bulletin 37 - Eprints@CMFRI - Central Marine Fisheries Research ...

More documents

Recommendations

Info

hooks ; finlobes fused {losfefiody. Eyed eith^covered or 6pen and without supfXemetatatyeyelid.3. Order Octopoda Leach, 1818Internal shell vestigeal and cartilaginousexcept in females of Argoiumta which has anexternal, calcified shell. Eight arms, suckerswithout stalls and without chitinop rings;tentacles a]^sent; fins abseiit e;^^pt in a fewdeep watef spepies; light organs abseiU.ORDER SEPIOIDEAThe salient features to be examined for the identificationof genera and species of cuttlefishes are asfollows:1. Cuttlebohe: General shape, nature of thedorsal surface, structure of the inner cone,number and nature of grooves and ridgeson the ventral side, the nature of growthlines fotmd in the striated area and iha vpioB.2. Tentacular clubs : Nwnber of tianaverserowsof club suckers and their relative size (diameter),the nature of protective meinbraneon the sides of the clubs.3. Hectocotylization: Structure of the hectocotylizedarm with regard to the modifiedportion, the number and arrangement of normaland modified suckers and the extent of modificationof the arm.4. Shape and disposition of fins along JJMI mantle.$. In some species the characterisUe externalcolouration and colour pattern of fbe atantle,head and arms noticeable in fresh mafefial.KEY TO THE IDENTIFICATION OF GENERA AND SPECIES OFCOMMERCIALLY EXPLOITED Qvrt\£BlSm& QVT^ llSmmSEAS1. Body either elongate and br
6. Tentacular clubs very long, with iO-14 roWS ofminute subequal suckers. Cuttlebone broad andthick with a median longitudinal ridge with afaint groove running medially on striated area ;inner cone forms a ledge-like callositySepia aculeataTentacular clubs either short or moderately long,with 6-10 rows of small suckers. Cuttlebonethin and elliptical or acuminate in shape with orwithout ridges on striated area, innercone withoutcallosity 77. Tentacular clubs short with 6-8 small subequalsuckers. Cuttlebone flat and distinctly acuminateanteriorly, dorsal surface rugose, a shallow mediangroove in the striated area, the striae ' A ' shapedwith a median shallow groove broadening anteriorly; inner cone and its limbs pinkish in colour;spine small, sharp and slightly curvedSepia brevimanaTentacular clubs moderately long, with 10 rowsof small suckers of uniform size. Cuttlebonethin, elliptical in shape, dorsal surface smooth ;two conspicuous lateral ridges more prominentanteriad resulting in three longitudinal furrowsin striated area ; spine thick, sharp, long and wellcurvedSepia elliptica8. Two prominent ear-shaped fleshy projectionpresent on head below eyes. Fins do not extendupto end of mantle; tentacles with short andcijrved clubs, small subequal suckers in 5 or 6rows. Cuttlebone lanceolate with rounded anteriortip; spine absent and edges of cone notwinged but spatulate posteriorlySepia arabicaNo fleshy projections on head', fins extendupto end of mantle ; tentacles with short clubs,suckers in eight rows, about five in third rowenlarged. Cuttlebone lanceolate with acuminateanterior tip with edges of outer cone wingedgiving an arrow head appearance; spine smallSepia trygoninaApart from the above species of cuttlefishes whichare included in the key, a number of other species viz.Sepia latimanus Quoy and Gaimard, 5" mwrayi Adamand Rees, S, omani Adam and Rees, S. kobiensis Hoyle,•S, recurvirostra Steenstrup, S. savignyi BlainvilleSepiadarium kochii Steenstrup, Euprymna berryi Sasakiand E. morsei (Verrill) have been recorded from theIndian Ocean. Some more sepiids which have tseenreported from the father parts of Indian Ocean viz.Sepia apama Gray, S. australis Quoy and Gaimard, S.braggi Verco and S. escuhnta Hoyle are also likelyto occur in Indian Seas.ORDER TEUTHOIDEAThe various characters used in identifying the differentspecies of neritic and oceanic squids (Order Teuthoidea)are given below. The definitions and details of importantcharacters and terms are given in the glossaryof technical terms.1. General shape of the mantle.2. The shape and proportion of fins, the contourof the anterior and posterior margins of the finlobes ; position of fins on the mantle viz. terminalor marginal; united or separated at the posteriorend.3. The relative size of head and arms ; size, shape,number and arrangement of suckers on the armsand tentacular clubs; the nature and dentitionof the chitinoxis rings of the suckers.4. Presence of hooks and/or suckers on the armsand tentacular clubs.5. Details of hectocotyUzation, the number andarrangement of normal and modified suckersand the extent of other modifications affectingthe arm.6. Presence or absence of light organs (photophores),their shape, number and position.7. Nature of the funnel locking apparatus.8. Presence or absence of accessory nidamentalglands.9. Shape of gladius.10. Shape of eggs and egg clusters.KEY TO THE IDENTIFICATION OF COMMERCIALLY IMPORTANTNERITIC AND OCEANIC sqinos OF THE INDIAN SEAS1. Eyes completely covered with a corneal membrane(MYOPSIDA r Neritic Squids)^ 2Eyes not covered with a corneal membrane and, open to the surrounding medium (OEGOPSIDA :Oceanic squids) 72. Body elongate, cylindrical in outUne ; fins marginal,wide and muscular, very long almost runningalong entire length of mantle j elliptical in shape20CEPHALOPOD RESOURCES OF EE
Page 1 and 2: ulletin 37
Page 3 and 4: EXPLOITED AND POTENTIALLY IMPORTANT
Page 5 and 6: JVlitt II III IVRight Orol armsArm
Page 7: IVIII.ArmlengthFunrMi openingFunnel
Page 11 and 12: omellii (Ferussac) and Nototodarus
Page 13 and 14: facilitate the two clubs to adhere
Page 15 and 16: about 12 rows of normal suckers fol
Page 17 and 18: CMFRI BULLETIN 37 E. G. SILAS ET AL
Page 19 and 20: CMFRl BuLETiN 37E. G. SILAS ET At.P
Page 21 and 22: slightly wider than long. The bucca
Page 23 and 24: stickeifs Crowding td give a ' sWab
Page 25 and 26: CMFRl Bui.TfTiN 37 E. G. SILAS ET A
Page 27 and 28: CMFRI Buu.ETiN 37 E. G. SILAS ET AL
Page 29 and 30: The Vade of the gladius Is broad at
Page 31 and 32: (ieep pit present on the ventral si
Page 33 and 34: CMFRI BULLETIN 37 E. G. SILAS ET AL
Page 35 and 36: CMFRI BULLETIN 37E. G. SILAS ET AL.
Page 37 and 38: There are two distinct tubercles ov
Page 39 and 40: REFERENCESABDUIXA, I. M. AND A. Z.
Page 41 and 42: DEES, LOLA T. 1961. Cephalopods: cu
Page 43 and 44: I8HI, M. 1977. Studies on the growt
Page 45 and 46: NARASIMHAM, K. A., G. SUDHAKARA RAO
Page 47 and 48: ROBSON, G. C. 1932. A monograph of
Page 49 and 50: t)NDP/FAO 1976b. Survey Results 197

bulletin 37 - Eprints@CMFRI - Central Marine Fisheries Research ...

Create successful ePaper yourself

Delete template?

Save as template?