Description of Male
Length, 16 mm; depth, 3¾ mm, width, 3 mm. Colour in spirit, white. Eyes round, black, apart, ½ length of head Like T. telluris but distinguished as follows:
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Antennae. First: Length 1/34 mm, reaching past 4th peduncle segment of antennae 2, flagellum of 7 segments, segments wider than long, distal angles have groups of 2 or more short spines. Peduncle 2nd segment slightly longer than 3rd, slightly more than ½ length 1st, groups of seta-tipped spines on distal angles, 2nd and 3rd have 1 spine medially on inferior margin, 2 or more on superior. Second: Length 3¾ mm; flagellum of 20 segments; peduncle 3rd segment as long as 4th; strong seta-tipped spines distally on margins, 4th spined superiorlv also; 5th has strongly spined margins, a few spines distally.
Mouthparts. Maxilliped: Merus has several marginal spines; carpus has long spine on inner distal angle concluding row of smaller spines on inner margin, spine reaches almost to end of propod.
Gnathopods. First: Like T. telluris but more strongly spined, particularly basos margins and posterior margins of ischium and merus; dactylos reaches end of propod. Second: Sideplate deeper than wide, subrectangular. excavate posteriorly and high up, a number of fine spines on ventral surface Gills slender, terminally Y-shaped. Basos slightly concave, width ¼ length, numerous fine spines on posterior margin and surface; anterior margin and small field alongside have similar spines Ischium subsquare, slightly narrower than basos. posterior margin and distal angle have fine spines, anterior margins form cup distally to receive propod. Merus as long, slightly narrower, short spines on posterior margin, a few very fine spines on surface; posterodistal angle rounded but sharp; anterior margin contiguous with small cup-shaped carpus on to which expanded ovate propod fits Propod slightly longer than basos, width about ¾ length; anterior margin convex, posterior not ½ length anterior, a few minute spines where dactylos impinges; produced distally in large projecting angle which defines palm, a small tooth on inner surface forming fork between which dactylos fits. Outer projection extends slightly past dactylos inner margin but dactylos tip extends over posterior propod margin. A further long narrow marginally-spined tooth extends distally about ⅔ along palm from posterior margin; between it and fork the palm is raised in shallow convexity with both margins spined. Dactylos long, curved, slightly thickened near innermost tooth of palm.
Peraeopods. First: Sideplate subrectangular, deeper than wide, excavate posteriorly and high up. Basos width ⅓ length, many small marginal spines. Ischium has about 3 spines posteriorly; merus has a few on convex posterior margin, anterior has a field of numerous spines. Carpus narrower, ¾ merus length, similarly spined, a few of the anterior spines very long. Propod as long, narrower, strongly spined. Dactylos tapering, more than ½ propod length Second. Sideplate deeper than wide, trapezoid; segments shorter and broader than in Pr. 1; dactylos has spur on inner margin. Third: Sideplate anterior lobe spined ventrally, posterior lobe ventrally and posteriorly Basos ovate, as wide as long, numerous stout spines on margins. Ischium wider than deep, subrectangular, anterior margin and distal angle spined; merus nearly as wide distally as long, posterior margin convex; margins have numerous stout long spines; the largest more than ½ carpus length. Carpus similarly spined, spines on anterior margin especially strong. Propod as long, not ½ carpus width, strongly spined. Dactylos ½ propod length, relatively straight. Fourth: Basos has single spines on posterior margin, groups on anterior, some on surface, ischium anterior margin has a few spines, other segments longer and narrower than in Pr. 3 but similarly spined. Fifth: Basos wider than long, widest ventrally where posterior margin forms broadly rounded downward projection past ischium.
Text-fig. 10.—Talorchestia chathamensts n.sp. 119—Gnathopod 2, mmature male, various stages. 120—Peraeopod 3. 121—Peraeopod 4. 122—Peraeopod 5, male. 123—Peraeopod 5, female. 124—Peraeopod 5, immature male, carpus, growth stages. 125–126—Pleopod 1 and 3. 127—Epimeral plates 1–3. 128—Uropod 1. 129—Uropod 2. 130—Uropod 3. 131—Telson.
posterior margin crenulate, has single spines. Ischium subrectangular, anterior margin and distal angle spined. Merus subrectangular, thick, length about ¾ basos, anterodistal angle produced downwards a little as blunt projection. Carpus as long as basos is wide; anterior margin and surface have many small spines; posterior margin expanded to large hemispherical plate, width almost twice length of carpus; posterior margin of cup spined all around, largest spines on dorsal rim; many small spines on ventral surface. Propod and dactylus long, narrow, as in Pr. 4.
Epimeral Plates. First: Anterior margin rounds to ventral, has about 5 marginal spines; posterior margin straight, has spine on distal angle, about 3 short marginal setae. Second and Third: Deeper than wide, a few spines on anterior surface, posterior angle sharp, posterior margin straight, has 4 or 5 setae, 1 or 2 distal spines.
Pleopods. Biramous, peduncle longer than rami, rami unsegmented, with plumose setae. First pleopod, peduncle outer margin concave, with long spines, shorter spines on proximal surface, inner margin has 3 spines proximally, 2 distally. Second has fewer surface spines, none on inner margin; outer margin as before. Third has outer margin spines more numerous, hardly any on surface or on inner margin.
Uropods. First: Peduncle longer than rami; numerous spines on ventral and both dorsal margins; outer ramus has about 7 strong spines dorsally, 4 on end, about 3 medially on ventral margin; inner ramus has 2 rows of several spines, 3 long and 1 short spine at end. Second: Peduncle, both dorsal margins have strong spines; ventral margin about 4 fine spines; inner ramus has 2 dorsal rows of spines; outer has 1 row. Third: Peduncle narrowing a little posteriorly, about 7 spines on dorsal and distal margins, numerous small spines on surface; ventral margin is strongly setose. Ramus long and narrow, distal ½ of dorsal and end margins stronglv spined. Telson: Subtriangular to ovate, distally emarginate, spined marginally, 2 small plumose setae medially on margin, these last normally difficult to see.