Harbansus barnardi Kornicker 1978

Harbansus barnardi

ETYMOLOGY.—The species is named after J. Laurens Barnard, Smithsonian Institution, who collected the specimens.

HOLOTYPE.—USNM 156907, ovigerous female on slide and in alcohol.

TYPE-LOCALITY.—JLB Hawaii 10 (see Barnard, 1970), Sampan Pass, Kaneohe Bay, Oahu, 2 m.

PARATYPE.—USNM 156906, 1 A–1 male from same sample as holotype.

DISTRIBUTION.—Known only from the type-locality.

DESCRIPTION OF ADULT FEMALE (Figures 27–29d; Plate 12).—Carapace (Figures 27–28b): Elongate with prominent rostrum and caudal process.

Ornamentation: Ventral and anterior margins of rostrum with minute protuberances (Figures 27, 28a); posterodorsal corner of carapace with faint low ridge (Figures 27, 28b); surface of valve with abundant shallow fossae (Plate 12a,b); bristles scattered over valve surface (Plate 12a–d) and along ventral margin, also near outer edge of caudal process; 2 bristles present on edge of valve at inner end of incisur (Figure 28a); surface between shallow fossae with shallow pores (Plate 12b–f); minute nodes with central pit forming row around rim of fossae (Plate 12b,e).

Infold: Rostral infold with 7 or 8 long bristles; 1 short bristle on infold just ventral to inner end of incisur; anteroventral infold with 7 parallel ribs and 1 short bristle near ventral margin; posterior half of ventral infold anterior to caudal process with 4 or 5 small bristles; infold of caudal process with 7 setose bristles along anterior edge of pocket; 1 small bristle near inner edge of infold opposite dorsal end of caudal process.

Selvage: Wide lamellar prolongation with fringed edge present in vicinity of incisur, narrower along anterior and ventral margins.

Size: USNM 156907, length 1.01 mm, height 0.53 mm.

First Antenna (Figure 28c): 1st joint: spines on lateral surface. 2nd joint: spines along ventral and dorsal margins and on medial and lateral surfaces, and with 1 spinous dorsal bristle. 3rd joint: short, with spines on ventral margin and medial surface, and with 3 bristles (1 ventral, 2 dorsal). 4th joint: faint hairs along ventral and dorsal margins and with 5 bristles (3 ventral, 2 dorsal). 5th joint: sensory bristle with 2 short proximal filaments and 1 short and 2 long terminal filaments excluding stem (stem with 2 minute spines at tip, filaments with only 1). 6th joint: medial bristle about same length as 5th joint, with minute spine at tip. 7th joint: a-bristle slightly longer than bristle of 6th joint; b-bristle slightly shorter than sensory bristle of 5th joint, with 2 short subterminal filaments (stem with 2 minute spines at tip, filaments with only 1); c-bristle same length as sensory bristle, with 1 short proximal filament, 1 filament near middle, and 3 subterminal filaments (1 short, 2 longer) excluding stem (stem with 2 minute spines at tip, filaments with only 1). 8th joint: bare d- and e-bristles of equal length, same length as sensory bristle; f-bristle similar to c-bristle; g-bristle similar to f-bristle but slightly longer.

Second Antenna: Protopodite bare. Endopodite 2-jointed (Figure 28d): 1st joint with 3 short anterior bristles; 2nd joint elongate, with 1 long spinous ventral bristle and 1 short terminal bristle. Exopodite: 1st joint with short, recurved, terminal, medial bristle; 2nd joint with bristle reaching just past 9th joint, with about 12 stout ventral spines, no natatory hairs; bristles of joints 3–8 relatively short, with stout ventral spines but no natatory hairs; 9th joint minute, with 1 or 2 bristles (longest of these ventral, with slender ventral and dorsal spines; dorsal bristle when present very short, with minute dorsal spine); joints 2–8 with fairly long spines forming row along distal margin, but no basal spines.

Mandible (Figure 28e,f): Coxale endite spinous, bifurcate, no bristle observed near base. Basale: medial side with 3 short bristles in proximal ventral corner, 1 short bristle near middle close to ventral margin, and long hairs forming rows; lateral surface with 2 bristles close to middle of ventral margin, and few long hairs; ventral margin with I terminal bristle; dorsal margin with 1 mid-bristle and 2 terminal bristles. Exopodite hirsute, about two-thirds length of dorsal margin of 1st endopodite joint, with 1 long subterminal bristle and 1 short terminal bristle. Endopodite: 1st joint with ventral margin with 3 bristles (1 short, 2 long; short bristle not visible in Figure 28e); 2nd joint with ventral margin with bristles forming 2 distal groups (proximal group with 2 bristles, distal group with 3 bristles including 1 clawlike bristle), dorsal margin of joint with bristles forming 2 groups near middle (2 bristles in proximal group, 5 in distal group); end joint with 2 stout subequal claws, 1 minute dorsal claw, and 3 bristles.

