Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 March 2023 | 15(3): 22850–22858
ISSN 0974-7907
(Online) | ISSN 0974-7893 (Print)
https://doi.org/10.11609/jott.7827.15.3.22850-22858
#7827 | Received 11
January 2022 | Final received 06 September 2022 | Finally accepted 03 March
2023
A new termite species of the
genus Bulbitermes (Blattodea:
Isoptera: Termitidae) from
Meghalaya, India
Khirod Sankar Das 1 & Sudipta
Choudhury 2
1,2 Entomology Laboratory, Department
of Zoology, North-Eastern Hill University, Shillong,
Meghalaya 793022, India.
1 khirodsankar@gmail.com, 2 sudiptanehu@gmail.com
(corresponding author)
Abstract: A new termite species, Bulbitermes debadiliporum
sp. nov., of the nasutiform
genus Bulbitermes is described here
from the Mawlynnong area of the East Khasi Hills
district and Nongkhrah Village of the Ri-Bhoi district of Meghalaya, India. The species is described
based on the soldier & worker castes, and a detailed illustration of the
diagnostic characteristics of both the castes is provided here. Soldiers of the
species are monomorphic whereas the workers are dimorphic with worker major and
worker minor. Worker dimorphism is reported hitherto for the first time among Bulbitermes species of the Indian region.
Furthermore, an updated identification key of Bulbitermes
species from the Indian region is also provided here.
Keywords: Bulbitermes debadiliporum sp. nov.,
Indian region, key, Mawlynnong area, morphometrics, Nasutitermitinae, soldier, taxonomy, worker major, worker
minor.
ZooBank: urn:lsid:zoobank.org:pub:A3675F53-0F11-4BE9-9A56-B3EF043DDC15
Editor: K. Rajmohana,
Zoological Survey of India, Kolkata, India. Date of publication: 26 March 2023 (online
& print)
Citation: Das, K.S. & S. Choudhury (2023). A new termite species of the genus Bulbitermes (Blattodea: Isoptera: Termitidae) from
Meghalaya, India. Journal of Threatened Taxa 15(3): 22850–22858. https://doi.org/10.11609/jott.7827.15.3.22850-22858
Copyright: © Das & Choudhury 2023. Creative Commons Attribution 4.0 International License. JoTT allows
unrestricted use, reproduction, and distribution of this article in any medium
by providing adequate credit to the author(s) and the source of publication.
Funding: University Grants Commission, New Delhi.
Competing interests: The authors declare no competing interests.
Author details: Mr. Khirod Sankar Das was a research scholar in the Department of Zoology, North-Eatsern Hill University, pursuing his PhD. He worked on termites diversity and distribution in different land-use types of Meghalaya, India and also in sensory structures of termites. Currently, his is working as an assistant professor in the Department of Zoology, Assam Don Bosco University, Tapesia,
Assam, India. Dr. Sudipta Choudhury is an assistant professor, in the Department of Zoology, North-Eastern Hill University, Shillong and works in insect systematics and sensory structures particularly in the order-Blattodea, Coleoptera, Lepidoptera and Hymenoptera.
Author contributions: KSD—first author was involved in data collection, data analysis and
manuscript preparation; SC—corresponding author was involved in supervision of whole study.
Acknowledgements: We would like to extend our
gratitude to the head, department of Zoology, NEHU, Shillong
for providing all the necessary facilities to carry out this work. We are
thankful to the UGC, New Delhi for providing fellowship under the NFSC (vide-
F1-17.1/2017-18/RGNF-2017-18-SC-ASS-35335) scheme to K.S. Das. We are also
grateful to Rodeson Thangkhiew,
Graham Rani, and J. Nongdhar for their assistance
during sample collection.
INTRODUCTION
Termites
are widely spread group of insects that fall under the infra-order Isoptera and order Blattodea
(Inward et al. 2007; Krishna et al. 2013a). Worldwide, around 2,933 living
species of termites have been reported under 282 genera that belong to nine
families (Krishna et al. 2013a). Family wise Termitidae
is the largest among all the families and comprises of 2,077 species globally
that belong to seven subfamilies. Among the subfamilies, Nasutitermitinae
is the second largest with around 77 genera and 596 species reported from all
over the seven biogeographic regions of the world (Krishna et al. 2013a). Nasutitermitinae group inhabits a variety of ecological
conditions with diverse nesting and feeding habits (Eggleton
2000).
