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  • top pale brown
    central disc thorns: 1 row at front, gap, 3 rows at rear
    shoulder 3-4 thorns
    Ds & C black
    Ds far apart
    Fenestraja atripinna, Blackfinned windowskate, Blackfin pygmy-skate
    no pits at corners nasal curtain
    under tail + denticles
  • top disc dark blotches, tail dark crossbars
    central disc thorns: small, 1 row 72 to D
    shoulder: 0/2 thorns
    Fenestraja cubensis, Cuban windowskate, Cuban pygmy skate
    no pits at corners nasal curtain
    pelvics: front lobe 70% rear lobe
  • top uniform color
    center disc thorns: 1 row, 4 + space+ ~54 to D
    shoulder 1-2 thorns
    Fenestraja ishiyamai, Ishiyama's windowskate
    no pits at corners nasal curtain
  • top disc dark blotches, tail dark crossbars
    center disc thorns: 1 row 45-70 nape to front 1/2 tail
    shoulder 2-4 thorns
    thorns on center disc & tail large
    Fenestraja plutonia, Underworld pygmy-skate, Underworld window-skate
    no pits at corners nasal curtain
    pelvic: front lobe = rear lobe
  • brown above, yellow below
    central disc thorns: 3-4 rows rear disc to D
    triangle of thorns: nape & shoulders
    Fenestraja sinusmexicanus, Gulf skate, Gulf windowskate
    no pits at corners nasal curtain
    pelvic: front lobe 80-100% rear lobe