Search results for "Cercus"
showing 4 items of 14 documents
Observaciones sobre los dinoflagelados (Pyrrhophyta) de las costas de Castellón (España)
1991
espanolEn este trabajo se presentan 27 especies de dinoflagelados (Pyrrhophyta), procedentes de muestreos realizados durante el otono de 1989, en la zona neritica del Mediterraneo frente al puerto de Castellon (U.T.M. 31S BE451293). Se comentan algunas caracteristicas morfometricas de especies pertenecientes a los generos: Prorocentrum, Amphisolenia, Dinophisis,Ornithocercus, Peridinium,Ceratocorys y Ceratium. La especie Dinophisis schuetti Murray et Whitting, 1899, se cita por primera vez para esta costa. EnglishIn the present work, 27 species of dinoflagellates (Pyrrhophyta) were determinated. The samples were taken in the 1989 autumn in the Mediterranean neritic zone near the harbour of …
Impact of human disturbance and beliefs on the tree agama Acanthocercus atricollis atricollis in a South African communal settlement
2009
We investigated the effects of human disturbance and attitudes on the density of the tree agama Acanthocercus atricollis atricollis in a densely populated rural settlement in South Africa. In this environment agamas live on trees that are harvested for firewood or maintained for fruit production. We conducted visual encounter surveys of A. a. atricollis and interviewed local households to establish whether human attitudes and actions could affect tree agama populations. Although local residents viewed tree agamas negatively (50% of interviewees claimed to have killed an agama) and acted to exclude them from their environment, tree agama density in villages was higher than that of adjacent c…
Sinophysis and Pseudophalacroma are Distantly Related to Typical Dinophysoid Dinoflagellates (Dinophysales, Dinophyceae)
2011
Dinophysoid dinoflagellates are usually considered a large monophyletic group. Large subunit and small subunit (SSU) rDNA phylogenies suggest a basal position for Amphisoleniaceae (Amphisolenia,Triposolenia) with respect to two sister groups, one containing most Phalacroma species plus Oxyphysis and the other Dinophysis,Ornithocercus, Dinophysoid dinoflagellates are usually considered a large monophyletic group. Large subunit and small subunit (SSU) rDNA phylogenies suggest a basal position for Amphisoleniaceae (Amphisolenia,Triposolenia) with respect to two sister groups, one containing most Phalacroma species plus Oxyphysis and the other Dinophysis,Ornithocercus, Histioneis,Citharistes an…
The fine structure of colleterial glands in two cockroaches and three termites, including a detailed study of Cryptocercus punctulatus (Blattaria, Cr…
2007
1873-5495 (Electronic) Journal Article Research Support, U.S. Gov't, Non-P.H.S.; The colleterial glands of insects are organs associated with the female genital apparatus. In cockroaches, these glands produce secretions that cover two parallel rows of eggs during oviposition, and in oviparous species, these secretions become the tanned, sculpted, rigid outer casing of the ootheca. The goal of this study was to compare the gross anatomy of the colleterial glands and the ultrastructure of their component tubules in the phylogenetically significant genera Cryptocercus (Blattaria) and Mastotermes (Isoptera). Recent studies indicate that cockroaches in the genus Cryptocercus are the sister group…