Postcranial functional adaptations in the South American Miocene borhyaenoids (Mammalia,Metatheria): Cladosictis,Pseudonotictis and Sipalocyon

Three Santacrucian borhyaenoids, Cladosictis patagonica, Pseudonotictis pusillus and Sipalocyon gracilis, are analyzed from a functional-adaptive perspective. Five extant placentals and one marsupial model are also examined in order to interpret the locomotor adaptations of these fossils. Pseudonotictis pusillus is the smallest of the Santacrucian borhyaenoids and is known from fragmentary remains; from its small size, dental specializations and elbow anatomy, this species was certainly not far ecologically from an extant weasel. The postcranium of Sipalocyon gracilis, although poorly known, suggests climbing capabilities, and the pseudo-opposable pollex indicates skilful manipulative behaviour. Cladosictis patagonica was an active predatory form, short-legged and able to climb, although it was a less specialized arboreal form than the contemporaneous Prothylacinus patagonicus; the proportions of its limbs recall that of a living South American marten, the tayra. The pseudo-opposable pollex of Cladosictis, as in Sipalocyon, indicates skilful manipulative behaviour.     

Functional-adaptive features and palaeobiologic implications of the postcranial skeleton of the late Miocene sabretooth borhyaenoid Thylacosmilus atrox (Metatheria)

A functional-adaptive study of the postcranium of two late Miocene sabretooth borhyaenoid specimens (Mammalia, Metatheria) is presented. Thylacosmilus atrox developed a longer neck than in non-sabretooth borhyaenoids and was capable of strong flexion of the head. The lower back is well-stabilized and more rigid than in the other borhyaenoids. The forelimb appears well-suited for manipulating and capturing prey, with a probably well-developed deltoid and pectoral musculature. Compared with other Miocene borhyaenoids, the hip joint of Thylacosmilus is modified to allow greater postural flexibility (e.g. possibility of erect stances). The low greater femoral trochanter, the short and sigmoid tibia, and the semiplantigrade hind foot of Thylacosmilus precluded fast running. Thylacosmilus killed by stabbing, a peculiar mechanism that evolved in parallel in many other sabretooth taxa. This technique has significant functional-adaptive consequences on the postcranial skeleton, superimposed on the generalized morphological pattern reflected in its non-sabertooth relatives. The superficial similarities observed between Thylacosmilus and Smilodon overshadow real differences (at the level of joint patterns and muscular groups involved in particular movements), a condition that suggests the development in the marsupial form of a morphological type unique to the thylacosmilid lineage within Borhyaenoidea.     

Trace fossils on penguin bones from the Miocene of Chubut,southern Argentina

Several traces of biological interaction were found on penguin bones from the basal levels (Aquitanian) of the Miocene Gaiman Formation in the lower Chubut valley of the Provincia del Chubut, Argentina. The fossil-bearing beds were deposited in littoral to sublittoral environments within sediments of mostly pyroclastic origin. We interpret many traces to have been produced by predators and/or scavengers while the penguins were still in a breeding area. Many bones show cracking marks due to aerial exposure. The material is disarticulated as is usual in recent breeding areas. Potential predators were coeval terrestrial mammals, most probably marsupial carnivores. After a marine transgression, these bones were buried or exposed on the sea bottom where they could be colonized by algae, sponges, cnidarians, and other benthic organisms. We identified sponge borings in several bones. Other traces are interpreted to have been produced by echinoderms feeding on sponges or algae. No evidence of other invertebrate predators such as muricid or naticid gastropods, or decapods was found. Finally, other traces appear to have been generated by shark and possibly teleostean vertebrates feeding on epibionts. One coracoid is interpreted to have been marked by a shark that is common in the Gaiman Formation, the carcharhiniform Galeocerdo aduncus. From an ethological (Seilacherian) classification, traces on bones from the Gaiman Formation include Domichnia (sponge perforations), Praedichnia (terrestrial marsupials, sharks, teleosteans) and Pasichnia (echinoderms). Remarkably, remains of marine organisms with skeletons made of calcium carbonate are very poorly preserved in the Gaiman Formation. Only large oysters, sparse shell fragments, skeletal moulds, and bioturbation is evident. The fossil assemblage is mainly composed of phosphatic (e.g. teeth, bones, crustacean parts) and siliceous (sponge spicules, diatoms) remains.     

