A first report of
symbiotic polychaete Scale Worm Gastrolepidia clavigera Schmarda, 1861
(Phyllodocida: Polynoidae) from Lakshadweep Archipelago, India
Thangapandi Marudhupandi
1, Thipramalai Thangappan Ajith Kumar 2, Sanjeevi Prakash
3, Mohan Gopi 4 & Thangavel Balasubramanian 5
1,2,3,4,5 Centre of Advanced Study in
Marine Biology, Faculty of Marine Sciences, Annamalai University, Porto Novo,
Tamil Nadu 608502, India
Present address: 2 National Bureau of Fish Genetic Resources
(ICAR), Canal Ring Road, Dilkusha Post, Lucknow, Uttar Pradesh 226002, India
3 Centre for Climate Change Studies,
Sathyabama University, Jeppiaar Nagar, Rajiv Gandhi Salai, Chennai, Tamil Nadu
600119, India
1 tmarudhu@gmail.com, 2 ttajith87@gmail.com,
3 prakash.s1311@gmail.com (corresponding author), 4 gpsakthi@gmail.com,
5 stbcas@nic.in
doi: http://dx.doi.org/10.11609/JoTT.o3092.6385-8
| ZooBank: urn:lsid:zoobank.org:pub:3B06F767-2729-4395-A520-EBC7D162E37A
Editor: Robin
Wilson, Museum Victoria, Melbourne, Australia Date
of publication: 26 September 2014 (online & print)
Manuscript details: Ms #
o3092 | Received 10 September 2012 | Final received 23 May 2014 | Finally
accepted 10 August 2014
Citation: Marudhupandi,
T., T.T.A. Kumar, S. Prakash, M. Gopi & T. Balasubramanian (2014). A first report of symbiotic polychaete Scale Worm Gastrolepidia clavigera Schmarda,
1861 (Phyllodocida: Polynoidae) from Lakshadweep Archipelago, India. Journal
of Threatened Taxa 6(10): 6385–6388; http://dx.doi.org/10.11609/JoTT.o3092.6385-8
Copyright: © Marudhupandi et al. 2014. 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 Earth Sciences,
Government of India under the project entitled “Development of technologies for
hatchery
production of ornamental fishes at Lakshadweep :
Sea ranching and technology transfer to coastal and island communities”
Competing Interest: The
authors declare no competing interests.
Acknowledgements: The
authors are grateful to their Dean, Faculty of Marine Sciences and the
authorities of Annamalai University for the facilities provided. This work was supported by the Centre
for Marine Living Resources and Ecology (CMLRE), Ministry of Earth Sciences,
Government of India.
For figures,
images -- click here
The
fact that symbiotic polychaete species are assigned to have commensal
association with other marine invertebrates is a common phenomenon. The effects of a symbiont on their hosts
determine the type of their interactions and many of these associations are
poorly understood since their study requires much time and effort (Britaev
& Lyskin 2002). Martin &
Britaev (1998) describe 375 species of symbiotic polychaetes with 294
considered as commensal and 81 said to be parasitic. More than 50 species of symbiotic
polychaetes belong to the family Polynoidae, which are commonly occurring
medium-sized scale worms (Fauchald 1977).
In
the present study a survey for commensal scale worms was confined to the
intertidal area (eastern side) of Agatti Island, Lakshadweep during the months
of September and October 2011. In
total, 52 belt transects (50x10 m) were positioned between high and mid tidal
regions with a distance of 100m among each of the transects. The individuals of symbiotic polychaete Gastrolepidia
clavigera Schmarda (Image 1a,b) were counted by observing from the body
surface of the hosts dorsally, central and near the oral cavity. The holothurian host was less abundant
in the low tidal region due to rocky areas and hence, the survey was restricted
to the middle and southeastern side of the Agatti Island where sandy substrates
were more common. Underwater
documentations were done by an Olympus camera (µTough series) over the depth
ranges from 0–1.5 m. Worms
were often found in pairs and associated with a variety of holothurians
belonging to the families Holothuridae and Stichopodidae. The worms were
clinging to the anterior or posterior end of the host body, but when disturbed
they tended to hide inside the oral cavity of the host. The size of worms was measured in
millimeters (total length in mm) and the host was measured in centimeter (total
length in cm). Host holothurians
were identified using field guides (Allen & Steene 2000) and worm specimens
were identified using Hanley (1989), Britayev et al. (1999) and Barnich et al.
