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Table 2 Morphometric data for adult specimens of two distinct karyotypic forms belonging to the Gymnotus carapo species complex from the Eastern Amazon (EA) (G. carapo 2n = 42 and G. carapo 2n = 40).

From: Chromosomal evidence for a putative cryptic species in the Gymnotus carapo species-complex (Gymnotiformes, Gymnotidae)

  G. carapo 2n = 42 G. carapo 2n = 40 G. carapo EA
  Range Mean Range Mean Range Mean
TL 160–365
(9)
- 240–300
(7)
- 165–253
(16)
-
HL 29.0–42.8
(9)
- 29.56–38.7 (7) - 21.0–34.5
(16)
-
HL %* 11.7–12.7 (4) 12.3 12.1–12.8 (3) 12.4 11.7–13.6
(15)
12.7
PR % 34.0–38.5
(9)
35.6 32.6–38.5 (7) 35.6 32.9–35.7
(16)
34.2
MW % 39.7–47.5
(9)
43.8 40.6–46.5
(7)
42.9 41.0–46.1
(16)
43.7
PO % 58.7–63.4 (9) 61.2 60.3–62.5
(7)
61.5 60.0–65.5
(16)
62.3
IO % 33.7–40.2 (9) 37.4 34.5–38.9
(7)
36.8 34.4–40.6
(16)
37.1
BD %* 11.0–14.3
(4)
12.4 13.5–14.3
(3)
13.8 8.7–12.4
(16)
10.1
BW %* 52.3–77.1 (4) 65.2 56.5–67.9
(3)
63.0 6.2–8.6
(16)
7.2
BW/BD 0.59–0.73
(9)
0.65 0.55–0.61
(7)
0.58 0.67–0.76
(16)
0.72
HD % 55.3–64.8
(9)
60.0 58.6–63.2 (7) 60.5 50.8–60.9
(16)
55.2
HD2 % 36.0–40.6
(9)
38.4 37.4–42.3
(7)
40.7 NA NA
HW % 56.2–66.8
(9)
60.7 54.2–59.7
(7)
58.0 53.3–64.4
(16)
56.3
PA % 63.0–88.2
(9)
78.8 64.2–89.5
(7)
75.6 76.5–99.2
(16)
89.0
BO% 31.8–47.3 (9) 39.3 34.2–46.4
(7)
41.2 34.7–38.1
(16)
36.5
P1 % 44.4–50.1
(9)
47.8 46.0–58.6 (7) 51.8 42.7–49.1
(16)
45.7
AF %* 81.1–81.9 (4) 81.4 80.0–80.7 (3) 80.5 69.4–86.6
(16)
75.9
ED % 7.0–10.2
(9)
8.4 8.0–9.1
(7)
8.5 NA NA
  1. For reference we include data for EA populations of G. carapo taken from [10].
  2. Abbreviations: TL: total length; HL: head length; PR: preorbital length; MW: mouth width; PO: postorbital length; IO: interorbital distance; BD: body depth; BW: body width; HD: head depth at nape; HD2: head depth at middle of eye; HW: head width; PA: preanal distance; BO: branchial opening; P1: pectoral-fin length; AF: anal fin base length; ED: eye diameter. TL and HL expressed in mm. Percentage measurements in HL or: if marked with an asterisk: in TL. BW/BD expressed as a ratio. N values (in parentheses) vary because measurements were excluded from specimens with damage or unusual preservation artifacts. NA = not available.