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Thursday, March 2nd, 2017

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    2:31p
    [Entomology • 2017] The Liriomyza (Diptera: Schizophora: Agromyzidae) of Canada & Alaska

    Liriomyza blechi  Spencer 


    Abstract

    The Liriomyza (Diptera: Agromyzidae) of Canada and Alaska is revised, with species keyed and illustrated, and new host and geographic records provided. Eighty one species are recognized, including 24 new to science: L. agrios, L. albispina, L. anatolis, L. aphila, L. apilaca, L. aquapolis, L. arenarium, L. atrassimilis, L. bicolumbis, L. charada, L. cracentis, L. elevaster, L. emaciata, L. fumeola, L. gibsoni, L. griffithsi, L. hilairensis, L. limopsis, L. mesocanadensis, L. pilicornis, L. pistilla, L. rigaudensis, L. taraxanox, L. taraxanuda, L. tryssos. Ten species known from the United States are recorded as new to Canada: L. artemisiae Spencer, L. assimilis (Malloch), L. baccharidis Spencer, L. helianthi Spencer, L. merga Lonsdale, L. minor Spencer, L. sabaziae Spencer, L. temperata Spencer, L. violivora (Spencer) and L. virgo (Zetterstedt). Palaearctic species new to North America include L. wachtli Hendel and L. flaveola (Fallén); while the latter species has been recorded in North America before, all previous records represent misidentifications. Hosts are recorded for the first time for L. balcanicoides Sehgal, L. minor Spencer, L. orilliensis Spencerand L. socialis Spencer. Galiomyza Spencer syn. nov. is included as a junior synonym of Liriomyza Mik, resulting in six new combinations.

    Keywords: Diptera, revision, Nearctic, new species, synonymy, Galiomyza

     Owen Lonsdale. 2017. The Liriomyza (Diptera: Schizophora: Agromyzidae) of Canada & Alaska. Zootaxa. 4234(1); 1–156. DOI:  10.11646/zootaxa.4234.1.1


    11:30p
    [Paleontology • 2017] Mauriciosaurus fernandezi • A New Polycotylid Plesiosaur with Extensive Soft Tissue Preservation from the early Late Cretaceous of northeast Mexico

     Mauriciosaurus fernandezi
    Frey, Mulder, Stinnesbeck, Rivera-Sylva, Padilla-Gutiérrez & González-González, 2017  


    ABSTRACT 
    A nearly complete skeleton of a polycotylid plesiosaur is described from the early Late Cretaceous laminated limestones at Vallecillo, northeast Mexico. It shows extensive soft tissue preservation. In some exceedingly well preserved areas there are transversely elongate rectangular to trapezoid millimetric scale-like structures arranged in longitudinal rows. The trailing edge skin flap preserves fibers and scale rows perpendicular to the trailing edge. A thick layer of subdermal tissue is present, especially along the tail base. It was responsible for the hydrodynamic drop-shaped body contour, with the body and tail forming a single unit. The body shape determined from the preserved soft tissues suggests a swimming speed similar to extant leatherback turtles. Based on the unique osteology of the palate, which is intermediate between Dolichorhynchops and Trinacromerum, and according to the unique morphology of the girdles and propodials as well as the medially converging gastralia, the new specimen is placed in a new genus and species of Polycotylidae, Mauriciosaurus fernandezi gen. et sp. nov. 

    Keywords: Vertebrate palaeontology, Plesiosauria, Polycotylidae, Late Cretaceous, northeast Mexico, soft tissue preservation, palaeoecology.


    Figure 3 : Mauriciosaurus fernandezi  INAH CPC RFG 2544 P.F.1.
     A) Photograph of the specimen after preparation, B) interpretative line drawing. Note the massive tail base and the dorsal skin preserved between the ribs. 

    Systematic paleontology

    Plesiosauria de Blainville, 1835
    Plesiosauroidea Welles, 1943
    Leptocleidia Ketchum and Benson, 2010

    Polycotylidae Williston, 1908

    Mauriciosaurus gen. nov
    Mauriciosaurus fernandezi sp. nov.

    Derivation of name: Genus and species name in honor of Mauricio Fernández Garza, who not only made the specimen accessible for scientific research, but also secures all future work in the quarry area at Vallecillo and supports public education in Earth- and biological sciences predominantly in the state of Nuevo León.




    Eberhard Frey, Eric W.A. Mulder, Wolfgang Stinnesbeck, Héctor E. Rivera-Sylva, José Manuel Padilla-Gutiérrez and Arturo Homero González-González. 2017. A New Polycotylid Plesiosaur with Extensive Soft Tissue Preservation from the early Late Cretaceous of northeast Mexico. Boletín de la Sociedad Geológica Mexicana. 69(1); 87–134.


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