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[Famille des CRANIOPSIDAE] Heliomedusa orienta

 
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MessagePosté le: Jeu 1 Aoû - 06:11 (2013)    Sujet du message: [Famille des CRANIOPSIDAE] Heliomedusa orienta Répondre en citant

Hello,

After Diandongia pista RONG 1974 Family BOTSFORDIIDAE and Lingulella chengjiangensis J. Yugan & other 1993 Family OBOLIDAE I present now with Heliomedusa orienta SUN & HOU 1987 Family CRANIOPSIDAE the third inarticulate brachiopod from the famous Lower Cambrian Chengjiang soft-tissue fossils from China!
Chengjiang in southern China is sort of a window into the time of the Middle of Lower Cambrian .

Here is an explanation of how it has come to the strange name:

Intro: Heliomedusa orienta was first identified as a jellyfish, was later described as a craniopsoid brachiopod. A number of sample  of this brachiopod, measuring 3.1 -  22.0 mm long, from two new sites of the Lower Cambrian Yuanshan Formation was examined.            
The sample includes several with exceptional preservation of nonmineralized skeletons that reveal previously unknown           
features and fill a gap in our knowledge of the detailed anatomy of fossil discinids It is here reinterpreted as a discinid brachiopod on the basis of its many distinctive, discinid anatomical features, such as a longitudinally oval pedicle foramen in     
the anterior region  such as a longitudinally oval pedicle foramen in the anterior region of the posterior sector of the ventral valve; inferred, short, but large pedicle descending ventrally from the ventral valve; inferred, paired rectus muscles in the large pedicle canal; elongate scars of paired anterior adductors; and a median septum connected to a U-shaped ridge on the ventral interior.  

Here are the taxonomy, locality data and pitures:
        
Heliomedusa orienta SUN & HOU 1987 type species of Genus ?Heliomedusa SUN & HOU 1987, Family CRANIOPSIDAE Williams 1963, Superfamily CRANIOPSOIDEA Williams 1963, Order CRANIOPSIDA Gorjansky & Popov 1985 from Middle of Lower Cambrian, Heilinpu Formation , Yu'anshan Member, Maotianshan Chengjiang Shales, found eastern Yunnan province of southern China in Maotianshan near the town Chengjian :



Heliomedusa orienta SUN & HOU 1987 type species
?Heliomedusa SUN & HOU 1987     
Family CRANIOPSIDAE Williams 1963  
Superfamily CRANIOPSOIDEA Williams 1963  
Order CRANIOPSIDA Gorjansky & Popov 1985
Middle of Lower Cambrian ( 525 Mio year )
Heilinpu Formation
Yu'anshan Member
Maotianshan Chengjiang Shales
found eastern Yunnan province of southern China in Maotianshan near the town Chengjian



Detlef
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