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Auckland, New Zealand

Mayall M.J.,Imperial College London | Wright V.P.,Natural science
Palaios | Year: 2015

We find the Ibarra et al. (2014) assertion that the Cotham Marble is an indicator of late Triassic mass extinction unconvincing. Their statement that a microbialite facies extends for over 2000km2 is misleading. A distinctive micritic bed is indeed widespread but the distribution of the microbialite facies is patchy and local. The fauna, flora, facies, and sedimentology above and below Cotham Marble are entirely consistent with it developing in a lagoonal setting in an overall transgression. Describing its depositional setting as a 'dead zone' is inappropriate and a distraction from understanding the complex depositional, tectonic, and environmental factors which caused a number of rapid changes in the facies, fauna, and flora during the late Triassic transgression succession in southwestern Britain. Microtubus communis is an important component in the construction of the digitate 'landscape' form of the Cotham Marble. Ibarra et al. (2014) have overlooked some key outcrops of the facies in North Somerset in which small mounds clearly show the intimate development of the start of vertical digitate morphologies associated with the presence of Microtubus communis. Copyright © 2015, SEPM (Society for Sedimentary Geology). Source

Thys T.M.,Ocean Sunfish Research and Tagging Program | Whitney J.,Hawaii Institute of Marine Biology | Hearn A.,University of California at Davis | Weng K.C.,University of Hawaii at Manoa | And 5 more authors.
Marine Biodiversity Records | Year: 2013

Ocean sunfish from the genus Mola, family Molidae, are the world's heaviest bony fish, reaching 2500 kg, primarily on a diet of gelatinous -Aooplankton. Three molid species are reported to occur in the Galápagos archipelago: Mola mola, Masturus lanceolatus and Ran-Aania laevis. To date, no genetic analysis of any molid has been conducted in Galápagos. In October 2011, tissue samples were obtained from nine sunfish at Punta Vicente Roca, Isabela Island, genetically analysed and found to be Mola ramsayi - the southern sunfish. This marks the first record of M. ramsayi in Galápagos waters. © Marine Biological Association of the United Kingdom 2013. Source

The sagittae mass asymmetry was in the teleost Carangoides caeruleopinnatus. The value of the asymmetry was calculated as the difference between the mass of the right and left paired otoliths, divided by average otolith mass. The results show that the absolute value of X in C. caeruleopinnatus does not depend on fish length and otolith growth rate, as it does in other symmetrical fish species. However, the absolute value of otolith mass difference increases with the fish length. The value of x falls between -0.2 and +0.2. Source

Wright V.P.,Natural science | Cherns L.,University of Cardiff
Journal of the Geological Society | Year: 2016

Ordovician change in the nature of seafloor carbonates saw rapid decline of previously widespread flat pebble conglomerates and the Palaeozoic peak abundance of hardgrounds. The effective disappearance of flat pebble conglomerates, widely attributed to physical disruption of substrate by bioturbation, is reinterpreted as reflecting increased depth of carbonate precipitation below the Taphonomically Active Zone such that early lithified carbonates were less frequently reworked by scour. With deeper, more stable zones of cementation, exhumed limestones formed hardgrounds, whose mid-Ordovician acme supported rapid increase in epizoan diversity. Further deepening of cementation to below normal scour accompanied post-Ordovician decline in submarine hardgrounds. © 2016 The Author(s). Published by The Geological Society of London. All rights reserved. Source

Hammer M.P.,Natural science | Hammer M.P.,South Australian Museum | Adams M.,South Australian Museum | Foster R.,South Australian Museum
Zootaxa | Year: 2012

South Australia is a large Australian state (∼1,000,000 km2) with diverse aquatic habitats spread across temperate to arid environments. The knowledge of freshwater fishes in this jurisdiction has advanced considerably since the last detailed catalogue of native and alien species was published in 2004 owing to significant survey and research effort, spatial analysis of museum data, and incidental records. The updated list includes 60 native and 35 alien species. New additions to the native fauna include cryptic species of Retropinna semoni s.l. (Weber) and Galaxias olidus s.l. (Günther). Two others have been rediscovered after long absences, namely Neochanna cleaveri (Scott) and Mogurnda adspersa (Castelnau). Range extensions are reported for native populations of Galaxias brevipinnis Günther, Leiopotherapon unicolour (Günther), Hypseleotris spp. (hybridogenetic forms) and Philypnodon macrostomus Hoese and Reader. There are five new alien species records (all aquarium species) including Phalloceros caudimaculatus (Hensel), Poecilia reticulata Peters, Xiphophorus hellerii Heckel, Astronotus ocellatus (Agassiz) and Paratilapia polleni Bleeker, with confirmation of Misgurnus anguillicaudatus (Cantor). Other range extensions for alien (exotic or translocated native) species in different drainage divisions (various modes of human-mediated dispersal) include Nematalosa erebi (Günther), Cyprinus carpio Linnaeus, Oncorhynchus mykiss (Walbaum), Salmo salar Linnaeus, Salvelinus fontinalis (Mitchell), Melanotaenia fluviatilis (Castelnau), Atherinosoma microstoma (Günther), Macquaria novemaculeata (Steindachner), Nannoperca australis Günther, Pseudaphritis urvillii (Valenciennes), and Hypseleotris spp. (hybridogenetic forms). New records are a combination of greater available information and new incursions, highlighting the need for ongoing detailed surveys and reporting to detect rare native and alien species. Source

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