Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 January 2021 | 13(1): 17529–17536
ISSN 0974-7907 (Online) | ISSN 0974-7893
(Print)
https://doi.org/10.11609/jott.6287.13.1.17529-17536
#6287 | Received 10 June 2020 | Final
received 24 December 2020 | Finally accepted 18 January 2021
On a new species of Macrobrachium
Spence Bate (Decapoda: Palaemonidae) from Ayeyarwady River, Myanmnar
H.H.S. Myo 1 , K.V.
Jayachandran 2 & K.L.
Khin 3
1 Department of Zoology, Lashio
University, Lashio Township, Northern Shan State, Lashio post Office 160101,
Myanmar.
2 Indian Science Congress
Association - Cochin Chapter, Chiraag, S.L. Puram, Cherthala, Kerala 688523,
India.
3 Department of Zoology, Lashio
University, Lashio Township, Northern Shan State, Lashio Post Office 160101,
Myanmar.
1 myohtethtetsaung@gmail.com, 2
jayachandrancmlre@gmail.com (corresponding author),
3 khinlay19742058129@gmail.com
Abstract: Macrobrachium myanmarum sp. nov. was found from near Min
Kun (local name Min Gon) at Mandalay, Ayeyarwady (Irrawaddy) River (22.043N
& 96.043E), Myanmar. It is a
small-sized prawn showing close relation with Arachnochium kulsiense (Jayachandran
et al. 2007) and A. mirabile (Kemp 1917). This species can at once be identified from
both the species by the characters: medium-sized and highly-elevated and arched
rostrum, extending as far as distal segment of antennular peduncle or behind,
upper margin with 11–15 teeth of which three (rarely 4) teeth post-orbital;
ventral margin without teeth (rarely one); second chelate legs unequal, right
leg larger (sometimes left); major leg in which carpus with proximal part
narrow and distal end broadened, subequal to merus, palm and fingers; propodus
slightly more than the combined length of merus and carpus; fingers very
slender, almost equal to palm, fixed finger a bit shorter than movable finger,
cutting edges with 2–6 weak denticles at proximal cutting edges, distal
denticle situated at about 1/3rd distance from base; ischium, merus,
carpus, propodus, palm and dactylus in the ratio 9.62 : 19.25 : 24.06: 47.06 :
23.53 : 23.53, respectively (related to the total length of pereopod); minor
leg with minute tubercles in larger specimens; ischium, merus, carpus,
propodus, palm and fingers in the ratio 13.1 : 23.68 : 22.37 : 40.8 : 15.8 :
25.0, respectively (related to total length of pereopod); palm slightly swollen
and shorter than fingers, fingers slender and curved with a wide gap when
closed. Maximum size recorded for the
species is 56mm male and 44mm female.
Keywords: Identification, Macrobrachium
myanmarum sp. nov., Min Kun, palaemonid prawn.
ZooBank: urn:lsid:zoobank.org:pub:88D5F392-19B7-4671-AC66-61FF0425AE88
Editor: Anonymity
requested. Date of publication:
26 January 2021 (online & print)
Citation: Myo. H.H.S., K.V. Jayachandran
& K.L. Khin (2021). On a new species of Macrobrachium
Spence Bate (Decapoda: Palaemonidae) from Ayeyarwady River, Myanmnar. Journal of Threatened Taxa 13(1): 17529–17536. https://doi.org/10.11609/jott.6287.13.1.17529-17536
Copyright: © Myo et al. 2021. 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: Department of Higher Education,
Ministry of Education, Myanmar.
Competing interests: The authors declare no competing
interests.
Acknowledgements: The authors (HHSM & KLK) are
grateful to Department of Higher Education (Myanmar) for funding this research work,
to Dr Aung Naing Soe, pro-rector and Dr Moe Moe, professor, Zoology Department,
Mandalay University of Distance Education (Myanmar), for permission to carry
out the research work and to our colleagues for their generous help during the
field study.
