Apseudomorpha, Miller, 1940

Abarca-Ávila, Mónica Mariel, Herrera-Dorantes, María Teresa, Winfield, Ignacio & Ardisson, Pedro-Luis, 2019, Updated checklist and identification key of benthic tanaidaceans (Crustacea Peracarida) of the sublittoral zone of the northern Yucatan Peninsula, Mexico, Zootaxa 4711 (1), pp. 51-76 : 70-71

Suborder Apseudomorpha

1. Pereopod-1 with coxal spine............................................................................ 2

- Pereopod-1 without coxal spine......................................................................... 3

2. Antennule with peduncle bearing two or three spines and without small tubercles on inner margin; basis of pereopod-1 with three or four spines.............................................................. Hoplopolemius propinquus

- Antennule with peduncle lacking spines and with small tubercles on inner margin; basis of pereopod-1 without spines.................................................................................. Paradoxapseudes bermudeus

3. Body asymmetrical; with specialized suction setae on posterior pereopods..................... Pagurotanais largoensis

- Body symmetrical; without specialized suction setae on posterior pereopods...................................... 4

4. Without eyes; dactylus of pereopods 1–6 with sensorial setae (aesthetascs); pereopod-1 with carpus and propodus broad; pleon with pleonites unfused................................................................................. 5

- With eyes; dactylus of pereopods 1–6 without sensorial setae; pereopod-1 with carpus and propodus narrow; pleon with pleonites totally or partially fused............................................................................ 7

5. Mandibular palp, carpus, and propodus of cheliped with a row of numerous long plumose setae on inner margin; pereopod-1 with dactylus having a sensory organ with numerous long terminal setae......................................... 6

- Mandibular palp with one simple terminal setae; carpus and propodus of cheliped with long simple setae on inner margin; pereopod-1 with dactylus having three spines on ventral margin and curled sensory setae on dorsal margin......................................................................................... Psammokalliapseudes granulosus

6. Mandibular palp with simple terminal setae; cheliped fixed finger about quarter length of dactylus............................................................................................... Mesokalliapseudes bahamensis

- Mandibular palp without simple terminal setae; cheliped fixed finger about two-thirds length of dactylus......................................................................................... .. Mesokalliapseudes macsweenyi

7. Rostrum bilobed......................................................................... Synapseudes sp.

- Rostrum not bilobed.................................................................................. 8

8. Oval body........................................................................... Cyclopoapseudes sp.

- Elongated body...................................................................................... 9

9. Rostrum sub-triangular, with subacute anterior process and crenulated margin...................... Apseudomorpha sp.

- Rostrum rounded, without anterior process and smooth margin................................................ 10

10. Rostrum with small subapical spine; first article of antennule with inner margin without spines; inner margin of pereopod-1 basis without spines....................................................................... Parapseudes sp.

- Rostrum without a subapical spine; first article of antennule with inner margin with two spines; inner margin of pereopod-1 basis with five or six spines............................................................... Calozodion wadei