A rotifer of the family Rotifidae. It is commonly found as plankton in lakes and ponds, but also appears in brackish waters. It is common in summer. It has an inverted cone shape with a body length of 0.2 to 0.3 mm, which is slightly wider in the middle and tapers toward the rear. The head is bulging in the center, with a pair of setae on both ends, and a pair of dark red eyespots in between. There are ear-like protrusions below the setae, and the cilia on these parts hang down. The lateral tentacles are located in the rear third of the body. The distinction between the body and legs is unclear, and the legs gradually taper into two small toes at the end. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ドロワムシ科の輪形動物。湖沼や池のプランクトンとしてふつうに見られるが,汽水域にも出現する。夏に多い。体長0.2~0.3mmの倒円錐形で,中央部がやや広くなって後方になるに従って細くなる。頭盤の中央が膨らみ,左右両端に1対の剛毛があり,その中間に1対の暗赤色の眼点がある。剛毛の下方には耳のような突出部があり,その部分に生ずる繊毛は下方へたれ下がっている。側方触毛は体の後方の1/3のところにある。体と足との区別ははっきりせず,しだいに細くなって末端は小さい2本の趾になっている。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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