(2004). Description and coloration
of the symbiotic worm G. clavigera was based on the recently collected
specimens and further used for taxonomic identifications. The samples were preserved in 5–10
% sea water formalin and deposited in the Marine Biological Regional Centre
(MBRC), Zoological Survey of India (ZSI), Chennai, Tamil Nadu.
Order Phyllodocida Dales,
1962
Suborder Aphroditiformia
Levinsen, 1883
Family Polynoidae Malmgren,
1867
Genus Gastrolepidia Schmarda,
1861
Gastrolepidia clavigera Schmarda, 1861 (Image 1 A,B;
Fig.1 A–E)
Material examined: MBRC/ZSI M1-64,
11 individuals, 22.x.2011, TL 11–24 mm, intertidal area (eastern side),
Agatti Island, Lakshadweep (10050’39.80”N & 72011’16.85”E),
coll. T. Marudhupandi & S. Prakash.
Diagnostic characters: Body flattened, tapering
anteriorly and posteriorly up to 36 segments, scute-like processes at the base
of each parapodium. Elytra large,
smooth and soft without papillae, overlapping medially and posteriorly (Fig.
1A). Elytron with pouch on anterior
margin. Prostomium bilobed and
wider, without cephalic peaks, palps short and tapering gradually to a filiform
tip. Ceratophores of median antenna
large and truncated in anterior notch, style smooth, basally cylindrical and
expanding to large bulbous subterminal inflation and lateral antenna distinct,
shorter and smaller, terminoventrally on distal ends of prostomium.
Tentacular
segments not visible, tentaculophores lateral to prostomium with two pairs of
dorsal and ventral tentacular cirri, smooth and similar to median antenna.
Parapodia subbiramous (Fig. 1B).
Notopodium small and flattened with acicular lobe. Neuropodium deeply cut dorsally and ventrally
forming a long and thin presetal lobe and short and blunt postsetal lobe. Dorsal cirri withour elytra expanding
into large subterminal inflation and form filiform tip. Ventral cirri shorter and gradually form
filiform tip. Ventral lamellae large
and conspicuous at the bases of parapodia.
Notosetae
(Fig. 1C) long and slightly curved with serrations on the outer margin with
notched tips. Neurosetae (Fig. 1D)
long and straight with rows of serrations at the outer egdes with notched tips;
middle (Fig. 1E) and lower neurosetae short and stout, slightly curved with a
few rows of serrations and unindentate tips.
Distribution: Gastrolepidia clavigera
has a circumtropical distribution throughout the Indo-Pacific (Hanley 1993;
Martin & Britayev 1998), the South China Sea, Xinsha Islands (Wu et al.
1975), southern Vietnam (Britayev & Zamishlyak 1996) and Hainan Island
(Meng et al. 1993; Barnich et al. 2004).
In Indian waters it has been recorded from Rameswaram (Fauvel 1941) and
Andaman and Nicobar Islands (Tampi & Rangarajan 1964; Tikader et al.
1986). This species has been
reported for the first time from Agatti Island, Lakshadweep.
Remarks: Potts (1910) was the first
to recognize the association between G. clavigera and the
holothurians. Gibbs (1969, 1972)
provided a list of holothurian hosts and suggested that the ventral lamellae
might be an adaptation to life on a holothurian, allowing the worms to cling by
suction to their hosts.
Nearly
26 species of holothurians have hitherto been recorded from Lakshadweep waters
(James 1989) of which 11 species were recorded during the present survey. The G. clavigera was mainly found
in abundance when associated with three species of holothurians: Holothuria
atra, Holothuria sp. (Holothuridae) and Stichopus chloronotus (Stichopodidae). The maximum length of the host was
measured as 42.2, 27.8 and 22.5 cm respectively. The remaining host species (Bohadschia
argus, Actinopyga mauritiana and Holothuria nobilis) were rarely
seen during the survey with worm as a commensal. One further holothurian species in this
region is Synaptus sp. (Synaptidae), which does not host any symbiotic
worm on its body surface (personal observation by TM, SP and MG during the
survey).
In
total, 55 host individuals were observed for the presence of symbiotic worm and
31 individuals were holding G. clavigera in a commensal relationship. Holothuria atra (12 of 23), Holothuria
sp. (13 of 18) and Stichopus chloronotus (6 of 14) (Fig. 2),
respectively. Percentage (%)
occurrence of symbiotic worm G. clavigera on these three host species
were calculated. The maximum
occurrence was on Holothuria sp. (41.9%) followed by H. atra
(38.7%), suggesting that the surface area of the host may play a vital role in
the distribution of these symbiotic worms on the body surface. Whereas a low % occurrence on S.
chloronotus (19.3%) is due to the lesser body surface of the host species
(Fig. 3), in rare occasions, more than two worms were noticed in Holothuria
sp. including juveniles of 8mm and 11mm in total length.
