
1) Chimaeras and extinct forms 2) Class 3) Subclass holocephali
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https://www.crosswordclues.com/clue/holocephali

The subclass Holocephali (`complete heads`) is a taxon of cartilaginous fish, of which the order Chimaeriformes is the only surviving group.{sfn|Pough|Janis|Heiser|2013|pp=99,101|loc=Table 5-1} This group includes the rat fishes (e.g., Chimaera), rabbit fishes (e.g., Hydrolagus) and elephant fishes (Callorhynchus). They preserve today some featu.....
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http://en.wikipedia.org/wiki/Holocephali

• (n. pl.) An order of elasmobranch fishes, including, among living species, only the chimaeras; -- called also Holocephala. See Chimaera; also Illustration in Appendix.
Found on
http://thinkexist.com/dictionary/meaning/holocephali/
Hol`o·ceph'a·li noun plural [ New Latin , from Greek
'o`los whole +
kefalh` head.]
(Zoology) An order of elasmobranch fishes, including, among living species, only the chimæras; -- called also
Holocephala . See
Chimæra ; also
Illustration in...
Found on
http://www.encyclo.co.uk/webster/H/54

[
n] - chimaeras and extinct forms
Found on
http://www.webdictionary.co.uk/definition.php?query=Holocephali
subclass Holocephali noun chimaeras and extinct forms
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.