Development of Non-teleost Fishes by Yvette W Kunz, Carl A. Luer, B.G. Kapoor

By Yvette W Kunz, Carl A. Luer, B.G. Kapoor

An updated compilation of the advance of non-teleost fishes has up to now been unavailable. those fishes comprise 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, ultimately, the nearest relatives to the tetrapods: the lungfishes (the coelacanh [�living fossil�], Protopterus of Africa, Lepidosiren of South the USA and Neoceratodus of Australia). as a result, the current quantity has been dedicated to remaining the space through an updated medical evaluation of the early life-history of those non-teleost fishes (agnathi excepted).

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A and B at equal scale; D, F and G at equal scale. Note the expanded pharyngeal region of younger embryos, a characteristic of lamnid embryos. (Photographs Malcolm Francis). 36 stomach from egg consumption. Lamnid embryos have a unique pharyngeal expansion present during pre-pigmentation stages that gradually diminishes to normal proportions prior to parturition (Fig. 14A-D). Embryonic dentition is present in the smallest embryos and teeth are shed between 34-38 cm (Fig. 14C). C. taurus utilizes a strategy termed adelphophagy, a specialized form of oophagy where ova and developing conspecifics become a source of nutrition.

C) Early embryo of D. laevigata with fusiform body. (D) D. laevigata embryos with expanding pectoral discs. (E) D. akajei embryo with pectoral disc growing laterally and anteriorly to the margin of the pharyngeal region but not yet fusing. (F) D. akajei embryo with fusing pectoral disc and long gill filaments. (G and H) D. laevigata embryo with completely fused disc and yolk within the yolk stalk. (I and J) D. akajei embryos with completely absorbed yolk sac (arrow) and reabsorbed gill filaments.

2007). The umbilicus may be smooth or develop appendiculae which are superficially reminiscent of trophonemata (Alcock, 1890). The appendiculae may be present as a dense carpet of villous branching extensions or only sparse, long, twisting filaments (Fig. 17D-G) (Southwell and Prashad, 1910; Wourms, 1977). , 2005a). Appendicular secretions are completely uncharacterized. In M. canis, pairs of ova are ovulated in succession from the right ovary (Figs. 18-19). Each egg is fertilized and individually enclosed in a pleated egg envelope (Fig.

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