Robustocheles occulta sp.n., a new troglobitic mite (Acari: Prostigmata: Rhagidiidae) from North American caves

1988 ◽  
Vol 66 (3) ◽  
pp. 646-650 ◽  
Author(s):  
Miloslav Zacharda ◽  
Chris W. Pugsley
Keyword(s):  
Geographic Distribution ◽  
North American

A troglobitic rhagidiid mite Robustocheles (Lewia) occulta sp.n. is described from three North American caves in Alberta, Washington, and Iowa. A subglacial refugium hypothesis is discussed in light of the unusual geographic distribution of this species.

A new vauxiid sponge from the Kaili Biota (Cambrian Stage 5), Guizhou, South China

2017 ◽  
Vol 154 (6) ◽  
pp. 1334-1343 ◽  
Author(s):  
XINGLIAN YANG ◽  
YUANLONG ZHAO ◽  
LOREN E. BABCOCK ◽  
JIN PENG
Keyword(s):  
Geographic Distribution ◽  
South China ◽  
North American ◽  
Evolutionary History ◽  
Burgess Shale ◽  
The Family ◽  
History Of ◽  
Morphological Differences ◽  
North Greenland

AbstractThe skeleton of a new vauxiid sponge (Order Verongida), Angulosuspongia sinensis gen. et sp. nov., described on the basis of material from calcareous mudstones of the Kaili Formation (Cambrian Stage 5), Jianhe area, Guizhou, South China, is composed of two layers of fused spicules outlining hexagonal or polygonal openings. These vauxiid remains are the first reported from outside Laurentia, and represent only the second genus attributed to the family. Its age is close to but still slightly older than the Burgess Shale Biota, and it appears to be a primitive relative of other members of the Vauxiidae. The morphological differences between Chinese and Laurentian vauxiid sponges may be a result of vicariance. These specimens not only extend the geographic distribution of vauxiids, but also help to fill a chronostratigraphical gap between North Greenland and North American material and provide additional evidence for understanding the evolutionary history of the Demospongiae.

Craniodental morphology and diet ofLeptarctus oregonensis(Mammalia, Carnivora, Mustelidae) from the Mascall Formation (Miocene) of central Oregon

2017 ◽  
Vol 92 (2) ◽  
pp. 289-304 ◽  
Author(s):  
Jonathan J. Calede ◽  
Winifred A. Kehl ◽  
Edward B. Davis
Keyword(s):  
Sexual Dimorphism ◽  
North America ◽  
Intraspecific Variation ◽  
Geographic Distribution ◽  
North American ◽  
Distinct Species ◽  
Land Mammal ◽  
Distinct Morphology

AbstractThe Leptarctinae are an enigmatic subfamily of mustelids present in North America and Eurasia during the Miocene (Arikareean to Hemphillian North American Land Mammal Ages). Their diet and ecology have been particularly controversial. Some workers have suggested they were similar to koalas, whereas others suggested they were crushing omnivores analogous to raccoons.Leptarctus oregonensisStock, 1930, a poorly known leptarctine from the early Barstovian, is represented by fragmented cranial elements and isolated teeth from the Mascall Formation of Oregon, and some fairly complete but undescribed material from the Olcott Formation of western Nebraska. Herein, we describe the first well-preserved skull ofL.oregonensisfrom the type formation. Based on this new specimen, we confirm thatL.oregonensisis a distinct species fromL.primusLeidy, 1856 andL.ancipidensWhite, 1941 that is characterized by a distinct morphology of its tympanic projections and first upper molars. We are also able to describe intraspecific variation withinL.oregonensiscoinciding with the geographic distribution of the specimens (Oregon and Nebraska). The most variable characters are concentrated in the morphology of the frontals and the upper fourth premolar. Additional specimens will be needed to settle the debate over sexual dimorphism in this species, but this new specimen suggests thatLeptarctus oregonensis, despite being one of the smallest members of the Leptarctinae, was an animal-dominated omnivore with considerable crushing ability.