The genus Bulbitermes is the third largest genus (in
species diversity) under the subfamily Nasutitermitinae
and is endemic to the Oriental region (Chhotani 1997;
Krishna et al. 2013a). It is a dead wood or plant material feeding nasutiform genus (Chuah 2005; Syaukani & Thompson 2011). This genus is similar to
genus Hospitalitermes with constricted
head behind antenna, mandibles with spine like processes and with more than 12
antennal segments in soldier castes. But the genus Bulbitermes
differ from Hospitalitermes with
comparatively less constricted head behind the antenna, mandibles with slightly
shorter spine like processes and with hind legs not extending beyond the
abdomen in soldiers (Chhotani 1997). The genus Bulbitermes comprises of 33 species. The
Indian region (India, Bangladesh, Pakistan, Sri Lanka, Bhutan, Nepal, and
Burma) houses four Bulbitermes species,
viz., B. pyriformis Akhtar, 1975 (From Bangladesh), B. prabhae, Krishna, 1965 (From Burma), B. bulbiceps Maiti & Saha, 2000 (from Assam, India), and B. parapusillus Ahmad, 1965 (from Meghalaya, India)
(Krishna et al. 2013b).
In this paper, we describe a new Bulbitermes species, Bulbitermes
debadiliporum sp. nov.,
based on its monomorphic soldier and dimorphic worker (worker major and minor)
castes from Meghalaya, India.
MATERIALS AND METHODS
The samples used in this study
were collected from the betel nut plantation of Mawlynnong
area, Pynursla, East Khasi Hills district and Nongkhrah village, Nongpoh, Ri-Bhoi district of Meghalaya, India. The collection was done
using brush and forceps or handpicking and was preserved at 80% alcohol in the
laboratory for further studies. All the type specimens (Holotype &
Paratypes) of this study are deposited in the national repository of Zoological
Survey of India at the North Eastern Regional Centre, Shillong
(ZSI, NERCS), Meghalaya, India. Voucher specimens are preserved in the research
collection of entomology laboratory, Department of Zoology, North-Eastern Hill
University (NEHU), Shillong, Meghalaya, India.
Leica Stereo Zoom microscope
S8AP0 fitted with GT 5.0 camera and mosaic V.2 photographic software was used
to take the micrographs of the samples. Measurements were taken on the
micrographs using Image J software (2018 version) and were also cross checked
with the ocular micrometer fitted with the microscope.
Morphological studies of the
soldier and worker castes and also all measurements, terminologies and indices
were based on Roonwal & Chhotani
(1989). Identification of the species was done following the available
literature of Ahmad (1965), Chhotani (1997), and Syaukani & Thompson (2011).
RESULTS
Taxonomic account
Infra-order: Isoptera
Brullé, 1832
Family: Termitidae
Latreille, 1802
Subfamily: Nasutitermitinae
Hare, 1937
Genus: Bulbitermes
Emerson, 1949
Bulbitermes debadiliporum
sp. nov.
urn:lsid:zoobank.org:act:88A317EB-2F8C-4E13-A012-C80AABCEC97D
(Images 1–9)
Type materials
Holotype: I/ISOP/ERS/4431, Soldier,
20.xii.2018. The holotype was collected from a carton nest from the betelnut plantation of Mawlynnong
area of Pynursla, East Khasi Hills District of
Meghalaya, India (25.2047°N, 91.9112°E; elevation 530 m), coll. K.S. Das;
deposited in ZSI, NERCS.
Paratypes: I/ISOP/ERS/4432: 17 soldiers and
7 workers (5 workers major and 2 workers minor), same data as holotype.
Other materials studied: ISOP/ZOO/NEHU/100: 18 soldiers
and 3 workers major, 20.vi.2018. Collected from dry bamboo plant, Nongkhrah village, Nongpoh, Ri-Bhoi district, Meghalaya, India (25.9270°N, 91.8917°E;
elevation 587 m), coll. K.S. Das and party; preserved in the Department of
Zoology NEHU, Shillong. ISOP/ZOO/NEHU/120: 21
soldiers and 8 workers major, 17.x.2018 and ISOP/ZOO/NEHU/121: 12 soldiers,
17.x.2018, samples collected from the same area as mentioned above by same
collector and preserved in Department of Zoology, NEHU, Shillong.
