General morphological characteristics of the Sepia Pharaonis (cephalopoda) from Persian gulf, Bushehr region
【摘要】：The common cuttlefish( Sepia pharaonis Ehenberg,1831) is known as one of the economicallyimportant species in the classes Cephalopoda.Due to the high commercial values in this study, from October 2009 to July 2010, 50 cuttlefish were collected monthly from the Persian gulf ,Bushehr region,(52°56 E, 27°16 N) . Discrimination between species based on morphological characters.These characters are useful for species differentiation. In the present study,22 morphometric characters was measured carefully. length - weight regression were drived for male and females. The results obtained show that sexual dimorphism is not distinct. Sepia pharaonis have distinct tiger-stripe pattern on the dorsal side of the mantle.The tentacular club has big suckers, of which about 6 sukers in medial rows are much enlarged.The leftventral arm of male has 10-12 basal transverse series of normal suckers followed by7 series of modified suckers.The cuttlebone is plate like callosity.A discriminant function that allows an easy separation of two species. The function,composed of these indices: head length/mantle length(HL/ML) and mantle width /mantle length( Mw/ML) and arms I length/ mantle length ( A I L/ML), arms II length/ mantle length( A II L/ML), arms III length/ mantle length (A III L/ML) arms IV length/ mantlelength( AIVL/ML).