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Articles 601 - 617 of 617
Full-Text Articles in Biology
Chromosome Counts Of Compositae From The United States And Mexico, Donald J. Pinkava, David J. Keil
Chromosome Counts Of Compositae From The United States And Mexico, Donald J. Pinkava, David J. Keil
Biological Sciences
Chromosome counts are reported for 126 taxa representing 122 species and 61 genera of Compositae. First reports include two genera, Stylocline (n = 14) and Chromolepis (n = 19), 17 species, two infraspecific taxa, and one interspecific hybrid. Five additional taxa have chromosome numbers differing from previously published accounts. Carminatia is reinstated to generic status.
Clematis Coahuilensis (Ranunculaceae), A New Species From North-Central Mexico, David J. Keil
Clematis Coahuilensis (Ranunculaceae), A New Species From North-Central Mexico, David J. Keil
Biological Sciences
Floristic investigations in the Cuatro Cienegas basin and nearby mountain ranges in Coahuila, Mexico, have resulted in the discovery of a previously undescribed species of Clematis (Ranunculaceae). The new species, Clematis coahuilensis, is apparently restricted to the Chihuahuan Desert Region and adjacent segments of the Sierra Madre Oriental. Its known distribution is centered in Coahuila.
Chromosome Studies In North And Central American Species Of Pectis L. (Compositae: Tagetaea), David J. Keil
Chromosome Studies In North And Central American Species Of Pectis L. (Compositae: Tagetaea), David J. Keil
Biological Sciences
Chromosomal modification is often a major factor in the evolutionary diversification of a large, rapidly evolving genus. Pectis, the largest and most widespread genus in the New World tribe Tageteae (Compositae), has radiated into a variety of habitats during its evolutionary history. Until relatively recently, however, little has been known of the role of chromosomal change in the evolution of the genus. Pectis was cytologically unknown until the studies of Raven and Kyhos (1961) and of Turner, Ellison, and King (1961). Subsequently, additional counts have been reported for several taxa (Table 1). To date, however, only a few of …
Revision Of Pectis Section Pectidium (Compositae: Tageteae), David J. Keil
Revision Of Pectis Section Pectidium (Compositae: Tageteae), David J. Keil
Biological Sciences
Pectis L. sect. Pectidium (Less.) A. Gray is a small but very wide-ranging group of taxa. The geographic range of this section includes both insular distribution patterns and broad disjunctions. In an effort to clarify the systematic relationships and to provide a possible explanation for the interesting distribution patterns, I undertook an investigation of this section.
Pectis Humifusa New To The Flora Of The United States, David J. Keil
Pectis Humifusa New To The Flora Of The United States, David J. Keil
Biological Sciences
No abstract provided.
Chromosome Counts Of Compositae From The United States, Mexico, And Guatemala, David J. Keil, Tod F. Stuessy
Chromosome Counts Of Compositae From The United States, Mexico, And Guatemala, David J. Keil, Tod F. Stuessy
Biological Sciences
Chromosome numbers can be extremely useful in systematic studies, particularly for helping to reveal evolutionary relationships. For the past fifteen year numerous chromosome reports from plants have been published, especially in the Compositae, and these counts have been compiled in several major sources (Darlington & Wylie, 1955; Cave, 1958-65; Ornduff, 1967-69; Fedorov, 1969; Moore, 1970-72). However, a rapid glance through these references indicates not only that many species never have been counted, but also that many taxa are known only from a single plant in one population. In view of the common occurrence of euploid and aneuploid races in plants …
Anatomical Specimens From Preserved Animal Discards, Harry L. Fierstine, Myron A. Amerine, Kathleen L. Bek
Anatomical Specimens From Preserved Animal Discards, Harry L. Fierstine, Myron A. Amerine, Kathleen L. Bek
Biological Sciences
No abstract provided.
