Journal of Threatened Taxa | www.threatenedtaxa.org | 26 August 2017 | 9(8): 10577–10580

 

 

275477.jpg

 

 

 

First report of soft coral Sarcophyton birkelandi Verseveldt, 1978 (Anthozoa: Alcyonacea) in Indian waters from Andaman Islands

 

Seepana Rajendra 1, C. Raghunathan 2, Tamal Mondal 3 & K. Venkataraman 4

 

1,2,3 Zoological Survey of India, Andaman & Nicobar Regional Centre, National Coral Reef Research Institute, Port Blair, Andaman & Nicobar Islands 744102, India

4 National Centre for Sustainable Coastal Management, Anna University, Koodal Building, Chennai, Tamil Nadu 600025, India

1 rajenzsi1992@gmail.com (corresponding author), 2 raghuksc@rediff.com, 3 t_genetics@yahoo.com, 4 venkyzsi56@gmail.com

 

 

 

 

 

doi: http://doi.org/10.11609/jott.2285.9.8.10577-10580 | ZooBank: urn:lsid:zoobank.org:pub:96F726F7-BB0F-4E94-86AC-3FC1EE2111C4

 

Editor: M. Nithyanandan, Kuwait Institute for Scientific Research, Safat, Kuwait. Date of publication: 26 August 2017 (online & print)

 

Manuscript details: Ms # 2285 | Received 08 January 2016 | Final received 02 August 2017 | Finally accepted 09 August 2017

 

Citation: Rajendra, S., C. Raghunathan, T. Mondal & K. Venkataraman (2017). First report of soft coral Sarcophyton birkelandi Verseveldt, 1978 (Anthozoa: Alcyonacea) in Indian waters from Andaman Islands. Journal of Threatened Taxa 9(8): 10577–10580; http://doi.org/10.11609/jott.2285.9.8.10577-10580

 

Copyright: © Rajendra et al. 2017. Creative Commons Attribution 4.0 International License. JoTT allows unrestricted use of this article in any medium, reproduction and distribution by providing adequate credit to the authors and the source of publication.

 

Funding: Ministry of Environment, Forest and Climate Change, Government of India.

 

Competing interests: The authors declare no competing interests.

 

Acknowledgements: The authors are grateful to the Director, Zoological Survey of India for providing facilities.

 

 

 

 

Abstract: Sarcophyton birkelandi Verseveldt, 1978 is reported as a new record to Indian waters from Andaman Islands. Colony morphology, sclerite structures and measurements were extracted and examined from the surface and coenenchyme of both capitulum and stalk for confirmation of species. Structural differentiation was observed in sclerite shape such as club shaped, needle shaped and spindle shaped with a variety of sizes and orientation pattern.

 

 

Keywords: Alcyoniidae, Andaman & Nicobar Islands, Craggy Island, new record, Octocorralia

 

 

 

 

 

Andaman & Nicobar Islands consist of 572 islands, islets and rocky outcrops. The islands are geographically located between 6.750–13.683N & 92.200–693.950E surrounded by Coco Channel to the north, Andaman Sea to the east, Great Channel to the south and Bay of Bengal on the west side with a long coast line of about 1,962km. These islands represent one of the richest coral reef ecosystems in the Indo-Pacific region (Jayasree et al. 1996). Soft corals belong to the order Alcyonacea of phylum Cnidaria, class Anthozoa and subclass Octocorallia. They are soft bodied, leathery, zooxanthellates or azooxanthellates and some are mushroom like and do not produce any calcified exoskeleton. They are well diversified as equal as scleractinian corals in reef ecosystem at par with scleractinian corals in reef ecosystem (Dinesen 1983) and are an important ecological unit due to contributors of coral reef biomass especially of Indo-Pacific region (Tursch & Tursch 1982). Soft corals have a wide distribution: they inhabit the tropics, the sub-tropics, the intertidal zone, the subtidal regions, the reef slope region and the abyssal depths. The species belonging to the family Alcyoniidae are fleshy masses, leathery, stiff hard and flexible and contain clubs, spindles, ovals, barrel shaped, capstans, dumbbells, radiate shaped sclerites as skeletal material and support of the colony and also useful for taxonomic identification. This note describes an alcyonacean coral from the reef ecosystem of the Andaman and Nicobar Islands as a new record to Indian waters.

