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
10.5281/zenodo.203856
60e82aa4-3a36-4f25-82a2-23acef2974c2
1175-5326
203856
Pentaceration lancifera
sp. nov.
Figures 6–7
Type
fixation.
Holotype
, male, here designated.
Etymology.
The epithet is composed of the Latin
lancea
= lance and
fero
= carry, thus The Lance Carrier, alluding to its long slender posterior pleotelson projection.
Material examined.
Holotype
,
3, 3.0 mm,
Australia
, Victoria, South of Point Hicks,
38o25.00'S
,
149o0.00'E
,
1500 m
, compacted clay,
WHOI
epibenthic sled, G.C.B. Poore et al, RV
Franklin
, stn SL 27,
22 July 1986
,
NMV
J20065
(
with 3 slides
)
.
Paratypes
(
20 specimens
). Same data as
holotype
,
NMV
J20066
(9 Ƥ, 5 3).
Australia
, Victoria, South of Point Hicks,
38o21.90'S
,
149o20.00'E
,
1000 m
,
WHOI
epibenthic sled, G.C.B. Poore
et al.
, RV
Franklin
,
23 July 1986
, stn SL 32,
NMV
J20067
(2 Ƥ, 1 3).
Australia
, Victoria, South of Point Hicks,
38o16.40'S
,
149o27.60'E
,
800 m
, coarse shell, biogenic sediments,
WHOI
epibenthic sled, M.F. Gomon
et al.
, RV
Franklin
,
23 July 1986
, stn SL 34,
NMV
J20068
(1 Ƥ, 2 3).
Description
(male,
holotype
).
Body
, elongate with nearly parallel pereon sides; width 0.25 length, widest between pereonites 2 and 3.
Head
length 0.25 width, length posterior to eyestalks 2.0 anterior length.
Frontal margin
mid-spine length twice head length, slender pointed, proximal half with scattered small denticles; lateral spines slightly longer than mid-spine, otherwise similar, diverging at 105°.
Eyestalks
barely overreaching lateral spines on pereonite 1, pointing directly laterad, tapering to acute point, anterior margins finely denticulate.
Pereonites
1–7 with single middorsal long vertical to slightly backward leaning spine, all of subequal length. Pereonite 1 lateral margins convex with slender, acute spine as long as pereonite mid-length, pointing forward at 45º; pereonites 2–3 lateral spines slender acute, diverging at 40°, approximately as long as 0.85 pereonite width, with marginal small denticles; pereonite 2 spines pointing directly laterad, 3 pointing backward at approximately 45º; pereonite 4 lateral spines approximately as long as those of pereonite 1, but pointing directly laterad; pereonites 5–7 with lateral spines of similar shape but different sizes, spines on 6 similar to pereonite 2 spine, spines on pereonite 5 half length, those of 7 2/3 length of pereonite 6 spines, pereonite 5 spines pointing directly laterad, of 6 backwards at 50º relative to body mid-line, of 7 backwards at approximately 30º.
Pleon
length 2.2 width.
Pleonite 1
width 0.85 distance between uropods, length 0.23 width.
Pleotelson
without proximal neck; proximal and lateral margins merging evenly, lateral margins evenly convex, with 11 denticles; distal projection drawn out to long, pointed spine. approximately 0.6 length of entire pleotelson.
Antennula
articles 1 and 2 combined reaching to apex of eyestalks; article 1 shorter and slightly wider than 2, tubular; 3 and 4 of equal length, combined approximately as long as 5 (3 and 4 somewhat foreshortened in
Fig. 7
, au); 5 length 1.5 of 6.
Antenna
article
2 in
ventral view 2.75 length of 1, with single distolateral denticle; 3 width 0.2 length, with 1 lateral denticle on proximal bulge and 1 distally; 5 length 4.2 times 4; 6 length 1.6 of 5; flagellum with 9 articles, proximal article length 1.4 article 2.
FIGURE 6.
Pentaceration lancifera
sp. nov.
Holotype, 3.
p1
, pereopod 1;
pl1–2
, pleopods 1 and 2;
pt v
, pleotelson ventral view;
up
, uropod. Habitus scale: 0.5 mm.
FIGURE 7
.
Pentaceration lancifera
sp. nov.
Holotype, 3, except op, paratype, Ƥ.
a
, antenna;
au
,
antennula
;
cv
, head ventral view;
md
, mandible;
op
, operculum (pleopod 2);
p2 and 6
, pereopods 2 and 6.
Pereopod I
basis length 4.8 times width, anterodistal margin with long row of small acutely pointed spines; ischium length 0.63 length of basis, length 4 times width; carpus narrowly oval, posterior margin with small translucent flanges at base of robust setae; propodus narrowing distally to insertion of dactylus, with 2 robust setae on opposing margin. Pereopods II–VII slender, basis of 2 and 3 with row of small spines similar to pereopod I; propodus pereopods II and III with 2 slender robust setae on posterior margin, of pereopod VI with 4 robust setae.
Pleopod I
distal lateral sublobe prominent, broadly rounded, overlapping smaller, triangular proximal lobe; width 0.23 distance to midline; distal projection length 0.38 pleopod total length, forming acute angle, with bluntly pointed apices.
Pleopod II
protopod rounded distally, lateral margin with simple setae; endopod article 2 (stylet) forming approximately 125° curve.
Uropods
recessed into simple cuticle fold; protopod and exopod apparently absent; endopod length 3 times width.
Female
. Females have slightly less strongly developed pereonite 1 lateral parts, but are otherwise similar to males. The operculum is ovoid, pointed with nearly straight distal margins, width 0.68 length.
Size.
Largest male, 3.0 mm; largest ovigerous female,
3.45 mm
.
Distribution.
Australia
, eastern Bass Strait slope,
800–1500 m
.