Cordagalma cordiformis   Totton,  1932 (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Size: 30 cm long semi-contractile and fragile.

Nectosome: 10 cm long; bearing 7 pairs of biserially and alternately arranged nectophores.

Pneumatophore: Small, fusiform, pigmented apex.

Nectophores: 7 mm X 6 mm X 4 mm in size. Upto 7 pairs of mature and several buds of immature ones present. Small, fragile, typically heart-shaped. When viewed with ostium uppermost, two lateral lobes or wings of nectophore separated from one another by a sharp cleft, lateral sides narrowing beyond ostium into a blunt tip, resembling the heart. Deeply grooved on the ventral side. Nectosac almost heart-shaped, with ostium lying in centre of nectophore on dorsal side. Pedicular canal at base, directly opposite to ostium. Dorsal and ventral radial canals short, straight. Lateral radial canals simple, running upwards to half the length of nectosac, then curving down without forming any sigmoid loops on lateral sides before joining circular canal. Point of attachment to nectosome unusually low.

Siphosome: 20 cm long; 0.12 mm thick.

Gastrozooids: Well spaced, 2 mm long with pigmented base; with hepatic bands. Tentilla larval type, cnidosacs round to oval-shaped with a row of proximal large bean-shaped and distal elongated cigar-shaped, stenostele type of nematocysts; 6-8 sharp bristles radiating from tip. No terminal filament. Resemble tentilla of protosiphon of Nanomia bijuga.
Palpons: In two groups, in internode between two gastrozooids. Female gonophores at base of proximal palpon; male gonophores at base of distal palpon.

Female gonophores (Gynophores): In groups of various growth stages. Mature gonophore with short stalk, round-shaped, typically medusoid structure. A single ovum borne on manubrium.

Male gonophores (androphores): Distal to female gonophores, similar in size and shape; germ cells borne on spadix of manubrium

Bracts: Entire stem covered with numerous prismatic, pyramidal, trapezoidal-shaped bracts. Ventral facet broader than dorsal facet. i.e. Pyramid with its apex sliced off forming a smaller trapezoidal facet on dorsal side. Four faceted sides oblique. Thick bracteal canal in centre. Attached to stem by small peg-like pedicel.

Synonym (s)
Anthemodes ordinata Haeckel, 1888
Cordagalma cordiformis Daniel, 1974
Cordagalma cordiformis Totton, 1932

Common Name (s)
Economic Importance and Threats



• Bay of Bengal (Lat: 15) (Long: 90) INDIA
• Bay of Bengal (Record: 1962-1965)
• Arabian Sea (Record: 1962-1965)

Literature Source(s)
  • Daniel, R (1985) Fauna of India and the adjacent countries (Coelenterata: Hydrozoa: Siphonophora) ZSI 440 pp Available at - NIO, Goa
  • Zoological Survey of India (Eds) (1991) Animal resources of India (Protozoa to Mammalia) ZSI 1-694 Available at - NCL, Pune
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -

Page last updated on:2010-06-16

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