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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Chamaesipho brunnea ： ウィキペディア英語版 Chamaesipho brunnea ''Chamaesipho brunnea'' is an intertidal barnacle common in New Zealand, on North Island and South Island north of Stewart Island. Juveniles have six shell wall plates, reducing to four in adults, and with age, all plates become concrescent, with no trace of sutures inside or out. Shell is brown colored. The related, and sometimes associated ''Chamaesipho columna'' is much smaller in size, by nearly half, while ''Elminius'', which can associate with both species, also has four shell wall plates, but plates remain distinct at all stages. The shell of ''C. columna'' corrodes to a pitted surface, while that of ''C. brunnea'' has a lamellar corrosion. ==Diagnosis and discussion== The shell in non-crowded specimens of ''Chamaesipho brunnea'' is usually low conic, brown with prominent growth ridges basally, corroded upper sections are whiter and smoother. Crowded individuals become columnar. Shell wall in juveniles, to 4 mm maximum diameter consists of six plates, which then reduce to four by fusion of carinolatera with rostrolatera. Complete fusion of wall is accomplished by reproductive maturity, 5-6 mm diameter. No trace of plate sutures is visible inside or outside of shell. Adult shell plates are thick. Maximum size is about 19 mm rostrocarinal diameter, with aperture about 10 mm.〔 The scutum is wider than high, and distinguished by its comparatively large, rectangular articular ridge. The interior shows a smooth surface, with clearly defined shallow or deep adductor pit and shallow lateral depressor pit. Scutal adductor ridge, a character of the genus, is nearly absent, or poorly expressed.〔 The tergum is trapezoidal, with protruding rounded articular ridge. There is no spur, and the interior is featureless except for about 7 prominent crests for the tergal depressor muscle. These crests are visible on the exterior.〔〔 Diagnostic soft part features include a dark brown body with black cirri, and mandible with three, sometimes four teeth. First tooth is separated from rest by large gap. The lower edge bears a row of fine bristles without larger teeth.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chamaesipho brunnea」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.