Description
Imago: Unknown
Soldier (Images 1–9, Table 1): Monomorphic. Head is pear shaped
without rostrum and slightly constricted behind antennae. In colouration, head brown to rusty brown (in middle &
posterior portion) to dark smoky brown (in anterior portion and lateral
posterior ends). In dorsal profile, head weakly depressed behind rostrum,
faintly concave, posterior margin roundly convex, two long bristles present on
posterior end of head capsule. Fontanelle gland and tube visible. Rostrum
cylindrical and darker than head with reddish-brown (proximal portion) to dark
reddish-brown (distal portion) in colour. Tip portion
with four long bristles and somewhat hyaline at end. Rostrum length usually
more than the half of head length without rostrum and in some cases less than
or equal to ¾ of head length without rostrum. Mandible vestigial with prominent
long apical processes. Length of spine like apical processes slightly varies
among the soldiers and right mandible without any minute tooth. Antennae
generally 14 segmented (sometimes 13 segmented) and yellowish-brown to brown in
colour. Segments vary in length. In 13 segmented
ones, 2nd shortest, 3rd twice as long as 2nd,
3rd longer than 4th and 5th, 5th
longer than 4th. In 14 segmented ones, 2nd shortest or
subequal to 3rd, 4th longer than 3rd
(sometimes 3rd longer than 4th). Pronotum saddle shaped,
indistinctly emarginated anteriorly and posteriorly. In colour,
pale brown to brown. Anterior lobe darker than posterior and minute hairs
present on anterior margin. Legs pale brown to straw in colour.
Abdominal tergites pale brown in colour with long
bristles on posterior tergites; sternites
brownish-yellow in colour with long and short
bristles.
Worker: Dimorphic. Worker major
(Images 10–19; Table 2): Head subsquarish
in shape; light brown with yellowish tinge to dark brown in colour
and fairly pilose. Epicranial Y-suture distinct.
Fontanelle plate prominent, oval. Postclypeus
swollen, hairy and divided into two equal halves by the median suture. In length,
less than half of its width. Antennae pale yellow to pale yellowish brown in colour and 14–15 segmented. In 14 segmented ones, 4th
shortest, 2nd subequal to 3rd or longer than 2nd
and 3rd. In 15 segmented ones, 3rd shortest or subequal
to 4th, 2nd longer or subequal to 4th.
Mandibles with apical and 2–3 marginal teeth. Left mandible with prominent
apical and 3 marginal teeth. Apical tooth and 1st marginal tooth
form an acute angle between them. Posterior margin of 1st marginal
slightly sinuate. Second and third marginal teeth small and prominent. Third
marginal slightly longer than second and separated by wide U-shaped gap from
molar prominence. Molar plate with four prominent ridges. Right mandible with 1
apical and 2 marginal teeth. Apical and first marginal teeth slightly boarder
than left mandible ones. Apical tooth and 1st marginal tooth form an
obtuse angle between them. Second marginal tooth small, with a blunt apex,
posterior edge nearly straight. Molar plate with 10 well developed prominent
ridges. Inner layer of molar plate undeveloped and proximal notch of molar
plate weakly developed. Thorax pale yellowish in colour.
Pronotum saddle shaped, faintly emarginated at anterior and indistinctly
emarginated at posterior. In colouration, light brown
to brown and slightly lighter than colour of head.
Anterior lobe darker than posterior and minute hairs present on anterior margin
along with two long bristles on lateral sides each. Legs straw in colour. Abdominal tergites pale brown in colour with long bristles only on posterior tergites; sternites brownish-yellow in colour
with long and short bristles.
Worker minor (Images 20–28; Table 2): Similar
with worker major but smaller in size. Antenna only 14 segmented, 4 shortest, 2
subequal to 3 or longer than 3. Mandibles with apical and 2–3 marginal teeth,
smaller in size than worker major. Apical and first marginal teeth less pointed
than in worker major. Left mandible with apical and 3 marginal teeth,
prominent. Apical tooth slightly shorter than 1st marginal tooth
with an acute angle between them. Posterior margin of 1st marginal
slightly sinuate. Second and third marginal small and prominent. Second
marginal tooth broader than the left mandible ones of worker major. Third
marginal slightly longer than second and separated by V-shaped gap from molar
prominence. Molar plate with four prominent ridges. Right mandible with 1
apical and 2 marginal tooth. Apical tooth shorter and pointed than the 1st
marginal and form an obtuse angle between them. Second marginal tooth small
with a blunt apex, posterior edge nearly straight. Molar plate with six well
developed prominent ridges.
Comparison
The termite species Bulbitermes debadiliporum
sp. nov., in its morphological characteristics
and morphometrics (Table 1 and 2) of the soldier and worker castes, shows
slight similarity with other Bulbitermes species
of Indian region (Chhotani 1997), Thailand (Ahmad
1965) and Sumatra (Syaukani & Thompson 2011) but
differ significantly in the key taxonomic characteristics which separate this
species from the rest as a new Bulbitermes species.
