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Some Amphipoda, Isopoda and Tanaidacea from Cook Strait

Group Jaeropsini — Genus Jaeropsis Koehler

Group Jaeropsini
Genus Jaeropsis Koehler

Jaeropsis palliseri n.sp. (Figs. 67–73, 108–117).

Diagnosis: Eyes near lateral margin. Anterolateral angles of cephalon bluntly rounded, not significantly produced anteriorly. Rostral process subrectangular, anterior margin somewhat sinuate. Maxilliped endite has 5 coupling spines. Distal angle of maxilliped palp 2nd segment not produced. Pleotelson margins smooth, entire. Exopodite of uropod has 1 segment. Body has purplish-brown pigmentation with white mottling on all segments, posterolateral portion of head and lateral angles of body somites unpigmented.

Body. Animal elongate, flattened, dorsally smooth, lacking noticeable setae. Cephalon wider than long. Frontal margin has shallow lateral concavities separated by central shallow, but more anteriorly produced, concavity, into which rostral projection fits. Eyes dorsal, a page 19 little in front of halfway. Peraeon has no epimeral plates visible in dorsal view. 1st and 2nd somites equally long, 5th shortest. Pleotelson wide, shield-like. Posterior median projection semi-acute, does not reach distally as far as tips of uropods.

Antennae. First: Of 6 segments, 1st as long as other 5, twice as wide, has scattered fine setae, 2 plumose sensory setae on distal angle. Last 2 segments have 2 elongate flaccid sensory setae each, a few fine setae. Second: Peduncle 5th segment about ¾ length 6th, both distally expanded on inner margin; outer and end margins and surface of 6th have fine setae; 6th segment of peduncle ¾ length 1st flagellar segment which is more than twice length remaining 5 flagellar segments; segments all setiferous, 1st especially on surface and outer margin.

Mouthparts. Maxilliped: Palp of 5 increasingly narrower segments, 1st short, 1/3 length 2nd, ¼ length 4th; 3rd almost twice length 1st and 5th; inner margins of 3rd and 4th bristled, a few setae especially on end of 5th. Endite has only about one distinct spine on inner concavity of end margin, but about 5 spine-teeth. Maxilla 1: Inner plate has 4 apical setae, outer 11 denticulate spines. Maxilla 2: Outer plate lappets have 4 apical setae each, inner plate also has 4. Mandible: Lacinia absent. Incisive part has 5–6 teeth, setal row of 9 setae; molar long and needle-like, damaged in mounted appendage. Palp of 3 segments, 1st slightly longer than subequal 2nd and 3rd; 2nd has 5 plumose setae distally, 3rd has 10–11 along inner margin.

Peraeopods. First: Dactylos has 2 claws, propod has 5 spines on posterior margin, most of margin and distal ¼ of carpus posterior margin finely tooth-combed. Seventh: Dactylos has 3 claws, propod posterior margin has 6 spines, is finely tooth-combed. Others: Have 3 claws like 7 th.

Pleopods. 1st in male has produced rounded posterolateral angles, medially produced setiferous end margin.

Uropod. Peduncle, wide, subrectangular, with rounded angles, end margin setose, medially excavate with small scale-like rami, both rami distally setose.

Material Examined: Station BOL (VUZ. 43), Holotype male, length 5.3 mm; width 1.4 mm.

Holotype: Slides Oc. 3.

Distribution : Cook Strait.

Discussion: According to Chilton (1912), young specimens of neo-zelanica (? = curvicornis; cf. Stebbing, 1905: 51–52, pl. XI.C) have several serrations on the pleon margins, older specimens have one serration. Since his material came from several localities, I am inclined to believe that he had more than one species; in any event, it appears that his material was different from the species described above. Nearest to J. palliseri are J. paulensis and J. lobata; the latter appears to be distinct in rostral process and, by inference from its possible identity with J. dubia (Menzies, 1951), in the uropods and other features.