+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

First report of the mitrate Peltocystis cornuta Thoral (Echinodermata, Stylophora) in the Lower Ordovician of central Anti-Atlas (Morocco)

, : First report of the mitrate Peltocystis cornuta Thoral (Echinodermata, Stylophora) in the Lower Ordovician of central Anti-Atlas (Morocco). Annales de Paleontologie 93(3): 183-198

The mitrate Peltocystis cornuta is one the best known and most abundant stylophoran echinoderms in the Lower Ordovician (upper Tremadoc - lower Arenig) of Montagne Noire (southern France). It is here documented outside this region for the first time, in coeval deposits of central Anti-Atlas (Morocco). This report confirms the strong faunal affinities between Montague Noire and Moroccan assemblages in the Ordovician. Twenty-eight individuals of P. cornuta are described from two distinct localities of the Zagora region. Their overall morphology is very comparable to that of Montague Noire specimens. However, the Moroccan Peltocystis differ from the French ones in their smaller mean size, and in the absence of abnormalities in thecal plating (situs inversus is frequent in the Montague Noire specimens). These differences are possibly related to the distinct palaeoenvironmental conditions, in which the Moroccan and French assemblages were living: in Montague Noire, P. cornuta was found in deeper, quieter (less stressful) deposits than in the Anti-Atlas. Finally, the periproct is clearly identified for the first time in Peltocystis, in a more anterior position than previously thought.


DOI: 10.1016/j.annpal.2007.06.003

Other references

Ohno, R.; Kato, Y.; Nagura, E.; Murase, T.; Okumura, M.; Yamada, H.; Ogura, M.; Minami, S.; Suzuki, H.; Morishima, Y., 1986: Behenoyl cytosine arabinoside, daunorubicin, 6-mercaptopurine, and prednisolone combination therapy for acute myelogenous leukemia in adults and prognostic factors related to remission duration and survival length. Fifty-one consecutive previously untreated adult patients with acute myelogenous leukemia (AML) were treated with BHAC-DMP (N4-behenoyl-I-beta-D-arabinofuranosyl-cytosine, daunorubicin, 6-mercaptopurine, and prednisolone) therapy. Forty-two patien...

Mukherjee, T.; Barad, D.; Turk, R.; Freeman, R., 1996: A randomized, placebo-controlled study on the effect of cyclic intermittent etidronate therapy on the bone mineral density changes associated with six months of gonadotropin-releasing hormone agonist treatment. OBJECTIVE: Our purpose was to determine whether intermittent cyclic etidronate therapy blocks the decline in bone density associated with gonadotropin-releasing hormone agonist therapy. STUDY DESIGN: Thirty-one premenopausal subjects who needed tr...

Herren, T.; Achermann, E.; Hegi, T.; Reber, A.; Stäubli, M., 2017: Carbon dioxide narcosis due to inappropriate oxygen delivery: a case report. Oxygen delivery to patients with chronic obstructive pulmonary disease may be challenging because of their potential hypoxic ventilatory drive. However, some oxygen delivery systems such as non-rebreathing face masks with an oxygen reservoir bag r...

Gardner, S.N.; Thomas, M.B., 2002: Costs and benefits of fighting infection in locusts. Locusts and grasshoppers are truly cosmopolitan pests. In an effort to reduce the environmental side effects of current chemical control practices, several programmes around the world are developing biopesticides, based on fungal entomopathogens,...

Colauto,N.B.; Aizono,P.M.; Carvalho,; Paccola-Meirelles,L.D.; Linde,G.A., 2008: Temperature and pH conditions for mycelial growth of Agaricus brasiliensis on axenic cultivation. The optimum temperature and initial pH for the growth of <i>A. brasiliensis</i> mycelia on malt extract agar medium were studied. The initial pH values for mycelial growth were adjusted to 3.0, 4.0, 5.0 and 5.5 with HCl; 6.0, 7.0 and 8...

Cheng-Mayer, C.; Tasca, S.; Ho, S-hong., 2009: Coreceptor switch in infection of nonhuman primates. The human immunodeficiency virus (HIV) enters target cells via interaction of the viral glycoprotein with the cellular receptor CD4 and two principal coreceptors, CCR5 (R5 viruses) and CXCR4 (X4 viruses). Most HIV-1 transmissions result in a predo...

Juiz J.M.; Helfert R.H.; Wenthold R.J.; Altschuler R.A., 1990: Increased levels on glutamate immunoreactivity in the auditory nerve endings of the dorsal cochlear nucleus. Society for Neuroscience Abstracts 16(2): 1189

Novikov, Y.V.; Tsyplakova, G.V.; Semenova, O.G.; Trukhina, G.M., 1998: Hygienic assessment of alkaline coagulants and zeolites while preparing drinking water. Gigiena i Sanitariya 0(1): 37-39, Jan -Feb

Drenth, J.J., 2000: The story of the spotted hyena and the hermaphrodite: biological order and enigma. The complex problem of genital masculinization is illustrated in this article from the perspectives of comparative zoology, and pediatric plastic surgery on intersex children. In addition, criticism and recommendations coming from patient internet...

Rogers, C.B.; Thevan, I., 1986: Identification of mollic acid a- L-arabinoside, a 1a-hydroxycycloartenoid from Combretum molle leaves. Phytochemistry 25(7 ): 59-61