{"id":7590,"date":"2026-02-05T15:34:50","date_gmt":"2026-02-05T14:34:50","guid":{"rendered":"https:\/\/fossiland.com\/?post_type=product&p=7590"},"modified":"2026-02-06T16:25:10","modified_gmt":"2026-02-06T15:25:10","slug":"regulaecystis-b0009","status":"publish","type":"product","link":"https:\/\/fossiland.com\/en\/shop\/bundenbach\/regulaecystis-b0009\/","title":{"rendered":"Bundenbach Regulaecystis pleurocystoides"},"content":{"rendered":"

Bundenbach Regulaecystis pleurocystoides<\/strong><\/span><\/p>\n

4.0 cm (fossil), 11×12.5 cm (matrix)
\nBundenbach; Obereschenbach pit<\/span><\/p>\n

Very rare cystoid on unbroken plate with excellent details.<\/span><\/p>\n

 <\/p>\n

Regulaecystis pleurocystoides – The armored jewel from the Hunsr\u00fcck slate<\/span><\/h2>\n

Exclusivity in pouch form: one of the rarest cystoids in the world.<\/span><\/h3>\n

If there is one fossil that epitomizes the uniqueness of the Bundenbach slate, then it is Regulaecystis pleurocystoides<\/em>. This species is not only extremely rare, it is also an endemic – it is found exclusively in the famous slate quarries of the Hunsr\u00fcck. A fossil for collectors who want to combine the local with the spectacular. <\/span><\/p>\n

 <\/p>\n

The distinctive features – what characterizes Regulaecystis pleurocystoides:<\/span><\/h3>\n
    \n
  • The “pouch-shaped” carapace:<\/strong> The theca (the body) impresses with its striking pouch shape. It is composed of numerous polygonal plates that look like a precise mosaic. This structure gives the fossil a wonderful geometric texture and an almost technical aesthetic. <\/span><\/li>\n
  • The bordered anal area:<\/strong> a detail for the connoisseur’s eye: The anal field is enclosed by clear border strips. This “framing” provides a clear outline within the plate armor and is a real highlight on well-preserved pieces. <\/span><\/li>\n
  • The two powerful “antennae”:<\/strong> The two powerful arms (brachiola) are unique in appearance. They protrude from the body like antennae and give the otherwise compact fossil a fascinating directional dynamic. <\/span><\/li>\n
  • A stalk with a history:<\/strong> The stalk of Regulaecystis<\/em> is surprisingly long. Particularly characteristic of finds from Bundenbach is an often-observed kink in the stalk – a sign of the original embedding in the mud, which gives the fossil an additional, dramatic note. <\/span><\/li>\n<\/ul>\n

    A masterpiece of primeval armor<\/span><\/h3>\n

    Cystoids such as Regulaecystis<\/em> are the architects among echinoderms. The way in which the polygonal plates interlock to provide protection for the body is a fascinating testimony to evolution. As these animals are only preserved in this level of detail in very few places worldwide, every piece is a scientific treasure. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

    Regulaecystis pleurocystoides – rare cystoid from the Devonian of Bundenbach (Hunsr\u00fcck slate), on unbroken slab, detailed specimen.<\/p>\n","protected":false},"featured_media":7591,"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":[145,90,148],"product_tag":[173,156,174,211,232],"class_list":{"0":"post-7590","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bundenbach","7":"product_cat-crinoids","8":"product_cat-fossils","9":"product_tag-bundenbach","10":"product_tag-cystoid","11":"product_tag-devon","12":"product_tag-hunsrueck-slate-2","13":"product_tag-regulaecystis","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\/7590","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=7590"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/media\/7591"}],"wp:attachment":[{"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/media?parent=7590"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_brand?post=7590"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_cat?post=7590"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/fossiland.com\/en\/wp-json\/wp\/v2\/product_tag?post=7590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}