A
divergent population of Hemidactylus frenatus Duméril & Bibron, 1836 (Reptilia: Gekkonidae)
from the northern Eastern Ghats, India
S.M. Maqsood Javed 1,
C. Srinivasulu 2, K. Lakshmi Rao 3, T. Raseswari 3 &
Farida Tampal 4
1,4 World Wide Fund for Nature-India
(WWF), APSO, 818, Castle Hills, Road No. 2, Near NMDC, Vijayanagar Colony,
Hyderabad, Andhra Pradesh 500057, India
2 Wildlife Biology Section,
Department of Zoology, University College of Science, Osmania University,
Hyderabad, Andhra Pradesh, 500007, India
3 Centre for Cellular and Molecular
Biology (CCMB), Uppal Road, Hyderabad, Andhra Pradesh 500007, India
Email: 1 javedwwf2007@gmail.com
Date of publication (online): 26 September
2010
Date of publication (print): 26 September 2010
ISSN 0974-7907 (online) | 0974-7893 (print)
Editor: Aaron Bauer
Manuscript details:
Ms
# o2388
Received
18 January 2010
Final
received 02 June 2010
Finally
accepted 29 July 2010
Citation: Javed, S.M.M., C. Srinivasulu, K.L. Rao, T. Raseswari & F.
Tampal (2010). A divergent population of Hemidactylus frenatus Duméril & Bibron,
1836 (Reptilia: Gekkonidae) from the northern Eastern Ghats, India. Journal of Threatened Taxa 2(10): 1205-1213.
Copyright: © S.M. Maqsood Javed, C. Srinivasulu, K. Lakshmi Rao, T.
Raseswari & Farida Tampal 2010. Creative Commons
Attribution 3.0 Unported License. JoTT allows unrestricted use of this
article in any medium for non-profit purposes, reproduction and distribution by
providing adequate credit to the authors and the source of publication.
Author Details: Mr. S.M. Maqsood Javed is a Senior Field Researcher cum
Education Officer. His interest lies in biodiversity studies with special
emphasis on arachnofauna and herpetofauna.
Dr. C. Srinivasulu is Assistant Professor in Department
of Zoology. He is the head of the research laboratory at Osmania University
that focuses on biodiversity inventorying, conservation, ecology and animal
taxonomy with special reference to Eastern Ghats and Godavari River basin in
Andhra Pradesh.
Dr. K. Lakshmi Rao is working as a Scientist. She has been associated with
Chromosomal diagnostics services. Her group research activities focus on
reproductive disorders. She has established primary cell lines from reptiles
especially from various Indian snakes and crocodiles whichwere subsequently characterized cytogenetically.
Ms. T. Raseswari is a Technical Assistant, under Dr. K. Lakshmi Rao and works on
cytogenetics.
Ms. Farida Tampal is State Director of the Andhra
Pradesh State Office of World Wide Fund for Nature – India. She is
interested in understanding the biodiversity of the Eastern Ghats with special
emphasis on arachnofauna and herpetofauna.
Author Contribution: SMMJ, CS and FT conducted the field surveys; SMMJ and CS
identified and wrote the paper; KLR and TR performed chromosome analysis.
Acknowledgements: The authors are very much thankful to Shri Hitesh Malhotra, IFS,
Principal Chief Conservator of Forest (Wildlife) and Chief Wildlife Warden,
Andhra Pradesh, Dr. R. Hampaiah, Chairman and Dr. V.B. Ramana Murthy, Member
Secretary, Andhra Pradesh Biodiversity Board for constant support and
encouragement. SMMJ and FT express gratitude to Shri Anil Kumar V. Epur,
Chairman, WWF-AP State Committee, Hyderabad and Shri Ravi Singh, Secretary
General & CEO, WWF-India, New Delhi for constant support and encouragement.
We express our thanks to Shri Swaranjit Sen, IPS (Retd.), Chairman, Shri B.
Venkatesham, IAS, Managing Director and Shri P.V. Ramana Reddy, IFS, Executive
Director, Andhra Pradesh Tourism Development Corporation, Hyderabad for
constant support and permitting us to conduct biodiversity studies in APTDC
Eco-tourism sites. CS thanks Prof. T. Tirupathi Rao, Vice Chancellor, Osmania
University and the Head, Department of Zoology, Osmania University, Hyderabad
for encouragement and facilities. We are thankful to Dr. Lalji Singh for
helping us to use the karyotyping facility in CCMB, Hyderabad. We are very much thankful to Dr.