Materials and Methods

Studies on coral reef ecosystem was carried out at Craggy Island (13.225N & 93.056E), North Andaman by employing a self-contained underwater breathing apparatus (SCUBA) diving down to a depth of 15m in March 2015. A small portion of the colony was sampled for taxonomic study. The specimen was fixed in 4% formalin for 24 hours and preserved in 70% ethyl alcohol after washing under running tap water (Fabricius & Alderslade 2001). Measurement of the colony was taken using Vernier calliper scale (Model: Aerospace 074 15376). Sclerites were extracted by dissolving in 5% sodium hypochlorite (NaClO) (Bayer 1961) and examined under stereo zoom microscope LEICA M 205A for taxonomic analysis. The sample was identified based on morphological characters and sclerite structures in conjunction with Verseveldt (1978).

Results

One species of alcyonacean coral was identified as the new distribution record to Indian waters from the North Andaman Island on the basis of taxonomical attributes. The detailed morphological features are described below.

Systematics

Phylum: Cnidaria Verrill, 1865

Class: Anthozoa Ehrenberg, 1834

Subclass: Octocorallia

Order: Alcyonacea Lamourox, 1812

Suborder: Alcyoniina

Family: Alcyoniidae Lamouroux, 1812

Genus: Sarcophyton Lesson, 1834

Species: birkelandi Verseveldt, 1978

Sarcophyton birkelandi

(Fig. 1, Images 1 & 2)

J. Verseveldt, 1978, 50.

Material examined: ZSI/ANRC-12100, 09.iii.2015, Craggy Island (13.225 N & 93.056 E) North Andaman, coll. Seepana Rajendra.

The length of the stalk is 5.8cm, and the width is 3.9cm. The expanded length of the capitulum is 9.4cm, the length of the larger lobe in the colony is 4cm and width is 2.4cm (Fig. 1). The identified samples were registered as National Zoological Collections and deposited at Zoological Survey of India, Port Blair.

Diagnostic characters: It was a mushroom-shaped colony with both autozooids and siphonozooids. Edges of the capitulum are strongly flattened. The lobes are erect, flat and narrow edges curled towards the outside. The colony is firm but slightly flexible. The centres of the disc have completely retracted (Image 1) autozooids which are 0.70–1.20 mm apart. The distance between edges of the capitulum autozooids are 0.6–1.10 mm and space between autozooids and siphonozooids is 0.4–0.7 mm. The surface layer of the disc contains clubs measuring 0.09–0.19 mm in length. The smaller sclerites are with a central wart on pointed handles with girdles and blunt spines. Some club shaped sclerites have a length of 0.28mm. These longer sclerites have heads compressed of warts and form a bigger structure, and slender handles have conical, spiny prominences (Image 2 A–G). Coenenchymal sclerites of the disc have slender needle shaped sclerites measuring upto 0.47mm. These are pointed at the end, contain spiny structures on body of sclereites (Image 2 H–K). The clubs on the surface layer of the stalk are slightly stronger than the surface layer of the capitulum. The warts are arranged in distinct girdles of 0.09–0.30 mm long (Image 2 H–Q). Interior of the stalk contains wider spindle shaped sclerites measuring 0.27–0.53 mm in length with slightly wider spiny warts (Image 2 R–V). The living colony was brown in colour, light greenish to creamy whitish after preservation in 70% alcohol.

