Table 1.
Morphological characters of Sinocorophium hangangense sp. n. and related species with sexually subsimilar antenna 2.<br/>
| Character and distribution | Species | ||||||
|---|---|---|---|---|---|---|---|
| Sinocorophium alienense (♂) | Sinocorophium homoceratum (♂) | Sinocorophium intermedium (♂) | Sinocorophium japonicum (♀) | Sinocorophium monospinum (♀) | Sinocorophium triangulopedarum (♂) | Sinocorophium hangangense sp. n. (♂) | |
| Body length | 6.5 mm | 10–12 mm | 8.0 mm | 6.0 mm | 4.5 mm | 5.5 mm | 12.2 mm |
| Rostrum | subequal to cephalic lobe | subequal to cephalic lobe | subequal to cephalic lobe | vestigial | longer than cephalic lobe | subequal to cephalic lobe | subequal to cephalic lobe |
| Cephalic lobe | subacute | rounded | rounded | weak | rounded | subacute | subacute |
| Antenna 1, peduncular article 1 ventral margin | pinnate setae | 8 teeth | ? | setae | setae | simple setae | simple setae |
| Antenna 1, length of peduncular article 1 to article 2 | = | >> | > | > | > | > | >> |
| Antenna 1, flagellum, # of articles | 13–15 | 16–18 | 17 | 12 | 14 | 17? | 13 |
| Antenna 2, ventrodistal process | 1 | 2 | 1 | 1 | 1 | 1 | 1 |
| Mandible, length of palp articles1 & 2 | proximal < distal | subequal | proximal < distal | subequal | subequal | proximal > distal | proximal < distal |
| Maxilliped, length of outer plate | less than end of palp article 2 | exceeding end of palp article 2 | ? | less than end of palp article 2 | reaching end of palp article 2 | less than end of palp article 2 | less than end of palp article 2 |
| Pereopod 5, posterior margin of basis | setose | setose | ? | not setose | ? | not setose | not setose |
| Uropod 1, lateral margin of peduncle | robust setae | robust setae | ? | robust setae | robust setae | robust setae | slender setae |
| Uropod 1, length of rami | inner < outer | inner << outer | inner << outer | subequal | inner << outer | inner < outer | inner < outer |
| Uropod 3, shape of ramus | ovate | clavate | ovate | ovate | ovate | semi-circular | elongate-ovate |
| Uropod 3, length of ramus | < peduncle | = peduncle | = peduncle | = peduncle | = peduncle | < peduncle | > peduncle |
| Habitat | intertidal | tide-pool | brackish | intertidal | coastal | mangrove marsh | brackish |
| Distribution | San Francisco Bay, California (Chapman 1988) | Tangku, Hopei, Yellow Sea (Yu 1938) | Thanh hoa, Vietam, Gulf of Tongking (Dang 1965) | Tomioka Bay, Kyushu, Japan (Hirayama 1984) | Fenghsien, Kiangsu, East China Sea (Shen 1955) | Mai po, Hong Kong, South China Sea (Hirayama 1990) | Paju-si, Korea (present study) |