Cytotaxonomic studies of Draba species in Canada and Alaska: D. oligosperma and D. incerta

1972 ◽  
Vol 50 (8) ◽  
pp. 1763-1766 ◽  
Author(s):  
Gerald A. Mulligan
Keyword(s):  
North America ◽  
Related Species ◽  
Western North America ◽  
Closely Related Species

The cytotaxonomy of two closely related species of Draba, D. oligosperma Hooker (2n = 64) and D. incerta Payson (2n = 112), is discussed and a key is given. Both species are mainly confined to the mountains of western North America, although D. incerta is also disjunct nearly 3000 mi eastward to the tip of Gaspé County in Quebec. Draba oligosperma is an octoploid reproducing mostly by agamospermy and D. incerta is 14-ploid, producing seed by autogamy.

A giant Permian fusulinid from east-central Alaska with comparisons of all giant fusulinids in western North America

1995 ◽  
Vol 69 (5) ◽  
pp. 805-812 ◽  
Author(s):  
Calvin H. Stevens
Keyword(s):  
North America ◽  
Related Species ◽  
The Other ◽  
Lower Permian ◽  
Early Permian ◽  
Western North America ◽  
Closely Related Species ◽  
East Central ◽  
West Texas ◽  
Species Groups

The discovery of a new locality yielding giant Guadalupian (Lower Permian) fusulinids in east-central Alaska extends the range of these forms much farther north than previously known, and into a tectonostratigraphic terrane from which they previously had not been reported. The number of areas from which giant parafusulinids are known in North America is thus raised to eight. Three of these localities are in rocks that previously had been referred to the allochthonous McCloud belt arc, and one, West Texas, is known to have been part of Paleozoic North America. Comparison of species from all areas suggests that there are two closely related species groups: one represented in Texas and Coahuila, and the other represented in Sonora, northern California, northeastern Washington, southern and northern British Columbia, Alaska, and apparently in Texas. These groups may differ because they are of slightly different ages or because interchange between the faunas of Texas–Coahuila area and the other regions was somewhat inhibited during the Early Permian.

Cytotaxonomic studies of Draba species of Canada and Alaska: D. ventosa, D. ruaxes, and D. paysonii

1971 ◽  
Vol 49 (8) ◽  
pp. 1455-1460 ◽  
Author(s):  
Gerald A. Mulligan
Keyword(s):  
North America ◽  
Chromosome Number ◽  
Related Species ◽  
Basic Chromosome Number ◽  
Base Number ◽  
Western North America ◽  
Closely Related Species ◽  
Basic Chromosome ◽  
Hexaploid Species

The cytotaxonomy of three closely related species of Draba, of the mountains of western North America, is discussed and a key is given: D. ventosa A. Gray (2n = 36), D. ruaxes Payson & St. John (2n = ca. 72), and D. paysonii Macbride (2n = 42). Evidence is presented demonstrating that D. ventosa and D. paysonii are triploids reproducing by agamospermy whereas the hexaploid species D. ruaxes is a sexual outcrosser. The former two species produce seed apomictically without any pollen stimulation. Draba ventosa and D. ruaxes have the basic chromosome number x = 12 and D. paysonii has the base number x = 14.

Paleontological Evidence Against a Major Geographic Barrier at about the Paleolatitude of Colorado, USA, during the Late Campanian (Late Cretaceous): The Conspicuous Absence of Endemic Subclades of Chasmosaurine Ceratopsid (Horned) Dinosaurs and Its Significance

2018 ◽  
Vol 55 (1) ◽  
pp. 5-18
Author(s):  
Keith Berry
Keyword(s):  
North America ◽  
Late Cretaceous ◽  
Related Species ◽  
Western North America ◽  
Closely Related Species ◽  
Geographic Barrier

Several paleontologists have suggested that a major geographic barrier at about the paleolatitude of Colorado either prevented or severely restricted biogeographic exchange between the northern and southern regions of western North America during the Late Campanian. However, the origin and nature of this barrier remains enigmatic. In the present study, this hypothesis is tested by determining whether the diversification of Late Campanian chasmosaurine ceratopsid (horned) dinosaurs was affected by the presence of a barrier or, in other words, whether the biogeographic distribution of closely related species was nonrandom with respect to a line of paleolatitude drawn across Colorado. The results of this test indicate that there could not have been a major geographic barrier, which has implications for paleoclimatic and paleogeographic reconstructions of the Colorado region during its early Laramide history.

