Remarkable Australasian marine diversity: 18 new species in Pentaceration Just, 2009 (Crustacea, Isopoda, Paramunnidae)
Author
Just, Jean
text
Zootaxa
2011
2813
1
54
journal article
47602
10.5281/zenodo.203856
60e82aa4-3a36-4f25-82a2-23acef2974c2
1175-5326
203856
Pentaceration kermadecia
sp. nov.
Figures 12–13
Type
fixation.
Holotype
, female, here designated.
Etymology.
The species is named for the
type
locality, the Kermadec Trench.
FIGURE 13.
Pentaceration kermadecia
sp. nov
.
Holotype, Ƥ.
ll
, lower lip;
md l
, left mandible;
mx1–2
, maxilla 1 and 2;
mxp
, maxilliped;
pl 3–5
, pleopods 3–5.
Material examined.
Holotype
,
Ƥ,
2.9 mm
, Kermadec Trench,
36º07'S
,
175º52'W
, 5340–
5230 m
,
23 February 1952
,
Galathea
Expedition 1950
–1952, stn 661,
ZMUC
CRU-
20443 (with 2 slides).
Description
(adult female,
holotype
)
.
Body
elongate, slightly tapering towards pleon; width 0.28 length, widest between pereonites 2 and 3.
Head
length 0.30 width; length posterior to eyestalks 0.7 anterior length.
Frontal margin
mid-spine 50º triangle, length equals mid length of pereonite 2, lateral spines similar to, but slightly longer than mid-spine, diverging at 115°, all 3 spines with denticulate margins.
Eyestalks
overreaching pereonite 1 with approximately half their length, pointing directly laterad, anterior and posterior margins parallel, apex distally denticulate with small terminal spine.
Pereonites
1–4 with single broad, bluntly pointed middorsal spine, pereonites 5–6 with single smaller round mid-dorsal spine. Pereonite 1 lateral margins rounded with denticulate margins; pereonite 2 and 3 lateral spines diverging at 35°; pereonites 2 and 3 and 5–7 lateral spines triangular with broad base, acutely pointed, with denticulate margins, 6 and 7 with rounded projection on mid-anterior margin; pereonite 4 lateral spines approximately 1/ 4 length of adjacent pereonite spines; pereonites 5 and 6 with fringe of simple setae posterolaterally where overlapping succeeding pereonite.
Pleon
length 1.25 width.
Pleonite 1
width 0.72 distance between uropods, length 0.15 width.
Pleotelson
with short proximal neck; proximal and lateral margins forming evenly merging curve, lateral margins evenly convex, with 11 to 12 denticles; distal projection triangular at 85°, 0.24 length of entire pleotelson, apex broadly rounded.
Antennula
articles 1 and 2 of equal length (
Fig. 12
habitus; these articles foreshortened in
Fig. 12
au), 1 slightly wider than 2, tubular, 1 and 2 combined reaching to about apex of eyestalk; articles 3, 5 and 6 of subequal length, all approximately 1/3 longer than 4.
Antenna
(both antennae broken after peduncle article 4). Article 2 as wide as long, round, approximately twice length of 1; article 3 length 3.4 width, cylindrical.
Pereopod I
basis length 4.7 width; ischium 0.8 length of basis, mid-anterior margin with single short spine; carpus narrowly oval, robust setae on posterior margin with small translucent flanges either side and in middle; propodus narrowing distally to insertion of dactylus, with 2 robust setae on opposing margin and small translucent flanges either side of and in the middle between robust setae. Pereopod II slender; propodus with 3 slender robust setae on posterior margin.
Pleopod II
(operculum) ovoid with slightly concave distal margins, width 0.74 length.
Uropods
recessed into low protruding cuticle tubes with denticulate rim; protopod hidden; exopod vestigial, hidden, with 2 setae protruding; endopod length 1.8 width.
Size.
Largest female,
2.9 mm
.
Distribution.
South-western Pacific, Kermadec Trench, 5340-5230 meters.