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41 results for “Trilobita”
FIG. 6 in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 6. — Type specimens of Asaphellus catamarcensis Kobayashi, 1935 (USNM 94136), Angosto de Pascha, Pascha-Incamayo area: A, lectotype in dorsal view (USNM 94136D); B, C, pygidium in dorsal view (USNM 94136C); D, free cheek in dorsal view (USNM 94136B). Scale bars: A, D, 0.5 cm; B, C, 0.25 cm.
FIG. 4 in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 4. — Trilobite rank-ordered abundance distributions for different samples from the offshore facies in Cordillera Oriental. Relative abundance is logged on the y axis, and taxa are ordered according to their relative abundance on the x axis. Asaphellus Callaway, 1877 is indicated in white. DLA stands for the Quebrada del Arenal (Tremadocian), Vz stands for the Quebrada Vizcacha (Cambrian Stage 10), and TotA stands for the Quebrada Totora (Cambrian Stage 10). The data, nomenclature, and sample location for the Cambrian outcrops come from Balseiro et al. (2011b).
FIG. 10. — Asaphellus isabelae n in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 10. — Asaphellus isabelae n. sp.: A, hypostoma, latex cast, dorsal view, CEGH-UNC 25749; B, hypostoma, dorsal view, CEGH-UNC 25752; C, right free cheek, dorsal view, CEGH-UNC 25750; D, left free cheek, latex cast, dorsal view, CEGH-UNC 25756; E, holotype cranidium, dorsal view, CEGH-UNC 25751; F, cranidium, latex cast, dorsal view, CEGH-UNC 25753; G, left free check, dorsal view, CEGH-UNC 25754; H-J, L, pygidia, dorsal view; H, CEGH-UNC 25755; I, CEGH-UNC 25758; J, CEGH-UNC 25757; L, CEGH-UNC 25760; K, pygidium, latex cast, dorsal view, CEGH-UNC 25759; M, almost complete moult, dorsal view, CEGH-UNC 25761. All specimens come from the Quebrada del Arenal, Santa Rosita Formation, Santa Victoria Group; A, C-E, G-J, L, M, come from DLA 28; B, F, K, come from DLA 30. Scale bars: A, B, 0.25 cm; C-M, 0.5 cm.
FIG. 3 in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 3. — Biostratigraphic scheme for Cordillera Oriental and ranges of the different Asaphellus Callaway, 1877 species recognized in the basin from Parabolina (N.) frecuens argentina Zone to Bienvillia tetragonalis Zone. Biostratigraphy modified from Albanesi et al. (2008) and Vaccari et al. (2010). Asaphellus cf. aspinus in Tortello & Esteban (2003); Asaphellus sp. in: *, Tortello & Esteban 2007; **, Tortello et al. 2013.
FIG. 1 in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 1. — Map showing location of the Central Andean Basin and studied localities in the Argentinean Cordillera Oriental. Data from 2-6 come from Harrington & Leanza (1957) and Balseiro et al. (2011a). Localities: 1, Quebrada del Arenal, Huacalera area (sampled for this study); 2, Angosto del Ferrocarril, Angosto de Chucalezna; 3, Quebrada Rupasaca, Alfarcito area; 4, Quebrada Colorada, Iruya; 5, Quebrada del Toro, Cardonal Formation, Pascha-Incamayo area. Modified from Astini (2003).
FIG. 7. — A, B in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 7. — A, B, Asaphellus sp. 2, pygidia in dorsal view: A, CEGH-UNC 25763; B, CEGH-UNC 25764; C-F, Asaphellus sp. 1, CEGH-UNC 25765-25768; C, pygidium, latex cast, dorsal view, CEGH-UNC 25765; D, pygidium, dorsal view, CEGH-UNC 25766; E, pygidium, dorsal view, CEGH-UNC 25765; F, pygidium and thorax, dorsal view, CEGH-UNC 25767; G, A. isabelae n. sp., articulated juvenile, latex cast, dorsal view, CEGH-UNC 25762. Scale bars: A-F, 0.5 cm; G, 0.25 cm. All specimens come from the Quebrada del Arenal, Santa Rosita Formation, Santa Victoria Group: A, B, G, from DLA 28; C, E, from DLA 25; D, F, from DLA 20.
FIG. 9. — A in Diversification of Asaphellus Callaway, 1877 (Asaphidae: Trilobita) during the Tremadocian in South West Gondwana (Cordillera Oriental, Argentina)
FIG. 9. — A, reconstruction of A. stenorhachis (Harrington, 1938); B, reconstruction of A. isabelae n. sp. Drawing by Santiago Druetta.
Figure 6 in Homalonotid trilobites from the Silurian and Lower Devonian of south-eastern Australia and New Zealand (Arthropoda: Trilobita: Homalonotidae)
Figure 6. Facies and environmental distribution of Australian homalonotids.
Figure 7 in Homalonotid trilobites from the Silurian and Lower Devonian of south-eastern Australia and New Zealand (Arthropoda: Trilobita: Homalonotidae)
Figure 7. Morphological terms for the homalonotid exoskeleton.