Genyornis eggshell (Dromornithidae; Aves) from the Late Pleistocene of South Australia

Fossil eggshell fragments from a sand dune near Port Augusta are attributed to the extinct dromornithid, Genyornis newtoni Stirling & Zietz. Shell curvature measurements show that the eggs were larger than those of the Emu, Dromaius novaehollandiae. Radiocarbon dates indicate an age in excess of 40,680 BP. Holes pierced through some fragments are attributed to the action of predators.     

Hominid–Carnivore Coevolution and Invasion of the Predatory Guild

Coevolution is defined as reciprocal selective pressures that operate to make the evolution of one taxon partially dependent on the evolution another. This process often involves multiple species exploiting shared limiting resources. In classic coevolutionary models, populations of sympatric species are seen to diverge in one or more morphological, ecological, or behavioral traits to effect more even partitioning of resources and reduce levels of interspecific competition. Character displacement and resource partitioning are thought to be central not only to how species coexist on limited resources, but also to how species invade new resource niches. Hominid invasion of the predatory guild at least 2 my ago would have brought them into contact with a range of new selective pressures including competition with a number of large-bodied predators. This study explores resource partitioning between hominids and other Plio-Pleistocene large-bodied predators through analyses of predator food transport strategies. The anatomical content (head/limb MNE) of hominid transported faunal assemblages at Bed I Olduvai and FxJj 50 (Koobi Fora), when compared to modern predator control cases, suggests that Plio-Pleistocene hominids practiced food transport strategies intermediate between those of top predators such as wolves and those of confrontational scavengers such as spotted hyaenas. Plio-Pleistocene hominid food transport strategies do not resemble those of nonconfrontational scavengers such as brown and striped hyenas. The highly regular patterns differentiating bone assemblages accumulated by top predators, hominids, and confrontational and nonconfrontational scavengers suggest that hominid invasion of the predatory guild involved resource partitioning potentially based on some form of character displacement.     

Palaeopathology of a crocodile femur from the Pliocene of eastern Australia

A large fossilized crocodilian left femur recovered from the Pliocene Chinchilla Local Fauna of southeastern Queensland, Australia, exhibits a region of proliferative bone, consistent with an episode of osteitis. The nature and location of the pathology suggest a simple fracture with puncture wounds, possibly the result of a crushing bite of another crocodile, followed by infection. The size and morphology of the femur most closely resembles the now extinct Plio-Pleistocene crocodile Pallimnarchus.     

Late Pleistocene Eemian hyena and steppe lion feeding strategies on their largest prey—Palaeoloxodon antiquus Falconer and Cautley 1845 at the straight-tusked elephant graveyard and Neanderthal site Neumark-Nord Lake 1, Central Germany

The scavenging activities of hyenas and lions at the Neumark-Nord Lake 1 (Central Germany) site on straight tusk elephant carcasses is commonly documented by slight bone damages and initial skeleton partitioning. Canine bite marks are found at several joints of elephant long bones, as well as on the vertebrae and skulls. Deep bite and scratch marks from 5 to 7 mm in width made by large carnivore canine teeth (Panthera leo spelaea, Crocuta crocuta spelaea) on the ventral vertebral columns and pelvises of two Palaeoloxodon antiquus straight-tusked elephant skeletons suggest that the intestines and inner organs were consumed by both large lion/hyena predators as is commonly observed when modern African lions and spotted hyenas feed on contemporary elephant carcasses. A scavenging strategy can be demonstrated using 24 partly preserved Palaeoloxodon skeletons, where Ice Age spotted hyenas appear to be the main scavenger (95 %) and sole skeleton decompositor such as bone destructor. While Crocuta may feed anywhere on an elephant carcass, they are known to specialize to eat the complete feet, whereas scavenging from the anus into the body cavity (intestine/internal organ feeding) is more typical of lions. Shallow water at Neumark-Nord Lake 1 prevented hyenas from completely scavenging elephants; thus, bone damage at this site was constrained to initial stages of destruction and final carcass partitioning by high water stands and floods.     

