Laophontodes, T. SCOTT, 1894

KEY TO SPECIES OF LAOPHONTODES T. SCOTT, 1894 View in CoL The genus currently accommodates 15 valid species ( Tables 1 and 4). L. propinquus Brady, 1910 (species incertae sedis), L. antarcticus Brady, 1918 and L. ornatus Krishnaswamy, 1957 (both species inquirendae; cf. Table 4) are excluded from the key below, which is applicable to both sexes (except for couplet 4).

1. Cephalothorax with paired posterolateral, backwardly directed, corniform processes; posterior margins of body somites crenulate ……………… bicornis View in CoL group ................................................................................... 2.

– Cephalothorax without paired posterolateral, backwardly directed, corniform processes; posterior margins of body somites not crenulate ....................................................................................................................... 6.

2. P3–P4 exp-3 without inner seta ………………………………… L. bicornis A. Scott, 1896 sensu Kim (2013) View in CoL .

– P3–P4 exp-3 with inner seta ..........................................................................................................................3.

3. P3 enp- 2 ♀ with outer spine …………………………………………………………… L. bicornis A. Scott, 1896 View in CoL .

– P3 enp- 2 ♀ without outer spine .....................................................................................................................4.

4. P4 enp-2 with outer spine/seta ......................................................................................................................5.

– P4 endopod with armature pattern 0.120 or 120 ……………………………………… L. brevis Nicholls, 1944 .

5. P 5 ♂ with total of six setae/spines …………………………… L. horstgeorgei George & Gheerardyn, 2015 View in CoL *.

– P 5 ♂ with total of five setae/spines ……………………………………………… L. hamatus ( Thomson, 1883) View in CoL *.

6. P3 exp-2 with inner seta ................................................................................................................................7.

– P3 exp-2 without inner seta .........................................................................................................................10.

7. P3–P4 exp-3 with one inner seta …………………………………… L. macclintocki Schizas & Shirley, 1994 View in CoL .

– P3–P4 exp-3 with two inner setae .................................................................................................................8.

8. P4 enp- 2 ♀ without outer spine/seta (present in ♂); penultimate somite forming dorsal pseudoperculum covering most of anal somite ……………………………………………………… L. monsmaris George, 2018 View in CoL .

– P4 enp-2 typically with outer spine/seta in both sexes (but note that George & Gheerardyn (2015) recorded intraspecific variability in the presence/absence of the outer element in L. whitsoni View in CoL ); no such pseudoperculum present ................................................................................................................................9.

9. Rostrum with setular tuft along anterior margin; P1 enp-2 claw robust, unipinnate and about half as long as adjacent geniculate seta; all caudal setae (I– VII) located in distal quarter of ramus; outer spine of P1 exp-1 unipinnate with long pinnules along outer margin; P5 exopodal lobe with five elements in ♀ and three in ♂ ……………………………………………………… L. sabinegeorgeae George & Gheerardyn, 2015 View in CoL .

– Rostrum without setular tuft; P1 enp-2 claw slender, naked and almost as long as adjacent geniculate seta; all caudal setae (I–VII) located in distal half of ramus; outer spine of P1 exp-1 bipinnate with short pinnules; P5 exopodal lobe with four elements in both sexes …………………… L. whitsoni T. Scott, 1912 View in CoL .

10. P2 exp-3 with inner seta ..............................................................................................................................11.

– P2 exp-3 without inner seta .........................................................................................................................12.

11. P4 enp-2 with inner seta; inner seta of P3 exp-3 naked and not extending beyond distal margin of segment; distal (pseudo-)segment of P3 endopod ♂ short, not extending beyond apophysis …………………………… ……………………………………………………………………………………………… L. typicus T. Scott, 1894 View in CoL .

– P4 enp-2 without inner seta†; inner seta of P3 exp-3 pinnate/plumose and extending far beyond distal margin of segment; distal (pseudo-)segment of P3 endopod ♂ elongate, clearly extending beyond apophysis …………………………………………………………… L. mourois Arroyo, George, Benito & Maldonado, 2003 View in CoL .

12. P3 exp-3 with inner seta; body dorsoventrally depressed ………………………… L. scottorum George, 2018 View in CoL .

– P3 exp-3 without inner seta; body not markedly depressed .......................................................................13.