Polymorphism in Languria taedata LeConte, its occurrence in coastal Louisiana Spartina marshes, and clarification of some Motschulsky languriine types (Coleoptera: Erotylidae: Languriinae)

Zootaxa ◽  
2012 ◽  
Vol 3237 (1) ◽  
pp. 24 ◽  
Author(s):  
MATTHEW L. GIMMEL ◽  
CHRISTOPHER E. CARLTON ◽  
WILLIAM H. WHITE
Keyword(s):  
North America ◽  
Geographical Distribution ◽  
Spartina Alterniflora ◽  
Geographic Distribution ◽  
North American ◽  
Gulf Coast ◽  
Coastal Species ◽  
Coastal Louisiana ◽  
New Synonymy ◽  
Range Of Variation

We clarify the diagnosis and geographic distribution of the widespread, variable eastern coastal species Languria taedataLeConte, 1854, in North America. After examining types and the range of variation and geographical distribution of thespecies, we propose synonymy of L. erythrocephalus Blatchley, 1924, with L. taedata, new synonymy. We report the dis-covery of an all-piceous form (“Form C”), the first of the genus, found primarily along the western Gulf Coast of the Unit-ed States. The recognition of this form requires a modification to the most recent key to North American genera ofLanguriinae. The larvae of L. taedata feed within the stems of Spartina alterniflora Loisel (Poaceae). We provide addi-tional notes on the occurrence of L. taedata in coastal marshes in Louisiana. The types of L. apicalis Motschulsky, L. ni-griceps Motschulsky, L. obscura Motschulsky, and L. rufiventris are reexamined. A revised synonymic checklist is provided for North American Languriini.

THE COMPARATIVE BIOLOGY AND MORPHOLOGY OF TAENIA OVIS AND TAENIA KRABBEI, WITH OBSERVATIONS ON THE DEVELOPMENT OF T. OVIS IN DOMESTIC SHEEP

1962 ◽  
Vol 40 (7) ◽  
pp. 1287-1311 ◽  
Author(s):  
G. K. Sweatman ◽  
T. C. Henshall
Keyword(s):  
Skeletal Muscle ◽  
Muscle Tissue ◽  
Geographic Distribution ◽  
North American ◽  
Host Response ◽  
Domestic Sheep ◽  
Comparative Biology ◽  
Rostellar Hook ◽  
Body System ◽  
Body Area

The geographic distribution of infections of skeletal muscle and cardiac cysticerci, possibly T. krabbei, in North American Cervidae is related where pertinent to the geographic distribution of T. ovis in domestic sheep. Experiments show that T. krabbei and T. ovis are biologically distinct but morphologically indistinguishable.The T. ovis embryo migrates through the muscle tissue forming a streak when only a few days old. Where the host response is not inhibitory, complete differentiation and rostellar hook development occur about 56 days after exposure. Many parasites are destroyed by the host as differentiating embryos, before rostellar hooks have begun to develop, during hook development, but only rarely after the cyst is differentiated completely. Viable cysts are surrounded by only a thin fibrous wall. Dead and viable cysts occur non-systematically and show no relationship to any particular muscles, body area, or body system.

COCCIDIA (PROTOZOA: EIMERIIDAE) OF NORTH AMERICAN WILD GEESE AND SWANS

1957 ◽  
Vol 35 (6) ◽  
pp. 715-733 ◽  
Author(s):  
Harold C. Hanson ◽  
Norman D. Levine ◽  
Virginia Ivens
Keyword(s):  
United States ◽  
Geographic Distribution ◽  
North American ◽  
The United States ◽  
Branta Canadensis ◽  
Anser Albifrons ◽  
Eimeria Anseris

In a survey of the coccidia of 362 wild geese and swans from Canada and the United States, including subspecies and populations of Anser albifrons, A. caerulescens, A. rossi, Branta canadensis, B. bernicla, and Olor columbianus, the following coccidia were found: Eimeria anseris, E. brantae, E. fulva, E. hermani, E. magnalabia (syn., E. striata), E. nocens, E. truncata, E. clarkei n. sp., E. farri n. sp., and Tyzzeria anseris. Reports in the literature on the species of coccidia occurring in wild and domestic geese and their prevalence and geographic distribution are summarized with particular reference to North American flyways.

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