scholarly journals Intercontinental distributions of species of Cortinarius, subgenus Phlegmacium, associated with Populus in western North America

Botany ◽  
2015 ◽  
Vol 93 (11) ◽  
pp. 711-721 ◽  
Author(s):  
Cathy L. Cripps ◽  
Kare Liimatainen ◽  
Tuula Niskanen ◽  
Bálint Dima ◽  
Richard F. Bishop ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
North America ◽  
Populus Tremuloides ◽  
Related Species ◽  
Its Region ◽  
Deciduous Trees ◽  
Western North America ◽  
Type Specimens ◽  
Closely Related Species ◽  
Salix Spp

Three species of Cortinarius subg. Phlegmacium, Cortinarius argutus Fr. and Cortinarius hedyaromaticus C. Cripps & O.K. Mill. (section Arguti stat. nov.) and Cortinarius talus Fr. (section Multiformes), are compared from western North America and Europe. Phylogenetic analysis of the ITS region shows that C. argutus and C. hedyaromaticus are separate, closely related species with rooting stipes. Cortinarius talus is a pale species with a bulbous stipe and a sweet odor similar to that of C. hedyaromaticus; C. argutus lacks this sweet odor. All three species have intercontinental distributions and are associated with deciduous trees, primarily Populus tremuloides Michx., Populus tremula L., but also Salix spp. This study highlights the importance of the study of type specimens and molecular analysis to stabilize the application of established names.

The Natural Groups of Species in the Genus Ips De Geer (Coleoptera: Scolytidae) in North America

1963 ◽  
Vol 95 (5) ◽  
pp. 508-516 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
North America ◽  
North American ◽  
Related Species ◽  
North American Species ◽  
Closely Related Species ◽  
The North ◽  
The World ◽  
Group Relationships ◽  
Natural Groups

AbstractThe genus Ips is one of four closely related genera in the tribe Ipini, sub-tribe Ipina (De Geer 1775, Balachowsky 1949, Nunberg 1954, Hopping 1963). There are now 32 species of Ips recognized in North America, with a few more as yet undescribed. This paper defines the groups of closely related species with observations on the group relationships of species from other parts of the world. Work is in progress to define the North American species in each group.

Late Cambrian ptychaspidid trilobites from western Utah: implications for trilobite systematics and biostratigraphy

2005 ◽  
Vol 142 (4) ◽  
pp. 377-398 ◽  
Author(s):  
J. M. ADRAIN ◽  
S. R. WESTROP
Keyword(s):  
North America ◽  
Distinct Species ◽  
Western North America ◽  
Closely Related Species ◽  
Widespread Species ◽  
Late Cambrian ◽  
South Central ◽  
New Information ◽  
The Family ◽  
Notch Peak

The Notch Peak Formation (Late Cambrian, Sunwaptan) of western Utah yields diverse silicified trilobite faunas that provide new information on the anatomy of many taxa. The family Ptychaspididae Raymond, 1924, is represented by species of Keithiella Rasetti, 1944; Idiomesus Raymond, 1924; Euptychaspis Ulrich in Bridge, 1931; and Macronoda Lochman, 1964. At least four species are new, of which E. lawsonensis and M. notchpeakensis are named formally. Much previous work on Late Cambrian trilobites has emphasized biostratigraphic utility and the recognition of geographically widespread species. Data from new silicified collections indicate that this approach is difficult to justify because many putative ‘index species’ actually represent a plexus of closely related species whose biostratigraphic significance has yet to be determined. One such plexus is represented by E. kirki Kobayashi, 1935, whose previously reported occurrences in Texas, Oklahoma, Utah, Nevada and northern Canada record at least four distinct species. Similarly, Macronoda can now be shown to consist of at least five late Sunwaptan species in south-central and western North America.

