Search results for "Hoya"
showing 6 items of 6 documents
The taxonomy ofOreosparte(Apocynaceae: Asclepiadoideae)
2013
Oreosparte is a monotypic genus described as bearing strong similarities to Hoya (Marsdenieae), but separated from it based on the presence of a campanulate corolla with a contracted throat and lanceolate, spreading lobes. Its type specimen was destroyed during the fire at the Berlin herbarium in 1943. So far no suitable lectotype or further specimens belonging to the taxon were located. We report the finding of one specimen of Oreosparte collected from the type locality, allowing the selection of a neotype, to provide an extended description, and discussion of the morphological affinities with Hoya. Based on its morphology, despite being probably closely related to Hoya, we suggest that Or…
Preparation protocols for SEM visualization of charred fossil plants: the case of Weichselia reticulata pinnule anatomy
2021
The cosmopolite Mesozoic fern Weichselia reticulata presents many peculiarities in the anatomy of its stem as well as in the architecture of its leaves. Previous analyses of the ultrastructure of their pinnule laminas provided some insight on xeromorphic traits. In this work new protocols for the preparation of charred compression foliage specimens embedded in a limestone matrix for their observation under SEM are presented, which enhance the observation of different plant tissues. The preparation with HCl allows for the visualization of the whole lamina, from the upper to the lower epidermis, which had not been done to date. Additionally, collodion, latex, or wax coverings of the fossils b…
Observations on ant-plant interactions in Pachycentria and other genera of the Dissochaeteae (Melastomataceae) in Sabah and Sarawak
1998
Summary In Sabah and Sarawak (Malaysia) ant-plant interactions of Dissochaeteae were studied in the field. Whereas some species of Dissochaeteae show only loose and fortuitous interactions with ants as the result of the provision of pearl bodies and nesting places which are used by ants facultatively, Pachycentria constricta and P. glauca show a complex relationship with ants mediated by other ant plants. Both species provide pearl bodies and potential nesting space or shelter for ants in dried out and hollow root swellings. The main characteristic which differentiates them from all other Melastomataceae interacting with ants are their particular seeds which are attractive to ants and carri…
Characterization of coelacanth scales from the Early Cretaceous freshwater locality of Las Hoyas, upper Barremian (Cuenca, Spain)
2020
Coelacanths are rare, mostly marine fishes, but the species from the Lower Cretaceous Spanish locality of Las Hoyas (Barremian) is a freshwater form and we know almost nothing about it. The Las Hoyas specimens are very rare and relatively incomplete, but there are still many things we can learn from the isolated skeletons and scales. First, the coelacanth scales were distinguished from other superficially similar scales (i.e., other “amioid” scales). Coelacanth scales are distinguished by the presence of a smooth central surface, a particular pattern of arrangement of concentric growth cessation marks, and mainly a relatively short posterior field with thick elongated ridges. Only a few art…
Paracamelichnum Jumillensisn.ichnogen. n.ichnosp., Upper Miocene Camelidae Ichnites from the Hoya de la Sima site (Murcia, Spain)
2009
In the proximity of Jumilla (Murcia, Spain) there is a site called Hoya de la Sima with mammal footprints dating from the Upper Miocene. This site is an old gypsum quarry where footprints of Hipparion, Pecoripeda, Carnivora, Ursidae, and Proboscidea were discovered. While the site was being cleaned and conditioned after the discovery to protect the prints, Camelidae and other prints were unearthed and are currently being studied. The description of the Camelidae ichnites demonstrates that these belong to a new ichnogenera, produced by the prints of Paracamelus. The grouping of trackways is congruent with the gregariousness of these animals and with the concentration observed in similar site…
Hoya EyeGenius pielietojamība asociētās forijas noteikšanai
2020
Maģistra darbs ir uzrakstīts latviešu valodā uz 54 lapaspusēm. Satur 34 attēlus, 4 pielikumus un 40 atsauces uz literatūras avotiem. Darba mērķis bija izvērtēt digitalizētās asociētās forijas novērtēšanas metodes pielietojamību. Pētījumā piedalījās 40 dalībnieki vecumā 19-28 gadi. Darbā tika analizēti un salīdzināti asociētās forijas mērījumi, iegūtie ar dažādiem testiem – digitalizētiem un drukātiem. Pētījumā tika noteikts, ka Hoya EyeGenius Mallett testa rezultāti ir salīdzināmi ar STOP testa rezultātiem, bet ir atšķirīgi no Hoya EyeGenius aprēķina metodes testa un Wesson kartes.