Hidetoshi Ota, Dr. George Zug, Mr. Varad Giri, Mr. Stephen Mahony, Mr. Zeeshan A Mirza for reviewing the first draft of
manuscript, constructive suggestions and sharing literature. Dr. Bhargavi
Srinivasulu, Mr. R. Sreekar, Mr. M. Seetharamaruju and Ms. Harpreet Kaur of
Department of Zoology, Osmania University assisted in taking morphological and
morphometric data. Lastly, we would like to thank Mr. P.S.M. Srinivas, Manager
Corporate for exploring new places and all the WWF-Staff of APSO, Hyderabad for
their constant support and timely suggestions.
Abstract: A population of Hemidactylus cf. frenatus Duméril & Bibron, 1836, was
recorded from Tyda and its vicinity in the Ananthagiri Hills, northern Eastern
Ghats, Vishakhapatnam District, Andhra Pradesh,
India. Evaluation of morphometric
and meristic characters supported by karyotyping revealed that populations from
the Ananthagiri Hills are considerably different from other populations of H. frenatus occurring in India. We provide the detailed description of
the male of this divergent population.
Keywords: Ananthagiri Hills, Andhra Pradesh, divergent population, Hemidactylus cf. frenatus, karyotype.
For figures, images & table -- click here
INTRODUCTION
The
genus Hemidactylus Oken, 1817, belongs to the second most species-rich lizard family
in the world, Gekkonidae, with 100 species being described till date (Pough et
al. 2000; Carranza & Arnold 2005; Krysko & Daniels 2005; McMahan &
Zug 2007; Giri 2008; Giri & Bauer 2008; Giri et al. 2009; Mahony 2009; Uetz
2010). The genus Hemidactylus is distributed over large parts of
tropical Asia, Africa, Mediterranean Europe and the Americas. It has been observed that a great
majority of representatives of Hemidactylus geckos are restricted in distribution and confined to southern
Asia and Africa, with only eight species namely H. brookii, H. bowringii, H. flaviviridis, H. frenatus, H. garnotii, H. persicus, H. mabouia and H. turcicus colonizing most of the geographical extent of this genus (Kluge
1969; Carranza & Arnold 2005). In India, Hemidactylus is represented by 24 recognized species [validity of H. mahendrai and H. subtriedrus questioned by Zug et al. (2007)
and as per Mahony & Zug (2008) distribution of H. karenorum in India is doubtful] (Smith 1935;
Sharma 1981; Shukla 1983; Bauer & Russell 1995; Giri 2008; Giri & Bauer
2008; Giri et al. 2009; Mahony 2009; Vyas et al. 2006). Recently, four species, namely, Hemidactylus aaronbaueri Giri, 2008; Hemidactylus gujaratensis Giri et al., 2009; Hemidactylus sataraensis Giri & Bauer, 2008; Hemidactylus treutleri Mahony, 2009 were described from
India (two species from Maharashtra and one species each from Gujarat and
Andhra Pradesh). From the state of
Andhra Pradesh alone 11 species represent the genus Hemidactylus (Murthy 1986; Rao et al. 2005;
Srinivasulu & Das 2008; Mahony 2009).
While
conducting faunistic surveys in Tyda (18013’N & 83002’E)
(Image 1), which is a part of the Ananthagiri Hills, northern Eastern Ghats of
Andhra Pradesh, we came across a population of Hemidactylus cf. frenatus. A detailed examination of the external morphology revealed
disagreement with some characters between this population and those often
referred to H. frenatus in India. In the
present paper we report the discovery of a morphologically and chromosomally
divergent population of the H. frenatus species complex from the northern
Eastern Ghats, Andhra Pradesh, India.
