Agnatha

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Agnatha

aquatic, jawless, fish-like vertebrates characterized by fewer than two pairs of limbs (fins). The group is often given the status of a subphylum to separate it from other vertebrates with jaws which are included in the subphylum Gnathostomata. The Agnatha includes lampreys, hagfish, and the fossil OSTRACODERMI.
References in periodicals archive ?
Luksevics in the Department of Geology, Faculty of Geography and Earth Sciences, University of Latvia), 1.42.738.2017 and 3.42.1103.2016 (collecting the agnathan and fish remains from the Gauja and Amata deposits of the Baltic Region and comparison of vertebrate assemblages).
The first assemblage of vertebrates to be described from the Eastport Formation of Maine, USA, includes agnathan remains comprising scale fragments of osteostracans and anaspids, and scales of thelodonts.
Because the evidence of these fish, called agnathans, is scant and fragmentary, scientists know little about the agnathans' appearance or about their evolutionary history.
Many types of SS have been cloned with the same amino acid (aa) sequence in vertebrates subsequently, from agnathans to mammals (Conlon et al., 1997).
The agnathans, chondrichthyans, and functionality of fish aquaporins generally have received little attention.
In Reproductive biology and phylogeny of fishes (agnathans and bony fishes): phylogeny, reproductive system, viviparity, spermatozoa.
Reproductive biology and phylogeny of fishes (agnathans and bony fishes); phylogeny, reproductive system, viviparity, spermatozoa.
Kompleksy srednedevonskikh psammosteidnykh beschelyustnykh vostochnoj chasti Glavnogo devonskogo polya [The assemblages of Middle Devonian psammosteid agnathans from the eastern part of the Main Devonian Field].
Electrolocation has been documented among agnathans (Bodznick and Northcutt, 1981), amphibians (Himstedt et al., 1982), chondrosteans (Wilkens et al., 1997), mammals (Scheich et al., 1986; Czech-Damal et al., 2012), sarcopterygians (Northcutt, 1980), and teleosts (Alves-Gomes, 2001).
In 1975 a palaeontological expedition from Gottingen and Cologne universities (Germany) visited Arctic Canada (Langenstrassen & Schultze 1996) and inter alia collected agnathans and gnathostomes in Lower Devonian localities on the northern part of Prince of Wales Island (Fig.