Elasmobranchii (sharks and rays) > Squatiniformes
(Angel sharks) > Squatinidae
Etymology: Squatina: Latin, squatina, -ae = a kind of shark (Ref. 45335); mexicana: Named for its type locality, Mexico.
Environment: milieu / climate zone / depth range / distribution range
Marine; demersal; depth range 71 - 180 m (Ref. 74686), usually - m (Ref. ). Tropical; 0°C -
Western Atlantic: Gulf of Mexico.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 88.0 cm TL male/unsexed; (Ref. 74686)
Morphology | Morphometrics
This species has no thorns or enlarged denticles on the mean dorsal line. The dermal skin denticles has 3 keels extended posteriorly, its base about 4 times its length. The dorsal fins are similar in size, shape and area, their base about 1.75 times their height. Nasal lobes are simple, the anterior thin and longer; the medium lobe quadrangular and almost lacking lobes Body color gray, no ocelli, but with 2 very evident black spots on the anterior edge of pectoral fins; the rest of body is black with small scattered dark spots located irregularly. Both sides of the upper jaw has 10 triangular, erect, and non edge-serrated teeth, arranged in 2 functional series; lower jaw with 9-10 smooth triangular teeth; 5 frontal teeth are straight, the rest are slightly oblique and arranged in 2 functional series (Ref. 74686).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Castro-Aguirre, J.L., H.S. Espinosa Pérez and L. Huidobro Campos, 2006. Dos nuevas especies del género Squatina (Chondrichthyes: Squatinidae) del Golfo de México. Rev. Biol. Trop. (Int. J. Trop. Biol.)  54 (3):1031-1040. (Ref. 74686)
IUCN Red List Status (Ref. 124695)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingNutrientsMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 19.7 - 26, mean 21.8 °C (based on 13 cells).
Phylogenetic diversity index (Ref. 82805
= 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00741 (0.00282 - 0.01947), b=3.04 (2.81 - 3.27), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic level (Ref. 69278
): 4.0 ±0.6 se; based on size and trophs of closest relatives
Resilience (Ref. 120179
): Medium, minimum population doubling time 1.4 - 4.4 years (Preliminary K or Fecundity.).
Vulnerability (Ref. 59153
): Moderate to high vulnerability (47 of 100) .