Archaeological associations with extinct pleistocene mammals in North America

It has often been argued that there are insufficient associations between extinct Pleistocene mammalian genera and cultural materials to support the argument that human predation played a major role in causing the extinctions. This argument assumes that there are many records for most or all of the extinct mammals that date to the very end of the Pleistocene. An analysis of a sample of radiocarbon dated sites with extinct mammals and younger than 12,000 BP suggests that this criticism of the overkill hypothesis is weakly based.     

Verzeitlichungs- und Historisierungstendenzen in der frühen Geologie und Paläontologie

Steno described in 1669 geological sections which were interpreted as the result of a series of earlier events. Steno used actuogeological methods. This was the first step towards temporalizing nature. Steno was succeeded by a lot of other researchers from different European countries. It is amazing to see, that “actualism” was widespread during the 18th century. The next step was the discovery that fossils are extinct beings (Ray, Hooke and others). Using methods of comparing anatomy W. Hunter (forerunner of Cuvier) could prove in 1769 that the Mastodon is an extinct vertebrate. The work of Soulavie in France (1780) is stressed. He held in his hand the key for solving the problem of index-fossils. About 1800 the importance of fossils for stratigraphy and describing a history of the earth was recognized. Theories and hypotheses were needed to explain the fossil documents (strange shells in older strata and higher developed mammals in younger strata). All these theories couldn't propose a feasible mechanism for the change of beings during the history of the earth. But it could be said, that all fossils proove a history of life and the earth i. e. a progressive development in one sense, a development which is not reversible.     

Big fish and great auks: Exploitation of birds and fish on the Isle of Portland,Dorset, during the Romano-British period

Abstract

The paper considers the assemblage of bird and fish bones from a Romano-British settlement on the Isle of Portland, on the southern coast of England. Compared with contemporary sites, the assemblage includes an unusually large number of fish bones from a wide range of marine species, including large cod, other Gadidae, several species of seabream, scad and bass. The bird assemblage includes bones of a butchered great auk. This provides the first evidence that this extinct species was nesting off the shores of central southern England and being exploited for food in this period. Other seabirds identified included razorbill, great northern diver and gannet. The species represented are discussed in relation to other Romano-British sites, particularly the Roman town of Dorchester, situated 15 km away. Many of the species have been discovered on only a few contemporary sites and the presence of the seabream in particular indicates that seawater temperatures may have been warmer than until very recently. Possible cultural changes in diet and food procurement in the Roman period are also considered.     

On the identity of Euowenia robusta De Vis, 1891 with a description of a new zygomaturine genus

An occluded skull and dentaries, recovered from the Floraville Local Fauna, northern Queensland, is referred to Euowenia robusta De Vis, 1891. The specimen has distinctive zygomaturine features including a quinquetubercular upper third premolar and lower molars with cristids obliqua, directly challenging the synonymy of E. robusta with Nototherium inerme and N. mitchelli proposed by Woods (1968 Woods, J. T. 1968. The identity of the extinct marsupial genus Nototherium Owen. Memoirs of the Queensland Museum, 15: 111–116.  [Google Scholar]). Comparison with the genotypic Euowenia grata (De Vis, 1887) has further confirmed that E. robusta does not belong within the Diprotodontinae. After examining all named zygomaturine genera, including a large data set of Zygomaturus trilobus Macleay, 1858, it is concluded that Euowenia robusta can not be placed within any known zygomaturine genus and, therefore, a new genus is proposed. It is perhaps the most derived of all the zygomaturines described to date from the Australian Cenozoic.     

Fitzroy's fighting Fuegians: Comparison of palaeopathological and ethnographic indications of fighting behaviour in an extinct human population

The Selk'nam were an indigenous population of Tierra del Fuego that are now extinct. Contemporary accounts, including those of Robert Fitzroy and Charles Darwin, attest to their prodigious size and strength. These accounts and others record that the Selk'nam were enthusiastic wrestlers and fought till one or other of the opponents could no longer continue. Presented here is a case of traumatic injury to the ulnae and radii of a Selk'nam male that is concomitant with injuries sustained during such activity and as such would provide intriguing evidence of this practice in the skeletal record of an extinct human population. Copyright © 2010 John Wiley & Sons, Ltd.     

