Belongs within: Euopisthobranchia.
The Aglajidae are a cosmopolitan group of headshield slugs in which the shell is internal, reduced and often not calcified, and the visceral shield is posteriorly extended into swallowtail-like lobes.
<==Aglajidae [Sinistrobranchia, Sinistrobranchidae]BR17
|--PosterobranchaeaBR05
|--Doridium Meckel 1809 [Doridiidae, Doridiina, Doridiinae]BR05
| `--*D. membranaceum Meckel 1809BR17 [=Aglaja membranaceaO27]
|--Navanax Pilsbry 1895O27
| `--*N. inermis Cooper 1862O27
|--Acera Cuvier 1810 (nom. rej.)BR17
| |--*A. carnosa Cuvier 1810BR17
| `--A. bullataM05
|--Chelidonura Adams 1850 [Chelidonuridae]BR05
| |--*C. hirundinina (Quoy & Gaimard 1833) [=Bulla hirundinina]BR17
| |--C. adamsiiBRW98
| |--C. amoena Bergh 1905BW09
| |--C. inermis (Cooper 1863)PP78
| |--C. pallida Risbec 1951WBS-S15
| `--C. tsurugensis Baba & Abe 1964WBS-S15
|--PhilinopsisBW09
| |--P. gardineri (Eliot 1903)WBS-S15
| |--P. nigra Pease 1860K65
| |--P. pilsbryi (Eliot 1900)BW09
| |--P. reticulata (Eliot 1903)BW09
| |--P. speciosa Pease 1860K65
| `--P. taronga [incl. Chelidonura aureopunctula]HS01
|--Aglaja Renier 1807BR05
| |--*A. tricolorata Renier 1807BR17
| |--A. adellae Dall 1894O27
| |--A. cylindrica (Cheeseman 1881)P61
| |--A. diomedia Bergh 1894O27
| |--A. marmorata (Smith 1884) [=Doridium marmoratum]H09
| |--A. ocelligera (Bergh 1894) [=Doridium ocelligerum]O27
| `--A. purpurea Bergh 1894O27
|--MelanochlamisWBS-S15
| |--M. cylindricaHS01
| `--M. diomedeaGAS03
`--Odontoglaja guamensis Rudman 1978WBS-S15
*Type species of generic name indicated
References
[BRW98] Beesley, P. L., G. J. B. Ross & A. Wells (eds) 1998. Fauna of Australia vol. 5. Mollusca: The Southern Synthesis. Part A. Australian Biological Resources Study: Canberra.
[BR05] Bouchet, P., & J.-P. Rocroi. 2005. Classification and nomenclator of gastropod families. Malacologia 47 (1–2): 1–397.
[BR17] Bouchet, P., J.-P. Rocroi, B. Hausdorf, A. Kaim, Y. Kano, A. Nützel, P. Parkhaev, M. Schrödl & E. E. Strong. 2017. Revised classification, nomenclator and typification of gastropod and monoplacophoran families. Malacologia 61 (1–2): 1–526.
[BW09] Bryce, C., & C. Whisson. 2009. The macromolluscs of Mermaid (Rowley Shoals), Scott and Seringapatam Reefs, Western Australia. Records of the Western Australian Museum Supplement 77: 177–208.
[GAS03] Gulbin, V. V., I. S. Arzamastsev & V. M. Shulkin. 2003. Ecological monitoring of the water area of Port Vostochnyi (Wrangel Bay) in the Sea of Japan (1995–2002). Russian Journal of Marine Biology 29 (5): 284–295.
[HS01] Hayward, B. W., A. B. Stephenson, M. S. Morley, W. M. Blom, H. R. Grenfell, F. J. Brook, J. L. Riley, F. Thompson & J. J. Hayward. 2001. Marine biota of Parengarenga Harbour, Northland, New Zealand. Records of the Auckland Museum 37: 45–80.
[H09] Hedley, C. 1909. The Marine Fauna of Queensland: Address by the President of Section D. Australasian Association for the Advancement of Science: Brisbane.
[K65] Kay, E. A. 1965. Marine molluscs in the Cuming collection, British Museum (Natural History) described by William Harper Pease. Bulletin of the British Museum (Natural History): Zoology Supplement 1: 1–96, 14 pls.
[M05] Meisenheimer, J. 1905. Die arktischen Pteropoden. In: Römer, F., & F. Schaudinn (eds) Fauna Arctica. Eine Zusammenstellun der arktischen Tierformen, mit besonder Berücksichtigung des Spitzbergen-Gebietes auf Grund der Ergebnisse der Deutschen Expedition in das Nördliche Eismeer im Jahre 1898 vol. 4 pp. 407–430. Gustav Fischer: Jena.
[O27] Oldroyd, I. S. 1927. The Marine Shells of the West Coast of North America vol. 2 pt 1. Stanford University Press: Stanford University (California).
[PP78] Poorman, F. L., & L. H. Poorman. 1978. Additional molluscan records from Bahía de Los Angeles, Baja California Norte. Veliger 20 (4): 369–374.
[P61] Powell, A. W. B. 1961. Shells of New Zealand: An illustrated handbook 4th ed. Whitcombe and Tombs Limited: Christchurch.
[WBS-S15] Willan, R. C., C. Bryce & S. M. Slack-Smith. 2015. Kimberley marine biota. Historical data: molluscs. Records of the Western Australian Museum Supplement 84: 287–343.