pygidial การใช้
- Its pygidium has a terminal anus and two pygidial cirri.
- Older individuals also tend to have proportionally wider anterior ends of the pygidial axial lobe.
- These trilobites have eleven thoracic segments, a very small pygidia and long genal and pygidial spines.
- The third pygidial axial lobe is longer than half the length of the second pygidial axial lobe.
- The third pygidial axial lobe is longer than half the length of the second pygidial axial lobe.
- The pygidial axis ( or rachis ) is pointed ( or acute ), ending at the border.
- They are known to release a sex pheromone from the pygidial gland, an exocrine gland found between the last two abdominal segments.
- The pygidial axis has 9 to 11 rings, and the pleural areas to the sides have 5 to 8 pairs of recognizable ribs.
- They are known for swimming by emitting pygidial gland secretions that reduce surface tension and allow them to move on the surface of water.
- Its pygidium has a terminal anus, with two pygidial cirri being laterally inserted, as well as an unpaired appendage that is placed ventrally.
- The pygidium is also very effaced, but the ovate pygidial axis ( or rhachis ) is well defined and a border furrow is also present.
- The researchers took the Dufour s, pygidial, and poison glands from freshly mated " Polyergus " queens, using water as a negative control.
- Bombardier beetles have well-developed, like other carabid beetles, pygidial glands that empty from the lateral edges of the intersegment membranes between the seventh and eighth abdominal segments.
- While Bombardier beetles have well developed, like other carabid beetles, pygidial glands that empty from the lateral edges of the intersegment membranes between the seventh and eighth abdominal segments.
- The secretions differ in the chemical constituents, according to the taxa . prothoracic glands secreting steroids; and the Gyrinidae are unique in the extended shape of the external opening of the pygidial gland.
- Their pygidial glands can produce explosive secretions, giving them the other name of "'flanged bombardier beetles "'although they are not particularly close relatives of the typical bombardier beetles ( Brachininae ).
- The Australian paleontologist James B . Jago, however, questioned Palmer's diagnoses in 1973, noting that the differences in the lengths of the pygidial axial lobes used by Palmer to separate the subspecies, depended on minute differences.
- The pygidial axis ( or rhachis ) is times as long as the pygidium, almost parallel-sided, very slightly constricted at the middle lobe ( M2 ), broadly rounded, and times as long as wide.
- The articulating middle part of the body has 12 segments and the tailshield carries two long, tubular, curved pygidial spines that are reminiscent of earwig's pincers that rise backwards from the plain of the body at approximately 30?
- Its major characteristics are a large parallel-sided glabella, deep interpleural furrows on the pygidium, and slender pygidial spines, as well as the fact that it is the most common limb-bearing trilobite species in the Burgess Shale.
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