Neotanais barfoedi Wolff 1956

Neotanais barfoedi Wolff, 1956

Neotanais barfoedi Wolff, 1956c:44, fig. 2a,b, pl. 2: figs. 3–6.

DIAGNOSES.—Stages Other Than Copulatory Male: *Pereonites 4–6 square, about as long as wide. *Pleotelson short compared to most species, about twice as wide as long, and sities forming acute angles laterally. *Pleonal epimeres rounded laterally in dorsal view and each with 1 to 3 weak, feathered hairs; *sternites with moderately developed, posteriorly directed, midventral protuberances. *Carapace with 4 or 5 short anterolateral setae and 5 or 6 posterolateral setae. *Chela with high dorsal crest; dactylar teeth low, rounded, and irregular. Uropodal endopods relatively heavy, articles stout, some relatively short. Anterior setal rows of propodi and carpi of pereopods II–IV composed of relatively stout spines with heavy teeth. Article 1 of first antenna with a length-width ratio of about 3. Ischia of pereopods each with at least 1 long, thick seta and about 2 very short, weak setae.

Copulatory Male (only one type known): *Pleotelson, *carapace setae, ischial setae of pereopods, and uropods similar to those of other stages. *Chelipedal carpus very strongly S-shaped proximally and bearing about 5 short, weak dorsal setae and 2 slender and equal ventral setae; *dorsal surface of propodus nearly straight, without pronounced crest, and with fine, anteriorly directed serrations; fixed finger twisted but not lying in a plane very different from that of dactylus; dentition of fingers as in Figure 66A,B. Row of short, subterminal propodal spines on pereopod VII about 17 in number and tiny, naked, and triangular.

DESCRIPTION OF PREPARATORY MALE D (Galathea Sta. 665).—See “Remarks” below.

Body (Figure 65A): 17.3 mm long and 7.4 times longer than wide.

Carapace: 1.4 times longer than wide. Anterolateral keels moderately well developed; 4 or 5 anterolateral setae and 5 or 6 posterolateral setae occurring in rows on each side. Oblique furrows moderately deep and appearing to converge posteriorly in a fine, incomplete, U-shaped line. Respiratory chambers and chelipedal coxae relatively well expanded in dorsal view.

Pereonites: Peronites 4–6 generally square in dorsal view, pereonite 5 (Figure 65C) only 1.2 times wider than long; area over pereopods not always the widest part of somite. Pereonite 7 with 2 small, uncalcified male gonopore anlagen borne on slightly raised, ventral, genital cone anlagen.

Pleonites (Figure 65D,F): Rounded laterally in dorsal view and bearing 1 to 3 fine, feathered dorsal hairs on epimeres. Pleonite 1 about as wide as pereonite 7 and not appreciably wider than pleonite 5. Sternites bearing posteriorly directed, midventral protuberances.

Pleotelson (Figure 65D,F): Noticeably short compared to many species, only 2.1 times wider than long.

First Antenna: First article 3.2 times longer than wide.

Left Mandible: Mandibles of this specimen in very poor condition; holotype described here (Figure 65H). Lacinia mobilis with 3 sharp teeth; posterior lobe pointed (preparatory male D with a small notch in lobe). Second spine serrate on outer half of both sides; first spine serrate on distal half of outer side and almost entirely serrate on inner side.

Right Mandible (holotype): Third incisive spine with short point; first two spines and pars molaris as in left mandible.

Second Maxilla: Fixed lobe with forked spines variable, only one observed clearly due to poor condition of specimen. This one (Figure 65I) with 3 points (see holotype, Figure 65J). Medial row composed of 22 setae with long setules and three setulated spines.

Maxilliped: Setal formula of palp, (1,0,5 + 1,8,12).

Cheliped (Figure 65C,D): Carpus with 10 relatively long dorsal setae. Dorsal propodal crest prominent. Cutting edge of fixed finger irregular proximally but without denticles. Distal teeth rounded and somewhat irregular. Dactylar teeth irregular, low, rounded, and about 4 in number.

Pereopods II–VII: Dactylar spine of pereopod II is 0.2 times as long as dactylus. Short, terminal propodal spine on same leg relatively straight and bearing 9 large teeth (Figure 67B). Short, subterminal carpal spine of same leg straight, stout, and with 5 large teeth. Posterior propodal setae long, thin, and very finely setulated except for distalmost 1 or 2 setae which have much larger setules (Figure 67A). Anterior propodal setal row composed of very stout, heavily toothed spines, the first three of which are especially heavy. Anterior carpal setae heavy and serrate as in propodus (same figure). Ischia each with at least 1 long, thick seta and about 2 very short, weak setae. Setal formulae of pereopods II–VII respectively: (8,7,9,8), (9,9,8,9), (10,11,9,9), (7,7,11,8), (9,8,9,10), and (7,7,8,9). Short, subterminal propodal spines of pereopod VII shaped as in other species and 17 in number. Dactylar teeth of pereopods V–VII moderate in size, bluntly tipped, and continuous, with relatively large proximal denticular rows; dorsal, U-shaped denticular row short, composed of comparatively large denticles (Figure 67E).

