1,721,077 research outputs found
Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea
No full textBrunetti, R., Mastrototaro, F. (2012): Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea. Zootaxa 3258 (1): 28-36, DOI: 10.11646/zootaxa.3258.1.2, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.3258.1.
FIGURE 6. Botrylloides pizoni n in Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea
No full textFIGURE 6. Botrylloides pizoni n. sp. a, cross section of a "mammillated" colony; b, enlarged detail from fig a: oa = oral apertures of zooids, cc = cloacal canal. Scale bars: a, 6 mm; b, 500 µm.Published as part of Brunetti, R. & Mastrototaro, F., 2012, Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea, pp. 28-36 in Zootaxa 3258 (1) on page 35, DOI: 10.11646/zootaxa.3258.1.2, http://zenodo.org/record/524926
FIGURE 4. Botrylloides pizoni n in Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea
No full textFIGURE 4. Botrylloides pizoni n. sp. a1, and a2, parietal and mesial sides of intestine; b, swimming larva. Scale bars: a1 and a2, 300 µm; b: 600 µm.Published as part of Brunetti, R. & Mastrototaro, F., 2012, Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea, pp. 28-36 in Zootaxa 3258 (1) on page 33, DOI: 10.11646/zootaxa.3258.1.2, http://zenodo.org/record/524926
Botrylloides pizoni, a new species of Botryllinae (Ascidiacea) from the Mediterranean Sea
No full textA new ascidian species belonging to the Botryllinae was discovered in the Gulf of Taranto (South Italy). This new species was collected in different seasons over a period of several years, which allowed information about its biology to be obtained. The new species presents large zooids arranged in ladder systems. The zooids have several rows of stigmata, the second one complete, ovary posterior to testis, one larva per side developing in an incubatory pouch, and a peculiar arrangement of the gut loop. The new species is named Botrylloides pizoni after the great French zoologist Antoine Pizon (1860-1942). Copyright © 2012 Magnolia Press
Biometric relationships in the red sea pen Pennatula rubra (Cnidaria: Pennatulacea)
Full text linkColonies of the red sea pen Pennatula rubra sampled by trawling in the northwestern Mediterranean Sea were analyzed. Biometric parameters such as total length, rachis length, number of polyp leaves, wet weight and dry weight were measured and related to each other by means of regression analysis. The most reliable measures for future inferencing of colonies size and biomass through visual techniques were individuated in order to allow a noninvasive study of P. rubra population structure and dynamics
What do marine zoologists need from an underwater vehicle?
No full textFuture perspectives in underwater vehicles potential uses and needed features are here presented and discussed through different study cases embracing research, monitoring and exploration, from shallow-water to deep-sea habitats and communities. Essential features asked to the next generation of underwater vehicles include the possibilities to explore deeper depths, observe in detail targeted specimens, use further spectra besides the visible, sample soft-body benthic organisms, move within demanding situations (e.g. obstacles on the seabed), as well as the ability to stably stop on the seabed and collect images in a relative long (e.g. few hours) time spam
A sea of corals in the Mediterranean Sea
No full textThe fortuitous discovery of living colonies of white corals on the unexplored bottoms of Santa Maria di Leuca (Ionian Sea), 18 years ago, represented an unprecedented turning point in the study of the Mediterranean bathyal ecosystems. A long-term explorative and descriptive study program was carried out in this area, also stimulating the search of coral forest ecosystems all over the basin, at all depths, and the carrying out of numerous relevant scientific studies. The deep coral era has started. Nowadays, considering as cold-water corals the habitat-forming azooxanthellate cnidarians, 61 deep coral sites are known in the basin
Distribution and swimming ability of the deep-sea holothuroid Penilpidia ludwigi (Holothuroidea: Elasipodida: Elpidiidae)
No full textThe deep-sea elpidiid holothuroid, Penilpidia ludwigi, was recorded using a Remotely Operated Vehicle in the Western, Central, and Eastern Mediterranean Sea. This species, endemic to the basin, was previously captured above the seabed in sediment traps and based on these records its swimming ability was assumed. The present study reports the first in situ observations of swimming P. ludwigi and provides an update on the geographic and bathymetric distribution of this species. A large aggregation of thousands of specimens was observed in the Levantine Sea with a maximum local density 300 ind. m(-2). The ROV surveys allowed observation of the behavior of the species and description of its mode of swimming. Active swimming using strokes of the tentacle crown is combined with drifting benefiting of the current, the former used for fast escape the latter mainly for energy-saving displacement. Swimming behavior allows P. ludwigi to exploit various deep-sea habitats including seamounts, canyons, and ridges inaccessible to non-swimming deposit feeders
Withdrawal behaviour of the red sea pen pennatula rubra (Cnidaria: Pennatulacea)
No full textAggregations of sea pens are important soft-bottom communities providing a three-dimensional complexity from which several associated species can benefit. The red sea pen Pennatula rubra is one of the Mediterranean coastal field-forming sea pens able to establish dense aggregations on the sandy/muddy bottoms of the infra-and circumlittoral zones. This species was first described at the end of the 17th century, but since then little information has been published about its biology, ecology and biogeography. Even less is known about its behaviour, its reactions after disturbance and its possible escape strategies. Several species of pennatulaceans can withdraw partially or completely into the sediment, usually in a fast (i.e. a few seconds) process of polyp closure and expulsion of part of the water contained within the colony. The present study reports and discusses the withdrawal behaviour of P. rubra after disturbance. This behaviour has never been documented before in this species. It proved to be a slow process requiring between 210 and 340 seconds (3 min 30 sec to 5 min 40 sec) for the complete withdrawal. Moreover, a soft bioluminescence was observed in two undisturbed colonies in the study area, while two other colonies were found to be out of the sediment, inflating themselves with seawater and getting carried by currents as a sort of dispersal behaviour
- …
