+
+| Character |
+
+
+Megapleonum falx
+
+sp. nov.
+ |
+
+
+Megapleonum ferrumequinum
+
+sp. nov.
+ |
+
+
+Megapleonum wangjiani
+
+sp. nov.
+ |
+
+
+Megapleonum yangdongense
+
+sp. nov.
+ |
+
+
+Megapleonum ehuangzhang
+ |
+
+Megapleonum shenzhen
+ |
+
+
+
+| Carapace |
+
+Dense long setae at lateral margins, epigastric cristae and postorbital cristae confluent (Fig.
+1 A
+)
+ |
+
+Dense long setae at lateral margins, epigastric cristae and postorbital cristae almost confluent (Fig.
+3 A
+)
+ |
+
+Sparse short setae at lateral margins, epigastric cristae and postorbital cristae almost confluent (Fig.
+5
+)
+ |
+
+No setae at lateral margins, epigastric cristae and postorbital cristae confluent (Fig.
+8
+)
+ |
+
+No setae at lateral margins, epigastric cristae and postorbital cristae confluent (
+Huang et al. 2018
+: fig. 2)
+ |
+
+No setae at lateral margins, epigastric cristae and postorbital cristae confluent (
+Huang and Mao 2021
+: fig. 1)
+ |
+
+
+| Maxilliped 3 exopod |
+
+With long flagellum (Fig.
+2 A
+)
+ |
+
+With no flagellum (Fig.
+4 A
+)
+ |
+
+With no flagellum (Fig.
+7 A
+)
+ |
+
+With short flagellum (Fig.
+10 A
+)
+ |
+
+With no flagellum (
+Huang et al. 2018
+: fig. 3 D)
+ |
+
+With vestigial flagellum (
+Huang and Mao 2021
+: fig. 3 A)
+ |
+
+
+| Ambulatory legs |
+
+With dense long setae (Fig.
+1 A
+)
+ |
+
+With dense long setae, particularly pereiopods 2 and 3 (Fig.
+3 A
+)
+ |
+
+With dense long setae, particularly pereiopods 2 and 3 (Fig.
+5
+)
+ |
+
+With short setae (Fig.
+8
+)
+ |
+
+With short setae (
+Huang et al. 2018
+: fig. 2)
+ |
+
+With short setae (
+Huang and Mao 2021
+: fig. 1)
+ |
+
+
+| Male anterior thoracic sternum width length ratio |
+1.8 |
+1.9 |
+2.0 |
+1.9 |
+
+1.9 (
+Huang et al. 2018
+)
+ |
+
+1.9 (
+Huang and Mao 2021
+)
+ |
+
+
+| Male pleonite 6 width to length ratio |
+2.6 |
+2.5 |
+2.6 |
+2.4 |
+
+2.6 (
+Huang et al. 2018
+)
+ |
+
+2.6 (
+Huang and Mao 2021
+)
+ |
+
+
+| Male telson width to length ratio |
+1.8 |
+1.7 |
+1.8 |
+1.8 |
+
+1.7 (
+Huang et al. 2018
+)
+ |
+
+2.0 (
+Huang and Mao 2021
+)
+ |
+
+
+| G 1 terminal segment |
+
+Strongly tapering, sickle shaped (Fig.
+2 F, G
+)
+ |
+
+Long and curved with horseshoe shaped structure (Fig.
+4 F – H
+)
+ |
+
+Short, rounded, distal-ventral region with long setae, tip presenting as protrusion on outer margin (Fig.
+11 A, B
+)
+ |
+
+Short, bifurcated, prong shaped (Fig.
+11 C, D
+)
+ |
+
+Bent outwards and folded inwards with large flap on ventral side (
+Huang et al. 2018
+: fig. 3 C)
+ |
+
+Stout, goose-head-shaped (
+Huang and Mao 2021
+: fig. 4 G)
+ |
+
+
+| G 2 subterminal segment proximal region |
+
+Small (Fig.
+2 B
+)
+ |
+
+Small (Fig.
+4 B
+)
+ |
+
+Very small (Fig.
+7 B
+)
+ |
+
+Large (Fig.
+10 B
+)
+ |
+
+Large (
+Huang et al. 2018
+: fig. 3 A)
+ |
+
+Large (
+Huang and Mao 2021
+: fig. 3 B)
+ |
+
+
+| Female pleon |
+Ovate |
+Ovate |
+
+Ovate (Fig.
+6 E
+)
+ |
+
+Ovate (Fig.
+9 E
+)
+ |
+
+Linguiform (
+Huang et al. 2018
+: fig. 4 C)
+ |
+
+Linguiform (
+Huang and Mao 2021
+: fig. 2 E)
+ |
+
+
+