Natural History: Tyda is a well known tourist destination
in the Ananthagiri Hills, Andhra Pradesh (Image 1). Hemidactylus cf. frenatus specimens were collected from a shelter room and a kiosk in front
of the Tyda railway station (Image 2). We also observed that this species is wide spread throughout the
Ananthagiri Hills. Mostly, it is
active during the night, but on a number of occasions we sighted individuals on
tree trunks (Mangifera indica, Tamarindus indica and Tectona grandis) at
3-5 m height during the day. Generally this gecko is commensal and found on walls near artificial
lighting in groups of 3-5 individuals and in August 2009 we also recorded 2-5
juveniles along with them. Gravid
females were recorded in February and July and possessed two eggs (Image 5
& 6). Populations of the taxon
were found sympatrically with H. brookii, H. leschenaultii and Hemidactylus cf. maculatus.
MATERIALS & METHODS
A
specimen of gecko encountered near Tyda Railway Station was collected and photographed. Another three specimens were collected
from different places in Tyda, Araku and Ananthagiri. Further surveys revealed this species to be common among the
human dwellings in the study area. After extracting tissue for karyotyping from two males, all four
specimens (ZSI/FBRC/V–1521–1524) (3 males and 1 female) were euthanized, fixed in 10%
formalin, preserved in 70% alcohol and deposited in the collection of the
Zoological Survey of India, Fresh-water Biology Regional Center, Vertebrate
section (ZSI/FBRC/V), Hyderabad. Photo vouchers (PV) are deposited in the Natural History Museum, Osmania
University, Reptilia section, Hyderabad
(NHM.OU.REP). Specimens were
identified based on the descriptions and keys available in the literature
(Jerdon 1853; Boulenger 1890; Rooij 1915; Smith 1935; Loveridge 1947; Kluge
& Eckardt 1969; Darevsky et al. 1984; Wells & Wellington 1985; Ota
1989; Ota & Hikida 1989; Sharma 2002; Wells
2002; Giri et al. 2003; Giri & Bauer 2006; McMahan & Zug 2007; Zug et
al. 2007; Giri 2008; Giri & Bauer 2008; Mahony 2009). Karyotyping was done following Ota
& Hikida (1989) and Rao & Aswathanarayana (1979) in the Centre for Cellular and
Molecular Biology (CCMB), Hyderabad. Each animal was injected intraperitoneally with colcemid. After approximately 2hr the animal
was sacrificed. Bone marrow from
the femur and tibia was aspirated and suspended in hypotonic solution for 45
min at 280C. Cells were
then fixed with acetic alcohol: methanol (1:3) and centrifuged. The cells were
refixed with fresh fixative for 30 minutes, dried on slides, and stained with
Giemsa. Comparative material was examined
at the Zoological Survey of India, Kolkata (ZSIK) by the second author.
Morphological
and meristic studies were conducted in the Department of Zoology, Osmania
University, Hyderabad. All measurements were taken following Zug et al. (2007) and
Giri & Bauer (2008) with Mitutoyo digital calipers (to the nearest 0.1 mm):
snout-vent length (SVL; from tip of snout to vent), trunk length (TRL; distance
from axilla to groin measured from posterior edge of forelimb insertion to
anterior edge of hind limb insertion), body width (BW; maximum width of body),
crus length (CL; from base of heel to knee); tail length (TL; from vent to tip
of tail), tail width (TW; measured at widest point of tail); head length (HL;
distance between retroarticular process of jaw and snout-tip), head width (HW;
maximum width of head), head height (HH; maximum height of head, from occiput
to underside of jaws), forearm length (FL; from base of palm to elbow); orbital
diameter (OD; greatest diameter of orbit), nares to eye distance (NE; distance
between anteriormost point of eye and nostril), snout to eye distance (SE;
distance between anterior most point of eye and tip of snout), eye to ear
distance (EE; distance from anterior edge of ear opening to posterior corner of
eye), internarial distance (IN; distance between nares), interorbital distance
(IO; distance between left and right supraciliary recorded at the center).
Meristic counts and external observations of morphology were made using a
dissecting microscope.
RESULTS
Reptilia: Squamata: Gekkonidae
Hemidactylus cf. frenatus
Material Examined: 1 male (ZSI/FBRC/V–1521) and 1 female (ZSI/FBRC/V–1522), 8.xii.2009, 18013’N & 83002’E,
Tyda; 1 male (ZSI/FBRC/V–1523),10.xii.2009, 18014’N
& 83000’E, Ananthagiri Village; 1 male (ZSI/FBRC/V–1524),12.xii.2009, 18019’N
& 82052’E, Araku Town, Vishakhapatnam District, Andhra Pradesh,
India, coll. S. Aatram & C. Ramana.
