pygidium sentence in Hindi
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- Effacement, the loss of surface detail in the cephalon, pygidium, or the thoracic furrows, is also a common evolutionary trend.
- The former differs from the latter in having spines on both the cephalon and the pygidium, a characteristic unique to the entire genus.
- The thorax and pygidium are very regularly divided into up to 23 rather narrow segments, without a furrow within each of the pleurae.
- Its pygidium has a terminal anus, with two pygidial cirri being laterally inserted, as well as an unpaired appendage that is placed ventrally.
- In arachnids, the pygidium is formed by reduction of the last three opisthosomal segments to rings where there is no distinction between tergites and sternites.
- The pygidium is also very effaced, but the ovate pygidial axis ( or rhachis ) is well defined and a border furrow is also present.
- The Asaphids generally have cephalon ( head ) and pygidium ( tail ) parts similar in size, and most species have a prominent median ventral suture.
- Exigua is only known from the central part of the headshield or cranidium, so free cheeks ( or librigenae ), thorax and pygidium are unknown.
- The thorax is composed of eleven segments, with the relatively large pygidium with a slender axis of 11 to 16 rings and 6 or 7 pleural ribs.
- Its major characteristics are a wide cranidium, heavy eye ridges, longitudinal striae on the pre-glabellar area, and a small pygidium with few segments.
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