Revision of the species of the genus Cathorops (Siluriformes: Ariidae) from Mesoamerica and the Central American Caribbean, with description of three new species Author Marceniuk, Alexandre P. Museu de Zoologia da Universidade de São Paulo, Caixa Postal 42494, 04218 - 970 São Paulo, SP, Brazil a_marceniuk@hotmail.com Author Betancur-R, Ricardo Department of Biological Sciences, Auburn University, 331 Funchess Hall, Auburn, AL 36849, USA betanri@auburn.edu text Neotropical Ichthyology 2008 2008-03-31 6 1 25 25 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252008000100004&lng=en&tlng=en journal article 312306 10.1590/S1679-62252008000100004 20063e32-2edc-4e82-9daa-ca17286cea93 1982-0224 5419649

Table6. Morphometrics for Cathorops melanopus. Standard length is expressed in millimeters, other measurements are percents of standard length.

	n	Mean	Range
Standard length (mm)	7	-	113.0-188.0
Head length	2	22.7	22.3-23.0
Snout length	2	5.4	5.3-5.5
Distance between anterior nostrils	2	4.1	3.6-4.4
Distance between posterior nostrils	2	4.8	4.4-5.1
Distance between anterior nostril to orbit	2	6.2	6.2-6.2
Distance between posterior nostril to orbit	2	4.5	4.5-4.5
Orbital diameter	7	4.8	4.5-5.0
Interorbital distance	7	11.7	11.1-12.1
Maxillary barbel length	7	30.5	27.8-32.8
External mental barbel length	7	20.4	19.2-23.4
Internal mental barbel length	7	12.9	11.8-13.7
Distance from snout to maxillary barbel	2	1.2	1.1-1.3
Distance from snout to external mental barbel	2	4.2	4.2-4.3
Distance from snout to internal mental barbel	2	3.6	3.6-3.6
Mouth width	7	9.1	8.9-9.7
Lower-jaw length	2	1.5	1.1-1.8
Premaxilla length	2	1.5	1.3-1.7
Premaxilla width	2	5.5	5.1-5.8
Distance between accessory tooth plates	2	4.4	4.3-4.4
Length of accessory tooth plates	2	2.5	2.3-2.9
Width of accessory tooth plates	2	0.8	0.7-0.9
Width of cephalic shield at lateral ethmoid area	2	11.4	11.4-11.4
Width of cephalic shield at frontals area	2	6.4	6.4-6.5
Width of cephalic shield at epioccipital area	2	11.2	11.2-11.2
Width of cephalic shield at supracleithrum area	2	16.8	16.7-16.9
Distance between lateral ethmoid and supracleithrum	2	19.5	19.3-19.6
Distance between snout and post. margin of dorsomedian groove of neurocranium	2	18.5	17.9-19.1
Supraoccipital process length	2	10.3	10.3-10.4
Supraoccipital process width	6	2.9	2.6-3.4
Nuchal-plate length	2	6.6	6.6-6.6
Nuchal-plate width	2	7.0	7.0-7.1
Body depth	2	17.1	16.7-17.5
Body width	2	19.8	19.6-20.1
Distance from snout to pectoral fin	2	19.7	19.1-20.4
Distance from snout to dorsal fin	2	31.3	30.0-32.6
Distance from snout to pelvic fin	2	47.6	46.2-49.1
Distance from snout to adipose fin	2	72.0	71.9-72.1
Distance from snout to anal fin	2	62.9	61.6-64.3
Caudal-peduncle height	2	8.8	8.7-9.0
Pectoral-fin spine length	2	17.2	16.7-17.6
Dorsal-fin spine length	2	17.6	17.2-18.1
Pelvic-fin base length	2	4.3	4.3-4.4
Pelvic-fin height	6	15.3	13.7-17.8
Adipose-fin base length	2	9.7	9.2-10.1
Adipose-fin height	2	3.2	3.0-3.5
Anal-fin base length	2	20.5	19.9-21.1
Anal-fin height	2	14.0	13.6-14.3
Caudal-fin upper lobe length	2	31.5	31.1-32.0
Caudal-fin lower lobe length	2	29.8	29.7-29.9