But it is conceivable that the now utterly lost branchiae might have been gradually worked in by natural selection for some quite distinct purpose: in the same manner as, on the view entertained by some naturalists that the branchiae and dorsal scales of Annelids
are homologous with the wings and wing-covers of insects, it is probable that organs which at a very ancient period served for respiration have been actually converted into organs of flight.
The nematodes belonged to the species Nygolaimus and the annelids
to a morphospecies of the family Lumbriculidae.
2009) includes molluscs, annelids
, nemertines, the lophophorates, platyhelminths, and other smaller phyla).
New polychaetous annelids
from New England, Texas and Puerto Rico.
In an apparently similar kind of ciliary feeding by sessile animals (sabellid and serpulid annelids
, entroprocts), the opposed bands are composed of cilia of equal length (Henderson and Strathmann, 2000; Riisgard et al.
Onychophoran worms are rare and most biologists have never seen them alive, but they are important because they have been considered "missing links" between annelids
and arthropods as well as "living fossils" because their shape has not changed for 500 million years (Monge-Najera 1995, Hou and Bergstrom 1997).
Similar egg-surface phenomena occur in zygotes of some other invertebrates, such as nematodes (8) and annelids
Key words: Sand with rock fragments beach, intertidal zone, annelids
, polychaetes, Sao Sebastiao Channel, Brazil.
Direct and indirect development, feeding and nonfeeding larvae, and gradual and catastrophic metamorphoses are all manifest among annelids
2] zinc finger family that has been characterized in three protostome phyla: annelids
, arthropods, and nematodes (Fay et al.
, including marine worms, segmented worms and leeches have their blood green.
39-57), the morphologically disparate eyes of annelids
may not function using homologous molecular components of phototransduction.