies is raised to species level: Coenholectypus roachensis (Fourtau, 1914) n. stat. The generic name of three species is changed: Echinobrissus humei Fourtau, 1906 is changed to Petalobrissus humei (Fourtau, 1906) n. comb.; Periaster duncani (Fourtau, 1906) and Periaster roachensis Gauthier, 1900 are transfered to the genus Mecaster Pomel, 1883. The ontogenetic changes of Mecaster turonensis (Fourtau, 1921) are described. The biostratigraphy and paleobiogeography of the fauna are discussed.</p
Baswilic Acid Disable Signal Transduction of IL-6/STAT-3 in Ehrlich Tumor Bearing Irradiated Mice
No full textBackground. Baswilic acid (BA) was claimed for its capability of triggering apoptosis as well as inhibiting angiogenesis in tumor tissue.
Purpose. In the present study, the effect of BA on the IL-6/STAT-3 signal was investigated in irradiated mice bearing ehrlich ascites carcinoma solid tumor (E).
Methods. 25 mg/kg/day (i.p) of BA were administrated to mice bearing E and exposed to 4Gy gamma radiation.
Results. Data analysis revealed a specific impact of BA on the IL-6R mRNA and survivin mRNA in E and irradiated E mice. Also, significant improvements were observed in the protein expression of JAK-1, P- JAK-1, STAT-3, P- STAT-3 and Caspase-3 as well as VEGF and IL-6 levels.
Conclusion. It could be suggest that, BA interfered with IL-6/STAT-3 signal transduction that prevent the activation of Caspase-3 and subsequently trigger the process of apoptosis. However, the alternative angiogenesis pathway, include the over expression of VEGF level, which depend on IL-6/STAT-3 signalling was inhibited by the action of BA. Here it is possible to recommend that cancer therapeutic strategies have to include BA administration.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author
