. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS 113. Fig. 22 Camera lucida drawing of plating in Stegaster bouillei (Cotteau, in de Bouille, 1873) from the late Maastrichtian of Bidart (Pyrenees- Atlantiques, France); BMUW 94988, oral surface (interambulacra shaded). Scale bar = 5 mm. sulcus sharp and well developed, forming obvious narrow groove on oral surface. Ambulacral plates low and relatively wide, compared to S. alius, and with elongate pore-pairs en chevron. Larger primary tubercles present close to the apex and along the posterior ri
. Bulletin of the Natural Histort Museum. Geology series. LATE CRETACEOUS-EARLY TERTIARY ECHINOIDS 113. Fig. 22 Camera lucida drawing of plating in Stegaster bouillei (Cotteau, in de Bouille, 1873) from the late Maastrichtian of Bidart (Pyrenees- Atlantiques, France); BMUW 94988, oral surface (interambulacra shaded). Scale bar = 5 mm. sulcus sharp and well developed, forming obvious narrow groove on oral surface. Ambulacral plates low and relatively wide, compared to S. alius, and with elongate pore-pairs en chevron. Larger primary tubercles present close to the apex and along the posterior ridge between the apex and periproct. Larger tubercles also developed just above the ambitus around the posterior part of the test. Periproct supra-ambital, but test depressed below the periproct so that the periproct opening is just visible in oral view. Occurrence. Lower Maastrichtian (black shale facies), Sarasate, Navarra; upper Upper Maastrichtian, Bidart, Pyrenees-Atlantiques, France. The species was first described from the Maastrichtian of the French Pyrenees between Gan and Rebenac, and is also known from the Province of Alicante, Spain and from Turkey, Crimean peninsula. Republic of Georgia, and the North Caucasus. Material studied. BMNH EE4375, EE4568, EE4566, EE6066, MGB 37286-87, 37300. Remarks. Easily separated from 5. alius by its characteristic elongate shape and vaulted upper surface with the tallest point anterior. S. cotteaui differs in having a disjunct plastron and a more ovate outline. Stegaster altus Seunes, 1889 1889 Stegaster altus Seunes: 815, pi. 26, fig. 1. 1891 Stegaster chalmasi Seunes: 23, pi. 1, fig. 1. 1892 Stegaster chalmasi Seunes; Nickles: 110. 1892 Stegaster altus Seunes; Nickles: 111. 1995 Stegaster novoi Lambert; Gallemi et ai: 269, table 1. Diagnosis. Test up to 50 mm in length. Like S. boullei, but test almost as wide as long and very tall; height more than 70% of test length. Ambulacral plates much taller than in S. bouillei. Occurrence.
Size: 1551px × 1611px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bhlconsortium, bookcentury1900, bookcollectionbiodiversity, bookl
