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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 1d

Porcelaneous foraminifera are so named because their shells have a smooth, milky-white appearance that resembles fine porcelain or ceramic ware. In addition to porcelaneous forms, foraminifera are also classified into hyaline, agglutinated, soft-shelled, and naked types

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 1d

科学探求おしゃべり番組「ススメ！有孔蟲」更新日です
Ep. 48 星砂は幸せの砂？質問カードへご回答！
参加者のみなさんからいただいたご質問にお答えしました！
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Reposted by 科学探求おしゃべり番組「ススメ！有孔虫」

SciGrl @jyrscigrl.bsky.social · 3d

Fascinating thread! Evolution is such an amazing mechanism that uses small changes to create incredible complexity.

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Tiny fossils called foraminifera lie buried in marine sediments.
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n

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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Nagai, Y. et al. (2018). Weaving of biomineralization framework in rotaliid foraminifera: implications for paleoceanographic proxies. Biogeosciences, 15, 6773–6789. doi.org/10.5194/bg-1...

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Weaving of biomineralization framework in rotaliid foraminifera: implications for paleoceanographic proxies

Abstract. Elemental and/or isotopic signatures of calcareous tests of foraminifera are commonly used to reconstruct paleoenvironmental conditions. A major problem, often referred to as the “vital effe...

doi.org

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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

References
Tyszka, J., & Topa, P. (2005). State-of-the-art in modelling of foraminiferal shells. Studia Geologica Polonica, 124, 143–156.
Tyszka, J. (2006). Morphospace of foraminiferal shells: results from the moving reference model. Lethaia, 39(1), 1–16. doi.org/10.1080/0024...
16/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

In this sense, foraminiferal morphology is not just a product of geometry,
but an expression of biological strategy, a balance between speed and safety.
15/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

However, it fails to reproduce genera such as genus Lenticulina, which arrange their apertures in ways that lengthen the internal pathways.
Perhaps these species prioritize safety over efficiency. They designing shells that slow the inflow of external materials and potential threats.
14/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1 1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Efficiency or safety - survival strategies encoded in form
The shortest-path model fits well with rotaliid foraminifera, whose spiral forms seem optimized for efficient internal communication.
13/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

When this “shortest-path rule” is applied, the resulting virtual shells reproduce the shapes of many real foraminifera remarkably well.
12/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

This represents the shortest route through which signals and materials can flow inside the cell.

In the model, the position of each new chamber is set so that the LCP to the previous chamber is minimized.
11/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

A model that even considers cellular connectivity
What makes this theory particularly appealing is that it incorporates the ease of connection between successive chambers called the Local Communication Path (LCP).
10/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

By varying these parameters, the model can simulate a broad range of shell architectures observed in nature.

9/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Deviation Angle (Δφ or Df): How much the direction shifts between chambers
Rotation (β): The overall twist of the test (shell)
In addition, the aspect ratios of each chamber — kx (width), ky (height), and kz (depth) — can be adjusted.
8/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

The repetition of this process determines the overall shell shape.

The model defines morphology through a few geometric parameters:

Growth Factor (GF): How much each new chamber expands
Translation Factor (TF): How far apart successive chambers are positioned
7/n

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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Four parameters that define the shape
Tyszka’s model reconstructs how a foraminifer builds each new chamber.
The organism extends its pseudopodia fan-like from the aperture, forms a thin membrane ballooning outward, and then deposits calcium carbonate on that surface to create a new wall.
6/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

With just a few geometric rules, this model successfully reproduced many of the fundamental morphologies seen in real foraminifera.

5/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Around 2005–2006, Polish foraminiferalogist Jarosław Tyszka proposed a new idea: a model that focuses on the organism’s growth process itself.
He called it the Moving Reference Model (MRM).
4/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

In the past, researchers tried to reproduce these forms using logarithmic spirals. Equations that describe seashells because foraminiferal shells often resemble them.
However, such approaches failed to generalize across the full diversity of foraminiferal shapes.
3/n

Morphospace of foraminiferal shells: results from the moving reference model

The moving reference model of foraminiferal tests (shells) is based on principal morphogenetic rules revealed from real foraminifera. The model has introduced apertures as moving reference points base...

doi.org

1

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

In rotaliid foraminifera, despite their wide range of shapes, simulations have shown that their morphology can, in fact, be described using only a handful of parameters. 2/n

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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 3d

Tiny fossils called foraminifera lie buried in marine sediments.
Their shells display astonishing diversity from spiraling forms to chambered clusters and even architectures that resemble miniature buildings.
But what if this morphological variety could be explained by only a few simple rules? 1/n

1 6 9

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 16d

太陽の砂＝カルカリナ。有孔虫の仲間で、砂粒みたいなのにトゲから仮足を伸ばして「歩く」ことができます。
体の中に藻を住まわせて太陽の光でエネルギーを得る…まるで動くマンション
遺伝子解析の時はDNAがほとんど藻類になるので両者の分離がカギになるね

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 16d

open.spotify.com/episode/2uAc...

新月！更新！こんかいは本の虫のススメコラボ回
とっても楽しいラボツアーの様子です！
聞いてみてね

Ep. 47 祝初コラボ！ようこそ、有孔虫ラボへ

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3 2

Reposted by 科学探求おしゃべり番組「ススメ！有孔虫」

うみねこ博物堂 @umineko22.bsky.social · 20d

本日もご来店ありがとうございました。明日からは涼しくなるという予報…信じますよ！！

ご紹介しそびれてしまったのですが、古いものがいろいろと届いております。瓶とか缶とか。それについてはまた明日！

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科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 25d

#ニコニコ動画にEp. 44をアップロードしました。【研究者ラボトーク】Ep.44 月齢と海の生き物や、サイエンスとアート、学会参加報告、トークイベント情報など【ススメ！有孔蟲】
www.nicovideo.jp/watch/sm4540...
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【研究者ラボトーク】Ep.44 月齢と海の生き物や、サイエンスとアート、学会参加報告、トークイベント情報など【ススメ！有孔蟲】

【研究者ラボトーク】Ep.44 月齢と海の生き物や、サイエンスとアート、学会参加報告、トークイベント情報など【ススメ！有孔蟲】 [自然] 大潮更新のこの番組、そもそも有孔虫や海の生きものに月齢は影響してるのでしょうか？満月・大潮と...

www.nicovideo.jp

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 26d

年間12億トンというのは、例えるなら，東京タワーが1基4000トンらしいので、2分弱に一塔づつ海に沈んでる感じです。思ったより多（略

科学探求おしゃべり番組「ススメ！有孔虫」 @susume-foram.bsky.social · 29d

海洋表層で生産された浮遊性有孔虫は遺骸となって海底に降り注ぎます。場所によっては有孔虫軟泥といって、海底の泥がほとんど浮遊性有孔虫の場所もあります。世界中での年間生産量は12億トンとも見積もられており非常に多くの量の炭酸カルシウムが海底に運ばれています。