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Disclaimer: PC-Tax is the product of ongoing research and we continuously update the taxonomy and data.
PC-Tax is the Pontocaspian taxonomic platform that targets so-called Pontocaspian biota. These biota are a unique flora and fauna that evolved in mostly brackish lake systems in and around the Caspian Sea, Black Sea and adjacent lakes in the past few million years.

PC-Tax is developed as part of the EU-funded Innovative Training Network “PRIDE” (Drivers of Pontocaspian Biodiversity Rise and Demise). Between 2015 and 2018 we will include different lake biota, fossil and recent that characterize the Pontocaspian biota in PC-Tax. Initially we will focus on a number of groups including bivalves, gastropods, ostracods, and dinoflagellates.
The aim of PC-Tax is to provide standardized taxonomic information to be used by researchers working with Pontocaspian biodiversity. We aim to attract users beyond the PRIDE program. 
PC-Tax is maintained by Aleksandre Gogaladze & Niels Raes (Naturalis Biodiversity Center, Leiden, The Netherlands), so if you have any question please mail us at aleksandre(dot)gogaladze(at)naturalis(dot)nl
 

Welcome! This website provides an interactive, digitised version of the Alkaline Rocks and Carbonatites of the World volumes, by Dr. Alan R. Woolley. Information can be accessed by using the map feature, search or occurence information.
 
The definition of alkaline rocks adopted is generally that of Sørensen (1974, p. 7): that they "are characterized by the presence of feldspathoids and/or alkali pyroxenes and amphiboles". The rocks included are, therefore, the nepheline syenites (phonolites) and ijolites (nephelinites), basanites and feldspathoid-bearing gabbroic rocks; peralkaline (i.e. containing alkali pyroxene and/or amphibole) syenite, quartz syenite and granite, together with peralkaline trachyte, comendite and pantellerite.  Fenites are also included because of their intimate association with alkaline rocks and carbonatites, as are certain ultramafic and melilite-bearing rocks, including the alnoites and melilitolites. Analcime is treated as a feldspathoid for purposes of the above definition. In the case of alkaline rocks volcanic rocks, when plotted on the TAS diagram, rocks are included as alkaline if they plot in the alkaline fields.

CIGESMED: Coralligenous based Indicators to evaluate and monitor the "Good Environmental Status" of the MEDiterranean coastal waters
These results were obtained within the international Seas-Era ERA-Net Research Project CIGESMED: “Coralligenous based indicators to evaluate and monitor the "good environmental status" of the Mediterranean coastal waters”. The program is jointly funded by the French National funding agency ANR (contract number 12-SEAS-0001-01, 12-SEAS-0001-02, 12-SEAS-0001-03), the Greek GSRT (contract number 12SEAS-12-C2) and Tübitak (contract number 112Y393)

多年生草本,较少为一年生;多数具根状茎少有兼具块茎。大多数具有三棱形的秆。叶基生和秆生,一般具闭合的叶鞘和狭长的叶片,或有时仅有鞘而无叶片。花序多种多样,有穗状花序、总状花序、圆锥花序、头状花序或长侧枝聚伞花序;小穗单生,簇生或排列成穗状或头状,具2至多数花,或退化至仅具1花;花两性或单性,雌雄同株,少有雌雄异株,着生于鳞片腋间,鳞片复瓦状螺旋排列或二列,无花被或花被退化成下位鳞片或下位刚毛,有时雌花为先出叶所形成的果囊所包裹;雄蕊3个,少有2—1个,花丝线形,花药底着;子房一室,具一个胚珠,花柱单一,柱头2-3个。果实为小坚果,三棱形、双凸状、平凸状或球形。
 
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