Pallid Chub

description

Alabama: Escambia River: (Escambia Co.) UF 44666 (68), UF 73320 (10); TU 15948 (6), TU 81354 (9); UAIC 1823.03 (2), UAIC 10855.04 (1 [illustrated female from presumably larger series, ex Boschung & Mayden 2004: pl. 21 C]). Blackwater Bay [Yellow River system]: (Covington Co.) TU 73150 (1), TU 72958 (1); UAIC 4188.03 (1). Choctawhatchee River: (Dale Co.) UF 73336 (29), UF 73488 (2); (Dale / Houston cos.) UF 73468 (1); (Houston Co.) UAIC 3508.11 (14). Florida: Escambia River: (Escambia Co.) UF 9333 (11), UF 53534 (2), UF 54366 (4), UF 130433 (8), UF 130470 (1), UF 138618 (2), UF 143879 (4), UF 150156 (1), UF 171841 (3), UF 171848 (9); (Escambia / Santa Rosa cos.) UF 75361 (2), UF 75441 (2), UF 172372 (8); (Santa Rosa Co.) UF 73352 (1), UF 73438 (15), UF 145534 (6), UF 145898 (36). Blackwater Bay [Yellow River system]: (Okaloosa Co.) UF 57640 (5), TU 79682 (2), TU 82620 (5), TU 83078 (11), TU 101906 (4), TU 102299 (1). Choctawhatchee River: (Holmes Co.) UF 55457 (21), UF 75477 (1), TU 20811 (28), UAIC 3126.13 (196 originally, now 166), USNM 437191 (5), UMMZ 250265 (5), ANSP 200787 (5), MCZ 171824 (5), KU 41376 (5), UT 44.13095 (5) (six series immediately preceding all ex UAIC 3126.13)

Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species

description

Conservation status. Macrhybopsis pallida is an uncommon species, apparently the rarest of the five eastern members of the M. aestivalis complex. Although the total number of museum specimens examined (667) is substantial, this figure is misleading in many respects. Bailey et al. (1954) did not include the species in their analysis of Escambia River fishes in Alabama and Florida, which, combined with a small number of earlier samples, totaled approximately 30 fish collections available at that time. The first collection to include M. pallida appears to have been a series of 11 specimens (UF 9333), collected by William McLane in October, 1954, from the Escambia River near Pine Barren, Florida. Suttkus (1961) was the first to document the existence of the species, and Yerger & Suttkus (1962: 327) were first to record the species from Florida, although the McLane collection was not cited in either of those publications. Beginning in the 1950 ’ s, fish collecting in eastern Gulf slope drainages of Alabama and Florida increased exponentially, and although the number of collections made from this region has not been precisely tabulated, this surely is now well into the hundreds. Consider

Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species

description

Description. Characters listed in the Diagnosis are not repeated here, unless additional clarification is required. Variation in meristic characters is presented in Table 1. Dorsal-fin rays 8; anal-fin rays usually 7 (rarely 6 or 8); pectoral-fin rays usually 14 and often 15 (range 13 – 16); pelvic-fin rays usually 8 (rarely 7); lateral-line scales usually 36 – 38 (range 35 – 39); predorsal scales usually 16 – 17, often 15 – 18 (range 14 – 19); body-circumferential scale rows above and between lateral lines usually 11, occasionally 10 or 12 (range 9 – 13); body-circumferential scale rows below and between lateral lines incomplete, the scales always missing from mid-belly area anterior to pelvic fins; total caudal-peduncle scale rows uniformly 12 (five scale rows above and below lateral lines on each side of caudal peduncle); total vertebrae usually 37, often 36 or 38; more posterior maxillary barbel longer and more prominent; dorsal fin bluntly pointed at tip; anal fin broadly rounded and never pointed at tip; pectoral fins pointed, sometimes extremely so, often extending posteriorly to or past pelvic-fin origins; head moderately rounded and moderately flattened ventrally; mouth in

Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species

description

Extrarius aestivalis. — Boschung 1992: 52 (in part; brief discussion of systematics; in list of Alabama fishes). Macrhybopsis aestivalis. — Mettee et al. 1996: 218 – 219, lower fig. (in part; general account; localities mapped for all species of M. aestivalis complex in Alabama). Macrhybopsis sp. cf. M. aestivalis “ C ”. — Boschung & Mayden 2004: 209 – 210, pl. 21 C (diagnosis; distribution; systematics; distribution map in part, Alabama).

Morphological and genetic evolution in eastern populations of the Macrhybopsis aestivalis complex (Cypriniformes: Cyprinidae), with the descriptions of four new species