In synonymy:
Haliger Mello-Leitão, 1943 = Kaira O. Pickard-Cambridge, 1889 (Levi, 1993c: 210, T from Theridiosomatidae)
Macpos Mello-Leitão, 1940 = Kaira O. Pickard-Cambridge, 1889 (Levi, 1977b: 214)
Pronarachne Mello-Leitão, 1937 = Kaira O. Pickard-Cambridge, 1889 (Levi, 1977b: 214)

type Kaira altiventer O. Pickard-Cambridge, 1889; gender feminine

N.B.: original spelling is Kaira, not Caira; type species designation of Kaira gibberosa O. Pickard-Cambridge, 1890 by F. O. Pickard-Cambridge, 1904: 522 invalid, as only one species (Kaira altiventer) was published in 1889; considered a senior synonym of Pronarachne Mello-Leitão, 1937a: 8 [urn:lsid:nmbe.ch:spidergen:05294] (type P. aries Mello-Leitão, 1937 = Kaira altiventer O. Pickard-Cambridge, 1889) and Macpos Mello-Leitão, 1940a: 59 [urn:lsid:nmbe.ch:spidergen:05293] (type M. monstrosus Mello-Leitão, 1940) by Levi, 1977b: 214, and of Haliger Mello-Leitão, 1943a: 180 [urn:lsid:nmbe.ch:spidergen:05295] (type H. corniferus Mello-Leitão, 1943 = Kaira altiventer O. Pickard-Cambridge, 1889), transferred from the Theridiosomatidae, by Levi, 1993c: 210.

Transferred to other genera:
Kaira dromedaria O. Pickard-Cambridge, 1893 -- see Pozonia
Kaira granadensis Mello-Leitão, 1941 -- see Pozonia

In synonymy:
Kaira aries (Mello-Leitão, 1937, T from Pronarachne) = Kaira altiventer O. Pickard-Cambridge, 1889 (Levi, 1977b: 218).
Kaira cornifera (Mello-Leitão, 1943, T from Haliger) = Kaira altiventer O. Pickard-Cambridge, 1889 (Levi, 1993c: 214).
Kaira fasciolata (O. Pickard-Cambridge, 1889, T from Mastophora) = Kaira altiventer O. Pickard-Cambridge, 1889 (Levi, 2003: 325).
Kaira minutissima (Mello-Leitão, 1941) = Kaira gibberosa O. Pickard-Cambridge, 1890 (Levi, 1993c: 216).
Kaira obtusa Keyserling, 1892 = Kaira gibberosa O. Pickard-Cambridge, 1890 (Levi, 1993c: 216).
Kaira spinosa Simon, 1897 = Kaira altiventer O. Pickard-Cambridge, 1889 (Levi, 1977b: 218).

Nomina dubia:
Kaira capra Simon, 1897b: 479 (j, Paraguay) -- Levi, 1993c: 214.
Kaira monstrosa (Mello-Leitão, 1940a: 59, f. 6a-b, f, Brazil, originally in Macpos) -- Levi, 1993c: 216.

Epeira alba Hentz, 1850: 30, pl. 3, f. 7 (Df).
Epeira leucogaster Marx, 1890a: 546.
Kaira alba Keyserling, 1892: 64, pl. 3, f. 50 (f).
Kaira alba McCook, 1894: 202, pl. 12, f. 3 (f).
Kaira alba Levi, 1977b: 216, f. 117-129 (f, Dm).
Kaira alba Levi, 1993c: 216, f. 1-2, 23-28 (mf).
Kaira alba Scharff & Coddington, 1997: 374, f. 16 (m).
Kaira alba Levi, 2002: 559, f. 313 (m).