Bulbitermes debadiliporum
is closely
related to B. prabhae in its morphological
characteristics. But, the soldiers of B. debadiliporum
have two long hairs on the head prosteriorly
whereas B. prabhae without hairs. Antennae are
14 segmented in B. prabahe where segment 3rd
is longer than 4th whereas 13–14 segmented in B. debadiliporum with segment 3rd shorter than
4th in 14 segmented antennae. No minute inconspicuous tooth observed
below the tip of the apical process of the right mandibles in B. debadiliporum unlike B. prabhae.
Morphometrics of soldier such as head length with and without rostrum, head
width and rostrum length etc. are also vary slightly between the species.
In comparison to B. parapusillus, the head length with rostrum (1.17–1.52
mm), without rostrum (0.78–1.08 mm), head width (0.67–0.88 mm), and rostrum
length (0.53–0.60 mm) of B. parapusillus are
less than B. debadiliporum. Antennae with only
13 segments in B. parapusillus whereas 13–14
segmented in B. debadiliporum. Workers
monomorphic in B. parapusillus with only 14
segmented antenna whereas dimorphic (with worker major and minor) in B. debadiliporum and with 14–15 segmented antenna.
In case of B. pyriformis, the
head length with rostrum (1.28–1.59 mm), head length without rostrum (0.78–0.98
mm) and head width (0.64–0.85 mm) are less in both the upper and lower range
values than B. debadiliporum. Antennae with
12–13 segments in B. pyriformis whereas 13–14 segmented in B. debadiliporum. Pronotum not notched or emarginated at
the anterior and posterior margins in B. pyriformis whereas in B. debadiliporum indistinctly emarginated.
In contrast to B. bulbiceps, the soldier of B. debadiliporum
is larger in size than B. bulbiceps (2.90–3.15
mm). Antennae are with only 12 segments in B. bulbiceps
whereas in B. debadiliporum antennae are
13–14 segmented. Rostrum is shorter in length in B. bulbiceps
(0.42–0.46 mm) than B. debadiliporum. Mandible
without any apical process or tooth in B. bulbiceps
in contrast to the long spine like apical processes of B. debadiliporum. Head length with rostrum (1.10–1.26 mm),
head width at constriction (0.43–0.48 mm), head height (0.46– 0.54 mm), head
width a constriction/ Head width index (0.58–0.60), postmentum
length (0.18–0.21 mm), postmentum width (0.24–0.26
mm), pronotum width (0.30–0.34 mm), pronotum length (0.11–0.12 mm) and head
length (0.76–0.80 mm) of B. bulbiceps are less
than B. debadiliporum. Workers are monomorphic
with 14 segmented antennae in B. bulbiceps whereas
dimorphic (workers major and minor) in B. debadiliporum
with 14–15 segmented antennae. Total body length, head length and width,
pronotum length and width of workers also vary significantly between the
species.
Etymology
The name of this species is given
in the honor of the first authors’ mother Mrs. Deba
Das and father Mr. Dilip Das.
Distribution
India, Meghalaya, East Khasi
Hills District, Pynursla area, Mawlynnong;
Ri-Bhoi District, Nongpoh
area.
Bioecology
Bulbitermes is primarily an arboreal nester
genus that build stercoral carton nest of round or elongate shapes on the tree
trunks, branches or in bushes (Weesner 1965; Lommen et al. 2004). They also live in wood nest (Arumugam
et al. 2018). In case of the species B. debadiliporum,
studied samples were collected from stercoral carton nest found inside the
trunk of dead standing betelnut and dry bamboo. The
trunk of the betelnut plant was eaten up completely
from inside where the carton nest was located and it was somewhat elongated in
shape. In dry bamboo tree, soldiers and workers were found foraging, but could
not locate their nest. Due to their preference to feed on dead wood materials, B.
debadiliporum may fall under the feeding group
II.
