By Yvette W Kunz, Carl A. Luer, B.G. Kapoor
An up to date compilation of the advance of non-teleost fishes has to date been unavailable. those fishes contain the jawless fishes (hagfish and lampreys), the cartilaginous fishes (sharks, rays, skates and chimaeras), the forerunners of the teleostei: the cladistia (bichirs and reedfish), the chondrostei (sturgeon and paddlefish, the neopterygii (gar pike and bowfin), and, eventually, the nearest relatives to the tetrapods: the lungfishes (the coelacanh [�living fossil�], Protopterus of Africa, Lepidosiren of South the US and Neoceratodus of Australia). accordingly, the current quantity has been dedicated to remaining the distance via an updated medical evaluation of the early life-history of those non-teleost fishes (agnathi excepted).
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Extra info for Development of Non-teleost Fishes
Several supernumerary sperm nuclei are scattered along the s-m transition zone. (B) Synchronous mitoses, both involving diploid and haploid nuclei, separated by a transient zone of pigmented, dense cytoplasm. (C) Asynchronous, syncytial segmentation. First plasma membranes appearing at the surface of the germinative disc. Small, haploid nuclei at rest remain deep in the s + m zone. (D) Early blastodisc stage. Only one layer of surface blastomeres. Production of deep blastomeres by the syncytial parts of the germinative disc.
This record resulted in categorizing Rhincodon as oviparous until 1995. Reproduced from Baughman (1955) with kind permission of the American Society of Ichthyologists and Herpetologists. (D) R. typus empty egg cases and hatched embryo from Taiwanese female described in Fig. 11A. Egg cases in this photo are dehydrated and partially collapsed compared to (C). (E) Egg case of Ginglymostoma cirratum. (F) Schematic representation of R. typus egg capsule with two respiratory canals (*), hatching terminus, H, and non-hatching terminus, NH.
The distal yolk sac is distended, flaccid, and highly vascularized. (E) 130 mm embryos bear well-developed appendiculae, a, that cover the umbilical cord. The egg envelope, e, is closely associated with the greatly expanded yolk sac, y, and the embryo is firmly attached to the uterine wall forming a placenta (F) 250 mm embryo at midterm. Juvenile pigmentation is visible, the appendiculae have reached their maximum development, and the yolk sac is much reduced. (G) 320 mm embryo at term. The embryo has increased greatly in weight and girth.
Development of Non-teleost Fishes by Yvette W Kunz, Carl A. Luer, B.G. Kapoor