Other sources: Photo vouchers deposited at the Natural History Museum, Osmania
University. Three photo vouchers
(male/female/female: NHM.OU.REP.PV.7/8/9–2009), locality details same as above; 1
photo voucher (female: NHM.OU.REP.PV.10–2009), H. frenatus, Hyderabad,
Andhra Pradesh.
Description of Hemidactylus cf. frenatus from northern Eastern Ghats,
Andhra Pradesh
The Hemidactylus cf. frenatus population from Tyda is
distinguished from all the other populations of H. frenatus reported from India by the
following suite of characters: maximum 13 supralabials (vs. maximum 12 supralabials); dual set
of outer postmentals separated by two scales in a longitudinal row from
infralabials or rarely in contact (vs.outer postmentals always in contact with infralabials); a maximum of six
scansors beneath digit I of pes (vs.a maximum of 5 scansors); 10–17 femoral pores on each side separated at mid-pelvic region by 3–4 non-pored scales [vs. continuous
series of 23–36 femoral pores, or separated at
mid-pelvic region by 1–2 non-pored scales (1–2 non-pored scales only reported from Myanmar populations H. frenatus) (Smith 1935; Zug et al. 2007)]
(Images 15, 15a, 19 & 20); conspicuous ventrolateral body fold present on
trunk and thigh (vs. no ventrolateral body folds present on trunk and thigh)
(Image 8); all digits of manus and pes distinctly webbed at the base (vs.
slightly webbed or no webbing at the base); distal end of digital pads much
wider than proximal end (vs. distal end of digital pads slightly wider than
proximal end); tail moderately denticulate at lateral edge (vs. not denticulate
at lateral edge).
Description of Male (ZSI/FBRC/V–1521): A
medium sized gecko (SVL 60.9mm). Head relatively short and robust (HL/SVL ratio 0.22), with distinct
broadening at position of jaw angles (HW/HL ratio 0.86), without snout
elongation (SE/HW ratio 0.58) and overall depression (HH/HL ratio 0.53). Loreal region and canthus rostralis
slightly inflated. Interorbital and forehead region slightly concave; snout
obtusely pointed; longer than eye diameter (OD/SE ratio 0.54); scales on snout
and forehead large, rounded, granular and juxtaposed; scales on snout larger
than those on occipital region; small scales on occipital region intermixed
with larger, smooth granular scales (Images 11 & 12) . Interorbital scales between supraciliaries ~51. Eyes
large (OD/HL ratio 0.27); pupil vertical and broad with crenulated margin;
supraciliaries small, pointed, those at the anterior end of orbit slightly
larger; ear-opening deep, oval, vertical and large, ears lacking lobules; eye
to ear distance greater than diameter of eye (EE/OD ratio 1.39) (Image
12). Rostral scale quadrangular,
much wider (2.2mm) than deep (1.1mm), slightly notched by suture dorsomedially,
in contact with nostril, first supralabial and supranasal; supranasals
separated by two scales in a longitudinal row (Image 11); nostril circular, in
contact with rostral, one enlarged supranasal, two postnasals, of which the
posterior is larger; mental triangular, larger than postmentals; two pairs of
postmentals, primary pair larger, in contact with each other, mental,
infralabials and secondary postmental; secondary postmental pair small,
separated and half the size of the primary postmentals, lying posterior to the
primary postmentals and separated from infralabials by single row of scales
(Image 9); orbit separated from supralabials by three scale rows; supralabials
(to midorbital position) 8 (right)/8 (left) and supralabials (to angle of jaw)
13 (right)/13 (left); infralabials (to angle of jaw) 10 (right)/10 (left)
(Image 12).
