After Wülker et al. (1989):
Pupa: Total length 5.64-6.22 mm (male); 6.44-6.66 (female). Integument infuscate with darker stripe extending to the postero-lateral spur, swim fin dark. Cephalothorax with coarse tubercles along both sides of the median raphe. Tergum II with 62-84 recurved hooks. Terga II-VI with coarse shagreen over most of the surface; tergum VII with finer shagreen in the basal half; tergum VIII with fine shagreen towards the lateral margin.
Caudolateral spur of segment VIII usually with only 1, but occasionally 2 or 3 weaker spines at the end. Swim fin 68-90 flattened marginal setae.
Larva a small plumosus-type; length about 8.0 - 12.0 mm (Bath and Anderson, 1969). Anal tubules 4 - 6 times longer than wide (abt. 520 x 140 micron).
Pale gula and frontoclypeus.
Mentum with pointed teeth; centre (c1) tooth moderately broad with parallel or slightly diverging sides, c2 teeth well developed and sharp pointed (i.e. type IIA). Pecten epipharyngis with about 15 long tapering teeth.
Ratio of antennal segments 25 : 5 : 1 : 2 : 1 (Bath and Anderson, 1969). AR about 2.1; basal segment about 4 times longer than wide; ring organ toward center of the segment.
Mandible with third inner tooth darkened (generally type IIIC).
Cytology: 4 polytene chromosomes with the pseudothummi arm combination AE, BF, CD, G.
Arm G paired with a virtually terminal nucleolus at one end and two Balbiani rings, seperated by dark bands near the other end. The more distal BR is almost terminal in Mississippi populations due to an inversion, apparently as in C. columbiensis. No nucleoli in the long chromosomes.
Inversion polymorphism occurs in arms D, F and G, although no heterozygotes have been found for the inversions in arms F and G. Two inversions occur in arm D, a short proximal one in California populations, and a distal one in Texas and Mississippi.
anyA1: 1a - e, 12 - 10, 4 - 9, 2d - 3b, 2c - 1f, 3c-i, 13 - 19
anyB1: Puff (group 7) about 1/3 from distal end.
anyE1: 1a - 2e, 9a - 10b, 3e-a, 8i - 3f, 10c - 13g
anyF1: 1a-i, 16 - 19d, 6b - 2, 15 - 14, 12 - 13, 6c - 11, 20 - 23 (Texas, Mississippi), as columbiensis
anyF2: 1a-b, 2b - 6b, 19d - 16, 1i-c, 2a, 15 - 14, 12 - 13, 6c - 11, 20 - 23 (California)
Found: California - Stanford, Santa Clara Co.; Near Palo Alto, Riverside (incl. 'Midgeville', UCR Campus), 3.5 mls. Palm Desert, & Corona, Riverside Co.; Arlington.
Mississippi - Jackson, Hinds Co.(30.50°N; 90.33°W)
Texas - Brackenridge Exptl. Stn., Austin, Travis Co.(30.27°N, 97.73°W); Fish hatchery Galveston, Galveston Co. Called C. karensisby Laufer et al. (1982)
Also found in West Indies - St. Vincent Island (Type locality).
Sp. 51 of Frommer. Egg mass described (as C. sp. 1) by Morrow, Bath & Anderson (1968) and larva by Bath and Anderson (1969). Morphology and cytology described by Wülker, Sublette, Morath & Martin (1989b), some details of arms A, E and F given by Wülker & Morath (1989) and a photograph of arm G showing the location of the ssp160 gene (BR4) in Phillips et al. (1999).
Biever (1965, 1971) successfully bred this species in the laboratory (under the name C. sp. 51).
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