Acanthocopinae (Crustacea: Isopoda: Munnopsididae) from the Southern Ocean deep sea with the description of Acanthocope eleganta sp. nov.
Author
Malyutina, Marina
Author
Brandt, Angelika
text
Zootaxa
2004
550
1
20
journal article
10.5281/zenodo.157199
046a4001-e8f6-42d5-ba60-278baa66eba7
11755326
157199
CB3CB22A-685B-4FBE-963D-413F86933923
Acanthocope
Beddard, 1885
Acanthocope
Beddard, 1885
: 922
; 1886: 78; Menzies, 1956: 2; 1962: 152;
Wolff, 1962
: 110
;
Chardy, 1972
: 386
;
Malyutina, 1998
: 343
–346; 1999: 288–289.
Type
species:
Acanthocope spinicauda
Beddard, 1885
.
Diagnosis:
Head without dorsal spines, interantennular distance more than half as wide as head, frontal margin sloping, nearly straight from above. Lateral margins of pereonites 1–4 rounded; natasome completely fused, pereonites 5–7 with lateral spines; pleotelson with 2 pairs of lateral spines and 1 terminal spine. Antenna 1 article 1 without spines, flagellum short, with 3–4 articles in females and long, multiarticulated in males; antenna 2 articles 1 and 2 fused without suture; article 2 with distomedial spine, article 3 without squama, with distomedial and distolateral spines; mandibular palp absent or with 1 or 2 articles, if of 3 articles, thin, with last article elongate and straight; maxillipedal palp article 2 largest, with expanded lateral margin, article 3 narrower, triangular. Pereopods 1–4 similar, slender; coxa of pereopod 1 short and rounded, coxae of pereopods 2–4 elongate, projected into anterior spines; pereopods 5–7 with rather narrow crescentshaped carpi and elongate oval propodi, smaller than carpi; dactyli without dorsal unguis, with 2–3 long distodorsal setae. Male pleopods 1 and 2 forming domelike operculum; pleopods 1 half or less as long as pleopods 2, covering basal gap between pleopods 2, like a deeplykeeled boat; pleopods 2 with ventral projection near midlength of protopod, endopod and exopod inserting at basal part of protopod. Uropods cylindrical, elongate, uniramous or with tiny exopod.
FIGURE 1.
Distribution map, schematic illustration of localities of the species of
Acanthocope
: 1 –
A. acutispinosa
Beddard, 1885
; 2 –
A. annulatus
Menzies 1962
; 3 –
A. argentinae
Menzies 1962
; 4 –
A. armata
Chardy, 1972
; 5 –
A. beddardi
Malyutina, 1999
; 6 –
A. carinata
Chardy, 1972
; 7 –
A. curticauda
Birstein, 1970
; 8 –
A. eleganta
sp. nov.
; 9 –
A. galatheae
Wolff, 1962
; 10 –
A. mendeleevi
Malyutina, 1998
; 11 –
A. muelleri
Malyutina, 1999
; 12 –
A. orbis
Menzies & George, 1972
; 13 –
A. pentacornis
Müller, 1985
; 14 –
A. spinicauda
Beddard, 1885
; 15 –
A. spinosissima
Menzies, 1956
; 16 –
A. unicornis
Menzies, 1962
.
Distribution
: Most species of
Acanthocope
are known only from the
type
locality and from a single specimen. Only three species are known from the Northern Hemisphere: two from the north Atlantic (54–56 N,
2456–3465 m
) and one from the northwest Pacific (44 N,
4690–4720 m
). All other species were found from tropical latitudes to the Southern Ocean: western Atlantic (17 N,
1224 m
), 1 species; eastern Pacific (5 N–42 S,
2650– 3670 m
), 3 species; southwest Pacific (29 S,
3400 m
), 1 species; northwest Indian Ocean (13 N,
1830 m
), 1 species; southeast Indian Ocean (50 S,
3290 m
), 1 species; and south Atlantic (16 S–65 S,
3760–5585 m
), 7 species. Only
A. galatheae
Wolff, 1962
is widely distributed, known from the Gulf of
Panama
of the east Pacific (
5 49’ N
78 52’W
,
3270– 3670 m
) and the south Atlantic (
16 13.3’S
0
5 26.8’E
–
31 24.8’S
0
1 50’W
,
4725–5585 m
). The new record of the species from the
Antarctic
abyssal (64–66 S, 39–43°W,
4647–4778 m
) lies between these two localities. A new locality is recorded for
A. annulatus
Menzies, 1962
which was described from
4885 m
southwest of Cape Town (
36°34’S
14°08’E
), the new specimens were found near the
Antarctic
Peninsula (
59°40’S
,
57°35’W
,
3689 m
). For locations of all species of
Acanthocope
see distribution map (
Fig. 1
).