Arrowhead dogfish vs Long-tailed Sylph

Deania profundorum compared with Aglaiocercus kingii

Key Differences

Arrowhead dogfish is Near Threatened while Long-tailed Sylph is Least Concern.

Taxonomic Classification

Rank	Arrowhead dogfish	Long-tailed Sylph
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Elasmobranchii	Aves (Birds)
Order	Squaliformes (Squaliformes)	Apodiformes (Apodiformes)
Family	Centrophoridae	Trochilidae
Genus	Deania	Aglaiocercus
Species	Deania profundorum	Aglaiocercus kingii

Evolutionary Relationship

Arrowhead dogfish and Long-tailed Sylph share a common ancestor at the Phylum level: Chordata. (Chordates)

View Phylum: Chordata

Conservation Status

Arrowhead dogfish

NT — Near Threatened

Long-tailed Sylph

LC — Least Concern

Physical Characteristics

Attribute	Arrowhead dogfish	Long-tailed Sylph
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Arrowhead dogfish

Habitat

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

Range

Distributed across Portugal and Taiwan. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Long-tailed Sylph

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Distributed across Colombia, Ecuador, Norway, and Venezuela.

Arrowhead dogfish

The Arrowhead dogfish, Deania profundorum, is a species. It is currently assessed as near threatened on the IUCN Red List. Native to Asia and Europe, inhabiting ecosystems characteristic of the region.

Long-tailed Sylph

One of the most strikingly ornamented hummingbirds, male long-tailed sylphs have iridescent green plumage and dramatically elongated, ribbon-like outer tail feathers reaching up to 22 cm — over three times the body length. Found in Andean cloud forests of Colombia and Venezuela, they inhabit humid montane forest between 1,400–2,800 meters elevation. Males perform elaborate display flights to attract females. Their extravagant tails are a classic example of sexual selection via female preference.