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10 results for “Faunal province”
Data from: Late Ordovician and Early Silurian virgianid and stricklandioid brachiopods from North Greenland: Implications for a warm-water faunal province
<p>An unusually rich and diverse suite of virgianid brachiopods, hitherto poorly known, are systematically described here for the first time from the Ordovician–Silurian boundary interval (late Katian–Aeronian) of North Greenland. The Late Ordovician virgianids comprise typical taxa of the warm-water <em>Tcherskidium</em> fauna (e.g. <em>Tcherskidium tenuicostatum</em>, <em>Proconchidium schleyi</em>, <em>Holorhynchus giganteus</em>, and <em>Deloprosopus dawesi</em> sp. nov.). Among the early Silurian taxa, <em>Virgiana hursti </em>sp. nov. occurs as abundant shell beds, similar to other congeneric species in Laurentia, but has somewhat larger internal skeletal structures, albeit not as extravagantly developed as in the late Katian virgianids; <em>Boraeloides balderi</em> gen. et sp. nov. shows extreme thickening of shell wall and internal structures, approaching the extravagant calcification of Katian virgianids. The highly distinct mid-Aeronian stricklandioid brachiopod genus, <em>Kulumbella</em>, characterized by a shell with criss-cross (divaricate) ribbing, also occurs in North Greenland, represented by <em>K. heimdalli</em> sp. nov., which has the largest and most strongly biconvex shells for the genus. Palaeogeographically, the Late Ordovician virgianid fauna of Laurentia was highly distinct, confined to the low–mid tropical latitudes north of the palaeoequator. In comparison, the early Silurian (Rhuddanian) <em>Virgiana</em> and some related taxa in Laurentia spanned the tropics of both hemispheres, forming extensive shell beds in carbonate basins, although <em>Borealis</em> and <em>Borealoides </em>gen. nov. remained confined largely to the northern hemisphere, suggesting a certain level of provincialism extending into the earliest Silurian. The unusual abundance and richness of the virgianid faunas in North Greenland is likely explained by a palaeoecological preference for warm-water carbonate settings.</p>
Data from: Late Ordovician and Early Silurian virgianid and stricklandioid brachiopods from North Greenland: Implications for a warm-water faunal province
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Data from: Fish faunal provinces of the conterminous United States of America reflect historical geography and familial composition
Although the conterminous USA has a long history of ichthyological exploration, the description of biogeographical provinces has been ad hoc. In this study we quantitatively determined fish faunal provinces and interpreted them in the context of the geological history of North America. We also evaluated influences of major river basin occupancy and contemporary environmental factors on provincial patterns. Our data set comprised 794 native fishes, which we used to generate a presence and absence matrix for U.S. Geological Survey (USGS) four-digit hydrologic units. Three nested data sets were analysed separately: primary freshwater families, continental freshwater families (including primary and secondary families) and all freshwater families (including primary, secondary and peripheral families). We used clustering analysis to delimit faunal breaks and one-way analysis of similarity (ANOSIM) to determine significance among clusters (i.e. provinces). We used an indicator-species analysis to identify species that contributed most to province delineations and a similarity-percentage (SIMPER) analysis to describe the relative influence of representatives from each category (i.e. primary, secondary, peripheral) on provincial boundaries. Lastly, we used a parsimony redundancy analysis to determine the roles of historical (i.e. major river basin) and contemporary environmental factors in shaping provinces. Analysis of the nested data sets revealed lessening provincial structure with inclusion of more families. There were 10 primary freshwater provinces, 9 continental freshwater provinces and 7 all freshwater provinces. Major basin occupancy, but not contemporary environmental factors, explained substantial variance in faunal similarities among provinces. However, provincial boundaries did not conform strictly to modern river basins, but reflected river-drainage connections of the Quaternary. Provinces represent broad-scale patterns of endemism and provide a starting point for future studies. Relative malleability of province boundaries in the continental interior highlights this region as biogeographically diverse and dynamic. Interior-core provinces of this region (Central Gulf Coastal Plains, Northern Interior) have not been recognized previously and warrant further study.
Figs. 2–10 in Studies on the Genus Trachys Fabricius from China (4)-A Faunal Survey of Jiangxi Province and Descriptions of Two New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini)
Figs. 2–10. New species of Trachys, holotypes. T. jinpenshanensis, new species, male: 2) Dorsal view; 3) Lateral view; 4) Ventral view; 5) Head-frontal view; 6) Aedeagus. T. parviformis, new species, female: 7) Lateral view; 8) Dorsal view; 9) Ventral view; 10) Head-frontal view.
Figs. 11–14. 11 in Studies on the Genus Trachys Fabricius from China (3)-A Faunal Survey of Hunan Province and Descriptions of Four New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini)
Figs. 11–14. 11) Trachys latiquadratus, new species, aedeagus (fully dissected). 12–14) T. scapuliformis, new species, holotype, female: 12) Dorsal view; 13) Lateral view; 14) Ventral view.
Figs. 2–10 in Studies on the Genus Trachys Fabricius from China (3)-A Faunal Survey of Hunan Province and Descriptions of Four New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini)
Figs. 2–10. Holotypes of new species of Trachys. 2–4) T. chalingensis, new species, holotype, female: 2) Dorsal view; 3) Lateral view; 4) Ventral view. 5–7) T. cylindricus, new species, holotype, female: 5) Dorsal view; 6) Lateral view; 7) Ventral view. 8–11) T. latiquadratus, new species, holotype, male: 8) Dorsal view; 9) Lateral view; 10) Ventral view.
Data from: Fish faunal provinces of the conterminous United States of America reflect historical geography and familial composition
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Data from: Biotic invasion, niche stability, and the assembly of regional biotas in deep time: comparison between faunal provinces
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Fig. 1 in Studies on the Genus Trachys Fabricius from China (4)-A Faunal Survey of Jiangxi Province and Descriptions of Two New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini)
Fig. 1. Collecting localities selected for survey of Trachys in Jiangxi Province, China.
Fig. 1 in Studies on the Genus Trachys Fabricius from China (3)-A Faunal Survey of Hunan Province and Descriptions of Four New Species (Coleoptera: Buprestidae: Agrilinae: Tracheini)
Fig. 1. Collecting localities selected for survey of Trachys in Hunan Province, China.
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