Find research datasets worth reusing

Fig. 1 in Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

Fig. 1. Trilobite referred to Symphysurus ebbestadi Gutiérrez-Marco, Rábano, and García-Bellido, 2018, from the early Ordovician of Morocco (Tigzigzaouine area), in dorsal views, under standard lighting. A. MGL 102127. B. MGL 102128. C. MGL 102129. D. MGL 102130; D2 close up of thorax axial rings in D1, showing the clear terrace ridges. E. MGL 102131. F. MGL 102132. G. MGL 102133. H. MGL 102134. I. MGL 102135. Scale bars 5 mm.

Fig. 4 in Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

Fig. 4. Graphs showing means (points) and ranges of exoskeleton thickness for cephala (A) and thoraces (B) of the thin sectioned trilobites Symphysurus ebbestadi.

Fig. 3 in Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

Fig. 3. Thin sections showing the cuticular structure of trilobites Symphysurus ebbestadi Gutiérrez-Marco, Rábano and García-Bellido 2018, from the early Ordovician of Tigzigzaouine area, Morocco. A. MGL 102127, the putative moult. B. MGL 102130, a fully-hardened individual. C. MGL 102133, individual with medium levels of wrinkling. D. MGL 102134, the most wrinkled individual. A1–D1, anterodorsal sections through the cephalon (except C1, transverse section); A2–D2, anterodorsal sections through the thorax. Scale bars 1 mm.

Fig. 2 in Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco

Fig. 2. Wrinkled specimens of trilobite Symphysurus ebbestadi Gutiérrez-Marco, Rábano, and García-Bellido 2018, from the early Ordovician of Tigzigzaouine area, Morocco, photographed under low-angle incident lighting, in order to emphasise the three-dimensional surface texture of their exoskeletons. Specimens are organised in relative order of exoskeleton hardening, from that with the most wrinkled and soft exoskeleton (A) to the least wrinkled (D) before being fully hardened. A. MGL 102132. B. MGL 102134. C. MGL 102128. D. MGL 102133. Scale bars 5 mm.

Fig. 3 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 3. Schematic drawing of constriction and rejuvenescence phenomena showing their axial and lateral types.

Fig. 7 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 7. Successive transversal sections showing development of lonsdaleoid dissepiments in two corallites of rugose coral Catactotoechus instabilis Berkowski, 2008, Hamar Laghdad (Morocco), Emsian. A. Specimen UAM Tc/B HD3/200; A1, juvenile stage of growth showing interaction with auloporoid coral; note dissepiment on this side; A2, next stage showing one row of lonsdaleoid dissepiment−extension phase of growth; A3, mature stage of growth showing increase in development of dissepiments in constriction phase of growth; note that diameter of central lumen (aulos) is narrowed. B. Specimen UAM Tc/B HD3/201; B1, constriction phase of growth showing irregular lonsdaleoid dissepiments narrowing septal area; note invaginations of dissepiment in places where septal crests are formed; B2, extension phase of growth showing decrease of lonsdaleoid dissepimentarium and expansion of septal area.

Fig. 6 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 6. Schematic drawing showing successive stages of formation of lonsdaleoid dissepiments. A–D. Smaller dissepiment created between septal pockets. E–H. Larger dissepiment created in place with septal pocket, disrupting septal growth. Note hydrostatic pressure (HP) between basal ectoderm and skeletal structures is here responsible for the pushing up the ectoderm and shaping the dissepiment. Morphological nomenclature refers to all figures (A–H).

Fig. 5 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 5. Well preserved calices of the rugose coral Catactotoechus instabilis Berkowski, 2008, Hamar Laghdad (Morocco), Emsian. A. Specimen UAM Tc/B HD3/217 showing inner calicular structures of extending calice after rejuvenescence; note well developed septa of both orders. B. Specimen UAM Tc/B HD3/212 showing increase of large lonsdaleoid dissepiments formation and simultaneous constriction and shifting of the septal apparatus; note large dissepiment covering previously formed septa. C. Specimen UAM Tc/B HD3/211 showing strong and abrupt constriction of the corallite; note that the wall of rejuvenated part of the corallite is surrounded by a new wall and dissepiments outside it are not fully developed.

Fig. 2 in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 2. External characters of the corallites of rugose coral Catactotoechus instabilis Berkowski, 2008, Hamar Laghdad (Morocco), Emsian. A. Specimen UAM Tc/B HD3/232 showing attachment to auloporid tabulate coral (below). B. Specimen UAM Tc/B {?}3/242 showing attachment to fragment of the crinoid stem. C. Specimen UAM Tc/B HD3/217 showing two corallites attached to each other, note expansion phase of growth after rejuvenescence in calicular part (above). D. Specimen UAM Tc/B HD3/238 showing weak constriction phase, note lack of attachment structures. E. Specimen UAM Tc/B HD3/237 showing successive constrictions and expansions during growth as well as deflection of growth direction in the juvenile stage; note lack of attachment structures. F. Specimen UAM Tc/B HD3/233 showing attached juvenile specimen on external wall near calice causing deflection of growth of calicular part of the corallite, note well developed attachment structure (talon). G. Specimen UAM Tc/B HD3/214 showing rejuvenescence and deflection of growth caused by settlement and growth of 3 juvenile specimens on the left part of calicular rim (competition).

