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Description of Male.
Eyes present, round, black. Rostrum very small. Eyelobes rounded. Like P. excavatum except for the following details.
Antennae. First: Flagellum of about 12 segments, finely bristled distally; slightly shorter than peduncle. Peduncle, 1st segment stouter than rest, width less than ½ length; fine setae singly and in groups inferiorly and distally; 2nd, ¾ length 1st, width less than ⅓ length, fine setae on margins as in narrower 3rd segment. Second: As long as 1st; stout, especially peduncle. Flagellum of 5 segments, as long as 5th peduncle segment, fine setae on segments distally, 1st segment nearly ½ flagellum length. Peduncle 2nd segment much wider than long; 3rd wider than long, longer than 2nd, setae inferodistally; 4th slightly more than twice length 3rd, as wide as 3rd is long; 5th segment width ⅓ length, length nearly ¾ 4th; a few fine setae on margins of 4th and 5th.
Mouthparts. Only slight proportional differences in palps of 1st maxillae and mandibles from P. excavatum. Maxilliped: Narrow subrectangular inner plate reaching a little past carpus base; 3 small sharp spines alternated with 6 long setae on slightly oblique distal margin, the inner 4 setae finely plumose. Outer plate almost reaching end of carpus, distally rounded; inner margin straight, outer convex; double fringe of short setae down inner margin to end of inner plate, not with the 6 or so distinct small sharp teeth of P. excavatum. Basos has oblique row of very long finely-plumose setae across surface; ischium and merus small, single long seta on inner margin of latter. Carpus about 3 times merus length, slightly more than twice its own width; margins slightly convex; double or even treble row of medium length setae on most of inner margin; longer setae distally, especially long on outer angle; a row of 6 or 7
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Text-Fig. 7.
Paracorophium lucasi n.sp. Male. 84—Antenna 1. 85—Antenna 2. 86—Maxilla 1. 87— Mandibular palp. 88—Maxilliped, right side. 89—Gnathopod 1. 90—Gnathopod 1, palm and dactylos. 91—Peraeopod 3. 92—Peraeopod 4. 93—Peraeopod 5. 94—Epimeral plate 1. 95—Epimeral plate 2. 96—Epimeral plate 3. 97—Uropod 1. 98—Uropod 2. 99— Uropod 3 and telson.
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long setae longitudinally down middle of carpus. Propod margins convex, widening a little distally, nearly ½ carpus length and width ½ own length; medium-length setae distally around dactylos base, a nail-like spine outside and along dactylos; dactylos not ½ propod length, width ½ length, not narrowing greatly a terminal group of several short strong setae.
Gnathopods. Second: Basos, group of fine short setae on anterodistal angle, longer ones on distal ½ of posterior margin; merus width ⅖ length; carpus width slightly less than ½ length; propod like immature P. excavatum male; ovately subrectungular, width ½ length, a few fine setae along lateral and palmar margins; palm transverse, anterior ½ a slightly irregular ridge, then narrowly and quite deeply excavated to a slender but very distinct defining finger barely reaching farther distally than rest of palm; strong curved dactylos noticeably over-reaching palm, length more than ½ propod; otherwise like P. excavatum.
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Peraeopods. Third: Basos ovate, numerous fine setae on convex anterior margin; distal ½ of posterior margin more or less straight, proximal ½ strongly convex and forming distinct lobe; fringe of fairly long fine setae all along margin; greatest width a little more than ½ length. Ischium length ¾ width, less than ⅕ basos length, single seta medially on posterior margin, strong tuft of fine setae a anterodistally. Merus anterior margin convex, posterior nearly straight, both fringed with long slender setae, extremely long anterodistally. Carpus width ⅔ length, length nearly ⅓ basos; margins fringed with fine setae; oblique row of 3 or 4 strong curved spines medially on posterior surface, 3 similar spines on posterodistal angle Propod width not quite ½ length, slightly longer than merus; 4 strong single spines on anterior margin; tuft of fine setae posterodistally, dactylos nearly ⅔ propod length. Fourth: Convex anterior margin of basos fringed with short fine setae; posterior margin shallowly emarginate in middle, convex either side, anterior portion somewhat lobed; entire posterior margin fringed with single slender setae, the longest distally; greatest width about ⅗ length. Ischium slightly longer than wide, less than ¼ basos length, long setae on anterior margin. Merus width ½ length, length nearly ½ basos, a little widening distally; margins fringed with short setae, a slender spine on each distal angle. Carpus barely shorter, narrower, a few marginal setae; 2 or 3 strong curved spines medially on posterior surface, 2 on posterodistal angle, setae on margins and angles, 1 or 2 slender spines anterodistally. Propod subrectangular, as long as carpus, width ¼ length, a few setae on posterior margin, single slender spine distally, spine and tuft of long setae on angle; about 6 single (except paired 4th and 5th) spines along anterior margin, a few setae. Slender curved dactylos ⅔ propod length. Fifth: Like Pr. 4 but basos width more than ⅔ length; ischium width ⅔ length, length almost ⅓ basos, a few setae anterodistally. Merus widening a little distally, a few setae on margins, a single slender spine on anterodistal angle, 3 on posterodistal angle, 1 posteriorly near angle. Carpus width ⅖ length, as long as merus, 2 or 3 single slender spines on anterior margin. Propod about 6/7 basos length, width ⅙ length; 4 or 5 small groups of setae on anterior margin, a slender spine near distal angle; 3 groups of 2 or 3 long slender spines on posterior margin; 1 amidst strong tuft of long slender setae on angles. Dactylos about ⅖ propod length.
Epimeral Plates. First: Ovate, angles not discernible; long finely-plumose setae anteroventrally and set in a fraction from margin, similar setae on postero-ventral margin; perhaps 16–18 in all; slightly wider than deep. Second: More
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nearly subrectangular, angles broadly rounded, perhaps 15–16 long finely-plumose setae on ventral margin, 2 or 3 short setae proximally on anterior; 7 or 8 long setae on posterior. Third: Wider than 2nd, much wider than deep; subrectangular, angles rounded; 2 or 3 short setae anteroproximally, row of 5 or 6 long setae anteriorly on ventral surface, 2 short setae posteriorly.
Pleopods. Rami of about 14 segments, inner the longer.
Uropods. First: Subequal rami much shorter than peduncle; slender spine on peduncle inner distal angle; about 7 seta-tipped spines on outer dorsal margin; spatulate triangular process below and ½ along rami; 2 spines on inner ramus inner margin, 4 on end; 3 on outer ramus outer margin, 4 on end. Second: Four stout seta-tipped spines on peduncle outer dorsal margin; outer ramus has 2 spines on outer margin. Third: Peduncle subrectangular, length about ¾ width, 3 short setae on outer distal angle, 1 on inner. Outer ramus, width less than ½ length, margins slightly convex, 1 seta on outer margin medially, tuft of about 7 strong setae at end. About 3 strong setae and 1 short spine on end of inner ramus. Telson: Pair of setae on outer distal angles.