Paraliparis camilarus, Stein, 2012

Stein, David L., 2012, Snailfishes (Family Liparidae) of the Ross Sea, Antarctica, and Closely Adjacent Waters 3285, Zootaxa 3285, pp. 1-120 : 40-48

Paraliparis camilarus n. sp.

Figs. 27, 28, 29

Holotype. NMNZ P.043687, male, 282 mm TL, 260 mm SL, 71°55.80' S, 173°18.08' E, NW edge of Mawson Bank, R / V Tangaroa, Stn. IPY / CAML TAN 0802 /144, 23 February 2008, 1431– 1658 m. NMNZ P.043687/1, cleared and stained right pectoral girdle.

Diagnosis. V 68, D 61, C 7, P 21, radials 4 (3+1), R1, R2, R3, R4 notched; pc 5. Teeth simple, mostly uniserial except irregular near symphysis. Mandibular symphyseal pores well separated. Gill opening short, completely above pectoral base, not reaching uppermost pectoral fin ray. Gill flap absent. Pectoral notch rays rudimentary. Head 17% SL, interorbital wide, about 50% HL, LLD 13% HL. Gill cavity blackish, peritoneum black, stomach probably solid black.

Description. Counts. V 68 (13+55), D 61, A 53, C 7 (1+3/3), P 21 (15+2+4), radials 4 (3+1), pc 5. Ratios. HL 16.6, HW 11.8, sn 5.6, E 3.7, orbit 4.5, io ~8.3, uj 5.2, go 1.7, preD 27.9, preA 45.1, aAf 29.8, UPL 10.6, LPL 13.1, pcl 9.1. In % HL: HW 71.3, sn 33.8, orbit 27.3, io 49.8, uj 31.5, go 10.2, preD 167.8, preA 271.5, aAf 179.6, UPL 63.6, LPL 78.9, LLD 13.2, pcl 54.6, cp 5.2.

of Photograph

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SL

mm

138

, 043481

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P

NMNZ

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b

;

NIWA

, McMillan

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P

by specimen fresh of Photograph

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SL

mm

148

, 043389

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P

NMNZ

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a

; antarcticus, NIWA Paraliparis . Marriott by P

25

. specimen FIGURE fresh

Head low, snout blunt; dorsal profile of head almost flat, rising slowly from snout to above abdominal cavity. Mouth subterminal or inferior, upper jaw reaching to below mideye, oral cleft short, barely reaching to below anterior margin of orbit. Premaxillary teeth uniserial for about 18 posterior teeth, irregularly biserial for another 10 anterior teeth. Posterior teeth larger, stouter, not as sharp as those anterior. Symphyseal gap present, with deep anterior notch. Mandibular teeth much smaller than premaxillary teeth, uniserial for posterior 50–60 teeth, an irregular band of tiny teeth near symphysis. Posterior teeth extend well behind posterior end of premaxillary tooth row. Chin pores small, paired, well separated. Gill opening above pectoral fin upper ray, extending ventrally to just above opercle tip. Opercle not supporting edge of gill opening, visible as a ventrally curved spine, its tip horizontal. Gill flap absent, margin of opening fleshy, slightly concave.

Pectoral fins short, upper ray about on horizontal with lower margin of orbit; upper lobe rounded, notch deep, lower lobe rays bound together by skin for about 2/3 their length. Right pectoral girdle with 21 (15+2+4) rays, notch rays rudimentary, strongly reduced, one present as base only; lower lobe of four rays, the dorsalmost a bit more widely separated from lower three than they are to each other, lowest rudimentary, short, fine. Radials 4 (3+1); R1, R2, R4 round, large, R3 somewhat smaller, located at edge of girdle but not D-shaped. R1, R2, R4 notched, R3 probably abnormal, with teardrop-shaped hole extending to edge, possibly an incompletely developed notch. Notch of R4 possibly abnormal. Fenestrae present, in abnormal positions between and anterior to R1-R2, R2-R3. Scapula with broad basal plate, helve narrow; coracoid with long, slender helve, basal notch present.

