Harpinia species

King, Rachael A., Myers, Alan A. & McGrath, David, 2004, A review of shallow-water Irish and British Harpinia Boeck (Crustacea: Amphipoda: Phoxocephalidae) species including the first detailed descriptions of the males of Harpinia laevis Sars and Harpinia pectinata Sars, Journal of Natural History 38 (10), pp. 1263-1286 : 1282-1284

Key to the shallow-water Harpinia species of Ireland, Britain and adjacent waters

1 Antennae with tufts of fine long setae (see figure 13A); uropod 3 elongate, similar length or longer than uropod 1 (see figure 13B).......... 8

– Uropod 3 not elongate, distinctly shorter than uropod 1 (see figure 13C); antennae without fine tufts of setae (see figure 13D)............ 2

2 Epimeral plate 3 posterodistal corner with large, distinct spine (see figure 13E).. 3

– Epimeral plate 3 posterodistal corner not forming a large distinct spine (see figure 13F–I).................... 6

3 Coxae 1–3 with posterodistal spines (see figure 13J)......... 5

– Coxae 1–3 without posterodistal spines (see figure 13K)........ 4

4 Pereopod 7 basis with 10+ small distinct spines with long marginal setae (see figure 13La, b); uropod 3 inner ramus as long as article 1 of outer ramus; epimeron 3 with distinct row of oblique setae.......... H. antennaria X

– Pereopod 7 basis with 5+ large distinct spines with long marginal setae (see figure 13La, b); uropod 3 inner ramus distinctly smaller than article 1 of outer ramus; epimeron 3 without distinct row of oblique setae....... H. serrata X *

5 Pereopod 7 basis with six to eight distinct spines (see figure 13La) and with short marginal setae (see figure 12Ma); epimeron 3 with row of oblique setae, lacking setae on ventral margin.............. H. pectinata X

– Pereopod 7 with 8+ distinct spines and with long marginal setae (see figure 13La, b); epimeron 3 without row of oblique setae, with row of setae on ventral margin...................... H. dellavallei X *

6 Pereopod 7 basis with very short marginal setae, with indistinct marginal spines (see figure 13Ma, b); epimeron 3 without small spine(s) on lower margin of notch (see figure 13F, H).................... 7

– Pereopod 7 basis with long marginal setae, with distinct marginal spines (some with double apices) (see figure 13La, b); epimeron 3 with small spine(s) below notch (see figure 13I)................. H. crenulata X

7 Epimeron 3 posterodistal corner rounded with a simple notch and seta (see figure 13H), without row of oblique setae; uropod 3 inner ramus without long apical seta; pereopod 7 basis with around eight indistinct marginal spines (see figure 13Mb), distal margin rounded.............. H. laevis X

– Epimeron 3 posterodistal corner rounded with an excavated notch and seta (see figure 13F), with a row of oblique setae; uropod 3 inner ramus with long apical seta; pereopod 7 basis with around six indistinct spines (see figure 13Mb), distal margin truncated................. H. truncata X *

8 Epimeron 3 posterodistal corner with defined spine (see figure 13E)..... 9

– Epimeron 3 posterodistal corner without defined spine (see figure 13F–I)... 10

9 Coxae 1–3 with posterodistal spines (see figure 13J), uropod 3 inner ramus almost as long as entire outer ramus; pereopod 7 basis with six to seven indistinct spines with short marginal setae (see figure 13Ma, b)....... H. pectinata W

– Coxae 1–3 without posterodistal spines (see figure 13K); uropod 3 inner ramus a little longer than article 1 of outer ramus; pereopod 7 basis with up to five indistinct spines with short marginal setae (see figure 13Ma, b)..... H. antennaria W

10 Uropod 3 inner ramus about three-quarters length of article 1 of outer ramus, lacking apical seta; epimeron 3 rounded with excavated notch and seta and no spine below notch (see figure 13F)............. H. crenulata W

– Uropod 3 inner ramus as long as article 1 of outer ramus and with long apical seta; epimeron 3 with excavated notch and seta with very small blunt spine below notch (see figure 13G)................ H. laevis W