Pterosagitta draco   (Krohn,  1853) (Marine Worm)
Organism information awaits expert curation
Class: Sagittoidea

Image copyrights: SERTC

Size: Length up to 16 mm; Tail 38-40% of total body length.

Opaque, firm and stout body. Large head with obvious neck. On each side of head 8-10 hooks, 6-10 anterior teeth, 8-18 posterior teeth. No intestinal diverticula. Eyes round with T-shaped pigment-spot. The ventral ganglion is situated about midway along the trunk, slightly closer to the neck. Massive collarette, present even in young specimens, extending from the neck over the paired fins, thinning towards the tip of the tail. A single pair of lateral fins, semicircular in shape and with no rayless zones, run between the trunk/tail septum and the seminal vesicles.

Mature ovaries can reach to the neck region, ova in 2 rows arranged dorsoventrally. Ova large and round, but can be compressed into flat cylinders in mature specimens. The seminal vesicles touch the lateral fins and are close to the tail fin.

Synonym (s)
Pterosagitta besnardi Vannucci and Hosoe, 1952
Sagitta draco Michael, 1911
Spadella draco Krohn, 1853

Common Name (s)
Economic Importance and Threats

Habitat:  Pelagic, Coastal


• Tamil Nadu, Chennai Coast INDIA
• Kerala, Off Vizhinjam INDIA (Record: 01/1990-12/1990)
• Arabian Sea (Lat: 16) (Long: 62) INDIA (Record: 12/09/1991-23/09/1991) (Depth: 200-500 mts)
• Arabian Sea (Lat: 23) (Long: 73) INDIA (Record: 12/09/1991-23/09/1991) (Depth: 200-500 mts)
• West Coast INDIA

Literature Source(s)
  • Alfred, JRB; Das, AK and Sanyal, AK (Eds.) (1998) Faunal diversity in India ZSI, Calcutta 1-497 Available at - NCL, Pune
  • Venkatraman, K; Srinivasan, M; Satyanarayana, CH and Prabhakar D (2002) Faunal diversity of Gulf of Mannar biosphere reserve Conservation area series 15 ZSI 77 pp; VIII pla Available at - NCL, Pune
  • Nair, VR Chaetognatha NIO, Goa Available at -
  • Conway, DVP; White, RG; Hugues-Dit-Ciles, J; Gallienne, CP and Robins, DB (2003) Guide to the coastal and surface zooplankton of the south western Indian Ocean Occasional publication no 15 Marine Biological Association of the United Kingdom Occasional Publication of the Marine Biological association of the United Kingdom 354 pp Available at -
  • Hussain, SM Brief report on biodiversity in the coastal areas of Pakistan p 113
  • Troost, DG; Sutomo, AB and Wenno, LF (1976) Distribution and abundance of major zooplankton groups in Ambon Bay (Maluku, Indonesia) during a salp swarming, with notes on Chaetognatha and Pteropoda species Marine Research in Indonesia Lembaga Oseanologi Nasional (National Institute of Oceanology) Lembaga Ilmu Pengetahuan Indonesia, Jakarta, Indonesia 16 31-44 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • McLelland, JA and Michel, HB Interactive key to the species of Chaetognatha from the south Atlantic Bight and northern Gulf of Mexico Southeastern regional taxonomic center: Taxonomic information Available at -
  • Dr. Ramesh, R; Dr. Nammalwar, P and Dr. Gowri, VS (2008) Database on coastal information of Tamil Nadu Report Submitted to Environmental Information System (ENVIS) Centre, Department of Environment, Government of Tamil Nadu Institute for Ocean Management, Anna University, Chennai, Tamil Nadu. Available at -
  • George, RM; Thomas, PA; Jasmine, S; Nair, KR and Vasanthakumar, R (1998) Observations on the distribution and seasonal fluctuations of chaetognaths off Vizhinjam, southwest coast of India Journal of the Marine Biological Association of India The Marine Biological Association of India, Cochin 40(1&2) 6-10 Available at - NIO, Goa
  • Sealifebase Available at -
  • Goswami, SC and Srivastava, Y (1996) Zooplankton standing stock, community structure and diversity in the northern Arabian Sea Proceedings of the Second Workshop on Scientific Results of FORV Sagar Sampada Department of Ocean Development, New Delhi, India 127-137p Available at -
  • Srinivasan, M (1947) Distribution of chaetognaths,with special reference to Sagitta decipiens as an indicator of upwelling along the west coast of India Journal of the marine biological association of India The marine biological association of India 16(1) 126-142 Available at -
  • Lutschinger, S (1993) The marine fauna of New Zealand: Chaetognatha (Arrow worms) New Zealand Oceanographic Institute Memoir 101 61pp Available at - NIO, Goa

Page last updated on:2011-09-02

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