This paper with the systematic study of three species of mysids, collected by R/V "Dr. Fridtjof Nansen", which are new to the northern Arabian Sea. The three species described and illustrated are: Siriella affinis Hansen, Afromysis macropsis Tattersal and Acanthomysis quadrispinosa Nouvel

Nayeem, I.

Rafi, S.

Tirmizi, N.M.

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Pakistan Journal of Marine Sciences, Vol.1(2), 111-115, 1992 
THREE NEW RECORDS OF MYSIDS (CRUSTACEA: 
MYSIDACEA) FROM THE NOR1HERN ARABIAN SEA 
Iffat Nayeem, Samina Rafi and Nasima M. Tirmizi 
Centre of Excellence in Marine Biology, University of Karachi (IN,SR); 
Marine Reference Collection Centre, University of Karachi, 
Karachi-75270, Pakistan (NMT). 
ABSTRACI': This paper deals with the systematic study of three species of mysids, collected by R/V '~Dr. 
Fridtjof Nansen", which are new to the northern Arabian Sea. The three species are; Siriella affinis 
Hansen, Afromysis macropsis Tattersall and Acanthomysis quadrispinosa Nouvel. These are described and 
illustrated in this paper. 
KEYWORDS: Mysids - new records -northern Arabian Sea. 
INTRODUCTION 
The present study includes the description of three species of mysids viz. Siriella 
affinis Hansen, Afromysis macropsis Tattersall and Acanthomysis quadrispinosa 
Nouvel, which are new to the northern Arabian Sea. The previous records of S. affi-
nis are by Hansen (1910) from the East Indies and Pillai (1965) from Gulf of Mannar. 
The species A. macropsis was recorded by Tattersall (1922) from Orissa and Waltair 
coast and subsequently Pillai (1957) found it off Travancore. Liu and Shaowu (1956) 
and Nouvel (1%5) recordedA. quadrispinosa from South China Sea and Madagascar. 
MATERIALS AND METHODS 
The present study is based on the samples collected by R/V "Dr. Fridtjof Nansen" 
during 1977, in the northern Arabian Sea (between 22°09'N to 25°21'N and 61°35'E 
to 6~55'E ) as shown in figure 1. A Bongo net of 180 mesh size was used and the 
organisms were preserved in 4% formalin in seawater. Drawings were made with the 
aid of a camera Iucida and specimens were measured using an eyepiece micrometer. 
All the specimens are housed in the Centre of Excellence in Marine Biology, Univer-
sity of Karachi. 
SYSTEMATIC ACCOUNT 
Siriella affinis Hansen, 1910 
(Figs.2A-D) 
Sirie/la affinis Hansen, 1910, p.35; Tattersall, 1922, p.454; 1951, p.64; Li, 1964, p.89; 
Pillai, 1965, p.1692; Shyamasundari, 1973, p.391. 
112 Pakistan Journal of Marine Science~ Vol.1(2), 1992 
63 6!1 Ul 
;u;'N 
-11!11: 
OAOANI :..;~ 
.343 -<lc Ull'fON~ 
.344 .349 
.31 
24 
.102 
.12 
~------------------------------------------------------~n 
Fig.1. Map of the northern Arabian Sea showing the station positions referred to in the 
text. 
MATERIALS AND MEASUREMENTS: 
Sta.12; 23°17'N; 6~05'E, 22.1.77, hoz. haul, OOGMT, 1 female, totallenght (tl.)6.5 
mm, carapace length ( cl.)1.7 mm.; Sta.31; 24°24'N; 66°50'E, 26.1.77, hoz. haul, 
13GMT, 1 female, tl.5.0 mm, cl.1.4 mm; Sta.102; 23°54'N; 66°49'E, 18.2.77, hoz. haul, 
18GMT, 1 female, t1.5.2 mm, cl.1.4 mm. 
DIAGNOSIS: 
Carapace produced anteriorly. Frontal plate triangular with pointed apex, which is 
moderately narrow and slightly longer than broad. Antenna! scale less than three 
times as long as broad. Pleopods rudimentary. Exopods of uropods longer than 
endopods, with 3 to 5 marginal spines, its distal joint more than half as long as proxi-
mal joint. Inner margin of endopod armed with spines of varying sizes. Telson 
reaches beyond articulation of exopods of uropods, is two and a half times as long as 
broad, widened basal part with two pairs of spines, its lateral margin occupied with 
small spines which gradually increases in length distally. The length of the present 
specimens vary from 5.0 to 6.5 mm as compared to 6.0 to 6.5 mm recorded by Hansen 
(1910). 
DISTRffiUTION: 
East Indies, Gulf of Mannar and now from the northern Arabian Sea (Pakistan). 
Afromysis macropsis Tattersall, 1922 
(Figs.3A-D) 
Afromysis macropsis Tattersall, 1922, p.472; Pillai, 1957, p.10; 1965, p.1715; Kurien, 
1954, p.83. 
Nayeem et.al.: New records of mysids 113 
0.5 mm 
A 
Fig.2. Siriella affinis Hansen, 1910, A, carapace; B, antenna; C, uropod; D, telson. 