Epeiroides fasciolata O. Pickard-Cambridge, 1889d: 15, pl. 8, f. 5 (Dm) [urn:lsid:nmbe.ch:spidersp:016375].
Kaira altiventer O. Pickard-Cambridge, 1889d: 56, pl. 8, f. 13 (Df).
Kaira altiventer Keyserling, 1892: 62, pl. 3, f. 48 (f).
Epeiroides fasciolata Keyserling, 1893: 309, pl. 16, f. 228 (m).
Caira spinosa Simon, 1897b: 478 (Df) [urn:lsid:nmbe.ch:spidersp:057758].
Aranea fasciolata F. O. Pickard-Cambridge, 1904: 519, pl. 51, f. 5 (m).
Kaira altiventer F. O. Pickard-Cambridge, 1904: 522, pl. 51, f. 10 (f).
Araneus fasciolatus Petrunkevitch, 1911: 291.
Pronarachne aries Mello-Leitão, 1937a: 9, f. 10 (Df) [urn:lsid:nmbe.ch:spidersp:057755].
Haliger corniferus Mello-Leitão, 1943a: 180, f. 18 (Df) [urn:lsid:nmbe.ch:spidersp:054338].
Kaira altiventer Levi, 1977b: 218, f. 130-137 (f, Dm, S of Kaira spinosa and Pronarachne aries).
Mastophora fasciolata Levi, 1991a: 180 (T from Araneus).
Kaira altiventer Levi, 1993c: 213, f. 3-22 (mf, S of Haliger cornifer).
Kaira altiventer Levi, 2002: 533, f. 8, 10-12 (f).
Kaira altiventer Levi, 2003: 325 (S of Mastophora fasciolata).

Macpos candidissimus Mello-Leitão, 1941f: 212, f. 18-19 (Df).
Kaira candidissima Brignoli, 1983c: 271.
Kaira candidissima Levi, 1993c: 221, f. 66-69 (f).

Kaira cobimcha Levi, 1993c: 223, f. 86-92 (Dmf).

Kaira conica Gerschman & Schiapelli, 1948: 11, f. 11-13 (Df).
Kaira conica Levi, 1993c: 221, f. 70-74 (f).

Kaira dianae Levi, 1993c: 221, f. 61-65 (Df).

Caira echinus Simon, 1897b: 479 (Df).
Kaira echinus Petrunkevitch, 1911: 352.
Kaira echinus Levi, 1993c: 222, f. 75-81 (f, Dm).

Epeira electa Keyserling, 1883a: 196, pl. 15, f. 2 (Dmf).
Epeira electa Keyserling, 1893: 250, pl. 12, f. 186 (m).
Araneus electus Petrunkevitch, 1911: 290.
Kaira electa Levi, 1991a: 179 (T from Araneus).

Kaira erwini Levi, 1993c: 220, f. 52-56 (Df).

Kaira gibberosa O. Pickard-Cambridge, 1890a: 57, pl. 3, f. 12 (Df).
Kaira gibberosa Keyserling, 1892: 63, pl. 3, f. 49 (f).
Kaira obtusa Keyserling, 1892: 66, pl. 3, f. 51 (Dj) [urn:lsid:nmbe.ch:spidersp:057757].
Kaira gibberosa F. O. Pickard-Cambridge, 1904: 522, pl. 51, f. 9 (f).
Wagneriana minutissima Mello-Leitão, 1941c: 250 (Dm [not f]) [urn:lsid:nmbe.ch:spidersp:057756].
Kaira minutissima Levi, 1991b: 373 (T from Wagneriana).
Kaira gibberosa Levi, 1993c: 216, f. 29-47 (mf, S of Kaira minutissima and K. obtusa).

Kaira hiteae Levi, 1977b: 220, f. 138-140 (Dm).
Kaira hiteae Levi, 1993c: 222, f. 82-85 (Df).

Kaira levii Alayón, 1993e: 2, f. 1A-D (Df).

Kaira mbywangiae Pett & Pai-Gibson, 2024: 1000, f. 7-13 (Df).

Kaira sabino Levi, 1977b: 221, f. 141-147 (Df).

Aranea sexta Chamberlin, 1916: 255, pl. 19, f. 7 (Df).
Araneus sexta Levi, 1991a: 259, f. 339-342 (Dmf; N.B.: Chamberlin's f is juvenile).
Kaira sexta Levi, 1993c: 24 (T from Araneus).
Kaira sexta Levi, 2002: 540, f. 93-94 (f).

Kaira shinguito Levi, 1993c: 220, f. 57-60 (Df).

Kaira tulua Levi, 1993c: 220, f. 48-51 (Df).