関連する実験動画
Updated: Sep 10, 2025

08:02
Dissection and Flat-mounting of the Threespine Stickleback Branchial Skeleton
Published on: May 7, 2016
9.9K
クリノイド・セイロクリヌスの茎の微細な構造は,その擬似プランクトンの生活様式を支えている
Przemysław Gorzelak1, Katarzyna Janiszewska2, İzzet Hoşgör3
1Institute of Paleobiology, Polish Academy of Sciences, Twarda 51/55, 00- 818, Warsaw, Poland. pgorzelak@twarda.pan.pl.
Scientific reports
|August 26, 2025
まとめ
セイロクリヌス (Seirocrinus) の茎の微細構造は,シドプランクトン型のクリノイドに似ていますが,体重を減らすための適応が特徴です. これは古代の海洋動物が 漂流木の生息地に影響を 及ぼさなかったことを示しています
科学分野:
- 古生物学
- 海洋生物学
- バイオミネラル化
背景:
- 漂流木のような浮遊物体に付着し, ベンティックから擬似プランクトンへと進化した.
- セイロクリヌスは,シドプランクトン型クリノイドの重要な例であり,以前の研究は生態学と形態学に焦点を当てていたが,骨格の微細構造ではなかった.
研究 の 目的:
- セイロクリヌス茎のステレオームの微細構造と内部構造を調査する
- 茎の微細構造を 既存の地下層のクライノイドと 比較するためです
- 微細構造の適応がシドプランクトンの重量と生態系にどのように影響したかを理解する.
主な方法:
- セイロクリヌス茎のステレオームの微細構造の分析
- 内部の骨格構造を調べる
- 微細構造パターンと現存するイソクリノイドの比較.
主要な成果:
- セイロクリヌスの茎のステレオーム組織は,現存するベンティック・クリノイドを反映し,インターペタロイドゾーンには迷宮ステレオーム,ペタロイドゾーンにはギャラリー型ステレオームがある.
- ギャラリー状のステレオームはヴォロノイのようなパターンを示し,強度対重量比を最適化し,カルシフィケーションを減少させます.
- セイロクリヌスの茎は,大きな柱間腔のような骨格的な適応を備えており,ベンシック・クリノイドと比較して全体的な体重を大幅に減らす.
結論:
- 微細構造のセイロクリヌス茎は 体重を最小限に抑えながら強さを提供しています
- セイロクリヌスのような擬似プランクトン型クリノイドは,これまで考えられていたよりも軽かった.
- これらのクライノイドは,長期の植民を容易にするため,漂流ログの生息地沈没に大きく貢献していないかもしれません.
関連する概念動画
Diversity of Protists III
127
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...
127
Other Algae
86
The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
86
Diversity of Protists II
134
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
134
Diversity of Protists IV
121
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
121
Surface Appendages of Archaea
153
Archaeal surface appendages are highly specialized structures essential for environmental adaptation, encompassing roles in adhesion, biofilm formation, and motility. Among these appendages, pili and archaella stand out for their distinct morphologies and functionalities, enabling archaea to thrive in diverse and often extreme environments.Pili: Adhesion and Biofilm FormationPili are filamentous structures assembled from pilin protein subunits, primarily contributing to adhesion and biofilm...
153
Green Algae
202
Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
202