Maxilla (Figure 28g): Coxale with dorsal margin hirsute, with spinous dorsal bristle. Endite I with 5 or 6 bristles; endite II with 6 bristles; endite III with 9 terminal bristles and 1 proximal bristle. Basale with distal margin with 3 bristles. Exopodite with 2 long bristles (with long hairs near middle) and 1 short bare bristle. Endopodite: 1st joint with 1 α-bristle and 3 β-bristles; end joint with 2 stout claws and several bristles.

Fifth Limb (Figure 28h): Endite I with 1 short bristle; endites II and III indistinct but with total of about 10 bristles. Exopodite: 1st joint with main tooth with 3 constituent pectinate teeth and 1 proximal smooth tooth; spinous bristle present on edge proximal to constituent teeth; anterior side with 2 bristles at middle of distal edge; posterior side with 2 or 3 bristles; 2nd joint with large squarish tooth; 3rd joint with 2 bristles on outer lobe and 3 on inner lobe; 4th and 5th joints fused, hirsute, with total of 6 bristles.

Sixth Limb (Figure 29a): Endite I with 3 bristles; endite II with 3 bristles: endite III with 6 bristles; endite IV with 5 bristles; end joint with 4 spinous anterior bristles and 2 hirsute posterior bristles; limb hirsute in vicinity of posterior margin; 1 short bristle in place of epipodial bristle.

Seventh Limb (Figure 29c): 2 bristles in proximal group (1 on each side); 6 bristles in distal group (3 on each side); each bristle with distal marginal spines and up to 6 bells; terminus with comb of about 7 teeth opposite 3 spinous pegs.

Furca (Figure 29b): Each lamella with 6 claws: claws 1, 2, and 4 primary; claws 3, 5, and 6 secondary; claw 1 with stout teeth along proximal half of lateral and medial margins, and slender teeth distally; claws 2 and 4 with teeth along posterior margins; hairs present along lamella following claw 6.

Rod-shaped Organ (Figure 29d): Elongate with about 7 sutures in proximal half and with rounded tip.

Eyes (Figure 29d): Medial eye bare, lightly pigmented. Lateral eyes about one-half length of medial eye, with 3 minute ommatidia; lateral eye hidden behind protopodite of 2nd antenna when animal viewed laterally.

Upper Lip (Figure 29d): Hirsute, projecting anteriorly.

Y-Sclerite (Figure 29b): Normal for family.

Genitalia (Figure 29b): Oval sclerotized ring on each side of body.

Eggs: USNM 156907 with 2 eggs in marsupium.

DESCRIPTION OF A–1 MALE (Figure 29e–h).—Carapace (Figure 29e): Similar in shape to that of adult female.

Ornamentation: Surface of valve with abundant shallow fossae; minute protuberances with central pit forming row just within edge of fossae; surface of valve between fossae with minute pits with low raised rim; bristles emerging from closed pores with irregular raised rim scattered over valve surface and along ventral margin, also near outer edge of caudal process; 2 bristles present on edge of valve at inner end of incisur.

Infold: Rostral infold with 7 long bristles; 1 short bristle present near inner end of incisur; anteroventral infold with about 7 parallel ribs; ventral infold near caudal process with 5 short bristles forming row; infold of caudal process with 6 setose bristles along anterior edge of pocket.

Selvage: Similar to that of adult female.

Size: USNM 156906, length 0.89 mm, height 0.45 mm.

First Antenna, Mandible, Maxilla, 5th Limb (Figure 29g), 6th Limb, Furca: Similar to those of adult female.

Second Antenna: Protopodite similar to that of adult female. Endopodite 3–jointed (Figure 29f): 1st joint with 3 small anterior bristles; 2nd joint elongate with 3 proximal ventral bristles; 3rd joint elongate with 2 small terminal bristles. Exopodite with 2 bristles on 9th joint of both limbs, otherwise similar to that of adult female.

Seventh Limb: 4 bristles in distal group, each with distal marginal spines and 4 bells; bristles tapering distally (juvenile character); no proximal bristles; terminus with comb with 3 or 4 teeth opposite single spinous peg.

Rod-shaped Organ (Figure 29h): Similar to that of adult female.

Eyes (Figure 29h): Medial eye similar to that of adult female. Lateral eye about same size as medial eye, with about 9 minute ommatidia.

Upper Lip (Figure 29h): With minute anterior processes.

COMPARISONS.—The new species Harbansus barnardi differs from previously described species in having a terminal claw on the ventral margin of the 2nd endopodial joint of the mandible that is about three-fourths the length of the largest claw of the end joint.

Harbansus species A

MATERIAL.— USNM 157752, I ovigerous female from off Guadalupe Island, Mexico, R/V Velero III, sta 1927, 73.2–102.4 m.

DESCRIPTION OF ADULT FEMALE (Figure 30; Plate 13).—Carapace (Figure 30a): Similar in shape to that of Harbansus mayeri but slightly larger.

