Journal of Threatened Taxa | www.threatenedtaxa.org | 26 August
2019 | 11(10): 14358–14362
First
record of two rare brachyuran crabs: Drachiella morum Alcock, 1896
and Quadrella maculosa Alcock,
1898 along the Tamil Nadu coast, India
Chinnathambi Viswanathan 1,
Sampath Goutham 2, Vijay Kumar Deepak
Samuel 3, Pandian Krishnan 4, Ramachandran Purvaja 5 &
Ramachandran Ramesh 6
1–6 National Centre for Sustainable
Coastal Management, Ministry
of Environment, Forest and Climate Change,
Anna University Campus, Chennai, Tamil Nadu 600025, India.
1 drcvishwanathan@gmail.com,
2 taaz_goutham@yahoo.co.in, 3 deepakocean@gmail.com, 4
krishnanars@yahoo.com (corresponding author), 5 purvaja.ramachandran@gmail.com,
6 rramesh_au@yahoo.com
Abstract: The
present report describes the first record of two brachyuran crabs, Drachiella morum Alcock, 1896 and Quadrella
maculosa Alcock,
1898 along the coast of Tamil Nadu, India.
The morphological characters of the specimens are described and
discussed. Among the two crabs, Q. maculosa was previously
recorded only in the Andaman & Nicobar Islands.
Keywords:
Crab, Drachiella morum, morphological characters, Quadrella maculosa.
doi: https://doi.org/10.11609/jott.3076.11.10.14358-14362
|
ZooBank: urn:lsid:zoobank.org:pub:C723677B-544A-4EB9-A01A-D0D635337ACB
Editor:
A. Biju Kumar, University of
Kerala, Thiruvananthapuram, India. Date of publication: 26 August 2019
(online & print)
Manuscript
details: #3076 | Received 30
September 2016 | Final received 01 May 2019 | Finally accepted 31 July 2019
Citation: Viswanathan, C., S. Goutham, V.K.D. Samuel, P. Krishnan, R. Purvaja
& R. Ramesh (2019). First record of two rare brachyuran crabs: Drachiella morum Alcock, 1896 and Quadrella maculosa Alcock, 1898 along the
Tamil Nadu coast, India. Journal of Threatened Taxa 11(10):14358–14362. https://doi.org/10.11609/jott.3076.11.10.14358-14362
Copyright: © Viswanathan et al. 2019. Creative Commons Attribution 4.0 International
License. JoTT
allows unrestricted use, reproduction, and distribution of this article in any
medium by adequate credit to the author(s) and the source of publication.
Funding: National Centre for Sustainable Coastal Management, Ministry of Environment, Forest and Climate Change, Chennai.
Competing interests: The authors declare no competing interests.
Acknowledgements: The study was undertaken as a part of the National Project on Mapping
Ecologically Sensitive Areas (ESA) in India, supported by the Ministry of
Environment, Forest and Climate Change, Government of India. The authors thank Dr. R. Soundararajan, Scientific
Consultant, National Centre for Sustainable Coastal Management, Chennai for
reviewing the manuscript.
In recent years, biodiversity research has gained
significant momentum owing to the decline of flora and fauna worldwide. Reporting the occurrence of a rare species
is, thus, very important in order to update the country’s biodiversity
database. The brachyuran crabs of the
family Aethridae Dana, 1851 is a small group with 37
species under seven genera worldwide (Davie & Fransen
2015). Some members of the Aethridae (Actaeomorpha and Drachiella) have
long been associated with the family Leucosiidae (Ng
et al. 2008). The family Trapeziidae Miers, 1886 are known
as obligate commensals of corals throughout the Indo-Pacific and eastern
Pacific regions (Castro et al. 2004). Trapeziidae has 43 species belonging to three subfamilies
and seven genera (Davie & Türkay 2009). Both Aethridae and Trapeziidae are least studied from Indian waters since only
three species of aethrids and nine species of trapezids are known from India. Previously, aethrids
were reported in 1896 and 1934 (Alcock, 1896; Chopra,
1934); thereafter, no additional observation from the Indian coast has been
made in the scientific reports, whereas a few trapezids
were reported from Rameshwaram and Andaman Islands (Alcock 1898; Sankarankutty 1961, 1962,
1966; ZSI 2012).
In the present study, we report an Aethridae
crab, Drachiella morum and a Trapeziidae crab
Quadrella maculosa for the first time from Tamil Nadu, southeastern
coast of India. The former was
previously recorded in Odisha (Alcock 1896) and West
Bengal (Chopra 1934) and the latter was reported only in the Andaman Islands (Alcock 1898; ZSI 2012).