Taxonomic studies on palaemonid
prawns of Myanmar were carried out by De Man (1888), Henderson (1893), Schenkel
(1902), De Man (1905, 1906), Rathbun (1910), De Man (1911), Kemp (1917, 1918,
1925), Tiwari (1949), Holthuis (1950), Tiwari (1952, 1958), Holthuis (1980),
Naiyanetr (1980), Jayachandran (2001), Cai & Ng (2002), Cai et al. (2004),
Hla Phone & Suzuki (2004), Short (2004), Mie et al. (2009), Wowor & Ng
(2010), Mar & Myint (2014), Khin et al. (2018), and Mar et al. (2018) have
reported 40 species, namely, Arachnochium mirabile (Kemp), Exopalaemon
styliferus (Kemp), Leptocarpus fluminicola (Kemp), Macrobrachium
aemulum (Nobili), M. assamense (Tiwari), M. australiense
M. birmanicum (Schenkel), M. cavernicola (Kemp), M.
clymene (De Man), M. dayanum (Henderson), M. hendersoni
(De Man), M. hildebrandti (H.M.Edwards), M. idella (Hilgendorf),
M. johnsoni Ravindranath, M. joppae Holthuis, M.
josephi Jayachandran, M. lamarrei (H.M.Edwards), M.
lanatum Cai & Ng, M. lanceifrons (Dana), M. lanchesteri
(DeMan), M. lar (Fabricius), M. latidactylus (Thallawitz),
M. latimanus (von Martens), M. malcolmsonii (H.M.
Edwards), M. minutum (J. Roux), M. naso (Kemp), M.
neglectum (De Man), M. nipponense (De Haan), M. palaemonoides
Holthuis, M. pethienense Hla Phone &Suzuki, M. peguense
(Tiwari), M. platyrostris (Tiwari), M. rogersi (Tiwari),
M. rosenbergii (DeMan), M. villosimanus (Tiwari), M.
yui Holthuis, Nematopalaemon tenuipes (Henderson), Palaemon
serrifer (Stimpson), P. sewelli (Kemp), and Palaemonetes
sinensis (Sollaud). The studies
revealed that the fauna of the region is rich and more studies are necessary to
arrive at the exact status of biodiversity.
Recently, a new species has been collected from near Min Gon at Mandalay
region of Ayeyarwady (Irrawaddy) River and is described herein.
Materials and Methods
Seventeen specimens (eight males
and nine females) were collected from Min Kun at Mandalay, Ayeyarwady River
(22°.2’.37”N & 96°.2’.37”E), Myanmar, on 29 July 2018 and 10 June 2020
(Image 1). Holotype deposited at
referral center of Central Marine Fisheries Research Institute (ICAR CMFRI),
Kochi, Kerala, India (CMFRI DNR No. ED.2.2.1.6); 4 females deposited at
Regional Centre of ICAR NBFGR, Kochi, Kerala, India.
The specimens were identified
based on the relevant literature on Palaemonid prawns (De Man 1888; Henderson
1893; Schenkel 1902; De Man 1905,1906; Rathbun 1910; De Man 1911; Kemp 1917,
1918, 1925; Tiwari 1949; Holthuis 1950, Tiwari 1952; 1958; Holthuis 1980;
Naiyanetr 1980; Liu et al. 1990; Jayachandran 2001; Cai & Ng 2002; Cai et
al. 2004; Short 2004; Hla Phone & Suzuki 2004; Komai & Fugita 2005;
Jayachandran et al. 2007; Liu et al. 2007; Mie et al. 2009; Wowor & Ng
2010; Khin et al. 2018).
Infraorder: Caridea Dana, 1852
Superfamily: Palaemonoidea
Rafinesque, 1815
Family: Palaemonidae Rafinesque,
1815
Subfamily: Palaemoninae
Rafinesque, 1815
Genus: Macrobrachium
Spence Bate, 1868
Macrobrachium myanmarum sp. nov.
(Figures 1–3; Image 3)
urn:lsid:zoobank.org:act:7D600155-7A10-4151-A22A-9330AE13AEAD
Synonym: non Macrobrachium
kulsiense Khin et al., 2018.
Materials examined
Holotype: Deposited at ICAR CMFRI
referral museum, Kochi, Kerala, India with registration number - CMFRI DNR No.