Xiphiorhynchus Kimblalocki, A New Billfish From The Eocene Of Mississippi With Remarks On The Systematics Of Xiphioid Fishes, Harry L. Fierstine, Shelton P. Applegate
Xiphiorhynchus Kimblalocki, A New Billfish From The Eocene Of Mississippi With Remarks On The Systematics Of Xiphioid Fishes, Harry L. Fierstine, Shelton P. Applegate
Biological Sciences
Xiphiorhynchus kimblalocki, a new species of extinct billfish from the Eocene of Mississippi, is described. This is the first record of Xiphiorhynchus outside of western Europe, and the material consists of a well-preserved rostrum, three partial vertebrae and two fin spine fragments. Xiphiorhynchus kimblalocki is compared with other living and extinct billfish and appears to be intermediate in morphology between the Xiphiidae and Istiophoridae. Various genera of fossil billfish are critically discussed and we suggest that the Blochiidae, Paleorhynchidae, and the "Cylindracanthus-group" should be placed in Xiphioidei lncertae sedis until better evidence indicates that they are billfish. …
New Taxa In Pectis (Compositae: Pectidinae) From Mexico And The Southwestern United States, David J. Keil
New Taxa In Pectis (Compositae: Pectidinae) From Mexico And The Southwestern United States, David J. Keil
Biological Sciences
This paper is the first of a series of investigations on the systematics of Pectis L., the largest genus in the subtribe Pectidinae of the tribe Helenieae. Pectis consists of about one hundred species of annual or perennial, glandular-dotted, yellow-rayed herbs that are widespread in the warmer parts of the New World. In the present report three previously unrecognized taxa from Mexico and the southwestern United States are described as new, and a new combination also is made
Fishes Collected In Morro Bay, California Between January, 1968 And December, 1970, Harry L. Fierstine, Kurt F. Kline, Gregory R. Garman
Fishes Collected In Morro Bay, California Between January, 1968 And December, 1970, Harry L. Fierstine, Kurt F. Kline, Gregory R. Garman
Biological Sciences
Sixty-six species of fish were collected in Morro Bay between January, 1968 and December, 1970. The bay was divided into five ecological zones. Zone I was characterized by sandy beaches with little algae and contained 10 species. Zone II contained 35 species and was characterized by a sandy-silt bottom with some Zostera and kelp beds scattered among commercial piers. Zone III contained 31 species and was characterized by more Zostera beds and fewer commercial developments than Zone II. Zone IV contained 30 species and was characterized by large expanses of shallow Zostera beds dissected by very narrow channels. Zone V …
The Paleontology Of Billfish - The State Of The Art, Harry L. Fierstine
The Paleontology Of Billfish - The State Of The Art, Harry L. Fierstine
Biological Sciences
The major osteological features are described for living billfishes. All billfish remains are reviewed critically and some questionable forms are placed in Xiphioidei Incertae Sedis (uncertain status). The remaining xiphioids are placed into three families: Istiophoridae, Xiphiidae, and Xiphiorhynchidae. A new undescribed xiphiid from Mississippi shows that the billfish lineages must have diverged prior to the Eocene. Areas of research are suggested that will help place the paleontological studies on a more secure foundation.
A Serological Estimate Of Monzygotic Twinning In Sheep, William D. Stansfield
A Serological Estimate Of Monzygotic Twinning In Sheep, William D. Stansfield
Biological Sciences
No abstract provided.
Studies In Locomotion And Anatomy Of Scombroid Fishes, Harry L. Fierstine, Vladimir Walters
Studies In Locomotion And Anatomy Of Scombroid Fishes, Harry L. Fierstine, Vladimir Walters
Biological Sciences
Acceleration rates, analyses of body movements, and pertinent anatomical features are given for various members of the Scombridae, Istiophoridae, and Xiphiidae and are discussed in light of the modern work on smaller freshwater teleosts and marine cetaceans.
Acceleration values up to 43.1 m/sec2 are given for Thunnus albacares and Acanthocybium solanderi. Nearly 100% of the propulsive thrust comes from the caudal fin. There are two main intervertebral joints which are concerned with locomotion, a pre-peduncular and a post-peduncular joint with the body and peduncle held almost stiff, a condition similar to that described for marine cetaceans. The caudal …
Billfish Remains From Southern California With Remarks On The Importance Of The Predentary Bone, Harry L. Fierstine, Shelton P. Applegate
Billfish Remains From Southern California With Remarks On The Importance Of The Predentary Bone, Harry L. Fierstine, Shelton P. Applegate
Biological Sciences
No abstract provided.
Measurements Of Swimming Speeds Of Yellowfin Tuna And Wahoo, Vladimir Walters, Harry L. Fierstine
Measurements Of Swimming Speeds Of Yellowfin Tuna And Wahoo, Vladimir Walters, Harry L. Fierstine
Biological Sciences
No abstract provided.
Another Pacific Record Of The Black Swift Off Mexico, O. Marcus Buchanan, Harry L. Fierstine
Another Pacific Record Of The Black Swift Off Mexico, O. Marcus Buchanan, Harry L. Fierstine
Biological Sciences
No abstract provided.
A New Northern Record Of The Smooth Stargazer, Harry L. Fierstine, Robert G. Werner
A New Northern Record Of The Smooth Stargazer, Harry L. Fierstine, Robert G. Werner
Biological Sciences
No abstract provided.