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Some Amphipoda, Isopoda and Tanaidacea from Cook Strait

S.O. Flabellifera

S.O. Flabellifera

Family Eurydicidae

Cirolana quadripustulata n.sp. (Figs. 25–38).

Diagnosis: Very large, 40–60 mm. Frontal lamina long, thin; maxilla 1 has 4 spines on inner plate; antenna 1 almost reaches 1st thoracic segment; antenna 2 reaches 5th. Eyes long, subrectangular. Peraeopod 7, 2nd segment broad, setose; abdominal segment 3 strongly produced laterally to cover 4th and 5th and reaching base of uropod. Male, thoracic segments 3 and 4 have each 2 small tubercles dorsally, those on 3rd segment prominent, those on 4th less distinct. Penial processes are indistinct tubercles; appendix masculina long, slender, barely curved at tip.

Body: Head width more than twice length, anterior margin somewhat concave. Eyes of 10–11 rows of ocelli from 2nd antenna peduncle back to posterior margin of head, cover most of side of head which is separated from dorsal surface by slight ridge. Body segments of more or less equal width, 1st and 4th longest; coxal plates distinct, ventrally setose, last 4 with slightly produced acute posterodistal angles, 7th reaches back to partly cover lateral surface of 2nd abdominal segment. 3rd and 4th abdominal segments laterally produced back to base of uropod. Telson distally rounded, setose, has 7 spines along distal margin.

Antennae. First: Short, as long as eye and lying along it; flagellum of 38–40 short wide segments, each has row of long flaccid sensory setae, forming tract along entire flagellum. Peduncle 1st segment not quite twice length 2nd; 2nd about ¾ 3rd; each has 1–2 plumose setae on margins, an especially long one on inner distal angle of 3rd; 3rd has bristled flange lengthwise down surface. Second: Flagellum longer than peduncle, of more than 50 segments. Peduncle, 2nd segment about ½ length 3rd, 3rd and 4th subequal, ½ length 5th.

Mouthparts. Maxilliped has 2 coupling spines.

Peraeopods. First: 4th and 5th segments posteriorly subequal but overlapping each other; 4th has about 4 spines distally on posterior margin, 3 on protuberance ½ along; posterodistally produced in setose-margined thumb about 1/3 along 6th segment, stout end spine on thumb. 5th has spine, seta, along posterior margin. Segment 6 has posterior margin as long as 5th, anterior twice as long, has 5 spines and setae. Dactylos long, tapering. Second: Generally similar, 3rd segment has 3 strong spines on posterodistal angle; 4th has 3 strong spines on anterodistal thumb which reaches ½ along segment 6; 5th has spine medially, 2 distally on posterior margin, is more distinct from segment 4 than in Gn. 1. Segment 6 slightly longer than 5, has 4–5 short spines on posterior margin. Dactylos has group of small spines near small end boss. Seventh: 2nd segment broad, especially distally where width ½ length; strongly setose on rounded anterodistal angle, all along posterior margin, also right along median surface flange. 3rd segment 2/3 2nd, triangular, anteriorly spinose and setae, posteriorly setose, distally spinose. 4th and 5th subequal, slightly shorter than 3rd; 4th-6th segments have 3–4 groups of spines and setae on anterior margin, spines and setae on posterodistal angle, rest of posterior margin naked; 6th slightly shorter than 5th.

Pleopods. Male stylet on 2nd reaches about 2/3 down endopod.

Uropods. Long acute peduncle process reaches ½ down endopod, has setose outer margin. Exopod slender, width about ¼ length, about 11 spines down outer margin, 3 on inner, 1 on distally narrowed tip, margins setose; exopod reaches about 2/3 down wide subrectangular endopod which has 6 spines on outer margin, outer distal angle distinct, inner rounded, distal margin has 8 spines, all margins setose. Distal width about 1/3 length.

Material Examined: Station COS (VUZ. 22), 2 males, 52–58 mm; Station BOP (VUZ. 41), 9 females, 42–48 mm; "Thomas Carrol", 4/4/53, Palliser Bay, 40 fathoms, 1 male, 60 mm.

Types: Slides Oc. 7 (VUZ. 22, male).

Distribution: Cook Strait, N.Z.

Discussion: Despite the large size of this species and the great number of species of Cirolana already known, I cannot identify these specimens with any previously described species. The prominent tubercles on the back of the male, and the strong backward prolongation of the 3rd abdominal segment are especially characteristic.