Materials and Methods
During the field survey, one crab belonging to the
species, D. morum (female) from Kasimedu fishing harbour and two
crab individuals belonging to the species, Q. maculosa (male, female) from Kottivakkam
fish landing centre of Tamil Nadu, southeastern coast
of India, were collected. The former was
collected from a trawl bycatch while the latter was collected from a gill
net. Species identification of the
collected specimens was made by following the descriptions of Alcock (1896, 1898) and Galil (1986). The collected specimens were deposited in the
Marine Biological Regional Centre (MBRC), Zoological Survey of India (ZSI),
Chennai.
Order Decapoda Latreille, 1802
Family Aethridae Dana, 1851
Genus Drachiella Guinot, in Serène & Soh, 1976
Drachiella morum Alcock, 1896 (Image 1)
Synonyms: Holotype. Actaeomorpha
morum Alcock 1896:
172–173. pl. VIII, fig. 3; Ihle, 1918: 308.
Actaeomorpha morum Chopra 1934: 480–481; Edmonson 1935: 20; Sakai 1937: 116, text-fig. 13, 1965: 35,
pl. 15, fig. 3; Serene 1954: 458, pl.
7 and text-fig. 1,2; Zarenkov 1969: 16, fig. 1(1); Takeda & Miyake 1970: 218.
“Aff. Oreophorus”
morum, Guinot 1966:
757.
Oreophorus rugosus Yokoya 1933, not O. rugosus Stimpson 1858; vide Takeda & Miyake (1970).
Type locality: Ganjam coast, India (Alcock 1896).
Materials examined:
MBRC/Reg No: D1-511, 07 September 2015, 1 female, from trawl net hauled
at a depth of 20–30 m, and landed at Chennai Kasimedu
fishing harbor, Bay of Bengal, Tamil Nadu, India, coll. Goutham
Sampath.
Measurements: Carapace width 10.7mm; carapace length 8.6mm
(details in Table 1).
Description: Carapace
broader than long, quite oval. The
entire surface of the body and appendages are closely covered with vesiculous granules.
The carapace as a whole is segmented and isolated into regions from a
broad marginal ring by sculptured groves; a narrow bridge alone connecting the
front to the gastric regions. The
segmented regions are elegantly isolated from each other by a) two
obliquely-longitudinal channels that cut off the acutely triangular
gastro-cardiac region from the reniform branchial regions, and b) a transverse
channel that cuts off the semi-oval intestinal region – the channels being all
connected to the marginal ring.
The orbits are spherical and are entirely closed out from the antennulary fossettes, the infra-orbital lobe being in
close contact with the frontal lobes. The basal antennal segment
is fused with the infra-orbital lobe, but the antennal flagellum is
distinct. The chelipeds and legs are
closely crowded with large granules. The
carpus and propodus are covered with spiniform granules. Merus in the
last pair of legs is also spiniform on the posterior
region.
Colour: Orange brown colour in
fresh specimen.
Distribution: India: Odisha and West Bengal (Alcock 1896), Tamil Nadu, India (present study); Japan (Yokoya 1933): Misaki (Sakai 1937), Sagami Bay (Sakai 1965),
Kii Nagashima and Tosa Bay (Sakai 1976); East China Sea (Takeda & Miyake
1970a); South China Sea (Dai & Yang 1991); Vietnam, Thailand and
Philippines (Serène & Vadon
1981; Chen 1989).
Remarks: Drachiella morum was first reported as Actaeomorpha
morum by Alcock (1896).
Later, Guinot (1966) removed the species from Actaeomorpha and
classified it under Oreophorus. Serene &
Sow (1976) however, included the species under Drachiella
with clear illustrations. Drachiella was long
associated with the family Leucosiidae (Ng et al.
2008).
Order Decapoda Latreille, 1802
Family Trapeziidae Miers, 1886
Genus Quadrella Dana, 1851
Quadrella maculosa Alcock, 1898 (Image 2)
Synonyms:
Holotype. Quadrella coronata var. maculosa Alcock, 1898: 226
Quadrella coronata var. maculosa Alcock & Anderson,
1899, figures 2, plate 38.
Quadrella maculosa Rathbun, 1911: 235; Guinot
1967: 285; Serene 1968: 89; Garth 1969: 188; Serene 1973a: 204, figures 4, 9,
20–22, plate 3; 1975: 513; Serene et al. 1974: 24; Serene 1984: 288, figure
194, plate 41, figure E; Galil 1986c: 285, figures 5 C–F; Galil and Clark 1990:
372; Allen & Steene 1994: 162; Colin &
Arneson 1995: 214, figure 1007.
Quadrella cyrenae Ward 1942: 45, figures 5,6, plate 3; Michel
1964: 30; Guinot 1967: 275.
Type locality: The Andaman Islands, India (Alcock 1898).
Materials examined:
MBRC/Reg No: D1-512, 04 January 2016, 1 male, and 1 female gill net, Kottivakkam fish landing centre,
Bay of Bengal, Tamil Nadu, India, coll. Goutham
Sampath.
