. Bulletin. Science; Natural history; Natural history. 1976 NEW LAMPREY FROM CALIFORNIA 61 1972; collected by D. P. Christenson; deposited in California Academy of Sciences CAS 35987. Paratypes.—W3,33-33,5, 337-343 (7 S, 117-142 mm; 3 9, 140-141 mm), W344 (ammocoete, 160 mm): collected with the holotype: CAS 35988. Diagnosis.—Low number of trunk myomeres, 53 in the ammocoete and between 54 and 57 in transformed specimens (average ); reduced dentition; only three velar tentacles; and reduced pigmentation on its caudal fin. Other diagnostic features are summarized in tables 3-5. Description
. Bulletin. Science; Natural history; Natural history. 1976 NEW LAMPREY FROM CALIFORNIA 61 1972; collected by D. P. Christenson; deposited in California Academy of Sciences CAS 35987. Paratypes.—W3,33-33,5, 337-343 (7 S, 117-142 mm; 3 9, 140-141 mm), W344 (ammocoete, 160 mm): collected with the holotype: CAS 35988. Diagnosis.—Low number of trunk myomeres, 53 in the ammocoete and between 54 and 57 in transformed specimens (average ); reduced dentition; only three velar tentacles; and reduced pigmentation on its caudal fin. Other diagnostic features are summarized in tables 3-5. Description of the liololype.—The holotype, a male 131 mm in total length, is referable to maturity stage three (early maturity: sexual products rather small; dorsal fins separated). Intestine is reduced to a threadlike thickness (). Measurements (in per- cent of total length) are: disc length, ; pre- branchial length ; eye length, ; branchial length, ; trunk length, ; tail length, Disc length, as a percentage of branchial length, is There are 55 trunk myomeres (Fig. 2). Since the holotype is a recently transformed indi- vidual, its disc is not fully developed and the teeth are not well-cornified. There are four inner lateral teeth on each side of the disc; the second tooth, on both sides, is bicuspid, the rest are unicuspid. There is a single row of nine unicuspid posterials. The supraoral lamina is provided with a cusp at each end, but the median cusp, as is typical for parasitic species of Entosplienus, is absent. The infraoral lamina has five cusps. The three lingual laminae were so poorly developed that the cusps could not be counted (Fig. 1); no enlarged median cusp was observed on the transverse lingual lamina. The holotype is a newly transformed individual and its two dorsal fins are far apart (8) and the genital papilla is not visible. The color of the specimen, preserved in 4-5 percent formalin, is brown on the sides and back and whitish on t
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