ED.2.2.1.6, male, Collected by Dr.H.H.S. Myo & Dr.K.L.Khin from Min Kun at
Mandalay, Ayeyarwady River, Myanmar (22°2’.37”N & 96°2’.37”E) on 29.07.2018
Paratypes: 4 females, Collected
from Min Kun by Dr. H.H.S.Myo & Dr. K.L.Khin on 29.07.2018 at Mandalay,
Ayeyarwady River (22°2’.37”N & 96°2’.37”E), Myanmar has been utilized for
molecular studies at Regional Centre of ICAR NBFGR, Kochi, Kerala, India. Remaining paratypes (males and females)
collected from same locality on 29.07.2018 and 10.06.2020 in the personal
collection of Dr. H.H.S. Myo at Department of Zoology.
Measurements (mm): Holotype
(male): 56.0 TL, 24.0 CL; Paratypes: males 37.0 TL, 15.0 CL; 40.0 TL, 15.0 CL;
41.0 TL, 16.0 CL; 42.0 TL, 16.0 CL; 48.0 TL, 19.0 CL; 50.0 TL, 21.0 CL; 52.0 TL
21.5, CL; 56.0 TL, 24.0 CL; (females): 34.0 TL, 15.0 CL; 37.0 TL, 13.0 CL; 37.0
TL, 13.0 CL; 38.0 TL, 16.0 CL; 39.0 TL, 16.5 CL; 41.0 TL, 18.0 CL; 42.0 TL,
16.0 CL; 42 TL, 17.0 CL; 44.0 TL, 18.0 CL
Etymology: The species
name is in honour of the country from where this new species has been collected
and documented.
Diagnosis
Macrobrachium having the medium-sized,
highly-elevated and arched rostrum, extending as far as distal segment of
antennular peduncle or behind, upper margin with 11–15 of which three (rarely
4) teeth post-orbital; ventral margin generally without teeth (rarely with
one); second chelate legs unequal, right leg larger (sometimes left leg); major
leg in which carpus with proximal part narrow and distal end broadened,
subequal to merus, palm and fingers; propodus slightly more than the combined
length of merus and carpus; fingers very slender, almost equal to palm, fixed
finger a bit shorter than movable finger, cutting edges with 2–6 weak denticles
at proximal cutting edges, distal denticles at about 1/3rd distance
from base; ischium, merus, carpus, propodus, palm and dactylus in the ratio:
9.62: 19.25: 24.06: 47.06: 23.53: 23.53 respectively (related to total length
of pereopod); minor leg with tubercles in large specimens; ischium, merus,
carpus, propodus, palm and fingers in the ratio 13.1: 23.68: 22.37: 40.8: 15.8:
25.0, respectively (related to total length of pereopod); palm swollen and
slightly shorter than fingers
Description
Rostrum medium-sized, extending
as far as distal segment of antennular peduncle or behind, highly elevated and
arched and tip directed forwards (in younger specimens rostrum less elevated),
upper margin with 11–15 teeth of which three teeth (rarely 4) behind the orbit,
proximal most and second teeth more widely separated than the remaining series
teeth of uniform distance between them, proximal six teeth anteriorly directed
and remaining teeth directed upwards, thick and long bunches of setae present
in between teeth; ventral margin curved upwards, one minute tooth in holotype
at the level of 10th dorsal tooth (generally absent); setae longer
and closely set in both upper and lower margins (Figs. 1 A,B Image 2,4)
Carapace generally smooth but
with small tubercles on antero-lateral side, about 43.0 per cent of total
length, orbit sunken, antennal spine sharp, not placed at edge; hepatic spine
sharp; a distinct groove present below hepatic spine, pterygostomian region not
sharp (Figs. 1A,B Image 2,4)
Eyes developed. Telson slender, distal end sharply pointed
and extends as far as or beyond the level of the outer spine of uropodal exopod;
upper margin with two pairs of feeble spines, proximal pair situated at about
53 per cent and not in a line and distal pair closer to proximal pair (76 per
cent), distal end with two pairs of spines, outer pair smaller and inner pair
slender, longer and sharp, eight long plumose setae present in between the
inner pair of spines (Fig. 3B).
Antennular peduncle three
segmented, extends as far as 1/3rd of merus of major second cheliped
and beyond merus of minor second legs, middle segment shortest, antero-lateral
spine of basal segment reaches beyond middle but not to tip of 2nd
segment of antennular peduncle (Fig. 1 D); disto-lateral spine of antennal
scale sharply pointed, subdistal in position and extends just in front of
distal end of merus of 2nd cheliped (Fig. 1E).
