Comprehensive Description

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Description

Cyphocaris faurei n. sp.

 

Head half length of 1st peraeon segment ; eyes pear-shaped, widest below. First segment of peraeon equal to 2nd and 3rd together, slightly swollen in front, but not projecting overhead. Side-plate 1 semi-circular, 2 triangular, deeper than long, anterior margin distally slightly emarginate, 3 subrectangular, as deep as long, 4 obovate, anterior and inferior margins strongly convex, posterior margin con­cave on either side of a small projecting tooth situate a little below the middle, 5 subrectangular, longer than deep, similar to that figured by Chevreux for ♂ of C. alicei, but the groove along the inferior margin less distinct, 6 subrectangular, as deep as long, 7 semicircular.

 

Pleon segment 4 concave at base, segments 1 and 2 with a low oblique keel running out to the subacute postero-inferior angles, postero-inferior angle of segment 3 a little produced, acute.

 

Telson equal in length to 4th, 5th and half 6th pleon segments together, long, narrow, tapering, cleft for ¾ its length, apices entire, both margins and apices without spinules.

 

First antenna 12 mm. long, flagellum ca. 32-jointed, 1st joint strongly setose on inner and lower surfaces, each of the other joints with a few setules and one calceolus, accessory flagellum 7-jointed, 1st and 7th joints elongate.

 

Second antenna ca. 32 mm. long, 4th joint strongly convex on posterior margin (as in C. alicei Chevreux), 4th and 5th joints with tufts of setae on anterior margin, flagellum ca. 180-jointed.

 

Epistome shorter than broad, proximally not so produced as in C. challengeri Stebbing, not projecting in front of upper lip.

 

Lower lips as in C. challengeri, with thick fringe of setae on outer and inner margins of the lobes.

 

Mandibles similar to those of C. anonyx Boeck, molar distinct, denticulate, palp nearly twice length of trunk, 1st joint as broad as long, 2nd joint equal to trunk, its greatest width nearly equal to half its length, outer margin slightly concave proximally, distally straight, inner margin strongly angled, 3rd joint half length of 2nd, elongate ovate, apically acute, inner distal margin of 2nd and whole of inner margin of 3rd with fringe of long setae, those at apex of 3rd joint pectinate.

 

First maxilla, inner plate with ca. 12 plumose spine-setae, diminish­ing and passing gradually into ordinary setae near base, outer plate with 11 spines, the inner ones denticulate, palp with 1st joint broader than long, 2nd joint widest distally, distal margin subtruncate, with ca. 16 stout spine-teeth, increasing in size from inner to outer margin, and a number of setae.

 

Second maxilla as in C. challengeri, but more strongly setose.

 

Maxilliped, inner plate with 3 stout spine-teeth and several setae on apex and 1 more elongate spine-tooth just below apex, outer plate with ca. 20 close-set spine-teeth, rather more elongate than in C. challengeri or C. anonyx, at least twice as long as broad, palp strongly setose.

 

First gnathopod, 2nd joint equal to the 5 following joints, 5th and 6th subequal in length, but 5th rather broader, 7th but not 6th serrate on hind margin.

 

Second gnathopod, 2nd joint curved, twice as long as 3rd, 3rd and 5th subequal, 4th and 6th subequal and shorter than 3rd or 5th, inner margin of 6th not serrate, 7th not equal to width of 6th, curved, inner Margin not serrate, setae on 5th and 6th joints not clavate.

 

First peraeopod not quite as long as 2nd gnathopod, 4th and 5th joints subequal, 6th a little longer, with 5 groups of spines on inner and 4 on outer margin, 7th half length of 6th.

 

Second peraeopod, 5th and 6th joints subequal, 4th a little longer, 7th 2/3 6th.

 

Third peraeopod, 2nd joint produced backwards in a long curved spiniform process reaching to end of 5th joint, hind margin quite entire, 4th joint equal to 5th, 6th a little longer, inner margin of 6th with 6 groups of spines, outer margin with 2 groups.

 

Fourth peraeopod, 2nd joint twice as long as broad, ovate, posterior margin produced a little beyond insertion of 3rd joint, apex acute, posterior margin evenly convex, with 5 quite small teeth, 4th, 5th and 6th joints increasing slightly in length, 5th with 3, 6th with 6 groups of spines on anterior margin, 7th half length of 6th.

 

Fifth peraeopod, 2nd joint as in 4th peraeopod, but a trifle larger and broader, posterior margin with 7 small teeth, 4th, 5th and 6th subequal, 5th with 4, 6th with 7 groups of spines on anterior margin, 7th half length of 6th.

 

First and second uropods, rami narrow lanceolate, subequal, a little shorter than peduncle, which is setose on inner margin, 2 spines on inner margin of inner ramus near base, rest of inner margin of both rami with small closely-set spinules.

 

Third uropod, outer ramus twice as long as peduncle and reaching telsonic apex, inner ramus a little shorter, both rami ovate lanceolate, inner margins fringed with long plumose setae, 2nd. joint of outer ramus with a small spinule on either side of its base.

 

Length : 30 mm. ; depth from back to inferior margin of 5th side-plate : 6 mm.

 

Colour : In spirit, yellowish.

 

Locality : Cape Point N. 700 E., distant 40 miles. 800 fathoms. 1 a . East London NW. ½ N., distant 18 miles. 250-300 fathoms. 1 J s.s. " Pieter Faure." 22/7/03 and 15/4/01. (S.A.M., Nos. Al20 and A2768.)

 

The distinguishing characters of this species are to be found in the 1st peraeon segment, the 4th side-plate, the 2nd joints of 3rd to 5th peraeopods, the telsonic apex, the palp of 1st maxilla, the outer plate of the maxilliped, and the details of the spines and setae on the various appendages.

 

Named after the Cape Government trawler s,s. " Pieter Faure."”

 

 

(Barnard, 1916: 117-120)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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