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Stebbing, 1906: 210.
Barnard, 1930: 345 (references).
Barnard, 1932: 115–117.
“Integument more or less indurated, processiferous. Head rostrate. Side-plates well developed, 1st-4th usually acuminate. Eyes well developed. Antennae 1 and 2 seldom elongate or very different in length, accessory flagellum absent or rudimentary. Mouthparts projecting downward, and drawn out as if for piercing rather than biting. Gnathopod 1 very slender and feeble, simple or chelate; gnathopod 2 seldom strong, Peraeopods 3–5, 2nd joint expanded, usually acute at one or more points of hind margin. Uropod 3, rami lanceolate. Telson unarmed, apically emarginate”—Stebbing.
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A considerable number of new genera have been added to this family since Stebbing's definition of 1906, and a further one is added in this paper. By far the greater number are southern in distribution.
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| 1. | Maxilla 1 palp of 1 segment | 2 | |
| Maxilla 1 palp of 2 segments | 3 | ||
| 2. | Gnathopod 2 slender and chelate | Pariphimedia Chevreux, 1906 | |
| Gnathopod 2 subchelate and robust | Odius Lilljeborg. 1865 | ||
| 3. | Maxilla 1 palp falling greatly short of outer plate apex | 4 | |
| Maxilla 1 palp reaching apex of outer plate | 6 | ||
| 4. | Gnathopods 1 and 2 simple | Panoploeopsis Kunkel, 1910 | |
| Gnathopod 1 minutely chelate, gnathopod 2 not simple | 5 | ||
| 5. | Gnathopod 2 subchelate; maxilliped, 2nd segment of palp not produced along inside 3rd; lower lip incised | Panoploea G. M. Thomson, 1880 | |
| Gnathopod 2 chelate; maxilliped, 2nd segment of palp produced along inside 3rd; lower lip not incised | Anchiphimedia Barnard, 1930 | ||
| 6. | Mandible tapering to smooth symmetrical spoon-shaped apex | 7 | |
| Mandible not as above | 8 | ||
| 7. | Upper lip rounded, not incised; lower lip incised | Labriphimedia Barnard, 1932 | |
| Upper lip squarish, incised, lower lip incised | Maoriphimedia n.g | ||
| 8. | Gnathopod 1 simple | 9 | |
| Gnathopod 1 chelate | 12 | ||
| 9. | Telson entire, rounded; upper lip incised; gnathopods both well developed; body very strongly processiferous | Acanthonotozomoides Schellenberg, 1931 | |
| Telson distally notched or emarginate | 10 | ||
| 10. | Gnathopod 1 feeble, very slender; gnathopod 2 shorter and stouter | Acanthonotozoma Boeck, 1876 | |
| Gnathopods 1 and 2 alike, well developed | 11 | ||
| 11. | Body not strongly processiferous, lateral processes negligible; upper lip asymmetrically lobed; maxilliped palp shorter than outer plate; mandible pointed | Iphimediopsis * Schellenberg. 1931 | |
| Body very strongly processiferous, strongly developed lateral processes; maxilliped palp longer than outer plate; mandible distally broad | Acanthonotozomella Schellenberg, 1926 | ||
| 12. | Mandible cutting edge drawn out in long needle-like apex; maxilliped palp has small 4th segment; upper and lower lips not incised | Parapanoploea Nicholls. 1938 | |
| Mandible not as above | 13 | ||
| 13. | Maxilla 1 palp enormously expanded into ovate lamina; upper lip asymmetrically incised; lower lip not incised; mandible short and broad but thin | Maxilliphimedia Barnard, 1930 | |
| Not as above | 14 |
[Footnote] * Nicholls (1938) has pointed out that this name is preoccupied and will have to be replaced.
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| 14. | Upper and lower lips not incised; maxilliped palp 1st and 2nd segments not broadened, 2nd segment not produced along inside 3rd; mandible cutting edge not broad, not strongly toothed | Iphimediella Chevreux, 1913 | |
| Not as above | 15 | ||
| 15. | Upper lip emarginate; lower lip incised; maxilliped palp not particularly broadened, 2nd segment produced along inside 3rd though somewhat obtusely | Iphimedia Rathke, 1843 | |
| Not as above | 16 | ||
| 16. | Upper lip strongly incised; maxilliped palp 1st and 2nd segments broadened | Pseudiphimediella Schellenberg, 1931 | |
| Upper lip entire; maxilliped palp 1st and 2nd segments not broadened | 17 | ||
| 17. | Mandibles short and stout with apices transformed in adult into broad oval grinding surfaces; epistome wide and very short | Gnathiphimedia Barnard, 1930 | |
| Not as above | 18 | ||
| 18. | Cutting edge of mandible entire | Echiniphimedia Barnard, 1930 | |
| Cutting edge of mandible toothed | Pariphimediella Schellenberg, 1931 |
Although only three species are here recorded from New Zealand, it is extremely probable, if the Discovery and Terra Nova Reports are any indication, that any sustained dredging programme in New Zealand waters will add a considerable number of species.