Body
moderately elongated (TRL/SVL ratio 0.51) (Image 3), dorsoventrally flattened
with conspicuous ventrolateral furrow. Dorsal scales small, granular, heterogeneous, juxtaposed, intermixed
with regularly arranged, relatively large, round, smooth tubercles arranged in
a longitudinal rows on the dorsolateral region, extending from the middle of
the trunk (Image 13) to the base of tail; scales more or less uniform across
dorsum and flanks; mid body scales around trunk ~96. Ventral scales much larger
than dorsals, smooth, flat, roundish lozenge-shaped, a bit larger on
mid-abdomen than near axilla and groin; mid body scales across belly ~44; gular
region with much smaller, uniform and granular scales. Femoral pores 14 on each
side, separated at mid-pelvic region by three non-pored scales (Image 15). Distinct, but slight cutaneous folds
present on the posterior border of hind limbs. Manus and pes possess large, smooth and flat scales on the dorsal
region, while ventrolateral region possess small, smooth and flat scales.
Posterior half of the thigh on ventral side (posterior to femoral pore row)
possesses very small, smooth and granular scales.
Limbs
moderately long; digits long, moderately dilated, bearing scansors and clawed;
forelimbs slender and short (FL/SVL ratio 0.12) in comparison with hindlimbs
(CL/SVL ratio 0.15); all digits of manus and pes indistinctly webbed at the
base (Images 16 & 17), terminal phalanx of all digits curved, arising
angularly from distal portion of expanded lamellar pad. Scansors beneath digits
I-V of manus (undivided + deeply notched or divided + entire apical)
(right/left): 5 (2+3+1)/5 (2+3+1), 7 (1+5+1)/7 (1+5+1), 8 (2+5+1)/8 (2+5+1), 9
(2+6+1)/9 (2+6+1), 8 (3+4+1)/8 (3+4+1); beneath digits I-V of pes (right/left):
6 (2+3+1)/6 (3+2+1), 8 (2+5+1)/8 (2+5+1), 9 (2+6+1)/9 (2+6+1), 10 (3+7+1)/10
(3+7+1), 8 (2+5+1)/8 (2+5+1) (Image 16 & 17). Relative length of digits (measurements
in mm in parentheses): IV (3.8) > V (3.1) > III (3.4) > II (3.3) >
I (1.6) (right manus); IV (5.1) > V (5) > III (3.6) > II (3.4) > I
(1.8) (right pes).
Tail
moderately depressed, oval in cross section, relatively short, original portion
35.9mm, regenerated from 14th segment (terminal 12mm regenerated);
postcloacal hemipeneal bulge indistinct; two small postcloacal spurs present,
posterior larger than anterior; regenerated portion of tail with uniform,
smooth, flattened dorsal scales. Original tail bears fourteen caudal segments;
caudal segmentation distinct, possesses 9–11 rows of small, granular, slightly overlapping heterogeneous
scales intermingled with six large, smooth, pointed scales arranged
transversely (Image 14) and slanting posteriorly on the dorsum of each segment;
median subcaudal series possesses smooth scales, transversely enlarged and each
much wider than long; scales on postcloacal region and at proximal part of tail
base slightly overlapping, larger than dorsal scales on tail (Image 15);
lateral edge of tail distinctly denticulate, each caudal bearing a single,
large, pointed, conical scale near the posterior margin and, anterior to this,
three small, pointed, conical scales on original portion (size of scales
gradually decreases anteriorly) (Image 14) and no such serration on regenerated
portion.
Colouration: In life, dorsum yellowish-gray, slightly darker on distal half of
digits; indistinct light spots white or creamy white in colour on body and
limbs; venter of head, body, original portion of tail, and most of limbs lemon
yellow; subdigital regions and regenerated portion of tail light
yellowish-brown (Images 3 & 4). In alcohol, dark gray colour pattern on
dorsum and lemon yellow colour on ventral completely faded; numerous irregular
black pigment spots present on almost every scale of the body, limbs and tail.
Variation: All other specimens (Images 5, 7 & 8) observed differed
significantly from the described male only in colouration in life and placement
of enlarged tubercles arranged in longitudinal rows on the dorsolateral
region. One specimen (ZSI/FBRC/V–1523) has 12 supralabials on the
right side and two enlarged scales between the secondary postmentals. The
number of femoral pores on each side and general morphometry also varied (Table
1). Thirty-two individuals were
examined during the survey, of which six were recorded as possessing secondary
postmentals in contact with the infralabials (Image 10). The range of femoral
pores in adult males on each side 10–17, separated at mid-pelvic region by 3–4 non-pored scales (Images 15 &
15a). No femoral pores are present in females (Image 20) and two postcloacal
spurs are present in both the sexes, but more prominent in males.
