2,877 research outputs found
Las entrevistas de RadioPhonium con Dr. Edwin Cadena
No full textPara esta emisión en #Radiophonium, hablamos de paleontología con el Dr. Edwin Cadena, profesor asociado de la Facultad de Ciencias Naturales de la Universidad del Rosario. Actividades del Archivo y cierre musical, con homenaje a Elza Soares
Edwin Gaustad oral history interview.
No full textOral history interview with Edwin Gaustad conducted by David Marshall, originally recorded May 1, 2007, in Santa Fe, New Mexico. Accompanied by one finding aid.Dr. Gaustad, a retired history professor and renowned author of American religion, talks about his life, family, education, publications and interests
Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
No full textRUEDA, EDWIN ALBERTO CADENA, GAFFNEY, EUGENE S. (2005): Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia. American Museum Novitates 3470 (1): 1-20, DOI: 10.1206/0003-0082(2005)4702.0.CO;2, URL: http://www.bioone.org/perlserv/?request=get-abstract&doi=10.1206%2F0003-0082(2005)470%3C0001%3ANZANST%3E2.0.CO%3B
Fig. 4. Notoemys zapatocaensis, n in Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia
No full textFig. 4. Notoemys zapatocaensis, n.sp. Key to figure 3. Scales labeled on left, bones on right.Published as part of RUEDA, EDWIN ALBERTO CADENA & GAFFNEY, EUGENE S., 2005, Notoemys zapatocaensis, a New Side-Necked Turtle (Pleurodira: Platychelyidae) from the Early Cretaceous of Colombia, pp. 1-20 in American Museum Novitates 3470 (1) on page 7, DOI: 10.1206/0003-0082(2005)4702.0.CO;2, http://zenodo.org/record/538292
[Note by an unknown author, addressed to General Edwin Walker]
No full textPhotocopy of a partially illegible note by an unknown author, from an envelope addressed to General Edwin Walker
Khosatzky and Mlynarski, 1971 (Testudines: Lindholmemydidae), from the Late Cretaceous of Mongolia with Comments on Bone Histology and Phylogeny
No full textFIG. 3. Mongolemys elegans paratype IGM 90/11, isolated left otic chamber-quadrate: A–B, anterior view; C–D, medial view; E–F, posterior view. Abbreviations: ex, exoccipital; faf, fossa acustico-facialis; fnt, foramen nervi trigemini; ha, hiatus acusticus; op, opisthotic; pr, prootic; qu, quadrate; sa, surangular; scm, sulcus cartilaginous meckelii; so, supraoccipital; sq, squamosal.Published as part of Cadena, Edwin A., Ksepka, Daniel T. & Norell, Mark A., 2013, New material of Mongolemys elegans Khosatzky and Mlynarski, 1971 (Testudines: Lindholmemydidae), from the Late Cretaceous of Mongolia with comments on bone histology and phylogeny, pp. 1-28 in American Museum Novitates 2013 (3766) on page 7, DOI: 10.1206/3766.2, http://zenodo.org/record/536096
Edwin Kinney Wright
No full textPhotograph - A portrait of Dr. Edwin Kinney Wright, Athabasca, Albert
The first fossil of a marine turtle has been found in Colombia: and the turtle was pregnant!
No full textEl hallazgo del fósil de 125 millones de años no solo posibilita comprender la evolución y aspectos reproductivos de estos reptiles antiguos, sino que trasciende a sus descendientes actuales. Lo obtenido en la investigación permite entender la historia de la biodiversidad, para así crear una mayor conciencia sobre la conservación de la fauna, en particular de las tortugas marinas altamente amenazadas por la contaminación de los océanos, la caza indiscriminada y efectos del cambio climático. El estudio estuvo liderado por el profesor de la Facultad de Ciencias Naturales y Matemáticas, Edwin Alberto Cadena.The discovery of a 125 million years-old fossil not only makes it possible to understand the evolution and reproductive aspects of these ancient reptiles, but it also throws light on their current descendants. The findings of the research enable us to understand the history of biodiversity and thus heighten awareness of the need to conserve fauna, particularly marine turtles which are severely endangered by the contamination of oceans, indiscriminate hunting and the effect of climate change. The study was led by Professor Edwin Alberto Cadena, of the Faculty of Natural Sciences and Mathematics
The first fossil of a marine turtle has been found in Colombia: and the turtle was pregnant!
