Dardanus longior, Asakura, Akira, 2006
|
publication ID |
https://doi.org/ 10.5281/zenodo.172729 |
|
DOI |
https://doi.org/10.5281/zenodo.6259131 |
|
persistent identifier |
https://treatment.plazi.org/id/039D87E1-C437-1F68-4B5C-FC49DA3DF8ED |
|
treatment provided by |
Plazi |
|
scientific name |
Dardanus longior |
| status |
sp. nov. |
Dardanus longior View in CoL sp. nov.
( Figs. 23–29 View FIGURE 23 View FIGURE 24 View FIGURE 25 View FIGURE 26 View FIGURE 27 View FIGURE 28 View FIGURE 29 , 32 View FIGURE 32 )
Material examined
Holotype: ♂, SL 8.0 mm, Jarvis Island, Phoenix Islands, 2 Oct. 2002, coll. Scott Godwin, JAR11, AA05, BPBMS 12885. Paratypes: 2♂, SL 5.8, 8.5 mm, Jarvis Island, Phoenix Islands, 3 Sept. 2002, coll. Scott Godwin, JAR07, AA08, BPBMS 12884; 1♂, SL 5.7 mm, Jarvis Island, Phoenix Islands, 3 Oct. 2002, coll. Scott Godwin, JAR9P, AA 0 9, BPBMS 12886; 1Ψ, SL 4.0 mm, Baker Island, Phoenix Islands, 30 Jan. 2002, coll. Scott Godwin, BAK11P, AA04, BPBMS 12878; 1♂, SL 6.3 mm, Baker Island, Phoenix Islands, 23 Jan. 2002, coll. Scott Godwin, BAK09, AA06, BPBMS 12876; 1Ψ, SL 4.3 mm, Baker Island, Phoenix Islands, 24 Jan. 2002, coll. Scott Godwin, BAKUP, AA09, BPBMS 12877; 1♂, SL 9.6 mm, Howland Island, Phoenix Islands, 31 Jan. 2002, coll. Scott Godwin, HOWSP, AA02, BPBMS 12879; 1♂, SL 10.1 mm, Howland Island, Phoenix Islands, 31 Jan. 2002, coll. Scott Godwin, HOWSP, AA01, BPBMS 12880; 1Ψ, SL 3.1 mm, Howland Island, Phoenix Islands, 31 Jan. 2002, coll. Scott Godwin, HOWSP, AA03, BPBMS 12881; 1 ov.Ψ, SL 4.8 mm, 1♂, SL 3.7 mm, Howland Island, Phoenix Islands, 1 Feb. 2002, coll. Scott Godwin, HOW11P, AA07, BPBMS 12882; 1Ψ, SL 3.8 mm, Kingman Reef, Line Islands, 17 Mar. 2002, coll. Scott Godwin, KIN12, 13, SP, AA 10, BPBMS 12883,
Description
Shield ( Fig. 23 View FIGURE 23 A) slightly longer than broad or as long as broad; anterior margin between rostral lobe and lateral projections shallowly concave; lateral margins slightly convex, with rows of long setae. Dorsal surface of shield with scattered tufts of short setae; weaklycalcified Yshaped linea present posteriorly; gastric pits distinct. Rostral lobe only slightly protruded. Lateral projections bluntly triangular, produced. Posterior carapace lateral elements well calcified, unarmed. Branchiostegites unarmed.
Ocular peduncles ( Fig. 23 View FIGURE 23 A) 0.7–0.8 length of shield, subcylindrical, slightly inflated distally and basally; corneas only very slightly dilated. Ocular acicles ( Fig. 23 View FIGURE 23 C) broad; distal margins each with 2–4 spines. Interocular plate ( Fig. 23 View FIGURE 23 C) with pair of small protrusions.
Antennular peduncles ( Fig. 23 View FIGURE 23 A) slender, when fully extended, distal margins of ultimate segments reaching or slightly overreaching bases of corneas; ultimate and penultimate segments unarmed; basal segment with ventromesial distal angle bearing small spine.
