Journal of
Threatened Taxa | www.threatenedtaxa.org | 26 September 2018 | 10(10):
12432–12433
First
record of Hislopia malayensis Annandale, 1916 (Bryozoa:
Gymnolaemata) from freshwaters of India
Ananta Dnyanoba Harkal 1 & Satish Sumanrao
Mokashe 2
1 Department of Zoology, New
Arts, Commerce and Science College, Ahmednagar,
Maharashtra 414001, India
2 Department of
Zoology, Dr. Babasaheb Ambedkar
Marathwada University, Aurangabad, Maharashtra
413004, India
1 harkalananta@gmail.com, 2 mokashe2@gmail.com
(corresponding author)
doi: https://doi.org/10.11609/jott.3400.10.10.12432-12433 | ZooBank:
urn:lsid:zoobank.org:pub:CCF70CCE-36A8-461B-A42A-C07ED5FD986F
Editor: Timothy S. Wood, Wright State University, Ohio, USA. Date of
publication: 26 September 2018 (online & print)
Manuscript details: Ms # 3400 |
Received 08 March 2017 | Final received 07 September 2018 | Finally accepted 10
September 2018
Citation: Harkal, A.D. & S.S. Mokashe (2018). First
record of Hislopia malayensis
Annandale, 1916 (Bryozoa: Gymnolaemata)
from freshwaters of India. Journal of Threatened Taxa 10(10): 12432–12433; https://doi.org/10.11609/jott.3400.10.10.12432-12433
Copyright: © Harkal & Mokashe 2018. 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: University Grants Commission (UGC).
Competing interests: The authors declare no competing interests.
Acknowledgements: We are thankful to the University Grants Commission
(UGC) for providing a grant under MRP and Prof.
Timothy Wood, Right State University, USA for providing the literature.
Freshwater
bryozoans are the representatives of periphytic or aufwuch community.
They grow on underwater substrata which may be living
or nonliving. Bryozoan colonies have
multiple subunits, known as zooids. In
India Annandale (1911), Rao (1992) and Shrivastava (1981) made significant contribution to this
fascinating phylum but further studies are obligatory to understand the real
picture of diversity, distribution and the ecology of bryozoans in India.
Class Gymnolaemata includes five freshwater families from which
the family Hislopiidae is represented by a single
genus, Hislopia, with seven described
species. Till date, only Hislopia lacustris
Carter, 1858 and Hislopia monoliformis Annandale, 1907 have been documented from
India. This is the first report on the
occurrence of Hislopia malayensis
Annandale, 1916 from the fresh waters of India.
Formerly the species was only reported from Thailand
by Annandale (1916) and Wood et al. (2006), as well as from Cambodia by Hirose
& Mawatari (2007). It was initially described by Annandale
(1916) from a small lake near Yala in Patani Province, Thailand where collections were made in
1901. Again in 2006 Wood et al. (2010)
collected it from the same locality.
Wood et al. (2006) reported it again from several sites across Thailand
and described it as the “most frequently encountered freshwater bryozoan in
Thailand”.
Material
and Methods: The colonies were collected from Visapur
Dam (19032’N & 74052’E) and Mula
Dam (1900’N & 74034’E) Ahmednagar
District and Mombatta Lake (19057’N &
75015’E) of Aurangabad District Maharashtra State, India. All kinds of hard submerged
substrata were examined and colonies were observed under binocular dissection
microscope in live condition. The
colonies were also maintained in the laboratory as described by Wood (2005) for
observing growth patterns.
Result
and Discussion: The species is identified by the description provided by
Annandale (1916) and Wood et al. (2006).
The colonies are flat and zooids radiate in all directions. Zooids are broadly oval, with a wide zone of
contact between the daughter zooids. The
old zooids are brownish in color while the newly formed ones are transparent
(Image 1B). Unlike H. lacustris spines are absent around the opening of
zooid, the orifice and the presence of distal expansion (Image 1C–E), which
later on develops as a daughter zooid.
This expansion is a transparent tube, which later starts expanding from
the tip and moves back towards the parental zooid (Image 1F–H). The distal expansion has a ball like cell
mass, becomes spindle-shaped, which possibly forms all the internal organs of
the daughter zooid during the development.
This distal expansion with spines absent around the
orifice of the zooids are the diagnostic characters of H. malayensis (Annandale 1916; Wood et al. 2006). In a fully grown
colony, the digestive tract is of saffron color, with milky white peristome and a transparent ectocyst.
The
colonies are abundant at all sites especially at Mula
Dam where each and every submerged substratum, even the plastic boat used to
catch fish is densely covered by the colonies.
They are observed on rocks, twigs, plastic bottles glass (Image 1A), and
clothes present in the water like H. lacustris,
which is a common freshwater bryozoan across several sites of Maharashtra
State.
Conclusion:
According to Timothy S. Wood (pers.
comm. 2015) there
is no serious work on this genus and one has to understand the phenotypic
plasticity and molecular taxonomy amongst the species to know the variation and
exact number of species in the genus.
This report points out the need to undertake further studies on the
diversity and distribution of these fascinating animals in India.
References
Annandale,
N. (1911). Freshwater Sponges, Hydroids and Polyzoa, Fauna of British India. Taylor
and Francis, London, 161–238pp.
Annandale,
N. (1916). Zoological
results of a tour in the Far East. Polyzoa,
Entoprocta and Ctenostomata.
Memoirs of the Asiatic Society of Bengal 6: 15–37, pl.
1, 2.
Hirose, M. & S.F. Mawatari
(2007). Freshwater Bryozoa
of Tonle Sap, Cambodia. Zoological
Science 24: 2723–2729.
Rao, K.S.
(1992). Freshwater Ecology (Bryozoa). Anmol Publication, New Delhi,
308pp.
Shrivastava, P.
(1981). Swarupella new genus ectoprocta Phylactolaemata
from India. Bioresearch (Ujjain) 53–56.
Wood, T.S. (2005).
Study methods for freshwater
Bryozoan. Denisia 28: 103–110.
Wood,
T., P. Anurakpongsatorn & J. Mahujchariyawong
(2006). Freshwater bryozoans of
Thailand (Phylactolaemata, Gymnolaemata
and Entoprocta). The
Natural History Journal of Chulalongkorn University
6(2): 81–117.
Wood,
T., P. Anurakpongsatorn & J. Mahujchariyawong
(2010). An Introduction to the
Freshwater Bryozoans of Thailand. Kasetsart University Press,
Thailand, 142pp.