Phylladiorhynchus, Baba, 1969

Schnabel, Kareen E. & Ahyong, Shane T., 2019, The squat lobster genus Phylladiorhynchus Baba, 1969 in New Zealand and eastern Australia, with description of six new species, Zootaxa 4688 (3), pp. 301-347 : 304

Key to species of Phylladiorhynchus

1. Carapace without epigastric spines................................................. P. nudus Macpherson, 2008

- Carapace with epigastric spines.......................................................................... 2

2. Carapace with transverse row of 5 epigastric spines (median and 2 on either side of midline). Maxilliped 3 merus with 2 prominent spines on flexor margin............................................................................ 3

- Carapace with transverse row of 2–4 (rarely 6) epigastric spines, none in midline. Maxilliped 3 merus with 1 prominent spine on flexor margin...................................................................................... 6

3. Carapace anterior branchial margin with 2 spines.......................................... P. kermadecensis n. sp.

- Carapace anterior branchial margin with 3 spines............................................................ 4

4. Thoracic sternite 3 anterior margin nearly transverse, with median and lateral projections................................................................................................... P. bengalensis Tirmizi & Javed, 1980

- Thoracic sternite 3 anterior margin moderately convex, with feeble median excavation............................... 5

5. Carapace gastric ridges medially uninterrupted. Antennule article 1 with 4 distal spines (double distolateral spine absent)............................................................................ P. ikedai ( Miyake & Baba, 1965)

- Carapace with at least metagastric ridge medially interrupted. Antennule article 1 with 5 distal spines (double distolateral spine present)................................................................................. P. erebus n. sp.

6. Carapace with 4 epigastric spines of which outermost may be present as a granule and much smaller than inner pair (rarely 6 spines present)....................................................................................... 7

- Carapace with 2 epigastric spines......................................................................... 9

7. Thoracic sternite 3 anterior margin convex, median projection absent. Carapace anterior metagastric ridge medially interrupted. Abdominal tergite 3 usually without posterior transverse ridge.......................... P. pusillus ( Henderson, 1885)

- Thoracic sternite 3 anterior margin biconcave, with obtuse median projection. Carapace anterior metagastric ridge continuous, not medially interrupted. Abdominal tergite 3 with anterior and posterior transverse ridges........................... 8

8. Rostrum lateral margin straight. Antennular lateral-most spine very small to indistinct. Usually at depths> 300 m. ................................................................................................... P. nui n. sp.

- Rostrum lateral margin convex. Antennular lateralmost spine always distinct. Usually at depths <250 m. .. P. australis n. sp.

9. Carapace anterior branchial margin with 2 spines; hepatic spine absent.................... P. integrirostris ( Dana, 1852)

- Carapace anterior branchial margin with 3 spines; hepatic spine present......................................... 10

10. Carapace metagastric ridge between third branchial marginal spines not medially interrupted. Rostrum lateral margins nearly straight. P2–4 dactyli with sharp upright spines at bases of movable spines........................... P. spinosus n. sp.

- Carapace metagastric ridge between third branchial marginal spines scale-like and medially interrupted. Rostrum lateral margins distinctly convex. P2–4 dactyli without sharp upright spines at bases of movable spines.............. P. triginta n. sp.