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Rocinela garricki n.sp. Male.

Rocinela garricki n.sp. Male.

Fig. 39.—Adult male. Fig. 40.—Ventral surface of head showing frontal lamina. Fig. 41.—Antenna 1. Fig. 42.—Antenna 2. Fig. 43.—Mandible and detail from palp surface. Fig. 44.—Maxilliped. Fig. 45.—Peraeopod. Fig. 46.—Peraeopod 7. Fig. 48.—Pleotelson and uropod. Fig. 49.—Portion of Pleotelson end margin and surface.

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The males from Station COS are noteworthy for the presence of developing gasteropod eggs on the ventral surface of the body between the legs. This is to my knowledge the first record of this unusual association. There is no evidence to indicate whether this develops into a commensal or parasitic relationship when the gasteropod is fully grown or not.

Cirolana pellucida Tattersall, 1921.

Cirolana Pellucida Tattersall, 1921: 206–207, pl. II, figs. 410.

Material Examined: Station KIIB (VUZ. 3), 'Regina, Stephens Island, 541217A', 4 females, 6–17 mm; Station GIIB (VUZ. 6), 1 female, 17 mm; Station CUF (VUZ. 19), 1 male, 8 mm, 1 female, 7 mm.

Distribution: Cook Strait; Terra Nova Stations 86, 129, 130 "off Three Kings Islands, plankton, from the surface and 3 metres"; Terra Nova Station 133, Spirits Bay, near N. Cape, N.Z., plankton, at 20 metres.

Discussion: Tattersall has remarked on the thin pellicle of this species, evident here in specimens from Station KIIB and CUF. Those from Station KIIB have a harder exoskeleton. The eyes show some variation; the KIIB specimens have a large subrectangular eye along most of the head; the GIIB specimen has one eye like this, the other superficially smaller and rounder like the CUF specimens. This is almost certainly due to leaching out of pigment. The CUF male has a somewhat blunter penis than that figured by Tattersall for his specimens; the GIIB specimen has small brownish-red pigment spots still visible over the body.

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.

Family Sphaeromidae
Sub-family Sphaerominae-Sphaerominae Platybranchiatae

Cassidina typa M. Edwards, 1840.

Cassidina typa M. Edwards, 1840: 224, pl. 32, figs. 10–16.

Tattersall, 1921: 226–227.

Cassidina neo-zealanica G. M. Thomson, 1889: 264, pl. 14, figs. 1–4.

Material Examined: Station BOL (VUZ. 43), 8 specimens; Station BOK (VUZ. 44), 2 males, 10mm, 6 females, 6–9 mm; Station BOL (VUZ. 48), 1 male, 12 mm; Station BOL (VUZ. 49), 1 female, 8 mm, ovigerous; 2 males, 10–11 mm.

Distribution: Cook Strait, Bay of Islands, Akaroa Harbour, Spirits Bay, Otago Harbour, Blueskin Bay.

Discussion: This flattened plate-like species is common on sandy bottoms around New Zealand from 0–100 fathoms. Thomson refers to it being found frequently on seaweed. It is common amongst the debris taken in flatfish trawls off Otago Harbour.

Family Serolidae

Serolis bromleyana, Suhm, 1874.

Serolis bromleyana Suhm, 1874: xix.

Beddard, 1884: pp. 53–57, pl. iv.

Sheppard, 1933: 329–330, 280.

Material Examined: Station BOP (VUZ. 41), 2 males, 22–23 mm, 3 females, 22–26 mm; Station DOP (VUZ. 51), 1 male, 15 mm (incomplete), 3 females, 11–23 mm, one at 23 mm ovigerous; Station HUL (VUZ. 53), 6 females, 12–20 mm; Station GUL (VUZ. 54), 48 males, 15–28 mm, 15 ovigerous females, 23–28 mm, 17 juveniles, 7–15 mm; Station FOOR (VUZ. 58), 1 female, ovigerous, 34 mm.

Distribution: Cook Strait; "off the east coast of New Zealand, in 1,100 and 700 fathoms, and close to the Antarctic Ice-Barrier in 1,975 fathoms".

Discussion: These trilobite-looking animals are apparently common and perhaps even a dominant part of the bottom fauna in the deeper waters around New Zealand.