African weakly electric fishes of the genus Petrocephalus (Osteoglossomorpha: Mormyridae) of Odzala National Park, Republic of the Congo (Lékoli River, Congo River basin) with description of five new species Author Lavoué, Sébastien Author Sullivan, John P. Author Arnegard, Matthew E. text Zootaxa 2010 2600 1 52 journal article 47628 10.5281/zenodo.197589 53fca97f-1dda-43cc-b95e-2eca97fde26c 1175-5326 197589

TABLE 7. Principal morphometric ratios and meristic counts for five syntypes (MRAC 7145-7151), two specimens from Odzala (CU 88095, CU 88057) and 16 specimens from the Lower Congo and Sangha River (AMNH collection and four uncatalogued specimens, see text) of Petrocephalus christyi Boulenger 1920 (Abbreviations: Std–Dev= standard deviation; Min–Max= minimum–maximum).

	Min–Max Mean	Std–Dev Min–Max	Min–Max	Mean	Std–Dev
Standard length (mm)	65.1– 89.5 100.0	12.7 50.5–84.7	67.0–109.6	82.5	12.7
Head length (mm)	18.7–26.9 24.5	3.0 16.0-24.2	19.7–30.3	23.6	3.5
Ratio of standard length (SL):
SL/body height (H)	3.0–3.2 3.1	0.1 2.7–2.9	2.6–2.8	2.7	0.1
SL/head length (HL)	3.5–3.7 3.6	0.1 3.2–3.5	3.2–3.8	3.5	0.1
SL/pre-dorsal distance (PDD)	1.6–1.7 1.6	0.0 1.6–1.6	1.5–1.6	1.6	0.0
SL/pre-anal distance (PAD)	1.6–1.7 1.6	0.0 1.6–1.6	1.6–1.8	1.7	0.0
SL/dorsal fin length (DFL)	4.1–4.4 4.2	0.1 4.3–4.4	4.1–4.4	4.2	0.1
SL/anal fin length (AFL)	3.6–3.8 3.7	0.1 3.7–4.0	3.2–3.7	3.5	0.1
SL/caudal peduncle length (CPL)	5.5–6.1 5.7	0.3 5.7–5.8	5.3–6.5	5.9	0.3
SL/mouth width (MW)	17.7–20.1 18.8	1.0 13.6–14.3	10.7–15.3	12.9	1.4
Ratio of head length (HL):
HL/snout length (SNL)	5.3–5.7 5.5	0.1 5.3–6.3	4.9–6.7	5.7	0.5
HL/mouth width (MW)	4.7–5.5 5.2	0.4 4.1–4.3	2.9–4.3	3.7	0.5
HL/eye diameter (ED)	3.1–3.8 3.5	0.2 3.2–3.4	3.3–4.2	3.7	0.3
HL/interorbital width (IOW)	2.8–3.6 3.2	0.3 2.9–3.3	2.4–3.1	2.8	0.2
HL/head width (HW)	1.9–2.2 2.1	0.1 1.7–1.9	1.7–2.1	1.8	0.2
HL/mouth position (MP)	3.2–3.5 3.4	0.1 2.9–3.0	2.6–3.4	2.9	0.2
Ratio of caudal peduncle length (CPL):
CPL/caudal peduncle depth (CPD)	2.5–3.0 2.7	0.2 2.5–2.6	2.4–3.0	2.6	0.2