American home: Predatory mortgage capital and neighbourhood spaces of race and class exploitation in the United States

Predatory home mortgage lending has become a central concern for housing research, public policy and community activism in US cities. Regulatory attempts to stop abuses, however, are undermined by claims that ‘predatory’ cannot be defined or distinguished from legitimate subprime lending, and claims that the industry performs a public service by meeting the needs of low‐income, high‐risk consumers (many of them racially marginalized) who would have been denied credit in previous years. We evaluate these claims in historical‐geographical context, drawing on David Harvey's theory of class‐monopoly rent to analyse what is new (and what is not) in contemporary financial exploitation. We use a mixed‐methods approach to (1) provide econometric measures of subprime racial targeting and disparate impact that cannot be blamed on the supposed deficiencies of borrowers, (2) qualitatively assess the rationale for judging particular subprime practices and lenders as predatory, and (3) trace the connections between local practices and transnational investment networks. The fight against predatory lending cannot succeed, we argue, without a renewed analytical and strategic emphasis on the class dimensions of financial exploitation and racial‐geographical discrimination.     

Approaches to marsupial biochronology in Australia and New Guinea

Mammal (marsupial) palaeontology is useful for the correlation of non-marine strata of Australia and New Guinea. The geochronological framework constructed from marsupial data is based substantially in stage-of-evolution biochronology, which is not subject to the formal guidance of a code, or regulation by an authority. Instead, it has evolved through an informal consensus of usage. Principles and practices of stage-of-evolution biochronology and its historical development are reviewed from an Australian perspective. Amongst more recent developments in the discipline are the establishment of the first marsupial biostratigraphy for the continent, covering the Etadunna Formation of the Lake Eyre Basin (Woodburne et al., 1993), and the introduction of novel terminology to express marsupial succession in the Carl Creek Limestone of northwestern Queensland (Archer et al., 1989). The merits of the various approaches to biochronology are examined: stage-of-evolution biochronology has provided, and will continue to contribute to, a correlation framework for a continent with a sparse mammal record not generally amenable to biostratigraphic resolution. Terminology proposed by Archer et al. (1989) is shown to be unsatisfactory.     

Holocene archaeological evidence of extinct and very rare British Scarabaeoidea

Abstract

The analysis of British Holocene insect assemblages has discovered nine species of scarabaeoid dung beetles which are now extinct in Britain and two more that are extremely rare. Some of these species had been suspected as native by early 19th century entomologists but doubt had been cast on specimens in old collections of British Coleoptera. Eight are dung feeders which, although they would have initially been favoured by clearance for pasture and a possible warm climate episode in the middle Bronze Age, subsequently declined as a result of increasing cultivation and a slight cooling of the summer climate. The other three species probably became extinct due to human-induced habitat loss.     

Bite marks on an ichthyodectiform fish from Australia: possible evidence of trophic interaction in an Early Cretaceous marine ecosystem

Wretman, L. & Kear, B.P., 2013. Bite marks on an ichthyodectiform fish from Australia: possible evidence of trophic interaction in an Early Cretaceous marine ecosystem. Alcheringa 38, 000–000. ISSN 0311-5518.

A well-preserved fish skull from late Albian deposits of the Allaru Mudstone near Richmond in Queensland displays a conspicuous V-shaped pattern of indentations, punctures and depression fractures consistent with a vertebrate bite trace. This is the first direct evidence of trophic interaction between vertebrates within an Early Cretaceous marine ecosystem from Australia. The specimen is taxonomically referable to the large-bodied (ca 1?m snout–tail length) ichthyodectiform Cooyoo australis, but the size and spacing of the tooth marks is incompatible with attack by a conspecific individual. The lack of osseous growths concordant with healing also suggests that the bite occurred shortly before or after the animal’s death. Comparison with the dentitions of other coeval vertebrates indicates compatible tooth arrangements in longirostrine amniote predators such as polycotylid plesiosaurians, ornithocheiroid pterosaurs and especially the ichthyosaurian Platypterygius. The implications of this as a potential predator–prey association are that Early Cretaceous actinopterygians occupied middle-level trophic niches and were in turn consumed by higher-level amniote carnivores, similar to many extant marine vertebrate communities of today.

Lovisa Wretman [lovisa.wretman@ebc.uu.se], Subdepartment of Evolution and Development, Department of Organismal Biology, Uppsala University, Norbyvägen 18A, SE-752 36 Uppsala, Sweden (address for correspondence); Benjamin P. Kear [benjamin.kear@geo.uu.se], Palaeobiology Programme, Department of Earth Sciences, Uppsala University, Villavägen 16, SE-752 36 Uppsala, Sweden. Received 8.8.2013, revised 17.9.2013, accepted 23.9.2013.     

