Penteparatanais laevicarpus, Bird & Bamber, 2013

BIRD, GRAHAM J. & BAMBER, ROGER N., 2013, New littoral, shelf, and bathyal Paratanaidae (Crustacea: Peracarida: Tanaidacea) from New Zealand, with descriptions of three new genera, Zootaxa 3676 (1), pp. 1-71 : 55-56

publication ID	https://doi.org/ 10.11646/zootaxa.3676.1.1
publication LSID	lsid:zoobank.org:pub:7AB2D8F5-62F2-46D1-BDE4-BF91D6513797
persistent identifier	https://treatment.plazi.org/id/35FCFCE3-D074-4403-9425-BE080D2A46CD
taxon LSID	lsid:zoobank.org:act:35FCFCE3-D074-4403-9425-BE080D2A46CD
treatment provided by	Felipe
scientific name	Penteparatanais laevicarpus
status	sp. nov.

Treatment

Penteparatanais laevicarpus View in CoL sp. nov.

Figures 33 View FIGURE 33 –35

Material examined. Holotype: ♀, ( NIWA 76190 View Materials ), Stn SO191-3/238, “Rock Garden”, on the Hikurangi Margin , 105 km east-south-east of Cape Kidnappers, North Island, New Zealand, 39º58.64’S 178º14.14’E to 39º58.63’S 178º14.17’E, 907–908 m depth. GoogleMaps

Paratypes: one ov. ♀ (5.5 mm body length), seven other ♀♀, four non-ov. ♀♀, five mancae, paratypes ( NIWA 31945 View Materials ); one ♀ dissected; details as for holotype GoogleMaps .

Other material: one non-ov. ♀ (?), CR.012169, Stn O.651/BS.905, King Bank , NE of Three Kings Islands 123–128 m, pebbles, bryozoans and shell, 33˚ 57.4' S 172˚ 19.4' E, 1 February 1981; coll. NZOI / R.V. Tangaroa .

Description. Female: Habitus ( Fig. 33A View FIGURE 33 ) fairly slender, 6.3 times ltb; length 4.6–6.9 mm (holotype 6.9 mm). Cephalothorax 0.9 times as long as wide, just shorter than pereonites 1 and 2 combined. Pereonites slightly expanded mid-ventrally, pereonites 1–3 with single anterolateral setae; pereonite-1 shortest, pereonite-2 1.5 times as long as pereonite-1, pereonites 3–6 subequal, 1.8 times as long as pereonite-1 (pereonites respectively 2.7, 1.7, 1.4, 1.5, 1.3 and 1.3 times as wide as long). Pleon 1.2 times ltb, with pleotelson 0.27 times as long as total length; each pleonite four times as wide as long. Pleotelson almost semicircular, short, 2.3 times as long as pleonite-5, 1.7 times as wide as long.

Antennule ( Fig. 33B View FIGURE 33 ) as long as cephalothorax, article-1 nearly twice as long as broad, article-2 as long as broad, about one-third length of article-1, lateral simple seta longer than article width; article-3 0.6 times as long as article-2; article-4 naked, as long as article-3, twice as long as broad; article-5 almost as long as article-4. Antenna ( Fig. 33D View FIGURE 33 ) article-2 twice as long as article-3, weakly expanded distally, with large inferior apophysis and seta, superodistal seta short, superior margin naked, with distolateral seta; article-3 as long as wide, superodistal spine acute; article-4 as long as article-2, with one medial and three distal simple setae; article-5 two-thirds as long as article-4; article-6 with five distal setae.

Labrum ( Fig. 34E View FIGURE 34 ) typical paratanaidinid. Mandibles ( Fig. 34F–G View FIGURE 34 ) typical, left with slightly crenulate lacinia mobilis, molar with ca. 15 fine spines. Labium ( Fig. 34A View FIGURE 34 ) typical. Maxillule ( Fig. 31B View FIGURE 31 ) endite with eight terminal spines. Maxilla ( Fig. 34C View FIGURE 34 ) typical. Maxilliped ( Fig. 34D–E View FIGURE 34 ) basis seta exceeding distal margin of palp article-1; palp article-2 medial margin without modified seta; article-3 with two of the four medial serrulate setae also geniculate. Epignath ( Fig. 34F View FIGURE 34 ) typical, distally setulose.

Cheliped (Fig. 35A) basis as long as broad, posterior lobe smaller than anterior, naked; merus typical; carpus 1.7 times ltb; chela slightly longer than carpus, propodus slightly longer than broad, medial comb with eight spines ( Fig. 32B View FIGURE 32 ); dactylus with two lanceolate spines on incisive margin.

Pereopod-1 (Fig. 35C) basis 5.3 times ltb; merus 2.2 times ltb, as long as carpus, with inferodistal seta; carpus with three superodistal setae; propodus 1.2 times as long as carpus; unguis 1.8 times as long as dactylus, together as long as propodus. Pereopod-2 (Fig. 35D) more compact than pereopod-1; basis 4.6 times ltb; merus with inferodistal seta and finely serrate spine (as in detail on Fig. 35H); carpus slightly longer than merus, spines finely serrate; propodus about twice as long as carpus or merus, with one superodistal seta; dactylus-unguis combined shorter than propodus. Pereopod-3 (Fig. 35E) similar to pereopod-2.

On pereopods 4–6, all spines on the merus, carpus, and on inferodistal margin of the propodus, are finely serrate (as in detail on Fig. 35H). Pereopod-4 (Fig. 35F) basis robust, 2.9 times ltb, with one inferior PSS; merus typical; carpus as long as merus; propodus 1.3 times as long as carpus, superodistal seta as long as dactylus; shorter; dactylus-unguis combined 0.7 times as long as propodus. Pereopod-5 (Fig. 35G) similar to pereopod-4, but basis with two inferior PSS, carpus with four spines. Pereopod-6 (Fig. 35H), similar to pereopod-5, but propodus lacking superior PSS, and with three superodistal spines.

Pleopods ( Fig. 34H View FIGURE 34 ) all alike, endopod twice as long as broad, lateral margin with 19 setae and one distal on setulose medial margin; exopod three times ltb, proximal seta on lateral margin separated from remaining 23 setae by short gap.

Uropod ( Fig. 34G View FIGURE 34 ) peduncle 1.3 times ltb: exopod slender, one-segmented, and longer than segment-1 of endopod; endopod two-segmented, segment-2 with three simple setae and one PSS.

Non-ovigerous female: as female but smaller, length 3.1–4.1 mm (Stn O. 651 specimen 2.67 mm).

Manca-II: similar to non-ovigerous female but smaller (length 1.35–1.7 mm), pleopods and sixth pereopods absent; antennule ( Fig. 33C View FIGURE 33 ) of only four articles.

Male: unknown.

Distribution and ecology. So far, Penteparatanais laevicarpus sp. nov. is known with certainty only from the bathyal location (908 m), off the east coast of North Island, although there is a possible record from much shallower depths (123–128 m) north-east of the Three Kings Islands. It may be the deepest record of a Paratanais - like taxon, although comparable to that of Paratanais oculatus from 903 m ( Sieg 1986b).

Remarks. This species should be distinguishable from the two Paratanais species known from shelf and shallow bathyal localities in the same geographical area, P. hamulus and P. incomptus , by the characters given in the diagnosis, although the former is potentially a greater confusion species because of the similarity of the