Body relatively slender but still deeper than head, deepest over mid-abdomen. Dorsal fin insertion between vertebrae 8–9, anal fin insertion between vertebrae 13–14. Dorsal and anal fins distinctly deeper posteriorly, dorsal fin rays not visible until approximately mid-length. Anus about between bases of lowest pectoral fin lobe rays, below and distinctly anterior to vertical through gill opening. A small genital papilla present. Peritoneum clearly visible through body wall. Body cavity short, deep, extending dorsally to about level of upper margin of orbits. Hypural complex fused, slit absent. Caudal fin of seven (1+3/3) rays. Pyloric caeca five, long, slender and thickwalled, of different lengths, the shortest about half the longest. Skin tough, rugose, thin, but not easily damaged, attached to body. SECM apparently minimal.

.

1

/

043687

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P

NMNZ

,

girdle pectoral

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b

;

view lateral

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a

;

SL

mm

260

,

043687

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P

NMNZ

,

Holotype

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sp

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n

camilarus

Paraliparis

.

27

FIGURE

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NIWA

,

McMillan

.

P

by specimen fresh of

Photograph

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SL

mm

260

,

043687

.

P

NMNZ

,

Holotype

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sp

.

n

camilarus

Paraliparis

.

28

FIGURE

Fresh color dusky rose, darker dorsally and posteriorly; snout, head, and pectoral fins darker, tail rosy (Fig. 28). Body in alcohol translucent brown, darker ventrally, on snout, pectoral fin edges, and belly; black peritoneum visible through body wall. Pectoral fin lower lobe filamentous rays blackish. Mouth dusky, branchial cavity blackish, surface of stomach damaged but stomach apparently all black, pyloric caeca also possibly black but now pale except for black remnants.

Distribution. The holotype was captured to the northwest of Mawson bank at 1431–1658 m.

Etymology. The new species is named in honor of the Commission for the Conservation of Antarctic Living Resources, CCAMLR, under whose auspices this species was collected. Thus the specific epithet camilarus .

Comparisons. Although very similar to P. stehmanni (NMNZ P.043719 and those previously described) (especially in predorsal, preanal fin, and anus to anal fin lengths), P. camilarus differs in some regards from them all ( Table 2, Table 3). In particular, head length is slightly less (16.6 vs 17–21 SL) and the gill opening is shorter (2 vs ~3% SL). The right (possibly abnormal) pectoral girdle differs in having radials R1, R2, and R3 not as deeply notched, having R4 notched (vs unnotched) and a basal coracoid notch (vs absent). An oval fenestra is present anterior to space R2-R3 (vs between the radials). In addition, the number of premaxillary teeth differs, and P. camilarus has irregularly biserial teeth anteriorly for 10 (vs 20) teeth. It lacks a gill flap (vs present, small and rounded) and has the opercle at the ventral end of the gill opening (vs in the middle, supporting a small lobe). Its caudal fin is of 1+3/3 rays (vs 3/4 clear principal rays). The peritoneum is clearly visible through the body wall (vs visible but whitish-black) and its stomach is apparently all black (vs pale). Finally, its skin texture is different (thin, rugose vs thin and smooth).

acters in bold type. Asterisk: probable abnormalities.

.

c

;

43578

ZIN

,

girdle pectoral

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b

;

view lateral

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a

;

23

.

Fig

:

1986

, Andriashev

From

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SL

mm

170

,

43577

ZIN

,

Holotype

.

1980 Andriashev devriesi Paraliparis

.

30.

FIGURE pores chin

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NMNZ

,

McPhee

.

R

by specimen fresh of

Photograph

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SL

mm

178

,

038577

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P

NMNZ

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Andriashev devriesi

Paraliparis

.

31

FIGURE