Pleopods: Terminal endopodal setal row distinct from lateral row. Terminal setae 0.66 times as long as endopod. Setal formula, (2,3) (3,15,7) (0,6;0,11,9).

Uropods: Endopodal articles stouter than in many species; 9 and 10 articles present on left and right sides, respectively. Exopod 0.6 times as long as first endopodal article.

DESCRIPTION OF COPULATORY MALE. F (Galathea Sta. 668).—Body (Figure 65B): 13.5 mm long and 6.1 times longer than wide.

Carapace: 1.5 times longer than wide with 3 anterolateral setae below well-expanded keels and 3 or 4 posterolateral setae. Oblique furrows relatively pronounced. Transverse lines present behind rostrum and between chelipedal coxae.

Pereonites: Appear wider than long in dorsal view, pereonite 5 is 1.4 times wider than long; sides gradually widen posteriorly to area of pereopodal attachment, which is considerably wider than anterior end.

Pleonites (Figure 65B,E,G): Rounded laterally in dorsal view as in other stages, each bearing a few apparently unfeathered hairs and with a middorsal longitudinal depression. Pleonite 1 slightly wider than pereonite 7 and pleonite 5. Sternites extended into longer midventral spurs than in other stages.

Pleotelson (Figure 65E,G): About as wide as last pleonite and 1.8 times wider than long, appearing short as in other stages.

First Antenna: First article 5.7 times longer than wide.

Maxilliped: Palp very long and thin; setal formula (1,0,1 +1,2+1,ca. 6).

Cheliped: Carpus remarkably twisted into an S-shape proximally and bearing 5 weak dorsal setae in area of twist and 2 thin and equal ventral setae (Figure 66A). Propodus with dorsal surface not especially crested but relatively straight and with fine dorsal serrations or cuticular extensions. Fixed finger twisted but both fingers lying in nearly the same plane (Figure 65K). Fixed finger bearing 2 dorsal setae and 1 ventral seta. Proximal surface expanded and relatively flat dorsally following a large, rounded protuberance; two small, more distally located bumps followed by a tooth just proximal to claw. Dactylus with a large, proximal, ventral protuberance bearing 3 rounded, successively longer teeth and a large, triangular distal tooth.

Pereopods II–VII: Setal formulae (8,6,8,8), (10,17,7,10), (10,16,7,10), (8,8,11,8), (8,9,9,10), and (7,7,8,7). Setae in anterior rows without marked teeth in contrast to those of other stages, but with much finer setules. Ischial setation as in other stages. Short, terminal propodal spines of pereopods II—IV slender and naked (Figure 67C). Short, subterminal carpal spine of pereopod II slender but with a few teeth (Figure 67D). Dactylar teeth of pereopods V–VII as in other stages (Figure 67E). Short, subterminal spines of pereopod VII are 17 in number, but very tiny and triangular in contrast to other stages (Figure 67F).

Pleopods: Setal formula, (2,3) (3,15,8) (0,4;0,11,10). Terminal endopodal setae 1.4 times longer than article.

Uropods: With 9 articles in each endopod; exopod 0.48 times the length of first endopodal article.

INTRASPECIFIC VARIATION.—Stages Other Than Copulatory Male: Body Length: Sta. 665: juvenile, 9.5 mm (estimated) and 9.7 mm; preparatory female 2, 11.8 mm; preparatory male, 15.8 mm (holotype), 17.3 mm.

Second Maxilla: The two forked spines of the fixed endite in preparatory female 2 E, Sta. 665, are b1ifid as in most species. The holotype has one bifid and one uncleft spine (Figure 65H); however, each of these has one secondarily split point. In both female E and the holotype, only two spines are present along the medial row, in both cases with fine setules of moderate length on at least one side.

Chela: The chela of the holotype (Figure 66E) has proximal denticles along the cutting edge of the fixed finger. Its dactylar teeth are more distinct than in the animal described above.

Pereopods II–VII: The setal formula of pereopod II of the holotype is (7,6,8,7). Pereopod VII bears 15 short propodal spines in the posterior row.

Copulatory Males: Body Length: Sta. 668: copulatory male, 13.5 mm (described specimen), 15.6 mm (another of same developmental stage).

Chela: The “cutting edge” of the dactylus is irregular proximal to the first tooth in male G (Sta. 668), and it is not expanded as in the described male F (cf. Figure 66A,B).

POSTMARSUPIAL DEVELOPMENT.—Surprisingly enough, the uropods of all stages, juveniles through copulatory males, have nine endopodal articles. Juvenile C has two male gonopore anlagen on the ventral surface of pereonite 7. It is not possible to say whether the two copulatory males are primary or secondary. They do not come from the same station as the other specimens, and hence their body lengths cannot, with certainty, be compared with the latter.

MATERIAL.—Galathea Sta. 665, north of New Zealand and southwest of the Kermedec Trench, 2470 m, 2 Juv, 1 P 2, 2P ♁ (including holotype and a specimen described here); Galathea Sta. 668, near same locality, 2640 m, 2 Cop ♁ (including specimen described here).

LOCATION OF MATERIAL.—UCZM: All material.