Fig. 1. A in Life strategies and function of dissepiments in rugose coral Catactotoechus instabilis from the Lower Devonian of Morocco

Fig. 1. A. Simplified geologic map of northeastern Anti−Atlas, Devonian rocks and Hamar Laghdad are indicated. B. Outcrop marked by star in circle on southeastern slope of the mound 3 (view from the east). Separated lithologic units marked as roman numbers in squares: I, Saheb el Rhassel Group (Kess−Kess Formation); II, Amerboh Group (marly nodular limestone); III, Amerboh Group (marly shale with marly limestone intercalations); IV, Bou Tchrafine Group. C. Detailed geological map of Hamar Laghdad with distribution of particular types of Devonian rocks. Star in circle indicates outcrop, where studied corals were collected. Drawings A and C courtesy of Bełka (1998 and unpublished)—updated here.

opencc-by-4.0Sep 2012View details →

Fig. 2 in Evidence of a New Carcharodontosaurid from the Upper Cretaceous of Morocco

Fig. 2. Carcharodontosaurid from the Cenomanian "Kem Kem beds" of Morocco, drawing of the left frontal (MPM 2594), in dorsal (A), ventral (B), lateral (C), anterior (D), medial (E), and posterior (F) views. Grey areas indicate weathered or damaged surfaces.

opencc-by-4.0Sep 2012View details →

Fig. 1 in Evidence of a New Carcharodontosaurid from the Upper Cretaceous of Morocco

Fig. 1. Carcharodontosaurid from the Cenomanian "Kem Kem beds" of Morocco, left frontal (MPM 2594), in dorsal (A), ventral (B), lateral (C), anterior (D), medial (E), and posterior (F) views.

Fig. 6 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny

Fig. 6. Reconstruction of the phylogeny of the species of Tiaracrinus, based on their morphology and stratigraphic occurrences. Devonian timescale after Kaufmann (2006). All ranges of species lack precision and are thus indicated by open boxes.

Fig. 4 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny

Fig. 4. PCA of some published (Le Menn 1190; Hauser 2008) and the two newly described specimens of Tiaracrinus (see Table 1). See Methods for definition of the parameters. A. Plot of principal components 1 and 2; note, how the new species separates well from the previously known ones. B. Plot of principal components 1 and 3. C. Plot of principal components 2 and 3; again, the new species is morphologically separated from the others. Open circles mark the values of the new species T. jeanlemenni sp. nov., solid squares mark all other species.

Fig. 2 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny

Fig. 2. Zophocrinid crinoid Tiaracrinus jeanlemenni sp. nov., probably late Polygnathus patulus Conodont Biozone, late Anarcestes lateseptatus Ammonoid Biozone, latest Emsian, Early Devonian, eastern Anti-Atlas Morocco. A. PIMUZ 29739, holotype, "Red cliff" at Hamar Laghdad, Tafilalt. Lateral views (A1, A2), showing the radial channel and the rib-fields; note the ornamentation in the channel near the oral surface in A2. Aboral view (A3), note the small cross section of the trimeral basals and the low rim around it. Oral view (A4), note the ornamentation in the channel near the oral surface. Detail of A3 (A5), note the epispires and the uniform thickness of the ribs. On the top right, the subtle striation is faintly visible between the ribs. Oblique view of the aboral side (A6), showing the epispires. Due to weathering, the ribs obtained a tuberculate ornament (A7). B. PIMUZ 29741, paratype, Jebel Oufatene, Maïder. Aboral view (B1), the rib-fields are less vaulted and the cross section of the calyx less quadrate than in the holotype; the fossil on the top left is a spiriferid. Lateral views (B2, B3), showing the narrow ribs and the smooth surface of the radial channels; in the lateral aspect it looks like the radial channel is tapering towards the oral side of the cup.

Fig. 1 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny

Fig. 1. Geological map (modified from Klug 2002) of the eastern Anti-Atlas showing the two localities that yielded Tiaracrinus.

Fig. 5 in A new species of Tiaracrinus from the latest Emsian of Morocco and its phylogeny

Fig. 5. Cluster analysis (Euclidean, paired group) of some published specimens and the two newly described specimens (see Table 1). The cluster on the right including Tiaracrinus quadrifrons and Tiaracrinus tetraedra is supported by the bootstrap (at 500 replicates; 59%with past); the Tiaracrinus oehlerti and Tiaracrinus moravicus-group (59 and 64%) and the Tiaracrinus jeanlemenni and Tiaracrinus rarus-group (62 and 72%) are also reasonably well supported. See also the methods chapter for definition of the parameters.

opencc-by-4.0Mar 2009View details →

Fig. 4 in Red Devonian trilobites with green eyes from Morocco and the silicification of the trilobite exoskeleton

Fig. 4. Map of Hamar Laghdad showing the mud−mounds, the distribution of the red facies, the position of the red cliff, erosional remnants of the Cretaceous transgression conglomerate and the distribution of outcrops of Middle Devonian sediments (map based on satellite images, the topographic map sheet "Erfoud, feuille NH−30−XX−2, Carte du Maroc 1/100000", and Berkowski 2006: fig. 1).

opencc-by-4.0Mar 2009View details →

Fig. 3 in Red Devonian trilobites with green eyes from Morocco and the silicification of the trilobite exoskeleton

Fig. 3. SEM−SE image of cephalon PIMUZ 27076 and results of the element analyses ("EDX−spektrum X"). A. SEM−SE image of the eye and result of the element analysis of a lense ("EDX−spektrum 1"). Note the absence of iron and silica. B. SEM−SE image of the glabella and result of the element analysis ("EDX−spektrum 9"). Iron and silica are present. C. Analysis performed in the intralensar area ("EDX−spektrum 2") of the glabella(see A). Iron and silica are present.