Ornamentation: Surface without lateral ribs or posterior nodes; ventral half of rostrum with low lateral process; surface with shallow fossae (Plate 13a–c); anterior and ventral margins of rostrum with about 14 minute tubercles (Plate 13b); 2 bristles at inner edge of incisur; bristles scattered over valve surface and along ventral and anterodorsal margins, some with pore near base (Plate 13d); surface with few pores (Plate 13e) and minute pustules (Plate 13d,f).

Infold: Rostral infold with 4 bristles; single short bristle just below inner end of incisur; 7 short bristles along inner edge of posterior half of ventral infold; infold of caudal process with 6 or 7 frond like bristles.

Selvage: Similar to that of H. mayeri.

Size: Length 1.18 mm, height 0.64 mm.

First Antenna, 2nd Antenna (Figure 30b), Mandible, Maxilla, 5th Limb: Similar to those of H. mayeri.

Sixth Limb: Endites I and II with 3 bristles; endites III and IV each with 5 bristles; end joint with 4 or 5 spinous anteroventral bristles separated by space from 2 posterior hirsute bristles; 1 short bristle in place of epipodial bristle.

Seventh Limb: 2 bristles in proximal group (1 on each side); 4 bristles in distal group (2 on each side); each bristle with up to 4 bells and distal spines; terminal comb with 5 recurved teeth opposite smaller comb with about 3 short teeth.

Furca, Rod-shaped Organ (Figure 30c), Genitalia, Brushlike Organ, Upper Lip (Figure 30c): Y-Sclerite, Posterior of Body: Similar to those of H. mayeri.

Eyes (Figure 30c): Medial eye pigmented, bare; lateral eyes small, faint, unpigmented, with 5 ommatidia.

Eggs: Holotype with 5 eggs in brood chamber.

COMPARISONS.—The specimen designated herein Harbansus species A, may be conspecific with Harbansus mayeri. It is separated from that species because Harbansus species A has only 4 instead of 7–8 bristles on the rostral infold. Also the carapace of H. species A is slightly larger than known specimens of H. mayeri, and does not have posterior nodes such as those present on H. mayeri. Having only 1 specimen of H. species A, it was not possible to determine whether the differences noted between H. species A and H. mayeri could be intraspecific variation.

Harbansus species B

MATERIAL.—USNM 157753, 1 ovigerous female from Santa Rosa Island, California, R/V Velero III, sta 23086, 140 m.

DESCRIPTION OF ADULT FEMALE.—Carapace (Figures 31, 32a:) Similar in shape to that of Harbansus bradmyersi but somewhat larger.

Ornamentation: Surface with lateral ribs (Figures 31, Figures 32a; Plate 14a–c); rib dorsal to central muscle scar area angling upward posteriorly; rib passing through muscle scar area terminating posteriorly in vicinity of caudal process (Plate 14c); surface with shallow fossae (Plate 14a–c); bottom of fossae with small nodes with central pore (Plate 14c–e); central pore of nodes with minute inner teeth (Plate 14f); surface between fossae with pore fields (Plates 14d, e, 15c,d); surface between pore fields with minute pustules (Plate 15a,c,d); surface with widely scattered long bristles having pore near base (Plates 14d,e, 15a,b); minute nodes with central pore also present along dorsal margin in vicinity of 2 narrow dorsal ribs (Plate 15e); narrow ligament connecting dorsal edges of valves (Plate 15e,f).

Infold and Selvage: Similar to those of H. bradmyersi except 4–6 bristles on rostral infold.

Size: Length 1.26 mm, height 0.71 mm.

First Antenna: Similar to that of H. bradmyersi.

Second Antenna: Similar to that of H. bradmyersi (Figure 32b).

Rod-shaped Organ, Eyes, Upper Lip (Figure 32c): Similar to those of H. bradmyersi.

Remaining Appendages: In general, similar to those of H. bradmyersi.

COMPARISONS.—This species differs from H. bradmyersi in having the upper lateral rib on carapace oriented at a distinct angle, not horizontal as on H. bradmyersi.

MATERIAL.—USNM 157755, 1 adult female from off west end of Santa Catalina Island, California, R/V Valero III, sta 24075, 414 m.

DESCRIPTION OF ADULT FEMALE.—Carapace: Of unique specimen decalcified, film-like, no lateral ribs apparent, but because of poor condition of specimen the possibility that they were once present cannot be excluded.

Size: Length of distorted shell 1.43 mm, height 0.83 mm.

Appendages: Not all appendages examined in detail, but in general similar to those of H. mayeri.

Second Antenna: Endopodite similar to that of H. mayeri (Figure 33a).

Rod-shaped Organ, Eyes (Figure 33b): Rod-shaped organ with about 8 sutures and pointed tip; medial eye pigmented, bare; lateral eye faint, unpigmented, with 5 ommatidia.