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
Author
King, Rachael A.
Author
Myers, Alan A.
Author
McGrath, David
text
Journal of Natural History
2004
2004-05-10
38
10
1263
1286
http://dx.doi.org/10.1080/0022293031000079598
journal article
10.1080/0022293031000079598
1464-5262
Harpinia laevis
(figures 7–9)
Harpinia laevis
Sars, 1895: 161
, pl. 56; Stebbing, 1906: 145; Stephensen, 1942: 156; Lincoln, 1979: 378, figures
175g
, 179a–e.
Material examined
Norway
:
Risør
(
ZMO
F13235)
.
Ireland
:
North West
Mayo
(
NMI 22
1998):
Station Z
1FA (54°20∞
52.5N
, 11°03∞
28.44W
),
355 m
, fine sand;
Station Z
12FC (54°20∞
19.93N
, 11°03∞
40.68W
),
347 m
, fine silty sand;
Station Z
8FA (54°19∞
47.86N
, 11°03∞
25.20W
),
343 m
, fine sand (
W
);
Station Z
2FB (54°20∞
36.35N
, 11°03∞
27.65W
),
351 m
, fine sand
.
F. 7.
H. laevis
Sars
:
W
, 4.2 mm (NW Mayo, Ireland). (A) Lateral view; (B) detail of epimera 1–3. Scale (A)=0.5 mm.
F. 8.
H. laevis
Sars
:
W
, 3.0 mm (NW Mayo, Ireland). (A) Lateral view; (B) detail of epimera 1–3. Scale (A)=0.5 mm.
F. 9.
H. laevis
Sars
:
W
, 3.0 mm (NW Mayo, Ireland). (A) Gnathopod 1; (B) gnathopod 2; (C) antenna 1; (D) antenna 2; (E) pereopod 3; (F) pereopod 4; (G) pereopod 5; (H) pereopod 7; (I) uropod 3; (J) telson. Scale a (I)=0.1 mm; scale b (A–H, J)= 0.1 mm.
Type
locality
Coast
of
Norway
.
Description
Female.
Size: up to
4 mm
. Described and illustrated by Sars (1895) and later by Lincoln (1979) from Norwegian specimens.
Male
(sexually dimorphic characters). Size: up to
3 mm
. Head without spine on dorsolateral margins. Antenna 1 with tuft of long, fine setae on peduncular article 3 and flagellar article 1, article 1 of flagellum elongate, flagellum with five articles, accessory flagellum with four articles. Antenna 2 with small tuft of fine short setae on peduncular article 4. Coxa 1–3 without spines, flagellum with six articles. Gnathopods 1 and 2 with an elongate, narrow propodus, gnathopod 1 with robust seta defining palm. Pereopod 7 basis with six to seven indistinct spines, each with small associated marginal seta. Urosomites narrow, urosomal segment 2 with dorsal elevation anterior to insertion of telson. Epimeron 3 posterodistal corner with excavated notch and small spine. Uropod 3 rami elongate, outer ramus article 2 longer than half length of article 1, without apical seta, inner ramus almost as long as article 1 of outer ramus, without apical seta.
Distribution
North-East Atlantic:
Norway
to north-west
Ireland
.
Discussion
This is not a commonly collected species. Females are similar to
H. crenulata
and
H. truncata
with the rounded epimeron 3 and lack of spines on coxae 1–3.
Harpinia laevis
females are distinguished by the relatively smooth, rounded basis of pereopod 7 which lack long marginal setae.
The males can be readily identified from those of
H. pectinata
and
H. antennaria
by the broadly rounded epimeron 3 (a small notch/spine is present but can be difficult to see).
Harpinia laevis
males are separated from those of
H. crenulata
by the shape of the basis of pereopod 7 and the inner ramus of uropod 3, which is almost as long as article 1 of outer ramus and has a long apical seta. The male of
H. truncata
is undescribed and while it may be similar to
H. laevis
, the characteristics of the
H. truncata
female are insufficient to hypothesize the form of the male for comparison.