0.5 mm A 
0 
0·5 mm 
Fig.3. Afromysis macropsis Tattersall, 1922, A, carapace (anterior part); B, antenna; 
C, male uropod; C', female uropod; D, telson. 
114 Pakistan Journal of Marine Sciences, Vol.1(2), 1992. 
MATERIALS AND MEASUREMENTS: 
Sta.343; 25°04'N; 61°35'E, 13.6.77, hoz. haul, 17GMT, 43 males, tl.4.5-5.5 mm, 
cl.1.3-1.5 mm; 16 females, tl.4.2-5.2 mm, cl.1.3 mm; Sta.344; 24°54'N; 61°35'E, 13.6.77, 
hoz. haul, 19GMT, 16 males, tl.4.5-5.0 mm, cl.1.4 mm; 6 females, tl.4.0-4.5 mm, cl.1.4 
mm. 
DIAGNOSIS: 
Carapace produced in short triangular rostral plate with obtusely rounded apex. 
Antenna! scale slightly shorter than antenna! peduncle, narrow, seven times as long as 
broad. Pleopods rudimentary. Endopod longer than telson, with outer margin occu-
pied with long plumose setae and inner margin with 35 to 38 spines in females and 38 
to 40 spines in males. Exopods of uropods longer than endopods. Telson one and a 
half times as long as broad with three pairs of spines on its much broader base and 20 
to 22 distal most spines, cleft wider proximally with two long plumose setae. 
The specimens under study are equipped with 38 to 40 spines in males on the inner 
margin of the endopods of the uropods, while Pillai (1957) mentioned 40 to 41 spines. 
DISTRIBUTION: 
Orissa, Waltair coast, Trivandrum and now from the northern Arabian Sea (Paki-
stan). 
Acanthomysis quadrispinosa Nouve~ 1965 
(Figs.4A-D) 
Acanthomysis quadrispinosa Nouvel, 1965, p.456. 
MATERIALS AND MEASUREMENTS: 
Sta.344; 24°45'N; 61°35'E, 13.6.77, hoz. haul, 20GMT, 1 mutilated specimen; 
Sta.349; 24°58'N; 62°20'E, 14.6.77, hoz. haul, 14GMT, 1 female (mutilated). 
Q.5mm 
A 
BCD 
Q.5 mm 
Fig. 4.Acanthomysis quadrispinosa Nouvel, 1965, A, carapace; B, antenna; C, uropod; 
D, telson. 
Nayeem et.al.: New records of mysids 115 
DIAGNOSIS: 
Carapace produced anteriorly into blunt triangular rostral plate. Posterior emargi-
nation of carapace leaving last two thoracic segments exposed. Antennal scale long, 
narrow, with rounded apex and nearly six times as long as broad. Pleopods in females 
rudimentary. Endopods of uropods shorter than exopods. Telson two and a half 
times as long as its maximum width, with four strong and two small spines at the apex. 
DISTRIBUTION: 
Madagascar, South China Sea and now from the northern Arabian Sea (Pakistan). 
ACKNOWLEDGEMENTS 
Our deep indebtedness to Dr. M. Murano, Tokyo University of Fisheries, Japan, for 
confirming the identifications of mysids. 
REFERENCES 
Hansen, H.J. 1910. Schizopods of the Siboga Expedition. Siboga Expedition Monograph, No.37. Pp.1-123. 
Kurien, C.V. 1954. Contribution to the study of the Crustacean fauna of Travancore. Bulletin of the Cen-
tral Research Institute of Trivandrum 3: 80-85. 
Li, N. 1964. Fauna japonica Mysidae. Biogeographical Society of Japan. Pp.1-610. 
Liu, R and W. Shaowu. 1956. Studies on Mysinae (Crustacea: Mysidacea) of the northern South China 
Sea. Studia Marina Sinica 26: 159-202. 
Nakken, 0. 1977. Preliminary Cruise Report on Cruises of Dr. Fridtjof Nansen under the joint PAK/ 
NORAD/FAO Fisheries Research Project. Institute Marine Research Bergen. 
Nouvel, H. 1965. Mysedaces recoltes par S. Frontier a Nosy-Be. II. Description de deux Mysini apparte-
nent aux genres Diamysis etAcanthomysis. Bulletin de La Societe d'Histoire Naturelle de Toulouse, 
100: 451-464. 
Pillai, N.K 1957. Schizopoda. Bulletin of the Central Research Institute, University of Trivandrum, Series C, 
5:1-28. 
Pillai, N.K 1965. A review of the work on the shallow water Mysidacea of the Indian waters. In Symposi-
um on Crustacea. Marine Biological Association of India, 5: 1681-1728. 
Shyamasundari, K 1973. Mysidacea of Waltair Coast. Rivista di Biologia dell' Universita de Perugia 66: 
389-406. 
Tattersall, W.M. 1922. Indian Mysidacea. Record Indian Museum 24: 445-504. 
Tattersall, W.M. 1951. A review of the Mysidacea of the U.S. National Museum. U.S. National Museum 
Bulletin No.201: 1-292. 


Three new records of mysids (Crustacea: Mysidacea) from the northern Arabian Sea

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Three new records of mysids (Crustacea: Mysidacea) from the northern Arabian Sea

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