Past human exploitation of birds on the Isle of Man

This paper makes comparisons between various sources—historical, ethnographic and archaeological—that relate to birds on the Isle of Man, in order to give a picture of the former uses of birds by the Manx people. Written references suggest that seabirds in particular were an important source of the essentials of life, and this is reinforced by recent archaeological evidence. The bird bones discussed are from excavations at St Patrick's Island off the west coast and Castle Rushen, Castletown. Manx Shearwaters Puffinus puffinus were present in greater numbers than they are now, and two fragments of the now extinct great auk Pinguinis impennis were identified, confirming the presence of this species on the Isle of Man. The evidence points to over-harvesting of the shearwaters and members of the auk family. © 1997 John Wiley & Sons, Ltd.     

The water chestnut (Trapa natans L.) as a food resource during the 4th to 1st millennia BC at Lake Federsee,Bad Buchau (southern Germany)

Abstract

During archaeological excavations at several wetland sites around Lake Federsee, remains of water chestnut were detected. The finds are dated to between the 4th and 1st millennia BC. Until recently the starch-containing nuts of water chestnut were used for human nutrition in Europe. The nuts can easily be harvested in autumn. Pollen and plant macrofossil remains from several sites are proof of a wide distribution during the Holocene, probably influenced by humans. Nowadays this annual water plant is extinct in many parts of Europe. The growing conditions of water chestnut are strongly restricted with regard to water quality, depth and temperature, and therefore finds of this plant have the potential to allow reconstruction of former ecological conditions.     

Manganese Black Pigments in Prehistoric Paintings: the Case of the Black Frieze of Pech Merle (France)

Different black pigments of natural origin (mineral or organic) have been examined by means of several analytical methods (colour measurements, elemental analysis and structural analysis). The results, after being compared with each other, then served as reference points in the study of the ‘Black Frieze’ of the cave of Pech Merle (Lot). After that, colour measurement was investigated in situ on the paintings as a means of displaying small differences (in hue or chroma) between the black colours. The aim of this study was to verify several hypotheses concerning the techniques used by the painters of Pech Merle, and specifically by the one(s) of the Black Frieze. A first objective was that of identifying the nature and, if possible, the origin of the black pigments used in these figures. A second objective was that of determining in which parts of the frieze one or the other (or one and the other) had been used; and the final objective was to provide new technical information that might help us better to understand how the Pech Merle frieze was produced, whether by a single painter and in one episode, for the most part, or, on the contrary, in several episodes and by a succession of different painters.     

Can Lithic Attribute Analyses Identify Discrete Reduction Trajectories? A Quantitative Study Using Refitted Lithic Sets

Quantitative, attribute-based analyses of stone tools (lithics) have been frequently used to facilitate large-scale comparative studies, attempt to mitigate problems of assemblage completeness and address interpretations of the co-occurrence of unrelated technological processes. However, a major barrier to the widespread acceptance of such methods has been the lack of quantified experiments that can be externally validated by theoretically distinct approaches in order to guide analysis and confidence in results. Given that quantitative, attribute-based studies now underpin several major interpretations of the archaeological record, the requirement to test the accuracy of such methods has become critical. In this paper, we test the utility of 31 commonly used flake attribute measurements for identifying discrete reduction trajectories through three refitted lithic sets from the Middle Palaeolithic open-air site of Le Pucheuil, in northern France. The experiment had three aims: (1) to determine which, if any, attribute measurements could be used to separate individual refitted sets, (2) to determine whether variability inherent in the assemblage was primarily driven by different reduction trajectories, as represented by the refitted sets, or other factors, and (3) to determine which multivariate tests were most suitable for these analyses. In order to test the sensitivity of the sample, we ran all analyses twice, the first time with all the available lithics pertaining to each refitted set and the second time with randomly generated 75 % subsamples of each set. All results revealed the consistent accuracy of 16 attribute measurements in quadratic and linear discriminant analyses, principal component analyses and dissimilarity matrices. These results therefore provide the first quantified attribute formula for comparative analyses of Levallois reduction methods and a basis from which further experiments testing core and retouch attributes may be conducted.