agnathan in a sentence
1) Agnathans have gill arches but no jaws.
2) Their classification as agnathans places hagfish as elementary vertebrates in between invertebrates and gnathostomes.
3) There is also considerable scope for informed speculation about the feeding mechanisms among the extinct agnathans .
agnathan example sentences
4) But this may be misleading because agnathan globin is homologous with both gnathostome myoglobin and haemoglobin.5) On the right there are two schemes including fossil agnathan groups congruent with the classifications to the left.
6) There have been several suggestions as to how fossil agnathans may fit into a scheme such as this.
7) FIG. 4 Our favoured phylogenetic tree of principal agnathan groups with stratigraphic ranges superimposed (bold black lines).
8) The acquisition of many gnathostome characters occurred through several transformation series which can be traced across the phylogeny of agnathans .
9) In the Palaeozoic there were several different groups of agnathans showing a wide variety of morphology of bony dermal armour.
10) Galeaspids (Galeaspida) were very unusual agnathans , also with solid head shields, and restricted to eastern Asia.
11) Ampullary receptors are ancestral to jawed fish, for lampreys and agnathans were found to have ampullary receptors 400 million years earlier.
12) Fish hemoglobins, with the exception of the agnathans , are tetramers that exhibit cooperativity of O2 binding and have sigmoidal OECs.
13) One of the earliest known armoured agnathan ("ostracoderm") vertebrate, "Arandaspis", dates from the Middle Ordovician.
14) B, a, This theory suggests that lampreys are more closely related to gnathostomes than to hagfishes ( agnathans are considered paraphyletic).
15) A, b, This classification assumes that the fossil groups are related to one or other of the Recent agnathans (galeaspids were not known at this time).
example sentences with agnathan
16) The discovery of many new facts and new types of agnathans with hitherto unknown anatomical features has questioned some of our traditional ideas.17) Usually, one or other fossil group is considered more closely related to gnathostomes than to any other agnathan , living or fossil.
18) Fossil agnathan groups, such as the heterostracans, anaspids and osteostracans were considered related to one or other of the modern types (Fig. 2A, b).
19) Agnathans are represented today by
20) (4) Another new agnathan body form was revealed with the recent discovery of pituriaspids from the Middle Devonian of Australia (Fig. 1 g).
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