Tanaidomorpha, Sieg, 1980

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: 71

publication ID

https://doi.org/10.11646/zootaxa.4711.1.2

publication LSID

lsid:zoobank.org:pub:B3FFF924-44D6-403A-87B4-62EA2E2907D2

persistent identifier

http://treatment.plazi.org/id/03D0975F-FFE6-585F-89F1-D742BFB9FDDB

treatment provided by

Plazi

scientific name

Tanaidomorpha
status

 

Suborder Tanaidomorpha 

1. Pleon with last two pleonites fused or reduced; pereopods without ischium....................................... 2

- Pleon with five unfused pleonites; pereopods with ischium.................................................... 3

2. Pereopod-1 with anterior distinct lobe in the coxa; pereopod-6 dactylus with a row of six spines on lateral margin........................................................................................... .. Zeuxo cf. kurilensis 

- Pereopod-1 with or without lobe in the coxa; pereopod-6 dactylus with a row of more than six spines on lateral margin.............................................................................................. Anatanais  sp.

3. Uropodal endopod with two articles; with a plumose seta on lateral margins of first four pleonites.......... Paratanais  sp.

- Uropodal endopod with three or more articles; without plumose setae on lateral margins of pleonites....................4

4. Antennule with three articles.....................................................................5 (females)

- Antennule with six or more articles................................................................12 (males)

5. Uropodal endopod with three or four articles............................................................... 6

- Uropodal endopod with five or six........................................................................9

6. Antennule with proximal article short and broad............................................................ 7

- Antennule with proximal article long and narrow............................................................ 8

7. Cephalothorax with demarcation of the second thoracomere by separation of two carapace plates; uropodal endopod with four articles.............................................................................. Parakonarus juliae 

- Cephalothorax without demarcation of the second thoracomere; uropodal endopod with three articles. Pseudoleptochelia  sp.

8. Distal margin of maxillipedal basis with three pairs of long simple setae; uropodal endopod with three articles in similar length..................................................................... Cacoheterotanais rogerbamberi 

- Distal margin of maxillipedal basis with one or two pairs of long simple setae; uropodal endopod with four articles often of variable length....................................................................... Pseudonototanais  sp.

9. Uropodal endopod with five articles.......................................................... Hargeria rapax 

- Uropodal endopod with six articles...................................................................... 10

10. Uropodal exopod shorter than the first article of endopod.................................................... 11

- Uropodal exopod larger than the first article of endopod................................... Alloleptochelia longimana 

11. Body with small dark dots............................................................... Leptochelia forresti 

- Body without small dark dots..................................................... Leptochelia  sp. aff. savignyi 

12. Uropodal endopod with three or four articles.............................................................. 13

- Uropodal endopod with five or six articles................................................................ 16

13. Chela propo-chelate (normal form)...................................................................... 14

- Chela carpo-chelate (hook form).........................................................................15

14. Chela with fixed finger two-thirds length of dactylus, with a tooth on the subdistal inner margin; antennule with six articles; uropodal endopod with three articles............................................ Cacoheterotanais rogerbamberi 

- Chela with fixed finger three-quarters length of dactylus, without a tooth on the subdistal inner margin; antennule with five articles; uropodal endopod with three articles ……………………………………………. Pseudonototanais  sp.

15. Chela with a prominent carpal process, fixed finger reduced, about quarter length of dactylus; uropodal endopod with four articles … Parakonarus juliae 

- Chela with an underdeveloped, or lacking, carpal process, fixed finger reduced, about quarter length of dactylus; uropodal endopod with four articles............................................................ .. Pseudoleptochelia  sp.

16. Length of the antennule and extended chelipeds of almost two-thirds total length of the body........................ 17

- Length of the antennule and extended chelipeds equal to or greater than the total length of the body.................. 18

17. Post-anal spatulate process present; uropodal endopod with five articles.............................. Hargeria rapax 

- Post-anal spatulate process absent; uropodal endopod with four to six articles............... Leptochelia  sp. aff. savignyi 

18. Body with small dark spots; chela without small teeth on proximal inner margin; fixed finger with a rounded process on subdistal part............................................................................ Leptochelia forresti 

- Body without small dark spots; chela with small teeth on proximal inner margin; fixed finger without rounded process on subdistal part...................................................................... Alloleptochelia longimana