Updated checklist and identification key of benthic tanaidaceans (Crustacea Peracarida) of the sublittoral zone of the northern Yucatan Peninsula, Mexico Author Abarca-Ávila, Mónica Mariel Author Herrera-Dorantes, María Teresa Author Winfield, Ignacio Author Ardisson, Pedro-Luis text Zootaxa 2019 2019-12-13 4711 1 51 76 journal article 24636 10.11646/zootaxa.4711.1.2 a23fcefa-299b-4695-be53-d3d82b0c7677 1175-5326 3573454 B3FFF924-44D6-403A-87B4-62EA2E2907D2 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