Harpacticus furcatus LANG from the Antarctic Peninsula, with Reference to the Copepodid Stages (Copepoda: Harpacticoida)

• Main Authors: 伊藤 立則, 福地 光男, Tatsunori ITO, Mitsuo FUKUCHI
• Format: Report
• Language: English
• Published: 研究論文 1978
• Subjects: 59(26); Antarctic; The Antarctic; Antarctic Peninsula; Seta; Antarc*; Harpacticus
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=7982; http://id.nii.ac.jp/1291/00007982/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=7982&item_no=1&attribute_id=18&file_no=1

Harpacticus furcatus LANGが南極半島西岸にあるアルミランテ・ブラウン基地付近の潮溜りで得られた標本に基づいて再記載された.原記載では雌の第2胸肢内葉第2節に1刺毛のみがあることになっていたが,この標本ではすべて2刺毛を有し,原記載とは明らかに違っていた,しかし,残っていた原著者の標本9個体を再検討したところ,すべて2刺毛を有し,この重要な分類形質において今回報告したものと完全に一致した.すべてのコペポダイト期幼生の形態も記載され図で示されているが,その結果,本種は第2～第4胸腔内葉の外刺棘の形成様式がnon-retarded formation型であることが明らかになった. Harpacticus furcatus LANG is redescribed, based upon some specimens collected in a tide pool near Almirante Brown Station on the west coast of the Antarctic Peninsula. Although the original description by LANG states that the female has only one inner seta on the middle endopodite segment of leg 2, all the females of the present material examined have two setae, and markedly differ from the LANG's description in this respect. All the nine female specimens of the remaining LANG's material, however, have two inner setae on the endopodite segment in question, and completely agree with those of the present material in this important taxonomic character. All the copepodid stages are also described and illustrated. As a result, it is clarified that this species is of the non-retarded formation type in the differentiation process of the endopodal outer spine of the leg 2, leg 3 and leg 4.