Supplementary figures from: Is 3D, a more accurate quantitative method than 2D, crucial for analyzing disparity patterns in extinct marine arthropods (Trilobita)?
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Post-embryonic development of Fritzolenellus suggests the ancestral morphology of the early developmental stages in Trilobita
<p>Trilobite development has been intensively explored during past decades, but information about ancestral character combinations in the early developmental stages of trilobites remains virtually unknown. Trilobites of the superfamily Olenelloidea are one of the earliest diverging groups. Study of their development coupled with the development of other early diverging trilobite groups can provide crucial information about the ancestral morphology of trilobite early stages. Herein we describe numerous well-preserved specimens of the olenelloid trilobite <em>Fritzolenellus lapworthi</em>. The earliest stages have circular cephala bearing intergenal spines and lacking genal spines. During subsequent development, morphological changes comprise the modification of the cephalic shape from circular to semi-circular, expansion of LA, gradual shortening of intergenal spines and origin and prolongation of genal spines. Trunk development of <em>Fritzolenellus</em> suggest that the development of macropleurae and macrospines are two independent processes and that origin of the opistotrunk is linked with the onset of phase 5 of cephalic development. The morphology of the early developmental stages of <em>Fritzolenellus</em> and some related taxa differs in many aspects from the morphology of equivalent stages of some other members of Olenelloidea. Consequently, two basic morphotypes are recognized during the early development of Olenelloidea – the <em>Fritzolenellus</em> and the <em>Olenellus</em> morphotypes. Comparison with Fallotaspidoidea and Redlichiina reveals that early developmental stages of these taxa share character combinations that are typical for <em>Fritzolenellus</em> morphotype. Such a comparison suggests that characters defining <em>Fritzolenellus</em> morphotype are ancestral for Trilobita. The <em>Olenellus</em> morphotype is likely a derived condition within Olenelloidea and might be related to predator deterrence.</p>
FIGURE 5 in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 5. Graphical representation of the seven distinct size categories within meraspid degrees M9 and M10 of Trimerocephalus chopini n. sp., based on measurements of hundreds of queue specimens from Kowala Quarry (see Radwański et al., 2009). Meraspides are shown in dorsal view.
FIGURE 2 in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 2. Partially complete meraspis (degree M10; librigenae absent) of Trimerocephalus chopini n. sp. from Early Famennian marly shales at Kowala Quarry, Holy Cross Mountains, central Poland. A and B: Dorsal and oblique lateral views, respectively. C: Enlargement of pygidium.
FIGURE 3 in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 3. Meraspides (degrees M8-M10) of Trimerocephalus chopini n. sp. from Early Famennian marly shales at Kowala Quarry, Holy Cross Mountains, central Poland. A: Incomplete, exfoliated, dorso-laterally deformed meraspis M8 in dorsal view (pygidium is absent). B: Almost complete meraspis M9 in dorsal view (pygidium is not intact). C: Complete, slightly deformed meraspis M8 with partially visible pygidium, in dorsal view. D and E: Nearly complete, slightly deformed meraspis M10 (librigenae absent) in oblique posterior and dorsal views, respectively. F: Incomplete and dorsally deformed meraspis M10 (holotype; ZPAL Tr.8/12.02.79) in dorsal view (pygidium absent).
FIGURE 1. A in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 1. A: Map of Poland with the location of the Holy Cross Mountains region (grey rectangle). B: Generalised geologic map of the Holy Cross Mountains region and the location of Kowala Quarry (black arrow). C: Map of Kowala Quarry with the location of the studied section exposed in the western part of the northern quarry wall indicated by the black arrow.
FIGURE 4 in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 4. Almost complete internal mould of a holaspid(?) cephalon of Trimerocephalus chopini n. sp. from Early Famennian marly shales at Kowala Quarry, Holy Cross Mountains, central Poland. A–C: Dorsal, anterior and lateral views, respectively. D: Oblique ventral view showing vincular furrow. E: Details of weakly crenulated genal part of vincular furrow, with white arrows indicating shallow pits.
FIGURE 6 in A new Trimerocephalus species (Trilobita, Phacopidae) from the Late Devonian (Early Famennian) of Poland
FIGURE 6. Bivariate plot of cephalic length (mm) versus width (mm) in meraspid degrees M9 and M10 of Trimerocephalus chopini n. sp. Presented data include only complete, undeformed specimens from the queues (see Radwański et al., 2009).
Six supplementary figures from: 3D, a more accurate quantitative method than 2D: crucial for analyzing disparity patterns in extinct marine arthropods (Trilobita)?
<p>The pdf file is structured to provide six supplementary figures from: 3D, a more accurate quantitative method than 2D: crucial for analyzing disparity patterns in extinct marine arthropods (Trilobita)?</p>
Post-embryonic development of Fritzolenellus suggests the ancestral morphology of the early developmental stages in Trilobita
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Data from: Early post-embryonic development in Ellipsostrenua (Trilobita, Cambrian, Sweden) and the developmental patterns in Ellipsocephaloidea
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