First chelate legs slender,
extends up to tip of antennal scale; ischium slightly broader; merus slender;
carpus 1.60 times longer than propodus; palm cylindrical, 1.3 times longer than
fingers; fingers slender, equal sized with tufts of setae on outer margin (Fig.
2B).
Second chelate legs with
tubercles in bigger specimens, unequal, right leg larger (sometimes left);
major leg 1.7 times the size of total length and 2.4 times the size of minor
leg; ischium flat; merus cylindrical; carpus with proximal part narrow and
distal end broadened, subequal to merus, palm and fingers; propodus with
maximum width at distal palm and slightly more than the combined length of
merus and carpus; fingers very slender almost equal to palm, fixed finger a bit
shorter than movable finger, movable finger curved, cutting edges with 2–6 weak
denticles at proximal cutting edges, distal denticle at about 1/3rd
distance from base; ischium, merus, carpus, propodus, palm and dactylus in the
ratio 9.62: 19.25: 24.06: 47.06: 23.53: 23.53, respectively (related to total
length of pereopod) (Fig. 2D, Image 3).
Minor leg with tubercles in larger specimens; ischium, merus, carpus,
propodus, palm and fingers in the ratio 13.1: 23.68: 22.37: 40.8: 15.8: 25.0,
respectively (related to total length of pereopod); palm swollen and slightly
shorter than fingers; fingers slender with a wide gap when closed (Fig. 2C,
Image 3).
Three pairs of non-chelate legs
nearly equal sized, slender, smooth, not reaching beyond antennular scale when
extended, propodus subequal to merus, carpus subequal to dactylus; dactylus
slender sharply pointed, curved distally; ischium, merus, carpus, propodus and
dactylus of third pair in the ratio 13.9: 34.9: 13.9: 37.2: 11.6, respectively
(Fig. 2E).
Fifth pleura of the abdomen
unilobed at postero-lateral region as in the genus. Pleopods comparatively
shorter than in other species of the genus; second pleopod with basis and rami
almost same sized; appendix masculina long, folded structure with very stiff
setae along its border and extends up to 2/3 distance of endopod. Uropodal exopod bears an accessory spine
almost the length of major one and free borders with long setae (Fig. 3A).
Females: Carapace smooth, about
43 per cent to total length (average) (Fig. 1 B). Second pereopods slender, smooth, equal sized
with ischium, merus, carpus, propodus, palm and dactylus in the average ratio
16.8: 26.0: 21.6: 35.7: 17.9: 18.4, respectively; palm subequal to fingers and
without even traces of denticles on cutting edges (Fig. 2A). The non-chelate legs slender, segments in the
average ratio 13.8: 27.5: 13.8: 28.6: 16.3, respectively. Fecundity 120 eggs (42 mm in total length).
Variation in growth: Young
specimens: rostrum not much elevated as in adult, second chelipeds slender,
without tubercles below the size of total length up to 48mm (Fig. 1 C). Male (big sized 56.0mm sized – recently
collected): second pereopods unequal, major leg 2.4 times longer than minor
leg; ischium, merus, carpus, palm and dactylus in the ratio 9.62: 19.25: 24.07:
23.52: 23.52, respectively; palm broader, fingers subequal and very slender,
movable finger longer and slightly curved and with six small denticles of which
distal one roughly 1/3rd distance from the base; minor leg with
ischium, merus, carpus, palm and fingers in the ratio 14.10: 23.08 ; 21.79:
15.38: 25.64, respectively; palm swollen; fingers slender and curved with a
wide gap when closed; palm and fingers possess stiff long setae (Image 3). Variations in the growth is shown in image 4.
Table 1 provides detailed
morphometric measurements of the specimens.
Colouration: Body generally
bluish coloured with red streak on lateral side of rostrum
Distribution: Ayeyarwady
River at Mandalay, Myanmar.