Measurements: Carapace width 4.8mm (male), 4.5mm (female);
carapace length 3.8mm (male), 3.9mm (female) (details in Table 1).
Description: Carapace
hexagonal, slightly wider than long; anterior margin with conspicuous
triangular, teeth-like lobes. Polygonal
markings in carapace and propodus of chelipeds. Epibranchial spine prominent, projecting outward. Chelipeds are massive. Merus little
shorter than the carapace, and strongly granulate on anterior margin; with
eight lateral spines on each cheliped. Carpus short, rounded, prominent
anterior spine on interior margin. Chelipeds 1.5x longer than carapace length,
distended, tuberculate, tubercles increasing in size posteriorly, giving the
posterior margin a serrate appearance.
First ambulatory leg more than twice carapace’s length.
Fourth ambulatory dactyl with 16 triangular teeth on posterior margin,
proximally diminishing in size. Propodus and dactylus are hairy on each walking leg.
Colour: Light brown in fresh specimen.
Distribution: Red Sea; Gulf of Aden; Kenya; Madagaskar-Tuléar and south coast; Nosy Bé
and Tuléar; Seychelles; Amirante
Islands; Réunion; Mauritius; Cargados Carajos Islands; Maldives; Sri Lanka - Gulf of Mannar; Andaman Islands; Japan - Kuroshima,
Yaeyama-retto; Taiwan; Philippines - Golo Island; Palau; Indonesia - Kepulauan
Aru and Kai, Kepulauan Kai, Kepulauan
Aru and Geelvinck Bay, New, Makassar Strait and Auri Island, Irian Jaya; Papua New Guinea - Madang; New
Caledonia; Vanuatu; Marquesas Islands - Fatu Hiva (MSIP 2016).
Remarks: Quadrella maculosa can be differentiated from other species of Quadrella by
a) having slender and long walking legs b) having a clear epibranchial spine
that projects from each side of the carapace and c) merus
of a cheliped that is armed with acute tubercles (Castro 1997).
Discussion
The brachyuran crab, Drachiella morum, was first reported as Actaeomorpha
morum by Alcock
(1896). He recorded two females (10mm
CW, 12mm CL) at 28 to 30 fathoms off the Ganjam
coast, Bay of Bengal, India during the “Investigator” expedition.
Later, a single female (12.5mm CW, 10mm CL) specimen was recorded in the
mouth of the Hoogly River, West Bengal, India at
>20 fathoms (Chopra 1934).
Thereafter, no additional observations from the Indian coast were made
in any scientific reports. Like D. morum, Q.
maculosa was also first reported by Alcock (1896) from the Andaman Islands. Later, in the 1980s, scientists from the Zoological
Survey of India reported its presence from the same region (ZSI 2012). Until now, there are no records from the
coasts of mainland India. The specimens
collected in the present study agree well with the original descriptions and
illustrations of both D. morum and Q. maculosa.
The present study reports D. morum
for the first time on the Tamil Nadu coast, and its presence revealed that it
has been reported after eight decades from the Indian coast. The crabs belonging to the genus Quadrella
Dana, 1851 are commensal with anthozoans and were collected at a depth range
between 20–150 m. They are mostly
obtained by bottom trawling or dredging (Shih & Mok
1996). The present specimen, Q. maculosa, was taken
from the trash of gill net hauled at 30m depth, and the specimens (a male and a
female) were collected attached to gorgonians.
The report of Q. maculosa from Tamil Nadu coast reveals that its distribution
range extends from the Andaman Islands to the mainland coast of India.
Though these species do not contribute towards
commercial fishery, they might serve as food for other organisms and their
larvae might also be consumed in the food web (Viswanathan et al. 2013). Moreover, Quadrella species
have a commensal relation with soft corals where they feed on the lipid-rich
coral mucus, and the crab reciprocates by cleaning and protecting the coral
polyp from predators. Rediscoveries and extension of species distribution help
in the biodiversity documentation for future monitoring and management practices.
Table 1. Morphometric characters of the identified
crabs (mm).
Characters |
Drachiella morum (n = 1) |
Quadrella maculosa (n = 2) |
Carapace length |
8.6 |
3.8, 3.9 |
Carapace width |
10.7 |
4.8, 4.5 |
Frontal width |
1 |
2.1, 2.2 |
Posterior width of carapace |
2.5 |
2.7, 2.9 |
Merus length |
2.3 |
2.9, 2.8 |
Merus width |
1.2 |
1.1, 1.3 |
Carpus length |
1.1 |
0.8, 0.8 |
Carpus width |
0.9 |
0.5, 0.5 |
Propodus length |
2.8 |
5.4, 5.3 |
Propodus width |
1.3 |
1.4, 1.5 |
Dactylus length |
1.2 |
1.3, 1.3 |
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