Phylum Loricefera || Marine animals || Body form || Nervous system || Reproductive system || Zoology скачать в хорошем качестве

Phylum Loricefera || Marine animals || Body form || Nervous system || Reproductive system || Zoology

#Phylum_loricefera #loricefera #lorica #marine #marineanimals #bsczoology #kingdomanimalia #ppsc #fscbiology #phylum #neetbiology #neet2023 #neetpreparation #neetzoology #ppsczoology #ppscpreparation #zoologist #zoologylecturesforneet Loricifera (from Latin, lorica, corselet (armour) + ferre, to bear) is a phylum of very small to microscopic marine cycloneuralian sediment-dwelling animals with 43 described species and approximately 100 more that have been collected and not yet described.Their sizes range from 100 μm to ca. 1 mm. They are characterised by a protective outer case called a lorica and their habitat is in the spaces between marine gravel to which they attach themselves. The phylum was discovered in 1983 by R.M. Kristensen, near Roscoff, France.[6] They are among the most recently discovered groups of animals. They attach themselves quite firmly to the substrate, and hence remained undiscovered for so long.The first specimen was collected in the 1970s, and described in 1983. They are found at all depths, in different sediment types, and in all latitudes. The animals have a head, mouth, and digestive system, as well as the lorica. The head (which contains the mouth and the brain), a trunk region surrounded by six plates that make up the 'lorica' or corselet and – in between these two – the neck region. Loricifera have a well developed brain and each scalid is individually connected to the brain by nerves. The armor-like lorica consists of a protective external shell or case of encircling plicae.[9] There is no circulatory system and no endocrine system. Many of the larvae are acoelomate, with some adults being pseudocoelomate, and some remaining acoelomate.[7] Development is generally direct, though there are so-called Higgins larvae, which differ from adults in several respects. As adults, the animals are gonochoric. Very complex and plastic life cycles of pliciloricids include also paedogenetic stages with different forms of parthenogenetic reproduction. Fossils have been dated to the late Cambrian.    • Phylum Nematomorpha || Horse Hair Worms  |...      • Phylum Acanthocephala || Thorny headed wor...      • Phylum Nematoda | Round worms 🪱 | Aschelmi...