as far as I remember, archangels and angels and cherubim and seraphs are the only ones with distinctive biblical references.
That is not correct. All nine choirs of angels are explicity mentioned in the Bible in several places. Here are a few cites:
Seraphim. Isaias 6:1-2.
1 In the year that king Ozias died, I saw the Lord sitting upon a throne high and elevated: and his train filled the temple. 2 Upon it stood the seraphims: the one had six wings, and the other had six wings: with two they covered his face, and with two they covered his feet, and with two they hew.
Cherubim. Genesis 3:24.
21 And the Lord God made for Adam and his wife, garments of skins, and clothed them. 22 And he said: Behold Adam is become as one of us, knowing good and evil: now, therefore, lest perhaps he put forth his hand, and take also of the tree of life, and eat, and live for ever. 23 And the Lord God sent him out of the paradise of pleasure, to till the earth from which he was taken. 24 And he cast out Adam; and placed before the paradise of pleasure Cherubims, and a flaming sword, turning every way, to keep the way of the tree of life.
Principalities, Powers, Virtues, and Dominations. Ephesians, 1:21.
16 Cease not to give thanks for you, making commemoration of you in my prayers, 17 That the God of our Lord Jesus Christ, the Father of glory, may give unto you the spirit of wisdom and of revelation, in the knowledge of him: 18 The eyes of your heart enlightened, that you may know what the hope is of the glory of his inheritance in the saints. 19 And what is the exceeding greatness of his power towards us, who believe according to the operation of the might of his power, 20 Which he wrought in Christ, raising him up from the dead, and setting him on his right hand in the heavenly places.
21 Above all principality, and power, and virtue, and dominion, and every name that is named, not only in this world, but also in that which is to come. 22 And he hath subjected all things under his feet, and hath made him head over all the church, 23 Which is his body, and the fulness of him who is filled all in all.
Thrones. Colossians 1:16.
16 For in him were all things created in heaven and on earth, visible and invisible, whether thrones, or dominations, or principalities, or powers: all things were created by him and in him. 17 And he is before all, and by him all things consist.
Archangels. I Thessalonians 4:15.
15 For the Lord himself shall come down from heaven with commandment, and with the voice of an archangel, and with the trumpet of God: and the dead who are in Christ, shall rise first.
Angels. I Peter 3:22.
21 Whereunto baptism being of the like form, now saveth you also: not the putting away of the filth of the flesh, but the examination of a good conscience towards God by the resurrection of Jesus Christ. 22 Who is on the right hand of God, swallowing down death, that we might be made heirs of life everlasting: being gone into heaven, the angels and powers and virtues being made subject to him.
There are several more references to the choirs of angels in Sacred Scripture, and all nine are contained therein.
