In synonymy:
Ihurakius Marples, 1959 = Megadictyna Dahl, 1906 (Lehtinen, 1967: 240)

type Megadictyna thilenii Dahl, 1906; gender feminine

N.B.: transferred from the Nicodamidae to the Megadictynidae by Dimitrov et al., 2017: 239, as already assumed by Murphy & Roberts, 2015: ix; considered a senior synonym of Ihurakius Marples, 1959b: 359 [urn:lsid:nmbe.ch:spidergen:05034] (type I. forsteri Marples, 1959 = Megadictyna thilenii Dahl, 1906) by Forster in Lehtinen, 1967: 240.

Transferred to other genera:
Megadictyna marplesi Forster, 1970 -- see Forstertyna

In synonymy:
Megadictyna forsteri (Marples, 1959, T from Ihurakius) = Megadictyna thilenii Dahl, 1906 (Forster in Lehtinen, 1967: 240).

Megadictyna thilenii Dahl, 1906b: 63 (Df).
Ihurakius forsteri Marples, 1959b: 359, f. III.2-3 (Dmf) [urn:lsid:nmbe.ch:spidersp:054634].
Megadictyna thileniusi Lehtinen, 1967: 240, f. 18 (f, S of Ihurakius forsteri).
Megadictyna thileniusi Forster, 1970b: 178, f. 20, 505, 518-530 (mf).
Megadictyna marplesi Forster, 1970b: 181, f. 531-532 (m; misidentified per Harvey, 1995: 382).
Megadictyna thileniusi Coddington, 1990: 10, f. 31 (m).
Megadictyna thilenii Harvey, 1995: 378, f. 193-198 (mf; N.B.: Bonnet's emendation to thileniusi considered invalid).
Megadictyna thilenii Griswold et al., 2005: 32, f. 171A-C (m).
Megadictyna thilenii Paquin, Vink & Dupérré, 2010: 63, f. 35.1-4 (mf).
Megadictyna thilenii Polotow, Carmichael & Griswold, 2015: 142, f. 10D, 13A (m).