Distribution: Micronesian Islands; India (Andaman Islands)

 

316102.jpg

 

 

316103.jpg

Discussion

The studies on soft corals in the Indian Ocean were started during the last century and have been continued in recent times with scanty of knowledge. The studies on Alcyonacean octocorals from the Indian reefs were initiated since the last century as Thomson and Simpson made an account on collected alcyonarians by the ‘RIMS Investigator’ in the Indian Ocean (Thomson & Simpson 1903, 1909) followed by Thomson & Henderson (1906). The first endeavour on the studies of soft corals of the Laccadives was made by van Ofwegen & Vennam (1991) reporting 19 species. Alderslade & Shirwaiker 1991 described a new species Sarcophyton spinospiculatum along with 17 species. Vennam & Ofwegen (1996) reported 11 species from Lakshadweep Islands. Jayasree & Parulekar (1997) reported 27 species of Alcyonacean corals from the Gulf of Mannar while George et al. (2007) reported three new records to the Gulf of Mannar. In 2015, Sivaleela & Padmanaban (2015) added seven species of Alcyonacean corals to the records from the Gulf of Mannar. Jayasree et al. (1994) described Sarcophyton andamanensis from the Andaman & Nicobar Islands. The preliminary survey on soft coral distribution was conducted in 1996, and reported 26 new distributional records to Indian waters (Jayasree et al. 1996). Rao & Devi (2003) published the taxonomic account of 54 species belonging to the family of Alcyoniidae and gave a checklist consisting of 221 species of Octocorals from the Andaman & Nicobar Islands. Venkataraman et al. (2004) listed a total of 63 species under the said family. Rajendra & Raghunathan (2016), and Rajendra et al. (2017b,c) reported six new records from the Andaman & Nicobar Islands. Recently, Rajendra et al. (2017a) provided current status of Octocorals in India.

The present work reports one species of Alcyoniidae soft coral, i.e., Sarcophyton birkelandi from the North Andaman Island as a new record to Indian waters. This species is closely related to the Sarcophyton mililatensis Verseveldt & Tursch, 1979 and readily differentiated from Sarcophyton stolodotum Verseveldt, 1971. The structure and measurements of sclerites of Sarcophyton stolodotum are different from S. birkelandi and S. mililatensis. In S. mililatensis, the folds of capitulum are pointed and with secondary folds but in S. birkelandi the folds are flat, with a relatively rectangular tip. In S. mililatensis, clubs are strong up to 0.45mm in length, internal sclerites have antler like prominences, sclerites of internal stalk have high spiny warts, but in S. birkelandi internal sclerites are cone like process, internal sclerites of stalk are needle or spindle like.

References

 

 

Alderslade, P. & P. Shirwaiker (1991). New species of soft corals (Coelenterata: Octocorallia) from the Laccadive Archipelago. The Beagale Records of Northern territory Museum of Arts and Science 8(1): 189–233.

Bayer, F.M. (1961). The shallow water octoctorallia of the West Indian region. Studies of Fauna of Curacao 12: 373.

Dinesen, Z.D. (1983). Patterns in the distribution of soft corals across the central Great Barrier Reef. Coral Reefs 1(4): 229–236.

Fabricius, K. & P. Alderslade (2001). Soft Corals and Sea Fans. A Comprehensive Guide to The Tropical Shallow Water Genera of The Central West Pacific, the Indian Ocean and Red Sea. Austrillian Institute of Marine Sciences, and the Museum, Townsville, Queensland, 264pp.

George, R.M., N.K. Sanil & T.S. Naomi (2007). A qualitative appraisal of the soft corals (Octocorallia: Alcyonacea) off Mandapam, South India. Indian Journal of Fisheries 54(1): 99–106.

Jayasree, V. & A.H. Parulekar (1997). The ecology and distribution of Alcyonacean at Mandapam (Palk Bay, Gulf of Mannar), South India. Journal of Bombay Natural History Society 94: 521–524.

