Eleotris grandiceps Krefft, 1864 The flathead gudgeon (Philypnodon grandiceps) is a species of fish in the family Eleotridae endemic to eastern Australia.

[1] Gerard Krefft described the flathead gudgeon in 1864 as Eleotris grandiceps, recording it from the Upper Hawkesbury River and its tributaries, and freshwater lagoons near Richmond, Eastern Creek, and Bronte.

The flathead gudgeon can be distinguished from the dwarf flathead gudgeon (Philypnodon macrostomus) by barred lines on its flanks, larger size (the latter species only reaching 5 cm (2 in) long), and wide gill openings.

[5] Carnivorous, the flathead gudgeon preys upon small fish, tadpoles, and aquatic arthropods.

[6] The female lays 500–1000 elongated eggs on a hard surface in spring, which are watched over afterwards by the male.