Clytia elsaeoswaldae Stechow, 1914

Calder, Dale R., 2013, Some shallow-water hydroids (Cnidaria: Hydrozoa) from the central east coast of Florida, USA, Zootaxa 3648 (1), pp. 1-72: 54-55

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Clytia elsaeoswaldae Stechow, 1914


Clytia elsaeoswaldae Stechow, 1914  

Fig. 15e View FIGURE 15

Clytia elsae-oswaldae Stechow, 1914: 125   , fig. 4.

Type locality. U.S. Virgin Islands: St. Thomas , Charlotte Amalie ( Stechow 1914)   .

Voucher material. Off St. Lucie Inlet, 27°10.7’N, 80°02.7’W, on Eudendrium carneum   , 23 m, vii.1975, Johnson-Sea-Link, JSL 274, one colony, up to 4 mm high, with gonophores, coll. T. Askew, ROMIZ B1134 GoogleMaps   .

Remarks. Lindner et al. (2011) have been followed in recognizing Clytia elsaeoswaldae Stechow, 1914   (type locality: St. Thomas) as distinct from Clytia gracilis (M. Sars, 1850)   (type locality: Norway). Suspicions had been raised earlier, on zoogeographic grounds, that the two might be distinct ( Calder 1991a: 57). As with material of Lindner et al. from Brazil and type material from the U.S. Virgin Islands, gonothecae of hydroids from Florida examined here were borne on the stolons or mostly so. The species appears to be endemic to shallow-waters of the warm western Atlantic. Material earlier identified as C. gracilis   by me ( Calder 1991a) from Bermuda is referable to the same species. A phylogenetic analysis by Lindner et al. (2011) indicates that C. elsaeoswaldae   is related phylogenetically to C. hemisphaerica ( Linnaeus, 1758)   and to several species resembling C. gracilis   .

Clytia elsaeoswaldae   is distinguished in part by the following combination of characters: (1) colonies are stolonal, or erect with monosiphonic and dichotomously branched hydrocauli; (2) hydrothecae have about 9–14 cusps that are usually inclined to the right when viewed laterally; (3) gonothecae tend to arise from the hydrorhiza, and have smooth to slightly undulated walls ( Lindner et al. 2011).

The hydroid examined here was growing as an epizoite on a stem of Eudendrium carneum Clarke, 1882   . Its stolons were entangled with those of a colony of C. linearis ( Thornely, 1900)   , discussed below.

Reported distribution. Atlantic coast of Florida. First record.

Western Atlantic. Bermuda ( Calder 1991a, as Clytia gracilis   ) to Brazil (Oliveira et al. submitted), and including the Caribbean Sea ( Stechow 1914).














Clytia elsaeoswaldae Stechow, 1914

Calder, Dale R. 2013

Clytia elsae-oswaldae

Stechow, E. 1914: 125