Aquilonastra O’Loughlin

O’Loughlin, P. Mark, 2015, New asterinid seastars from northwest Australia, with a revised key to Aquilonastra species (Echinodermata: Asteroidea), Memoirs of Museum Victoria 73, pp. 27-40 : 28

Key (see Remarks) to the species assigned to Aquilonastra O’Loughlin (in O’Loughlin & Waters 2004) (revised from the key in O’Loughlin & Rowe 2006).

1. Typically 5 equal or subequal rays, sometimes 6 or 4; form symmetrical or near symmetrical; single conspicuous madreporite, rarely 2, very rarely 3; not fissiparous 2

— Typically 5 or more rays, up to 9, in unequal size groups; form asymmetrical; always more than 1 inconspicuous madreporite; fissiparous 20

2. Gonopores actinal (clearly evident) 3

— Gonopores abactinal (sometimes obscured) 5