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<br />Table 3. Comparison of the more diagnostic differences in morphometries for larvae and juveniles (9<<>
<br />mm SL) of Upper Colorado River Basin catostomids. Except as otherwise noted for most eye diameters,
<br />all data is given as a percentage of standard length. The full range for each character is followed by the
<br />mean or more typical range. See Fig. 4 for abbreviations and methods of measurement. HL = head
<br />length measured to origin of the pectoral rm (AS to OPl).
<br />
<br /> Calostomus CalOSlOInUS Catoslomus Catostomus Calostomus Xyrcmchen
<br />Character ardens commersoni discobolus latipinnis platyrhynchus lexanus
<br />Protolarvae
<br /> Eye diameter:& 5-7,6 5-7,6 5-6,5 5-6,5 6-8,7 5-6,6
<br /> AS to PE length: 7-9,8 8-9,8 6-7,7 6-9,7 8-10, 9 7-8,8
<br /> AS to OP1 length: 12-17, 15 13-19, 16 13-15, 14 12-16, 14 16-18, 17 14-17, 16
<br /> Yolk length:b 49-64, 57 26-63, 51 61-67, 63 54-67, 61 0-67, 47 0-68, 44
<br /> Pectoral fin lenrh:c 1-8,5 2-12, 7 3-6,5 3-9,6 2-11, 9 3-11, 7
<br /> Depth at OD:b, 10-12, 11 8-13, 10 12-17, 14 13-15, 14 10-14, 12 7-13, 10
<br /> Width at OD:b,d 5-9,7 5-9,6 8-12, 10 7-11, 10 6-11, 8 4-9,6
<br /> Max. yolk depth:b 3-11, 7 1-11, 6 7-12, 10 9-16, 12 0-13, 5 0-9,5
<br /> Max. yolk width:b 5-14, 8 1-10, 6 10-15, 12 9-18, 13 0-14, 6 0-9,5
<br />Flexion mesolarvae
<br /> Eye diameter, % HL:& 34-38, 36 28-38, 34 32-38, 35 32-37, 34 31-38, 35 28-39, 34
<br /> AS to PV length: 75-77, 76 76-81, 79 74-79, 77 75-78, 77 75-78, 77 78-81, 79
<br /> Yolk length: 0-43, 16 0-50, 18 0-53, 26 23-54, 46 0-14, 3 0-50, 4
<br /> Depth at OD:d 8-9,9 8-10, 9 9-12, 10 9-13, 11 10-12, 11 6-11, 9
<br /> Max. yolk depth: 0-2,0 0-3,1 0-7,3 2-8,5 0-1,1 0-2,0
<br /> Max. yolk width: 0-2, 1 0-4, 1 0-8,4 1-9,6 0-2,0 0-5,0
<br />Postflexion mesolarvae
<br /> Eye diameter, % HL:a 31-38, 34 24-34, 31 24-34, 28 24-35, 27 26-35, 30 27-33, 30
<br /> AS to OP2 length: 50-53, 52 52-54, 53 53-57, 55 50-54, 53 52-56, 54 50-54, 52
<br /> AS to ID length:"! 60-63, 62 61-64, 63 61-64, 62 62-67, 64 61-64, 62 65-67, 66
<br /> AS to PV length: 76-80, 79 78-81, 80 76-81, 79 76-80, 78 77-80, 79 78-84,81
<br /> Dorsal fin (D) length:!,g 14-16, 15 16-17, 17 11-17, 15 15-21, 18 11-15, 13 18-21, 19
<br /> Dorsal fin base length:.,!,h 12-15, 13 12-14, 13 11-14, 12 12-17, 15 11-13, 12 16-18, 17
<br /> Yolk length: 0 0 0 0-7,0 0 0
<br />Metalarvae
<br /> Eye diameter, % HL:& 28-33, 30 25-34, 30 22-27, 25 22-25, 24 25-28, 26 24-32, 27
<br /> AS to OP2 length: 53-57, 56 54-59, 56 55-61, 58 52-57, 55 53-58, 56 51-58, 56
<br /> AS to OD length: 49-52, 50 48-53, 51 49-54, 52 47-51, 49 50-53, 51 47-51, 49
<br /> AS to ID length:!. 64-67,65 61-67, 65 63-66, 64 62-67,65 62-65, 63 65-69, 67
<br /> Caudal fin length:' 18-22, 20 16-26, 21 16-24, 21 17-25, 22 15-20, 18 20-28, 23
<br /> Dorsal fin (D) length:! 18-20, 19 15-22, 19 17-21, 19 20-24, 22 15-19, 17 21-29, 24
<br /> Dorsal fin base length:!,h 14-16, 15 12-15, 14 11-15, 13 14-17, 16 11-14, 12 16-21, 18
<br />Juveniles < 40 mm SL
<br /> Eye diameter, % HL:& 27-32, 30 22-28, 25 21-28, 24 19-26, 23 22-25, 24 21-30, 25
<br /> AS to OP1 length: 25-28, 26 24-29, 28 23-27, 25 24-28, 25 24-26, 25 25-31, 28
<br /> AS to OP2 length: 55-58, 56 52-59, 57 56-60,58 52-57, 55 55-60, 57 54-60,57
<br /> AS to OD length: 48-51,49 48-53, 51 47-54, 51 46-49,48 48-52, 50 46-52, 49
<br /> AS to ID length:! 64-66, 65 61-68,65 62-66, 64 61-66,65 60-64, 63 65-70, 67
<br /> AS to PV length: . 73-76, 75 72-78, 76 72-76, 75 72-76, 74 74-78, 75 75-80, 77
<br /> Caudal fin length:' 23-28, 25 19-24, 22 20-24, 23 21-25, 23 19-23, 21 23-28, 25
<br /> Dorsal fin (D) length:! 21-26, 24 18-24, 20 19-23, 21 23-26, 24 18-21, 20 23-29, 27
<br /> Dorsal fin base length:!,h 14-17, 16 13-16, 14 11-16, 13 14-18, 16 12-14, 13 16-20, 18
<br /> Depth at OD: 16-22, 20 17-22, 19 16-21, 19 17-22, 19 18-21, 20 18-27, 23
<br />& Eye diameter = (AS to PE)-(AS to AE).
<br />b Ignore differences in maximum values since they may be affected by developmental state at hatching.
<br />C Ignore differences in minimum values since they may be affected by developmental state at hatching.
<br />d OD for protolarvae and early flexion mesolarvae is approximated at one-half of standard length (AS to PHP).
<br />· Applicable only to specimens with a full complement of dorsal fin pterygiophores or principal rays.
<br /> For Xyrcmchen texanus with a rare count of only 12 or 13 principal dorsal fin rays, lengths for this character may
<br /> be less than the range reported herein (all specimens analyzed for these measures had ~14 principal dorsal fin rays
<br /> or pterygiophores).
<br />g Applicable only to specimens with most principal dorsal fin rays formed; ignore differences in minimum values
<br />h since some data represent specimens with a few fin rays less than the adult count.
<br />Dorsal fin base = (AS to ID)-(AS to OD).
<br />i Caudal fin length = (AS to PC)-(AS to PHP), total length minus standard length.
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