Peristediidae: L I A3A

Satyrichthys adeni (Lloyd, 1907)

Armoured gurnard

Egg diameter in µm	Number of oil globules	Diameter of oil globule in µm	Yolk texture	Perivitelline space	Position of oil globule at hatch	Gut length   at eye- pigment stage	Myomeres
1620-1990	1	145-170	clear	narrow	stern	See notes	ca25

Egg: Prior to hatching, the embryo develops a broken line of black pigment dashes on the edge of both the dorsal and ventral finfolds (A). The oil globule is clear. Incubation takes about 70 hours (23°C).

Larva: The black pigment in the finfold edge can be seen in the newly hatched larva (B), when gut length is 44% of NL. The 5-day larva (C) develops a point on the upper edge of the pectoral fin, and retains the pigment in the finfold edge. B: NH; C: 5 days.

The egg and larva bear some resemblance to LIA2, but the myomere count is too low for any species in that family (Trichiuridae). Also similar is Aulostomus chinensis, but the latter is usually smaller, and quickly develops a much more elongate larva, in the egg (LIIA3).

One larval barcode is currently available, from an egg collected in February 2013, and it matches the sequence of 5 locally collected adult Satyrichthys adeni (BOLD). Confirmation must await further larval sequences.

This egg has only been seen on three occasions off Park Rynie (blue graph). The egg was not seen in the DHM samples.