Remarks
The new species is closely related
to Arachnochium kulsiense (Jayachandran, Lal Mohan & Raji, 2007) and
A. mirabile (Kemp, 1917). M.
myanmarum sp. nov. is characterized by the presence of a medium sized
highly elevated rostrum which extends as far as the distal segment of antennular
peduncle or behind. The dorsal margin is
curved with 11–15 of which 3 (rarely 4) post-orbital in position. Branchiostegal groove extending slightly
behind hepatic spine. The second
pereopods are unequal. The major legs
1.7 times longer than the total length and 2.4 times the total length of minor
leg. The fingers of major leg are
slender and almost equal to palm and bear two to six minute denticles at
proximal cutting edges of which the distal denticles situated at about 1/3rd
distance from base whereas in the minor leg the palm is swollen and subequal to
fingers and carpus. In large males the
fixed finger is a bit smaller than movable finger and movable finger
curved. It possesses large number of
eggs. In A. kulsiense rostrum
is long which extends as far as the tip of antennal scale and the upper margin
highly elevated with 9–12 teeth of which two or three are post-orbital in
position. The second cheliped in which
palm is shorter than fingers and carpus.
It possesses a few large eggs (up to 20). A. mirabile is characterized by
a highly elevated short rostrum with a formula of 13–16 of which 4–6 teeth
post-orbital in position and 1–2 ventral teeth.
Dorsal teeth not uniformly spaced.
Branchiostegal suture not extending behind hepatic spines. Second pereopods subequal in length and
similar in form with palm subcylindrical, fingers slender and much longer than
palm and without denticles on the cutting edges, chela 1 ¾ times as long as
carpus, palm swollen, smooth and less than ¾ as long as carpus. The present new species can at once be
identified on the basis of its highly elevated curved rostrum with specific
rostral formula and also nature, proportion of segments, ratio between carpus,
palm and fingers of major leg and denticles on cutting edges. Fifth pleura of abdomen is unilobed as in the
genus. A comparison of characters of
related species is given in Table 2.
Morphological variations during growth are shown in image 4.
The very slender fingers of the
major second chelate leg of the present species shows some resemblance with
that of M. lar (Fabricius, 1798).
The rostral formula and general shape of the rostrum of the two species
differ considerably. In M. lar
chela is 3.5 times as long as carpus and palm of uniform thickness and
longer than to twice as long as carpus.
Carpus is shorter than merus. In
the present new species chela is about 2.0 times as long as carpus and palm
shorter than carpus and distal region with maximum thickness. Carpus longer than merus (Chace & Bruce
1993).
Wowor & Ng (2010) have
created a new genus, namely, Arachnochium, to accommodate M. mirabile
and M. kulsiense. This
new genus is characterized by the presence of elongated fourth and fifth
pereiopods, large blunt tip triangular median process on T4, without transverse
plate in T5, without wide median process in T8, bilobed nature of
postero-lateral region of fifth abdominal pleura and longer inner spine on
exopod of uropod. The present new
species does not possess any of the above characters and hence it is appropriate
to retain it in the genus Macrobrachium Bate, 1868
Khin et al. (2018) have
reported M. kulsiense Jayachandran, Lal Mohan & Raji (= A.
kulsiense) from Myanmar and is a misidentification.
Table 1. Morphometric
measurements (mm and ratio) of specimens of Macrobrachium myanmarum sp.
nov. from Ayeyarwady (Irrawaddy) River, Myanmar.
