Halammohydra intermedium   Rao,  1993 (Hydrozoan)
Organism information awaits expert curation
Class: Hydrozoa

Size: Total length 450-480 µm.

Body elongated, elliptical, tapers considerably towards aboral end, opaque and sparsely ciliated. Gastric tube is about 400 µm long and 140 µm in maximum diameter. The neck is short and thick. Aboral cone is pear-shaped with well developed adhesive organ occupying about half of the upper part of cone. Adhesive organ cup-shaped. Two distinct whorls of long tentacles arise from the aboral cone, numbering 3+6. The first whorl of tentacles nearly is of the same size and about 280 µm long, while the second whorl of tentacles is longer and considerably varies in length from 400-650 µm. One of the posterior tentacles is always longer than the others. All the tentacles are uniformly thick all along their length. During locomotion the anterior tentacles are extended and directed forwards, while the posterior ones trail behind. Annulation of the tentacles is indistinct. Alternating with the posterior tentacles occur 3 statocysts of the lithostyle type, measuring about 5 µm in diameter. The cnidome consists of two types of nematocysts, namely, stenoteles and euryteles. The stenoteles are of a single category and oval. The euryteles are also of one size categoryand oblong. In discharged condition, both the nematocysts with capsule and shaft together attain greater length, depending on the state of extension. The shaft bears stylets and apical spines.

The sexes are separate. Both the males and females bear one gonad only extending between the equidermis and the gastrodermis of the gastric tube.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Sandy, Coastal


• Andaman and Nicobar Islands, Harmindar Bay (Lat: 10.75) (Long: 92.5) INDIA
• Andaman and Nicobar Islands, Harmindar Bay INDIA (Record: 25/03/1990) (Depth: 0.05-0.1 mts)
• Andaman and Nicobar Islands, South Bay INDIA (Record: 26/03/1990)
• Andaman and Nicobar Islands, West Bay INDIA (Record: 28/03/1990)

Literature Source(s)
  • Rao, GC (1993) Littoral meiofauna of Little Andaman Records of the Zoological Survey of India. Occasional paper no. 155 ZSI, Calcutta 120 pp Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org

Page last updated on:2010-06-18

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