Cladonema radiatum Dujardin, 1843

Calder, Dale R., 2010, Some anthoathecate hydroids and limnopolyps (Cnidaria, Hydrozoa) from the Hawaiian archipelago 2590, Zootaxa 2590 (1), pp. 1-91 : 56

Cladonema radiatum Dujardin, 1843

Fig. 37

Cladonema radiatum Dujardin, 1843: 1134 .

Cladonema radiatum .— Cooke, 1977: 77, figs. 5a–c.

Type locality. Mediterranean Sea ( Dujardin 1843).

Material examined. None.

Description. (From Cooke 1977: 77–78): “The hydroid stage consists of polyps approximately 1 mm high which arise singly from a creeping stolon… These polyps have four capitate tentacles arranged at right angles just below the mouth and four short, stiff filiform tentacles lower on the body.”

Remarks. Cooke (1977) reported Cladonema radiatum Dujardin, 1843 from Hawaii, but without locality information. He noted that medusae of the species were frequent in relatively quiet water areas on the chlorophyte Ulva . Sketches were provided of both medusa and hydroid stages, and his account of the hydroid of C. radiatum was based on specimens collected in Hawaiian waters (W.J. Cooke, pers. comm., 4 November 2009). No hydroids of C. radiatum were found in collections at the Bishop Museum.

A thorough review of the species, including a synonymy list, was provided recently by Schuchert (2006).

Reported distribution. Hawaii: No location given ( Cooke 1977).

Elsewhere. Reportedly circumglobal in shallow temperate and tropical waters ( Millard & Bouillon 1973; Calder 1988; Hirohito 1988; Migotto 1996; Schuchert 2006; Mills et al. 2007).