(2) four-axis spicules (tetraxons), also known as the four put spicules (quadriradiate), bone needles on a plane four radiology end, but often lost some radiation end into three put two put or put a type three put bone needle is the the the calcareous sponges Gang animal in the most ordinary kind of bone; (3) the triaxial spicules (triaxons), its three axes at right angles to each other heal, thus was six discharge type (hexactinal), this is also often reduced end to change the playback count, its distal end can be bent, branched, or with Jun, a statement of changes in a variety of forms; (4) the multiaxial spicules (polyaxons) from the center outwardly more shot, formation and star of this type is more common in small spicules. Different species of sponges, various bone pin or mutual separation, or by a certain configuration to form a loose or a solid grid to support the body, it can be based on the type, number and arrangement of the bone needle and as the basis of the classification of the sponges. Sponge wire is a fibrous skeleton, which is composed by the hard protein (scleroprotein) them or separately present in the body wall of the sponges, or coexist with siliceous spicules. The many small siliceous spicules buried sponge yarn was formed effectively support. Many large groups the sponge often at the same time there are these two bones.
Translated by Google
No. 2
多孔动物门
多孔动物门
Spicules component or consisting of calcium carbonate, calcium spicules, or composition by SiO2 · nH2O siliceous spicules, which also may include a trace amount of copper, magnesium, zinc and other ions. Spicules can be divided according to their size the big bone the needle (megasclere), constitute the skeleton of support for the body; and the small bone the needle (microsclere), scattered in the middle lamella, in order to support the body wall of the pipe section. Small spicules exist only in the siliceous sponges. Spicules from the morphology can be divided into a variety of common: (1) uniaxial the spicules (monaxons), i.e. along an axis growth to form a bone pin, axis, or straight or curved, the ends of the shaft or similar or dissimilar, end or tip or other changes; (2) four-axis spicules (tetraxons), also known as the four put spicules (quadriradiate), bone needles on a plane four radiology end, but often lost some radiation end into three put two put or put a type three put bone needle is the the the calcareous sponges Gang animal in the most ordinary kind of bone;
Translated by Google
Porous animal phyla (fossil)
多孔动物门（化石）
多孔动物门（化石）
多孔动物门（化石）
duokong dongwu men (huashi) Porous animal phyla (fossil) Animals also called porous sponges, which are secreted by osteoblasts sponge spicules can be saved as fossils. Sponge skeleton is mainly composed of small siliceous or calcareous spicules of bone and fibrous silk, silk or bone spicules these regular or irregular shape each other barricaded scene sponge skeleton. Spicules varied shapes, sizes can be divided into two equations, usually there are several types: ① uniaxial type, ② axis type, ③ three-axis type, ④ axis type, ⑤ axis nodule type, ⑥ multi-axis type ( Figure sponge spicules type). Spicules dispersed or constitute a skeleton to save a certain shape, often in the form of fossil sedimentary strata. Sponge first appeared in the Precambrian (about 600 million years ago), they experienced after long years continued to the present. Contemporary marine lakes can be found in different types of sponges (eg wool pots, grow old in the same hole, Calamagrostis referral, bath sponges and Ma sponges, etc). In the formation of different periods of history can be found in scattered outcrops of fossil sponge spicules or shaped sponge skeletons. When a large gathering sponges within the formation is an ancient reef sponges. The ages of the Chinese stratigraphic range, basically contain sponge fossils, especially sponge reefs can be formed within the Permian strata. (Deng accounted ball)
calcispongea