Relocation of Alona manueli Sinev & Zawisza 2013 and a new closely related species from the Ecuadorian Andes to the new genus Alpinalona (Cladocera, Chydoridae, Aloninae)

Zootaxa ◽  
2017 ◽  
Vol 4350 (3) ◽  
pp. 563 ◽  
Author(s):  
MIGUEL ALONSO ◽  
ARTEM Y. SINEV
Keyword(s):  
North America ◽  
South America ◽  
High Altitude ◽  
Related Species ◽  
National Park ◽  
New Genus ◽  
Ventral Surface ◽  
Closely Related Species ◽  
Head Pores ◽  
Lateral Head

Alpinalona gen. nov. is described for two species found in high altitude localities of continental North America and South America: Alona manueli (Sinev & Zawisza, 2013) from the Neovolcanic Mexican Axis and Alpinalona cajasi gen. et sp. nov from El Cajas National Park (Ecuador). The new genus is separated from Hexalona and allies by the absence of limb VI and filter plate V;  from Anthalona, Coronatella and the elegans-group by having seven setae on exopodite III, and by the presence of a well-developed seta 1 on the IDL of limb III; from Alona s. str. (quadrangularis-group) and Ovalona, by two main head pores, lateral head pores located close to main pores, and by a bilobed exopodite V; from Ovalona by the presence of seta (i) and inner setae 2–3 on limb I, and setae 4–5 of exopodite III being of same size; and from Alona s. lato by weakly developed marginal denticles of postabdomen, clusters of thin setulae on ventral surface of limb I, and by plumose setae 5–6 of exopodite IV. Alpinalona cajasi sp. nov. can be easily distinguished from A. manueli by the following characteristics: prominent posterodorsal angle of carapace; broader headshield; longer PP distance; and postanal marginal denticles organized into groups.  

SEX ATTRACTANT BLENDS FOR STRAWBERRY CUTWORM, AMPHIPOEA INTEROCEANICA (SMITH), AND A CLOSELY RELATED SPECIES, AMPHIPOEA AMERICANA (SPEYER) (LEPIDOPTERA: NOCTUIDAE)

1987 ◽  
Vol 119 (3) ◽  
pp. 301-303
Author(s):  
D.L. Struble ◽  
G.L. Ayre ◽  
J.R. Byers
Keyword(s):  
North America ◽  
Convenient Method ◽  
Related Species ◽  
Sex Pheromones ◽  
Sex Attractant ◽  
Similar Species ◽  
Closely Related Species ◽  
Tetradecenyl Acetate ◽  
Important Pest ◽  
Lepidoptera Noctuidae

The strawberry cutworm, Amphipoea interoceanica (Smith), has recently become an important pest of strawberry plants in Manitoba (Ayre 1980) and Quebec (Mailloux and Bostanian 1985). Larvae damage or kill the plants and commercial plantings are sometimes heavily damaged. Strawberry cutworm is widely distributed in North America and is broadly sympatric with a morphologically similar species, Amphipoea americana (Speyer) (Forbes 1954), which is occasionally a pest of corn (Gibson 1920). Sex pheromones of these species have not been reported, although Roelofs and Comeau (1971) found that males of strawberry cutworm were attracted to (Z)-9-tetradecenyl acetate (abbrev. Z9- 14:Ac). A sex attractant for strawberry cutworm would provide a convenient method for monitoring population levels in the vicinity of strawberry fields.

Two New Species of Ips De Geer (Coleoptera: Scolytidae) from Western Canada and Alaska

1963 ◽  
Vol 95 (2) ◽  
pp. 213-217 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
New Species ◽  
North America ◽  
Related Species ◽  
Western Canada ◽  
Closely Related Species ◽  
Two New Species

The two species described here were discovered during studies on a revision of the Ips of North America. They belong to a group of closely related species composed of Ips tridens (Mann.), I. engelmanni Sw., I. yoboensis Sw., I. pilifrons Sw. and I. sulcifrons Wood. The females in this group have the lower part of the front of the head slightly elevated as in I. yohoensis to very strongly protuberant as in I. tridens. All of them breed in species of spruce. The males of this group are difficult to determine from external characters alone. Descriptions were made under a magnification of 50X, using 100X occasionally.

Sign in / Sign up

Export Citation Format

Share Document