{"id":7593,"date":"2026-02-05T15:54:24","date_gmt":"2026-02-05T14:54:24","guid":{"rendered":"https:\/\/fossiland.com\/?post_type=product&p=7593"},"modified":"2026-02-06T16:23:47","modified_gmt":"2026-02-06T15:23:47","slug":"orbiculoidea-b0010","status":"publish","type":"product","link":"https:\/\/fossiland.com\/en\/shop\/bundenbach\/orbiculoidea-b0010\/","title":{"rendered":"Bundenbach Orbiculoidea mediorhenana"},"content":{"rendered":"

Bundenbach Orbiculoidea mediorhenana<\/strong><\/span><\/p>\n

8.5 cm (fossil), 19×24 cm (matrix)
\nBundenbach; Obereschenbach pit<\/span><\/p>\n

Very large and rare brachiopod on unbroken slab with excellent details.<\/span><\/p>\n

 <\/p>\n

Orbiculoidea mediorhenana – The golden discus of the Hunsr\u00fcck slate<\/span><\/h2>\n

A rare, inarticulate brachiopod.<\/span><\/h3>\n

In the world of fossils, it is often the simple forms that exert the greatest fascination. Orbiculoidea mediorhenana<\/em> is the best example of this. While other arthropods relied on ribbed, heavy shells, this exotic chose a design that could still be considered modern today: a perfectly circular, flat-conical shell that looks like a sunken shield in the black slate. <\/span><\/p>\n

 <\/p>\n

The distinctive features – what makes Orbiculoidea so special:<\/span><\/h3>\n
    \n
  • The perfect circular shape:<\/strong> the name says it all (lat. orbiculus<\/em> for small circle). The bowl is almost exactly circular and has a very fine, concentric growth striation. In the play of light in the display case, this structure is reminiscent of the grooves on an antique record or a fine piece of jewelry. <\/span><\/li>\n
  • Inarticulate elegance:<\/strong> In contrast to most brachiopods, Orbiculoidea<\/em> does not have a mechanical lock (inarticulate). The shell halves were held together purely muscularly. This gives the fossil a smooth, undisturbed contour, which is considered particularly aesthetic in paleontology. <\/span><\/li>\n
  • The “apex”:<\/strong> The shell is slightly curved in a cone shape, with the apex often being slightly off-center. This gives the fossil an exciting spatial dynamic. <\/span><\/li>\n
  • Pyritization in perfection:<\/strong> As the shells of Orbiculoidea<\/em> originally consisted of an organic-phosphatic substance, they were often pyritized particularly brilliantly in the Hunsr\u00fcck slate. A well-preserved piece shines like a flat taler of real gold on the dark rock. <\/span><\/li>\n<\/ul>\n

    A survivor of the earth’s history from Bundenbach<\/span><\/h3>\n

    The genus Orbiculoidea<\/em> is a fascinating example of evolutionary consistency. This construction plan was so successful that it remained almost unchanged for hundreds of millions of years. A specimen from the Rhenish Devonian such as O. mediorhenana<\/em> documents this success in a level of detail that is unparalleled worldwide. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

    Orbiculoidea mediorhenana – rare, large brachiopod from the Devonian of Bundenbach (Hunsr\u00fcck slate), on unbroken slab, detailed specimen.<\/p>\n","protected":false},"featured_media":7594,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}}},"product_brand":[],"product_cat":[145,148,152],"product_tag":[234,173,174,211,233],"class_list":{"0":"post-7593","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bundenbach","7":"product_cat-fossils","8":"product_cat-others","9":"product_tag-brachiopod","10":"product_tag-bundenbach","11":"product_tag-devon","12":"product_tag-hunsrueck-slate-2","13":"product_tag-orbiculoidea","14":"product_shipping_class-s-2kg-m","15":"desktop-align-left","16":"tablet-align-left","17":"mobile-align-left","19":"first","20":"instock","21":"shipping-taxable","22":"purchasable","23":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product\/7593","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/comments?post=7593"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/media\/7594"}],"wp:attachment":[{"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/media?parent=7593"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_brand?post=7593"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_cat?post=7593"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_tag?post=7593"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}