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Some Amphipoda, Isopoda and Tanaidacea from Cook Strait

Family Aegidae

Family Aegidae

Rocinela garricki n.sp. (Figs. 39–49).

Diagnosis: Frontal margin of head triangular, subacute; frontal lamina longer than wide. Peraeopod 1, 3rd segment lacks spines; 5th has 3 strong spines, 6th has 9 closely-set spinet on posterior margin. Last 4 peraeopods notably different from 1st 3.

Body: Cephalon wider than long, overhanging bases of antennae. Eyes large, oval, well-separated, ocelli separated. Thorax, 1st 3 segments subequal in length, 4th longer, 6th and especially 7th much shorter, the last almost completely hiding 1st abdominal segment. Remaining 4 abdominal segments subequal, lateral margins of 4th covering those of 5th. Coxal plates distinct in dorsal view, the last reaching well back past 1st abdominal segment. Telson distally rounded, finely scaled and minutely setose, margin strongly fringed with plumose setae, about 9 spines around distal margin.

Antennae. First: Does not quite reach end of peduncle of 2nd; flagellum of 6 small segments, the last 5 with 2 flaccid sensory setae distally on each; peduncle of 3 segments, 3rd the largest Second: Reaches end of 2nd thoracic segment, peduncle 1st segment longer than 2nd, almost as long as 3rd, 4th barely shorter and about ¾ length 5th; flagellum of about 11 segments.

Mouthparts. Mandible: Small tubercular molar process; palp of 3 segments, 1st naked, barely shorter than 2nd which has about 9 plumose setae marginally, 6 setae on surface; 3rd about ½ length 2nd, about 9 setae on concave margin, 2 small end spines. Surface, of 2nd segment especially, comb-scaled. Maxilliped: Palp 2nd segment has 3 end spines, one on surface.

Peraeopods. First: Second segment, length more than twice width, a few marginal setae; 3rd narrower, ½ as long, 3 long setae anterodistally; 4th about 2/3 as long, subtriangular, 5–6 setae anterodistally, 1 spine proximally on posterior margin, 2 distally; 5th very short, partially concealed; 6th as long as 4th, as wide as long, a few setae anterodistally; posterior margin produced in blade-like expansion with 9 strong spines, a few fine setae behind spines; 7th long, curved, slender, more than twice length 6th. Second: 6th segment has 8 spines. Third: 6th segment has 7 spines. Seventh: Long, relatively slender; 2nd segment especially long, has a few marginal setae; 3rd a little shorter, narrower, widens a little distally, 3 spines anteriorly, strong spine-groups on distal angles; 4th about 2/5 length 3rd, pair of spines ½ along anterior surface, groups on distal angles, 5th a little longer, similar; 6th a little shorter than 5th, 4 spines anteriorly; dactylos short and curved.

Second Pleopod. Blunt slender male stylet reaches ½ down endopod; rami subequal, fringed with setae, exopod has longitudinal row of clear circular patches which are probably glandular down surface, is distally notched.

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Astacilla levis Thomson & Anderton. Male.

Astacilla levis Thomson & Anderton. Male.

Fig. 50.—Adult male. Fig. 51.—Head and 1st thoracic segment, side view. Fig. 52.—Head and 1st thoracic segment, dorsal view. Fig. 53.—Pleotelson, dorsal view. Fig. 54.—Antenna 1. Fig. 55.—Maxilliped. Fig. 56.—Peraeopod 1. Fig. 57.—Peraeopod 2. Fig. 58.—Peraeopod 2, dactylos. Fig. 59.—Peraeopod 5. Fig. 60.—Peraeopod 5, dactylos. Fig. 61.—Uropod.

Astacilla levis Thomson & Anderton. Male.

Astacilla levis Thomson & Anderton. Male.

Fig. 62.—Antenna 2. Fig. 63.—Antenna 2, detail of scales and setae. Fig. 64.—Antenna 2, flagellum. Fig. 65.—Antenna 2, flagellum, detail of margin. Fig. 66.—Pleopod 2 and male stylet.

Jaeropsis palliseri n.sp. Male.

Fig. 67.—Antenna 1. Fig. 68.—Antenna 2. Fig. 69.—Maxilliped. Fig. 70.—Maxilliped, endite detail. Fig. 71.—Maxilla 2. Fig. 72.—Pleopod 1. Fig. 73.—Uropod.

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Uropod. Rami ovate, endopod slightly the longer, the more rounded distally; margins strongly setose; 7 spines on outer margin of exopod, about 3 distally on outer margin of endopod. Peduncle inner process reaches ½ down endopod.

Material Examined: Station BOL (VUZ. 43), 1 male, 155 mm.

Types : Slides Oc. 5.

Distribution: Cook Strait.

Discussion: In general, this species is very close to R. orientalis (cf. Hale, 1925; Stebbing, 1905). It is distinguished from this and all other species of the genus by the 9 spines on segment 6 of peraeopod 1. R. latis (Southwell, 1915) has 8 spines but is stated to have "the four gressorial legs ... very similar to the 1st 3 pairs of legs but a little more slender". The species is named for Mr. J. A. Garrick who has been responsible for much of the collecting.