Aka diagonoxea   Thomas,  1968 (Sponge)
Organism information awaits expert curation
Class: Demospongiae

Color: Fistule brown or pale white.

Sponge boring, chambers found inside the corals are large and irregular in outline. Fistules projecting from the substratum long and branching dichotomously or polychotomously. Pore bearing fistules short and stumpy. Pores terminal. Oscules terminal and single. The chambers formed inside the coral communicate with adjacent ones by two types of openings (1) wide openings of about 3 mm diameter and (2) small openings in groups. It is observed that in some advanced stages these openings are located on pillar-like structures projecting into the interior of the chamber in a radial pattern. Such structures are brought about by the dissolution of calcareous matter just around the pore. The pulpy mass inside the chamber is yellow in colour. Fistules hard and breakable. Dermal membrane is thin and transparent, brown pigment granules are present abundantly in some places. Oxeas are tangentially arranged. No spongin is present in the dermal part. The main skeleton consists of well developed fibres running longitudinally up through the interior. Towards the basal part of each fistule, these fibres fuse together and form compound fibres, whereas at the terminal parts they become more diffused. Spongin visible and pale yellow in colour. Spicular arrangement of the pulpy mass of the interior is rather vague. Oxeas are distributed irregularly. Calcareous particles are present crowded together at certain places.

Synonym (s)

Common Name (s)
Economic Importance and Threats

Habitat:  Reef Associated, Rocky


• Tamil Nadu, Gulf of Mannar INDIA
• Tamil Nadu, Palk Bay INDIA
• Off Orissa Coast INDIA

Literature Source(s)
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at - http://www.marinespecies.org
  • Marine Biological Station, Chennai, Tamil Nadu (2003) Checklist of marine fauna of Tamil Nadu Department of Environment, Government of Tamil Nadu Available at - http://tnenvis.nic.in
  • Calcinai, B; Cerrano, C and Sara, M (2000) Boring sponges (Porifera, Demospongiae) from the Indian Ocean Italian Journal of Zoology 67 203-219 Available at - http://pdfserve.informaworld.com/550418_772698611_908272247.pdf
  • Thomas, PA (1968) Studies on Indian Sponges II. Two new species of silicious sponges belonginq to the genera Aka de Laubenfels and Damirina Burton Journal of the Marine Biological Association of India Marine Biological Association of India 10(2) 250-254 Available at - eprints.cmfri.org.in/1545/1/Thomas_250-254.pdf
  • Thomas, PA; Sree, A; Bapuji, M; Rao, KM and Murthy, KSR (2002) Biodiversity, zoogeography and affinity of Orissa sponges Proceedings of the National Conference on Utilization of Bioresources - NATCUB-2002 Allied Publishers; New Delhi 351-360 Available at - http://drs.nio.org/drs/handle/2264/1353

Page last updated on:2011-09-30

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