Jayasree, V., K.L. Bhat & A.H. Parulekar (1994). Sarcophyton andamanensis, a new species of soft coral from Andaman Islands. Journal of the Andaman Science Association 10(1&2): 107–111.

Jayasree, V., K.L. Bhat & A.H. Parulekar (1996). Occurrence and distribution of soft corals (Octocorallia: Alcyonacea) from the Andaman and Nicobar Islands. Journal of the Bombay Natural History Society 93: 202–208.

Rajendra, S. & C. Raghunathan (2016). New records of two alcyonacean coals to Indian waters from Andaman Islands. Records of Zoological Survey of India 116(3): 307–312.

Rajendra, S., C. Raghunathan, T. Mondal & K. Chandra (2017a). Octocorals of India: diversity and distribution, pp. 190–211. In: Raghunathan, C., K. Chandra, T., Mondal & S. Dash. (eds). Current Status of Marine Faunal Diversity in India. Published by Records of Zoological Survey of India.

Rajendra, S., Raghunathan, C. & K. Chandra (2017b). New record of Sarcophyton cornispiculatum Verseveldt, 197 (Octocorallia:Alcyonacea: Alcyoniidae) in India, from Andaman Islands. The European Zoological Journal 84(1): 167–171.

Rajendra, S., C. Raghunathan & T. Mondal (2017c). New distribution records of three Sarcophyton species (Alcyonacea: Alcyoniidae) in Indian waters from Andaman Islands. Journal of Threatened Taxa 9(7): 10426–10432; http://doi.org/10.11609/jott.2498.9.7.10426-10432

Rao, D.V. & K. Devi (2003). Studies on the soft corals (Octocorallia: Alcyonacea) of Andaman Islands, Bay of Bengal. Records of Zoological Survey of India (Occasional Paper No.) 206: 1–99.

Ofwegen van, L.P. & J. Vennam (1991). Notes on Octocorallia from Laccadives (SW India). Zoologische Mededelingen 65: 143–154.

Sivaleela, G. & Padmanaban (2015). Studies on the Alcyonacean fauna of Gulf of Mannar. Records of Zoological Survey of India 115(1): 21–30.

Thomson, J.A. & W.D. Henderson (1906). An Account of the Alcyonarians Collected by the Royal Indian Marine Survey Ship Investigator in the Indian Ocean. The Alcyonarians of Deep Sea. The Indian Museum, Calcutta 132pp.

Thomson, J.A. & J.J. Simpson (1903). An Account of Alcyonarians Collected by the Royal Indian Marine Survey Ship ‘Investigator’ in the Indian Ocean - Part I. The Alcyonaceans of the Deep Sea. Trustees of Indian Museum, Culcutta, 132pp.

Thomson, J.A. & J.J. Simpson (1909). An Account of the Alcyonarians Collected by the Royal Indian Museum Survey Ship – Investigator in the Indian Ocean - part II: The Alcyonarians of the Littoral area. Trustees of Indian Museum, Calcutta, I-XVIII, 1–39, 9pls.

Tursch, B. & A. Tursch (1982). The soft coral community on a sheltered reef quadrat at Laing Island (Papua New Guinea). Marine Biology 68(3): 321–332.

Venkataraman, K., R. Jeyabaskaran, K.P. Raghuram & J.R.B. Alfred (2004). Bibliography and Checklist of Coral and Associated Organisms of India. Zoolological Survey of India, Occasional Paper no. 226, 468pp.

Vennam, J. & L.P. van Ofwegen (1996). Soft corals (Coelenterata: Octocorallia: Alcyonacea) from the Laccadives (SW India), with a re-examination of Sinularia gravis Tixier-Durivault, 1970. Zooogische. Mededelingen Leiden 70(29): 437-452, figs. 1–13.

Verseveldt, J. (1978). Alcyonaceans (Coelenterate: Octocorallia) from some Micronesian Islands. Zooogische. Mededelingen Leiden 5: 49–55.