No full textEl hallazgo del fósil de 125 millones de años no solo posibilita comprender la evolución y aspectos reproductivos de estos reptiles antiguos, sino que trasciende a sus descendientes actuales. Lo obtenido en la investigación permite entender la historia de la biodiversidad, para así crear una mayor conciencia sobre la conservación de la fauna, en particular de las tortugas marinas altamente amenazadas por la contaminación de los océanos, la caza indiscriminada y efectos del cambio climático. El estudio estuvo liderado por el profesor de la Facultad de Ciencias Naturales y Matemáticas, Edwin Alberto Cadena.The discovery of a 125 million years-old fossil not only makes it possible to understand the evolution and reproductive aspects of these ancient reptiles, but it also throws light on their current descendants. The findings of the research enable us to understand the history of biodiversity and thus heighten awareness of the need to conserve fauna, particularly marine turtles which are severely endangered by the contamination of oceans, indiscriminate hunting and the effect of climate change. The study was led by Professor Edwin Alberto Cadena, of the Faculty of Natural Sciences and Mathematics
Podocnemis tatacoensis Cadena & Vanegas 2023, n. sp.
No full textPodocnemis tatacoensis n. sp. (Figs 1; 3) urn:lsid:zoobank.org:act: D0A48C11-8B8C-44BE-AF28-E5348C9051B9 HOLOTYPE. — Specimen VPPLT-1727, nearly complete shell missing: left peripheral 1; the most anteromedial portion of nuchal; left costal 4; portions of left costals 2, 3, and 5; right costal 2, portions of right costal 5, peripherals 8, 9, and 10; portions of peripherals 9-11; portion of the left epiplastron, and the most anteromedial region of hyoplastron. DIAGNOSIS. — Podocnemis tatacoensis n. sp., differs from all other extant species of Podocnemis by having eight neurals, of which neural 8 interrupts the medial contact between costals 7 and the most anteromedial portion of costals 8. It shares with P. unifilis, P. vogli and P. erythrocephala three lateral musk ducts in each hyoplastron-peripherals contact. It shares with P. unifilis, P. sextuberculata and P. negrii keeled neurals. It shares with all extant Podocnemis spp. a nuchal bone being much wider than long. It shares with all extant and many fossil pelomedusoids (except P. pritchardi) a nearly rounded mesoplatra. It shares with all extant podocnemidids (Podocnemis spp., Erymnochelys madagascariensis and Peltocephalus dumerilianus) at least one musk foramen located at the most anterior tip of the sutural contact between hyoplastron and peripherals (axillary buttress region). TYPE LOCALITY. — La Repartidora locality (3°19’40.98”N, 75°5’58.63”W), La Tatacoa Desert, Huila Department, Colombia. ETYMOLOGY. — ‘ tatacoensis ’, from the Tatacoa Desert. STRATIGRAPHY, OCCURRENCE AND AGE. — Southeast from the Centro Poblado La Victoria, La Repartidora locality (3°19’40.98”N, 75°5’58.63”W), La Tatacoa Desert, Huila Department, Colombia. Lower segment of La Victoria Formation (Guerrero 1997), Middle Miocene (Serravallian) 13.778 ± 0.081 Ma (Flynn et al. 1997). San Alfonso Beds (Montes et al. 2021) (Fig. 2A). A Gr. Fm. M n . 1 Cartographic Units B AGE (Ma) System Series Stage MOLECULAR FOSSIL RECORD An 0 C 5 Formation R n An 5 C . 2 5 Undifferentiated Formation Villavieja 12.21±0.107 Ma 2.5 5.3 Peltocephalinae Villavieja El Cardón Beds Red 23 MIOCENE Serravallian Group Honda R C AAn 5 2 Cerbatana Cerbatana Tatacoa La Venta Beds Beds Cong Red Beds. 12.93 12.512 ± ± 0.23 0.102 Ma Ma 34 56 Formation R1 Tatacoa Chunchullo Chunchullo Beds Sandstone Sandstone Beds Beds 13.342±0.408 P Podocnemis Podocnemis. Ma expansa cf pritchardi. 