Karyotype
Two
male specimens were used for karyotyping and no variation was observed. Based on 12 well spread metaphase
cells, the karyotype of Hemidactylus cf. frenatus from Tyda consists of 40 chromosomes of different sizes (Image
21). There were no sharp
differences between macrochromosomes and microchromosomes. No heteromorphic
chromosome pairs were recognized. The karyotype (Image 22) is arranged in pairs mainly on the basis of
varying sizes noted in the captured metaphases. All chromosomes have acrocentric appearance (A- shaped rods
graded to dots) and among them 2 were large in size, 18 medium and 20
small. Other species of the genus Hemidactylus (H. brookii, H. frenatus and H. flaviviridis) also have this same number of chromosomes, but differs from
those of Hemidactylus cf. frenatus in size and morphology [H. brookii = 4V (metacentric) + 36A (acrocentric rods graded to dots), H. frenatus = 2V (metacentric) + 4SV
(submetacentric) + 34A (acrocentric: probably 26A + 2V + 6SV) rods graded to
dots and H. flaviviridis = 2V (metacentric) + 4SV (submetacentric) + 34A (acrocentric:
probably 26A + 2V + 6SV) rods graded to dots] (Kluge & Eckardt 1969,
Darevsky et al. 1984; Ota & Hikida 1989). Along with this, on the basis of
chromosome number, H. bowringii (2n = 46), H. garnotii (2n = 3x = 42; 2n
= 3x = 63; 2n = 3x = 70), H. flaviviridis (2n = 46) and even some
populations of H. frenatus (2n = 46* in error; 2n = 3x = 60) (Das & Ota 1998) are
considerably differentiated from the population of Hemidactylus cf. frenatus from Tyda. Details
of chromosome numbers of Hemidactylus species found in India (derived from Das & Ota 1998) are
provided in Table 2.
Distribution
At
present this population of Hemidactylus cf. frenatus is only known from the Tyda and its surroundings (Araku and
Ananthagiri) in the northern Eastern Ghats, Andhra Pradesh, India.
DISCUSSION
The
Common House Gecko, H. frenatus is native to South and Southeast Asia, and the Indo-Australian
Archipelago, but has since been widely introduced throughout many tropical and
subtropical regions (Bauer & Henle 1994). Its range currently includes countries in eastern Africa,
Madagascar, many of the islands of the South Pacific, Hawaii, Mexico, central
America, and the United States (Rooij 1915; Bauer & Henle 1994; Case et
al. 1994; Vences et al. 2004). Recent molecular phylogeny studies for genus Hemidactylus (Carranza & Arnold 2005)
revealed that H. frenatus belongs to Tropical Asian clade and one southern Indian population
of H.
frenatus shows
high genetic variability (10% divergence) from Myanmar. This discovery of a morphologically
divergent population from Ananthagiri Hills probably reflects genetic
differentiation, as was also shown by the karyotypic data [2n = 40 chromosomes
(all acrocentric)]. Further
investigation with the help of DNA sequence data may be useful in
differentiating hidden lineages in this cryptic species complex.
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Material compared
Hemidactylus frenatus. Andhra Pradesh: ZSIK-24225 (08.ix.1984, D.P. Sanyal, Kaleswar
locality, Kareemnagar District), ZSIK -24648 & 24652 (21 & 23.i.1988,
D.P. Sanyal, Kothakota locality, Mehaboobnagar District), ZSIK-23586
(22.ii.1978, A.P. Survey, Kotpalli locality, Adilabad District), ZSIK-23700
(15.ii.1979, A.P. Survey, Macharam locality, Mehaboobnagar District); Assam:
ZSIK-24334 (29.iii.1986, S.S. Saha, Manus Tiger Reserve, Kamrup District);
Bihar: ZSIK-24449 (14.iv.1986, S. Ahamad, Manihari locality, Katihar District);
Karnataka: ZSIK-22658 (14.ix.1973, A. Laxminarayana, Mysore District); Orissa:
ZSIK-22958 (14.xi.1971, D.P. Sanyal, Gopalpur locality, Gunjam District); West
Bengal: ZSIK-24128 (29.iii.1984, S.S. Saha, Tantipara, Birbhum District).