Both
parasitic feeding on the host’s tissues and predatory behavior are characteristic
of G. clavigera, which makes up a complex system of interactions between
the polychaete and their host holothurians (Britaev & Lyskin 2002). Both field and experimental studies are
required to study the interactions between these symbionts and their hosts.
References
Barnich, R., D. Fiege & R. Sun (2004). Polychaeta (Annelida) of
Hainan Island, South China Sea Part III Aphroditoidea. Species Diversity
9: 285-329
Britayev, T.A. & E.A. Zamishlyak (1996). Association
of commensal scale worm Gastrolepidia clavigera (Polychaeta: Polynoidae)
with holothurians near the coast of South Vietnam. Ophelia 45:
175–190;
http://dx.doi.org/10.1080/00785326.1996.10432470
Britayev, T.A., G. Doignon & I. Eeckhaut (1999). Symbiotic polychaetes from
Papua New Guinea associated with echinoderms, with descriptions of three new
species. Cahiers de Biologie Marine 40: 359–374
Britaev, T.A. & S.A. Lyskin (2002). Feeding of the Symbiotic
Polychaete Gastrolepidia clavigera (Polynoidae) and Its Interactions
with Its Hosts. Doklady Biological Sciences 385: 352–356; http://dx.doi.org/10.1023/A:1019964918471
Fauchald, K. (1977). The Polychaete
Worms-Definitions and Keys to the Orders, Families and Genera. Nat Hist Mus Los Angeles
County. Science series 28, 198pp
Fauvel, P. (1941). On a small collection of Annelida Polychaeta of the Indian Museum,
Calcutta. Records of Indian Museum, Zoological Survey of India, Calcutta
42: 253–268
Gibbs, P.E. (1969). Aspects of Polychaete ecology with particular reference to
commensalism. Philosophical Transactions of the Royal Society of London, B
Biological Sciences 255: 443–458;
http://dx.doi.org/10.1098/rstb.1969.0020
Gibbs, P.E. (1972). Polychaete annelids from the Cook Islands. Journal of Zoology,
London 168: 199–220; http://dx.doi.org/10.1111/j.1469-7998.1972.tb01347.x
Hanley, J.R. (1989). Revision of the scale-worm genera Arctonoe Chamberlin and Gastrolepidia
Schmarda (Polychaeta, Polynoidae) with the erection of a new subfamily
Arctonoinae. The Beagle, Occasional Papers of the Northern Territory Museum
of Arts and Sciences 6: 1–34.
Hanley, J.R. (1993). Scaleworms (Polychaeta: Polynoidae) of Rottnest Island, Western
Australia, pp. 203–236. In: Wells, F.E., D.I. Walker, H. Kirkman & R.
Lethbridge (eds.). Proceedings of the fifth International Marine Biological
Workshop. The Marine Flora and Fauna of Rottnest Island, Western Australia.
Western Australian Museum, Perth.
James, D.B. (1989). Echinoderms of Lakshadweep and their zoogeography, 93–149.
In: Marine Living Resources of the Union Territory of Lakshadweep. CMFRI
Bulletin 43.
Martin, D. & T.A. Britayev (1998). Symbiotic polychaetes:
review of known species. Oceanography and Marine Biology Annual Review
36: 217–340
Meng, F., X. Hong & B. Wu (1993). Studies on the polychaeta of
Hainan Island waters I. Journal of Oceanography of Huanghai and Bogai Seas 11(4):
45–63
Potts, F.A. (1910). Polychaeta of the Indian Ocean - part 2. The Palmyridae,
Aphroditidae, Polynoidae, Acoetidae, Sigalionidae. Transactions of the
Linnean Society of London, Series 2 Zoology 16(2): 325–353.
Tampi, P.R.S. & K. Rangarajan (1964). Some polychaetous annelids
from the Andaman waters. Journal of Marine Biological Association of India
6(1): 98–123
Tikader, B.K., A. Daniel & N.V. Subbarao (1986). Sea Shore Animals of Andaman
and Nicobar Islands. The
Director, Zoological Survey of India, Kolkata 188pp.
Wu, B., S. Shen & M. Chen (1975). Preliminary report on
polychaetous worms from the Xinsha Islands, Guand dong Province, China. Studia
Marina Sinica 10: 65–104 (in Chinese with English abstract)