66 Peltocephalus Podocnemis Victoria ABn 5 C Cerro Cerro Beds Gordo Gordo Sandstone Beds 13.651±0.107 Ma 85.74 Ma La 13.778±0.081 Ma 100 . La San Alfonso Beds Podocnemis tatacoensis n. sp. DESCRIPTION AND COMPARISONS Carapace The carapace of Podocnemis tatacoensis n. sp. (Fig. 1A, B) is elongated (23.2 cm maximum length) with anterior (16.5 cm) and posterior (17.5 cm) regions exhibiting almost similar width. This aspect shows wide variation among podocnemidids, but it is very common that the carapace of P. expansa, P. lewyana and P. sextuberculata are wider in the posterior region, a condition maintained during their ontogeny. A similar shape is exhibited by the fossil Podocnemis pritchardi (here reattributed to the genus), but is unknown for P. medemi (here reattributed to the genus) and P. negrii (Carvalho et al. 2002, here reattributed to the genus) due to preservation. The bone surface of P. tatacoensis n. sp. is smooth as in almost all other extant and fossil podocnemidids. The carapace exhibits a low domed shape in lateral and anterior views (Fig. 1 C-E). The nuchal bone of P. tatacoensis n. sp. is trapezoidal in shape, being much wider than long. This was considered to be a diagnostic feature of Podocnemis by Gaffney et al. (2011). The neural series is composed of eight bones. This contrasts all extant Podocnemis and the fossil P. negrii, which exhibit seven neurals. Some specimens of P. sextuberculata and P. lewyana exhibit six neurals, similar to the fossil P. pritchardi, as well as the extant podocnemidid Erymnochelys madagascariensis. The neural series number is unknown for P. medemi due to preservation. In the extant podocnemidid Peltocephalus dumerilianus the number of neurals can be either eight or seven. Neural 8 of P. tatacoensis n. sp. hinder a medial contact between costals 7 and the most anteromedial portion of costals 8, but does not reach the suprapygal, as can be the case of other turtles with eight neurals as for example the bothremydid Cearachelys placidoi (Gaffney et al. 2006). Neurals 2-4 are moderately keeled dorsally (Fig. 3A, B) as in P. sextuberculata, P. negrii and some P. unifilis. Podocnemis tatacoensis n. sp. has eight pairs of costals, eleven pairs of peripherals, a suprapygal and a pygal bone, as in all other extant and fossil podocnenimidids specifically and most pelomedusoids in general. Costal 1 exhibits a strong axillary scar on the ventral surface that occupies most of the central portion of the bone and projects onto peripherals 2 and 3 (Fig. 3C, D). The left posterior margin of the carapace of P. tatacoensis n. sp. shows a pathology affecting peripherals 10, 11 and pygal (Fig. 3E), potentially caused by a predator attack. There is evidence that the individual recovered from this injury via bone remodeling, expressed as a major thickening and smooth surface of bone in this region (Fig. 3F). The sulci left by the scutes are well preserved in P. tatacoensis n. sp., lacking cervical scute as in all other pelomedusoids. There were five vertebral scutes, vertebral 1 reaching peripherals 1 anterolaterally as in all other podocnemidids and many other pelomedusoids. Vertebrals 2-4 had almost similar width, and vertebral 5 reached peripherals 10. Despite minor variations in the shape, all these vertebrals exhibit the same contacts between each other and pleurals, as well as covered the same bones (neurals, costals, peripherals, suprapygal, and pygal) as in all other extant and fossil podocnemidids. Podocnemis tatacoensis n. sp. had four pleural and twelve marginal scutes, as is common for podocnemidids.Published as part of Cadena, Edwin-Alberto & Vanegas, Rubén Dario, 2023, A new fossil turtle ends the controversy on the occurrence of the extant genus Podocnemis Wagler, 1830 at the Miocene fauna of La Venta, Colombia, pp. 127-138 in Geodiversitas 45 (3) on pages 129-132, DOI: 10.5252/geodiversitas2023v45a3, http://zenodo.org/record/768229
- …
