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🌊 Marine Critically Endangered 🌡️ Subtropical

Shortnose eagle ray

Myliobatis ridens Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani, 2012
Max Length
-
Max Weight
-
Lifespan
-
Trophic Level
3.4
Depth
5–47 m
Climate
Subtropical
Resilience
Low
Vulnerability
61.00/100
Typical Length
-
Depth Zone
-

📖 Overview

Male and female mature at approximately 50.0-60.0 mm DW (Ruocco, unpubl. data), and males are typically smaller than females .

Scientific Name
Myliobatis ridens
Authority
Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani, 2012
Habitat
Marine
Climate
Subtropical
IUCN Status
CR
Depth Range
5–47 m
Trophic Level
3.4
Resilience
Low
Vulnerability
61.00/100
Salinity
30–40 ppt

🐟 Physical Description

This species is distinguished by the following set of characters: rhombic disc which is wider than long, width about 2.2-times TL; disc length 58%-64% of DW; anterior margin of disc joining head behind orbits; head clearly protruding from disc, eyes in lateral position, moderate in size; snout width equal to interorbital distance (13.6%-16.5% DW), mouth relatively wide, as broad as distance between 5th gill slits (mouth width 0.8-1-times distance between 5th gill slits); mouth width greater than distance between inner ends of nostrils (1.5-1.6- times); distance between 5th gill slits greater than distance between inner ends of nostrils (1.8-1.6-times) .: other (see remarks); Cross section: flattened.

🌀 Behaviour

Behavioural data for Shortnose eagle ray is currently being reviewed.

🦐 Diet

Diet information for Shortnose eagle ray is currently being compiled.

🥚 Reproduction

Reproduction data for Shortnose eagle ray is currently being compiled.

🌍 Habitat & Distribution

Marine; brackish; benthopelagic; depth range 5 - 47 m , usually 5 - 15 m . Subtropical Southwest Atlantic: Brazil to Argentina.

🌿 Ecology

Zone Preferences
🌊 Marine 🌿 Brackish
Trophic Level
3.4±0.4

📐 Morphometrics

Length–Weight Relationship: W = 0.00389 × L3.09 (TL)

🌡️ Water Parameters & Tolerance

Salinity Range
30–40ppt

🛡️ Conservation Assessment

IUCN Category
Critically Endangered
Assessment Date
2019

📊 Population Risk & Fisheries

Population Resilience
Low
Minimum doubling time
Fishing Vulnerability
61.00/100
High vulnerability
Trophic Level
3.4
Predator
Climate Zone
Subtropical
Described By
Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani, 2012

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