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Rajiformes
Sign in to saveRajiformes is one of the four orders in the clade Batomorphi, often referred to as the superorder Batoidea, flattened cartilaginous fishes related to sharks. Rajiforms are distinguished by the presence of greatly enlarged pectoral fins, which reach as far forward as the sides of the head, with a generally flattened body. The undulatory pectoral fin motion diagnostic to this taxon is known as rajiform locomotion. The eyes and spiracles are located on the upper surface of the head and the gill slits are on the underside of the body. Most species give birth to live young, although some lay eggs e
OverviewAI-generated
Rajiformes is an order of elasmobranchs within the class Elasmobranchii and phylum Chordata. It belongs to the parent taxon Batomorphi. The order was established by Berg in 1940 and is currently accepted as a valid taxon. Common names for this group include "ekte skater" and "roggen."
Members of Rajiformes inhabit marine and brackish environments. The temporal range for this order begins in the Eocene. Records indicate that specimens have been collected in the United States, with holdings at institutions such as SDNHM, ROM, and UF. The taxon has an occurrence count of 809,017, while iDigBio lists 122 records and 6 media items.
Synthesized by Vinony from 28 facts across 6 sources: Wikidata, GBIF, Gbif Occ, WoRMS, iDigBio, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.
Species
roggen
ORDER
- KingdomAnimalia
- PhylumChordata
- ClassElasmobranchii
- OrderRajiformes
In die Ordnung der Rajiformes werden je nach Autor eine bis vier rezente Familien der Rochen vereinigt. Die Systematik der Rochen ist stark umstritten und ständigen Revisionen ausgesetzt.
via GBIF
Museum specimens
- Specimen records
- 122
- With media
- 6
- Collections
- SDNHM, ROM, UF
- Recorded in
- United States
~6 min read
Encyclopedic overview
6 sectionsContents
- Characteristics
- Distribution
- Diversity
- Families
- Biology
- References
Rajiformes is one of the four orders in the clade Batomorphi, often referred to as the superorder Batoidea, flattened cartilaginous fishes related to sharks. Rajiforms are distinguished by the presence of greatly enlarged pectoral fins, which reach as far forward as the sides of the head, with a generally flattened body. The undulatory pectoral fin motion diagnostic to this taxon is known as rajiform locomotion. The eyes and spiracles are located on the upper surface of the head and the gill slits are on the underside of the body. Most species give birth to live young, although some lay eggs enclosed in a horny capsule ("mermaid's purse").
== Characteristics == Rajoids typically have a dorsoventrally flattened body. The snout is slender and pointed and the wide mouth, often covered with a fleshy nasal flap, is on the underside of the head. The eyes and well-developed spiracles are located on the top of the head. In most species, the spiracles are large and are the main means of drawing water in for respiration. There is no nictitating membrane and the cornea is continuous, with the skin surrounding the eyes. The gill slits are on the ventral surface just behind the head. The front few vertebrae are fused into a synarcual and this either articulates with the bones of the well-developed pectoral girdle or is fused to them, the suprascapulae uniting above the vertebral column. Most species have enlarged, thornlike dermal denticles on their skin, often with a row of large denticles along the spine.
Excerpted from Wikipedia’s “Rajiformes” article, available under the CC BY-SA 4.0 licence.