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Table 2 Comparison of the ranges and means (in parentheses) of two morphometric characters and four morphometric ratios among collected specimen (mature ♂) and the four Scylla species provided by Keenan et al. (1998)

From: Non-indigenous giant mud crab, Scylla serrata (Forskål, 1775) (Crustacea: Brachyura: Portunidae) in Malaysian coastal waters: a call for caution

Ratio (mm)

Mature ♂

S. serrata

n

S. tranquebarica

n

S. paramamosain

n

S. olivacea

n

CW

142.72

102.4–204.4 (147.3)

60

102.5–143.8 (120.8)

24

111.1–145.7 (122.5)

9

98.8–138.1 (112.2)

63

ICW

139.81

95.5–191.7 (138.4)

68

97.1–137.8 (113.7)

25

104.8–134.1 (114.7)

9

95.0–133.9 (107.5)

66

ICS/OCS

1.048

0.500–1.583 (0.940)

55

0.467–1.429 (0.980)

24

0.188–0.941 (0.352)

9

0.000–0.250 (0.006)

63

FMSH/FW

0.061

0.041–0.095 (0.061)

67

0.031–0.053 (0.043)

23

0.040–0.081 (0.058)

9

0.018–0.037 (0.029)

64

FW/ICW

0.377

0.335–0.406 (0.371)

68

0.383–0.443 (0.412)

25

0.364–0.386 (0.377)

9

0.371–0.451 (0.415)

66

LSH (CW-ICW)/ICW

0.021

0.018–0.046 (0.031)

60

0.022–0.044 (0.031)

24

0.022–0.049 (0.034)

9

0.015–0.037 (0.022)

63

FMSH/DFMS

0.422

0.224–0.544 (0.418)

63

0.216–0.371 (0.310)

23

0.283–0.483 (0.369)

9

0.143–0.316 (0.221)

64

  1. CW carapace width, ICW internal carapace width, ICS inner carpus spine, OCS outer carpus spine, FMSH frontal median spine height, FW carapace frontal width, DFMS distance between frontal median spines