Sex |
TL |
CL |
CTL |
LR |
LT |
Major second chelate leg |
Third non-chelate legs |
|||||||||||
I |
M |
C |
P |
Pa |
D |
I |
M |
C |
P |
D |
||||||||
Macrobrachium myanmarum sp. nov. |
||||||||||||||||||
M* |
56.0 |
24.0 |
17.0 |
7.0 |
7.0. |
9.0 |
18.0 |
22.5 |
44.0 |
22.0 |
22.0 |
3.0 |
7.5 |
3.0 |
8.5 |
2.5 |
||
Ratio → |
9.62 |
19.25 |
24.06 |
47.06 |
23.53 |
23.53 |
13.9 |
34.9 |
13.9 |
37.2 |
11.6 |
|||||||
|
|
|
|
|
|
Minor second chelate leg |
|
|
|
|
|
|||||||
|
|
|
|
|
|
5.0 |
9.0 |
8.5 |
15.5 |
6.0 |
9.5 |
|
|
|
|
|
||
Ratio → |
13.1 |
23.68 |
22.37 |
40.80 |
15.8 |
25.0 |
|
|
|
|
|
|||||||
F |
41.0 |
18.0 |
12.0 |
7.0 |
06.5 |
4.0 |
5.5 |
4.25 |
7.0 |
3.5 |
3.5 |
3.0 |
5.5 |
3.0 |
6.0 |
3.0 |
||
F |
39.0 |
16.5 |
12.0 |
6.0 |
07.0 |
3.5 |
5.0 |
4.0 |
7.0 |
3.0 |
3.75 |
2.25 |
5.5 |
2.25 |
5.0 |
3.0 |
||
F |
38.0 |
16.0 |
11.0 |
6.0 |
06.5 |
3.25 |
6.0 |
5.0 |
8.5 |
4.0 |
4.5 |
2.5 |
4.5 |
2.5 |
5.0 |
3.0 |
||
F |
34.0 |
15.0 |
09.0 |
5.0 |
06.0 |
3.0 |
5.0 |
4.5 |
7.0 |
3.5 |
3.5 |
2.0 |
4.0 |
2.0 |
4.25 |
2.5 |
||
Ratio → |
16.8 |
26.0 |
21.6 |
35.7 |
17.9 |
18.4 |
13.8 |
27.5 |
13.8 |
28.6 |
16.3 |
|||||||
(M*—male (Holotype) | F—female | TL—total
length | CL—carapace length | CTL—post-orbital carapace length | LR—length of
rostrum | LT—length of telson | I—ischium | M—merus | C—carpus | P—propodus |
Pa—palm | D—dactylus)
Table 2. A comparison of
characters of Macrobrachium myanmarum sp. nov. with related species.
Characters |
A. kulsiense |
A. mirabile |
M. myanmarum |
Nature of rostrum |
Long, reaches as far as the tip
of antennal scale |
Short, not reaching the tip of
antennular peduncle |
Medium sized reaching as far as
distal segment of antennular peduncle or behind |
Elevation of the upper margin
of rostrum |
Upper margin elevated, tip
directed forwards |
Upper margin highly elevated,
tip directed forwards, |
Upper margin highly elevated,
tip directed forwards (small specimens not much elevated) |
Nature of carapace |
Smooth |
Smooth |
Generally smooth,
antero-ventral region with tubercles |
Rostral formula |
9–12 / 1 (2–3 post-orbital
teeth) |
13–16/1 (3–5 post-orbital) |
11–15 / 0–1 (3–4 post-orbital) |
Dorsal spines of telson |
Placed at about 60 and 70 per
cent, respectively |
Placed at about 60 and 80 per
cent, respectively |
Placed at about 53 and 76 per
cent, respectively |
Ratio of segments of antennular
peduncle |
3.0: 0.9: 1.75 |
3.3: 1.3: 2.3 |
3.3: 1: 1.4 |
Nature of palm and fingers of
first chelate legs |
Palm and fingers equal sized |
Palm shorter than fingers |
Palm slightly longer than
fingers |
Nature and ratio of second
chelate legs - ischium, merus, carpus, propodus, palm and fingers |
Equal sized 21.43: 25.00: 21.43: 32.14:
14.28: 17.86 Fingers slender and equal sized |
Equal sized and slender 21.15: 24.62: 20.38: 33.85:
14.62: 19.23 Fingers slender, equal in
length |
unequal in length (with
spinules adult male). Large male in which major leg 2.4 times that of minor
leg Major leg – 9.62: 19.25: 24.06: 47.06:
23.53: 23.53 Fingers slender, fixed finger a
bit shorter than movable finger Minor leg – 13.1: 23.68: 22.37: 40.8: 15.8:
25.0 Fingers slender, curved with a wide gap when closed |
Denticles on second chelate
legs |
Without denticles |
Without denticles |
2 to 6 small denticles on the
proximal part of fingers of major leg; distal one at 1/3rd
distance from base |
Details on appendix masculina |
Normal sized and with 6 lateral
and 2 distal stiff setae |
Normal sized |
Long, extends up to 2/3 length
of endopod and with numerous stiff setae |
Eggs |
Very few large 15-20 eggs |
small sized over 1000 eggs |
Over 120 eggs |
Colouration |
Whole body with spots |
Creamy white |
Whole body is Dark-bluish in
colour, a dark band on the lateral side of the body |
For figures & images - - click here
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