Some anthoathecate hydroids and limnopolyps (Cnidaria, Hydrozoa) from the Hawaiian archipelago 2590 Author Calder, Dale R. text Zootaxa 2010 2010-08-31 2590 1 1 91 https://biotaxa.org/Zootaxa/article/view/zootaxa.2590.1.1 journal article 10.11646/zootaxa.2590.1.1 1175­5334 Order Limnomedusae Kramp, 1938 Limnomedusae Kramp, 1938: 107 . Diagnosis. Hydrozoa with polyps solitary or primitively colonial; hydranths small to minute, morphologically simple, sessile, lacking hydrothecae; hypostome, mouth, and gastric cavity present or absent; tentacles and perisarcal sheath present or absent; asexual reproduction frequent, by frustules, or frustule-like buds, or cysts. Gonophores fixed or free eumedusoids, or medusae. Medusae, when present, with hemispherical to discoidal umbrella; tentacles hollow, lacking basal bulbs; marginal sense organs, when present, comprising internal statocysts; gonads on radial canals or manubrium. Remarks. The history and phylogeny of Limnomedusae Kramp, 1938 has been reviewed by Daly et al . (2007) and Collins et al . (2008) . Bouillon et al . (2006) included 21 genera in the family, many of them poorly known ( Jankowski 2001 ) and over half (12) being monotypic.