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Title: Population structure and shell morphometrics of the corallivorous gastropod Drupella cornus (Gastropoda: Prosobranchia) in the Gulf of Aqaba,Red Sea
Authors: Ismail, Naim S
Elkarmi, Ali Z
Al-Moghrabi, Salim M
Issue Date: Jun-2000
Publisher: NISCAIR-CSIR, India
Abstract: A total of 1279 of the corallivorous gastropod Drupella cornus (Roding 1798) from the coral reefs in the Gulf of Aqaba, Red Sea, were studied for age, growth and shell morphometric determinations. The results show the life span to be seven years. The mean observed lengths of the seven age cohorts range from 6.4 to 36.3 mm. Theoretically, using Von Bertalanffy's and Richard's growth formula, the maximum length of this snail may reach 48.0 and 49.0 mm respectively. The annual increase in length is more for young snails (20.0 mm) than older ones. Shell and dry body weights averaged 1335 and 33 mg, respectively. The relationships of the shell length to shell and dry body weights are curvilinear. However, the relationships of the shell length to shell width, aperture length , aperture width are linear. The relative coefficient of condition (Kn) was higher for young snails (1.45) than older ones (1.01). The analysis of Drupella cornus population and shell morphometrics presented in this study supports the view that morphological differences among species of Drupella are enough to classify these species.
Page(s): 165-170
ISSN: 0975-1033 (Online); 0379-5136 (Print)
Appears in Collections:IJMS Vol.29(2) [June 2000]

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