cyphonautes


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cyphonautes

[‚sī·fə′nōd·ēz]
(invertebrate zoology)
The free-swimming bivalve larva of certain bryozoans.
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Larvacean abundance and percentage abundance in either season, and the abundance and percentage abundance of cyphonautes in autumn, did not differ between depths.
Competent cyphonautes larvae were collected from the plankton in San Juan Channel near the Friday Harbor Laboratories (San Juan Island, Washington State) by dragging plankton net with a boat during summer 1994 and were stored in the laboratory in seawater at about ambient sea temperature ([approximately equal to] 13 [degrees] C in late summer) until the experiment.
The swimming speeds of cyphonautes larvae are significantly higher than their crawling speeds (Table 1; t test, P [less than] 0.
Distribution of cyphonautes larval behavior after encounter with the substratum in still water and flow conditions.
In the present study, cyphonautes larvae were also found to use mucous threads for the initial encounter and attachment.
Cyphonautes larvae are able to explore substrata under flow velocities that are much higher than their locomotory speeds.
These organisms are important because they are common on the wall and are also interesting because much work has been done with Spirorbis setigers (Knight-Jones 1951), bryozoan cyphonautes larvae (Keough 1984), and crawling Alcyonium planula larvae (Sebens 1983).
Late-stage larvae of Membranipora membranacea are similar in shape to a blunt-ended triangle covered in a bivalved shell and are commonly referred to as a cyphonautes larva (Fig.
Particular to the cyphonautes form are nerves that underlie feeding-related structures such as the ciliated ridges and gut.
Table 2 Structural diversity of ciliated sensory neurons among cheilostome bryzoan larvae Larval type Region of larval body Cyphonautes (1) Buguliform (2), (3) Apical disc CR and NP CR and NP Bordering the oral groove BC BC Adjacent to Ciliated tufts (IC) Ciliary whorls (IC) propulsive ciliary fields Ciliated tufts (SC) Potential IC?
Even though the intercoronal cells of cyphonautes larvae are inconspicuous, the position of the median nerve of the pyriform complex is likely homologous to the intercoronal cell at position 111 in coronate larvae.
Cyphonautes ciliary sieve breaks a biological rule of inference.