The sides and both hard and soft dorsal
fins can lighten significantly when they become agitated (Fig.
2c); no scales on preopercular flange, its posterior margin weakly serrated; low scaly sheath on soft dorsal
and anal-fin ray bases; dorsal-fin spines strong, fourth and fifth longest; first anal-fin spine visibly shorter than orbit diameter; second anal-fin spine clearly longer than longest (fourth) dorsal-fin spine; third anal-fin spineshorter than second anal-fin spine; pectoral-fin long, its length subequal or slightly greater than head length, tip nearly reaching to anal opening (in some paratypes up to anal-fin spine base); pelvic-fin spine longer than snout length; first ray of pelvic-fin intruded and clearly longer than second anal-fin spine; caudal-fin forked, the upper lobe is slightly longer and relatively more pointed.
(2010) who concluded that length of dorsal fin base, depth of caudal peduncle and head length and the first anal spine length and length of soft dorsal
ray for T.
We've had equal success with bluegills hooked through the bottom lip and out a nostril and baits hooked just behind the soft dorsal
We identified juvenile and adult Iowa darters using presence of a frenum, two anal-fin spines, an incomplete lateral line (usually extending posterior to between the origin of the soft dorsal
and the midpoint of soft-dorsal base), dark saddles or other pigment on the lateral surface, and a terminal mouth and snout.
and anal rays of species of Tryssogobius.
3a Body orange; [greater than or equal to] 15 soft dorsal
rays; juveniles with blue spots on body: Hypsypops rubicundus
However, photographs of captive adults (Figs 2 & 4-upper) indicate typical Melanotaenia sexual differences consisting of a deeper body (32.4-37.6 % of SL, calculated from photographs), taller first dorsal fin, and longer soft dorsal
and anal rays.
5B; tips of dorsal-fin spines broken in lectotype) and decreasing in height to spine XII; spine XIII much longer, forming anterior support of dorsal-fin rays; membranes of spinous dorsal fin moderately incised, less so posteriorly; soft dorsal
fin with anterior rays longest, posterior rays gradually shortening.
Caudal-peduncle grooves (or shallow notch) present dorsally and ventrally; base of soft dorsal
and anal fins unequal in length with anal-fin base shorter (only about 45-70%) than dorsal-fin base length 13
Although the last-mentioned four species all possess a dark opercular marking, they differ noticeably from V lepidobucca in lacking scales on the head, and counts of soft dorsal
and anal rays (respective counts of 14 and 15, 12 and 12,11 and 11, and 12 and 11 for V auronotata, V opercularis, V papilio, and V hiramatsui).
Color in preservation: dark brown dorsally, light brown, tan, to cream ventrally, with four dark saddles along dorsal length of body extending ventrally to, and sometimes slightly below, lateral line, anteriormost saddle situated beneath spinous dorsal fin, two beneath soft dorsal
fin, posteriormost saddle on caudal peduncle; most specimens with a small saddle or narrow band of pigment crossing soft-dorsal fin at mid-length (homologous to fifth saddle of many congeners).