Haustorioides, Oldevig, 1958

Ogawa, Hiroshi, Takada, Yoshitake & Sakuma, Kay, 2021, A New Species of the Sand-burrowing Dogielinotidae, Haustorioides furotai, from Tokyo Bay, Japan (Crustacea: Amphipoda), Species Diversity 26, pp. 65-78 : 76-77

Key to species of Haustorioides

1. Telson wider than long, distally truncated, cleft to medium (about 1/4 of length)........................ 2

— Telson cleft and longer than wide, or uncleft, slightly rounded or slightly acute distally.................. 4

2. Peduncle of uropod 1 armed with 14–15 long setae on lateral margin........................... H. magnus

— Peduncle of uropod 1 armed with less than 12 long setae on lateral margin........................... 3

3. Dactylus of pereopod 5 claw-shaped, merus of pereopod 6 with posterodistal lobe and overlapping to carpus, carpus of pereopod 6 about 2 times longer than the wide............................... H. koreanus

— Dactylus of pereopod 5 knife-shaped, merus of pereopods 6 without posterodistal lobe, length in carpus of pereopod 6 subequal to the wide..... H. munsterhjelmi

4. Telson cleft to medium........................... 5

— Telson with small notch or uncleft................. 6

5. Peduncle of uropod 1 armed with 5–7 long setae on lateral margin; epimeral plate 2 with small tooth on posterodistal corner, on epimeral plate 3 strongly concaved dorsally; telson cleft to the middle (about 1/3), subequal length to width.............. H. gurjanovae

— Peduncle of uropod 1 with only 1 seta on distrolateral corner, without medium marginal setae; posterodistal corners on epimeral plates 2 and 3 with medium teeth; telson longer than wide, cleft to the middle (about 1/4).................................. H. latipalpus

6. Posterodistal corners of epimeral plates 2 and 3 with sharp teeth, elongated straightly......... H. japonicus

— Posterodistal corners of epimeral plates 2 and 3 with small teeth...................................... 7

7. Palp of maxilla 1 with 1 apical seta; telson longer than wide, subtruncated distally, very shallowly cleft; basis of male gnathopod 1 with 6 long setae on posterior margin............................... H. nesogenes

— Palp of maxilla 1 without setae; telson uncleft, distal tip acute or slightly rounded; basis of male gnathopod 1 with 3 long setae on posterior margin.............. 8

8. Inner lobe of maxilliped not reaching beyond the lateral margin of 1st article of palp; each merus of pereopod 3–4 without posterodorsal lobe; dactylus of pereopod 7 with>10 setae and about 0.7 times as long as propodus; telson wider than long.............. H. littoralis

— Inner lobe of maxilliped reaching beyond the lateral margin of 1st article of palp; each merus of pereopod 3–4 with posterodorsal lobe; dactylus of pereopod 7 with <8 setae and about 0.5 times as long as propodus; telson is longer than wide or length and width subequal.......................................... 9

9. Distal margin of labrum distinctly emarginated; outer lobe of maxilliped right-angled on distromedial corner; basis of male gnathopod 1 with 3 small setae anterodistally, 6 long setae posteriorly; coxal plate of pereopod 3 with 6 long marginal setae anteriorly...... H. indivisus

— Labrum subtruncated distally, not emarginated; outer lobe of maxilliped acute-angled on distromedial corner; basis of male gnathopod 1 with 2 small setae anterodistally, 3 long setae posteriorly; coxal plate of pereopod 3 with 3 long marginal setae anteriorly.........• • • • • • • • • • • • • • • • • • • • • • • • • • • • • H. furotai sp. nov.