Compact Stonewort vs giraffe

Nitella tenuissima compared with Giraffa camelopardalis

Key Differences

Compact Stonewort is Extinct while giraffe is Vulnerable.

Taxonomic Classification

Rank	Compact Stonewort	giraffe
Kingdom	Plantae (植物)	Animalia (動物)
Phylum	Charophyta (車軸藻植物門)	Chordata (脊索動物)
Class	Charophyceae (車軸藻綱)	Mammalia (哺乳類)
Order	Charales (車軸藻類)	Artiodactyla (偶蹄目)
Family	Characeae	Giraffidae (Giraffes)
Genus	Nitella	Giraffa (Giraffes)
Species	Nitella tenuissima	Giraffa camelopardalis

Conservation Status

Compact Stonewort

EX — Extinct

giraffe

VU — Vulnerable

Population: ~117.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Compact Stonewort	giraffe
Diet	—	Herbivore
Average Lifespan	—	25 years
Average Length	—	5.5 m
Average Weight	—	1.2 t

Habitat & Geographic Range

Compact Stonewort

Habitat

Native to Asia and Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Brazil, Norway, Sweden, Taiwan, and United States.

giraffe

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and flooded grasslands and savannas, among 5 distinct biome types within the Neotropic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Ecuador. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Compact Stonewort

<em>Nitella tenuissima</em>, a stonewort formerly found in fresh and brackish water habitats, was a member of the charophyte family Characeae — the algal lineage most closely related to land plants. Historical records document its occurrence across Brazil, Norway, Sweden, Taiwan, and the United States, where it inhabited clear, oligotrophic lakes, ponds, and slow-flowing water bodies with low nutrient levels. Like other Nitella species, it was a delicate, translucent, submerged aquatic plant lacking the calcium carbonate encrustation of related genera, forming low-growing mats on soft sediments in well-illuminated shallow water. The species played a role in aquatic ecosystems by stabilising lake sediments, contributing to water clarity, and providing microhabitat for invertebrates and small aquatic organisms. <em>Nitella tenuissima</em> is classified as Extinct by the IUCN, having not been recorded from any of its former localities despite targeted searches. The primary causes of its extinction are believed to be widespread eutrophication of freshwater habitats driven by agricultural nutrient runoff and sewage discharge, which eliminated the clear, nutrient-poor conditions on which the species depended. The loss of this stonewort is emblematic of the broader decline of freshwater charophyte diversity across the Northern Hemisphere. Biological traits including historical morphological measurements and reproductive parameters are documented only in sparse historical herbarium specimens and early botanical literature.

giraffe

地球上で最も背の高い動物であるキリン（Giraffa camelopardalis）は体高が5.5mに達し、体重は最大1,750kgにもなる。すべての哺乳類と同じ7個の頸椎からなる長い首は、アフリカのサバンナや疎林のアカシアの木に食物を求めて進化した。永続的な絆を持たない緩やかな群れで生活する社会的動物で、超低周波音と身振りで意思疎通する。生息地の喪失と密猟により個体数が減少している危急種である。