DISCUSSION
Bulbitermes debadiliporum sp. nov.
stands as a separate species from other Bulbitermes
species due to its distinct morphological features. The soldier castes of
the species have 13–14 segmented antennae along with significant variations in
other morphological characteristics such as total body length, head length with
and without rostrum, head width, rostrum length, rostrum length and head length
index, head width at constriction, head width at constriction and head width
index, head height, pronotum length and width etc. with other related Bulbitermes species from Indian and other
Oriental regions. On the other hand, the worker caste of the species also shows
distinct morphological features with 14–15 segmented antennae along with its
dimorphic occurrence (workers major and minor). With the differences in number
of antennal segments and morphometrics, workers major, and minor also differ in
their molar plate ridges (10 molar ridges in workers major and 6 in workers
minor) of the left mandibles. Dimorphism among the soldier and worker castes of
Nastutitermitinae is not uncommon as many
genera comprise of dimorphic soldier and worker caste (Chhotani
1997). Bulbitermes species with
dimorphic workers also were reported from Malayasia
earlier. But, among the Bulbitermes species
from Indian region, the dimorphic worker caste is reported for the first time
in B. debadiliporum. Besides, other
morphological characters in worker caste such as head length and width,
pronotum length and width etc. of B. debadiliporum
also vary significantly with other related Bulbitermes
species as discussed above. Thus, we propose this species Bulbitermes debadiliporum
as a new Bulbitermes species from
Meghalaya, India.
Keys to Bulbitermes
species of Indian region based on the soldier caste (modified from Chhotani (1997)
1. Smaller
species (Head length with rostrum 1.10–1.59 mm) …….…………………………………………………………………………….....…………
2
- Larger
species (Head length with rostrum 1.37–2.00 mm) …………………………………………………………………………..…..……….………….…….....
4
2. Antennae
with only 13 segments. Rostrum length 0.53–0.60 mm. Head straight behind
rostrum and with a faint hump in profile.
Mandibles
with short, spine like process …….....…………………………………………………………….………………………… B.
parapusillus (Ahmad)
- Antennae
with 12–13 segments. Spine like process present or absent
……………………………………………………………………...………………….. 3
3. Antennae
with 12–13 segments. Rostrum length 0.70 mm. Head weakly depressed behind
rostrum and with weak hump.
Mandibles
with long spine like process ……………………………………………………………………………………………………......…… B.
pyriformis (Akhtar)
- Antennae with 12 segments; head length with rostrum 1.10–1.26
mm. Rostrum length 0.42–0.46 mm. Head weakly depressed
behind
rostrum and with a weak hump. Mandibles without any spine like process
……………………….…..…..… B. bulbiceps (Maiti and Saha)
4. Antennae
with 14 segments, 3rd longer than 4th. In profile head
depressed behind rostrum appreciably. Right mandible with a
minute
tooth near the tip .....…………………………………………………………………………………………………………..........……
B. prabhae (Krishna)
- Antennae 13–14 segmented; in 14 segmented antennae, segment 4th
longer than 3rd. Head weakly depressed behind rostrum.
Right
mandible without a minute tooth near the tip ……………………………………………………………………... Bulbitermes debadiliporum
sp. nov.
Table 1. Morphometrics (in mm) of
soldiers of the termite species Bulbitermes
debadiliporum sp. nov.
Characteristics |
Holotype |
Range (n = 18) |
Total body length |
3.69 |
3.14–4.70 |
Head length with rostrum |
1.60 |
1.51–2.00 |
Head length without rostrum |
0.93 |
0.87–1.25 |
Head width |
0.85 |
0.75–1.22 |
Head width / Head length without rostrum |
0.91 |
0.86–0.98 |
Rostrum length |
0.67 |
0.61–0.80 |
Rostrum length / Head length
without rostrum |
0.72 |
0.55–0.78 |
Head width at constriction |
0.58 |
0.57–0.69 |
Head width
at constriction / Head width |
0.68 |
0.58–0.78 |
Head Height |
0.66 |
0.55–0.81 |
Pronotum length |
0.22 |
0.18–0.28 |
Pronotum width |
0.46 |
0.42–0.55 |
Postmentum length |
0.35 |
0.27–0.35 |
Postmentum width |
0.31 |
0.28–0.36 |
Table 2. Morphometrics (in mm) of
worker major and worker minor of the termite species Bulbitermes
debadiliporum sp. nov.
Characteristics |
Worker major (n = 5 ) |
Worker minor (n =
2) |
Total body length |
3.20–5.90 |
2.65–2.78 |
Head length |
0.87–1.25 |
0.68–0.74 |
Head width |
1.04–1.40 |
0.74–0.81 |
Pronotum Length |
0.21–0.43 |
0.18–0.27 |
Pronotum width |
0.51–0.77 |
0.41–0.44 |
Postclypeus length |
0.20–0.25 |
0.18–0.20 |
Postclypeus width |
0.50–0.60 |
0.38–0.40 |
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