Filellum conopeum Watson, 2003

Hydrothecae stolonal, arising from a tunnel-shaped stolon with flattened base, wall rugose, perisarc thin. Proximal quarter to one third of hydrotheca adnate to stolon, dorsal abcauline wall furrowed by many close, sharp-edged ridges with minute ragged frill of perisarc; ridges fading on adnate wall. Adnate wall becoming free at a sharp upward bend, free part cylindrical or weakly expanding from bend to margin, free part straight to broadly curved, walls smooth, occasionally with several regenerations. Margin circular, transverse, with smooth, distinctly everted rim. Perisarc of walls fairly thick, thinning distally.

Hydranth with c. 12 tentacles and clavate hypostome. Coppinia bud-shaped, c. 1 mm wide and 1 mm high, comprising many tightly packed gonothecae enclosed within a cone of protective nematophorous tubules.

Gonotheca flask-shaped (lateral view), base rounded, body expanding a little from base to shoulder then narrowing into a short straight or slightly curved neck tapering to a circular aperture; in transverse view gonothecae polygonal. Nematophorous tubules similar in length, not forked, conjoined just above gonothecae then becoming free, most narrowing distally and inwardly curved to meet above gonotheca; terminal orifice circular. Perisarc of gonothecae and tubes moderately thick; perisarc of tubes somewhat roughened.

Planulae enclosed in gonothecae small, spherical.

Colour: Colonies colourless, planulae creamy pink.