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Morphometry of Indian Roofed Turtle, Pangshura Tecta (gray 1831) in Bangladesh

Md. Lokman Hossain
Department of Zoology, Dhaka College, Dhaka, Dhanmondi, Dhaka-1205, Bangladesh.

Shorab Uddin Sarker
Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka-1000, Bangladesh

Noor Jahan Sarker
Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Morphometric study was conducted on Indian roofed turtle, Pangshura tecta, between January 1997 and December 2000 in several district of Bangladesh. The mean weight of adult male was 92.6 ± 13.3 g and of female 441.1 ± 185.4 g. The length and width of carapace as well as those of the plastron and the height of the shell varied with the body weight of the turtle. The percentage of hard parts of the body weight of P. tecta was 35.8 ± 2.5 %, whereas percentage of soft parts of the body weight was 64.2 ± 2.5 %. The average weight of the female P. tecta was 4.8 times higher than that of the male.

Keywords: Morphometry, Indian roofed turtle, Pangshura tecta

Location: Chandpur; Narayanganj; Dhaka; Madaripur district.

Start Date: 00-01-1997

End Date: 00-12-2000

Program Area: Knowledge Management

Commodity: Turtle

Objectives:

To ascertain the growth ratio per year in relation to body weight.

Methodology:

The study was carried out at Matlab Bazar turtle market, Matlab upazila; Kaliatoli Bazar and Koiar-pool turtle market of Haziganj upazila, Chandpur sadar turtle market under Chandpur district; Baidder Bazar, Sonargoan upazila; Bot-toli, Jamtoli and Ghudara ghat under Narayanganj district; Mirpur section 10 and Ghudaraghat No 1, Tipu sultan Road, Sham Bazar and Kamalapur turtle export centre and Uttara Sector No. 14 turtle export processing centre under Dhaka district; Patkeel Bazar, Kadambari beel of Madaripur district; Zitka, Sebalaya, Gopinathpur of Manikganj district; and Moheshkhali and Kutubdia of Cox’s Bazar district. The study was carried out between January 1997 and December 2000. A total of 125 P. tecta ( ? = 25 and ? = 100) were used for morphometric analysis. Curve carapace was measured from tip of nuchal shield to end of pygal and curve plastron width measured from middle of inframarginal shield left to right side. Straight plastron was measured from the tip of intergular to end of anal shield. The shell height was measured with taxonomic board in perpendicular way. For convenience of statistical analysis, the males and females were separated into weight groups for the study of frequency distribution. The relationship between the body weight and surface area of carapace and plastron was considered. The distribution of number and percentage of males and females were determined. The length-weight relationship of turtle was determined by means of regression analysis using least square methods from the original data at confidence level 95%. The regression co-efficient and correlation co-efficient were applied by means of ‘t’-statistic at 1% to 5% level of probability. The estimated weight was plotted against the corresponding length, width and shell height to obtain a linear curve distribution. Growth rate of various morphometric characters in relation to body weight of turtles was determined using the standard methods. For biometric study turtles were dissected and measured them on the basis of three categories, i.e. hard parts (carapace and plastron), soft parts (forelimbs, hindlimbs, neck, liver, heart and digestive tract) and other soft parts (blood, spleen and residue). Percentage of different organs in relation to body weight was also calculated by means of regression analysis. The turtle is commonly known as 'Kori Kaitta'. The carapace is elevated, oval with a distinct vertebral keel that is spiked, especially on vertebra ‘ lll ’. First vertebral is as long as wide or longer than wide and vertebral ll and lll are variables. Vertebral ‘ lV ’ is longer than wide and ‘ V ’ is wider than long. Plastron is truncated anteriorly, notched posteriorly and snout is pointed. Carapace has brownish, red or orange stripe along the first three vertebral. Plastron is yellow or pink with 2 - 4 black markings on each plastral scute. Head is with reddish crescent shaped post- ocular markings, curving up from below the eyes to meet on the forehead. Neck with 32 longitudinal lines. Behind each eye or supercilium there is a kidney shaped purple color spot. Male P. tecta was smaller in size compared to female, possessed a comparatively longer tail, with thick base. Male also possessed a white band on the top of the tail, while female possessed a yellow band. The data were analyzed by relevant statistical methods. Regression analysis between two sexes was made to find out the relationship and difference in means of different parameters. The difference between sets of data for given parameters were subjected to analysis of variance (ANOVA). Computer package program Excel and SPSS (Version 10.00) were used for all the statistical analysis.

Source of Information: Bangladesh J. Zool. 41(2): 207-215, 2013

Article Link (Online Journal): http://www.banglajol.info/index.php/BJZ/article/view/23323/16026

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study showed that the female attained maturity at the carapace length of 18.2 cm and body weight of 482 g. Shrestha mentioned that the turtle reaches about 230 mm in length. mentioned from Pakistan, CL of female was between 16.4cm and 17.3 cm, CW 14.7 cm and 15.3 cm, PL 11.5 cm and 11.7 cm, SH 7.3 cm and 8.4 cm. when BW was 510 g, and the CL of male 6.6, CW 5.4, PL 6.3 cm, SH 3.7 cm and BW 54 g. These differences might have happened due to different habitat and study period and the abundance in the field. The present study revealed that the females were 4.8 times larger than males. In addition, males differ from females by having a longer and thicker tail that opens beyond the carapace rim as was also reported.

Knowledge Management: Journal