Antennal peduncles ( Fig. 23 View FIGURE 23 A, B), when fully extended, slightly shorter than or equaling to ocular peduncles not including corneas; fifth to third segments unarmed; second segment with dorsomesial distal angle bearing 1–3 spines, dorsolateral distal angle produced, with 1–2 spines; first segment with ventrolateral distal angle with sharp spine. Antennal acicle ( Fig. 23 View FIGURE 23 B) terminating in simple or bifid spine; dorsomesial margin with 2–6 spines; dorsolateral margin with small subdistal spine. Antennal flagella sparsely setose.
Third maxilliped ( Fig. 23 View FIGURE 23 D, E) with welldeveloped crista dentata ( Fig. 23 View FIGURE 23 E); basis with or without corneous spine.
Chelipeds vastly unequal, left larger. Left cheliped very stout ( Figs. 24 View FIGURE 24 , 29 View FIGURE 29 B, C), slightly more elongate in males than in females. Dactyl terminating in large corneous claw; cutting edge with 4–10 variously sized calcareous teeth; upper and outer faces with numerous, truncate corneous tipped spines and numerous, small, truncate corneous spines each accompanied with 1–3 short setae. Fixed finger terminating in large corneous claw; cutting edge with 9–12 calcareous teeth. Palm and fixed finger with outer face bearing numerous, truncate corneoustipped spines and small, truncate corneous spines each accompanied with generally 1 (ranging 1–3) short seta ( Fig. 24 View FIGURE 24 B), lower half of outer face concave; lower margin with row of corneous or corneoustipped spines and stiff setae; lower portion of inner face with short corneous spines and tufts of stiff setae; upper face of palm with 1 or 2 irregular rows of prominent corneoustipped spines. Carpus with upper face and upper portion of outer face bearing many prominent corneoustipped spines and stiff setae, distal margin of outer face armed with small corneous spines and setae, outer face with many small corneous spines and stiff setae. Merus with dorsal and lateral faces bearing stiff setae; ventrolateral distal angle with several large corneoustipped spines; dorsodistal margin of lateral face with few large corneoustipped spines. Ischium unarmed.
Right cheliped moderately slender ( Figs. 25 View FIGURE 25 A–C, 29D, E), generally setose. Dactyl terminating in large corneous claw; cutting edge with several calcareous teeth; upper face with several strong corneoustipped spines and scattered small corneous spines; upper and outer faces with stiff setae. Fixed finger terminating in large corneous claw; cutting edge with several small calcareous teeth. Palm and fixed finger with upper, outer and lower faces with tufts of stiff setae; outer face bearing scattered small corneous spines and some larger corneoustipped spines; upper margin of palm with 1 or 2 irregular rows of prominent corneoustipped spines; lower face with 1 or 2 irregular rows of corneous spines and stiff setae. Carpus with upper face bearing 4 strong corneoustipped spines; outer and upper faces with stiff setae. Merus with lateral face bearing 0–2 corneoustipped spines on ventrodistal angle and few corneoustipped or calcareous spines on distal margin; outer and upper faces with stiff setae. Ischium unarmed.
Second ( Figs. 25 View FIGURE 25 D–H, 29F, G) and right third ( Fig. 28 View FIGURE 28 A, B) pereopods generally similar, but second pair more slender than right third; of second pair, left slightly shorter than right. Dactyls of second pair and right third as long as propodi, each terminating in strong corneous claw; dorsal, lateral and mesial surfaces with irregular rows tufts of setae; lateral and mesial faces generally convex and often with shallow longitudinal sulcus on midline of lateral face; ventral margins each with row of 3–5 corneous spines distally. Propodi 1.5–1.7 (second, Fig. 25 View FIGURE 25 F, G) or 1.8–1.9 (right third) length of carpi; dorsal faces flat and broad (second) or comparatively narrower (right third), armed with numerous (second) or comparatively fewer numbers of (right third) corneous spines, dorsodistal margins armed with corneous spines (second) or unarmed (third); lateral faces with few longitudinal rows of tufts of setae. Carpi 0.5–0.6 (second) or 0.6–0.7 (right third) length of meri; dorsodistal angle with corneoustipped spine. Meri with ventrodistal angle of lateral face bearing spine (second) or unarmed (third), ventrolateral margins with several, small corneoustipped spines (second) or unarmed (third). Ischia unarmed.
Left third pereopod ( Figs. 26 View FIGURE 26 , 27 View FIGURE 27 , 28 View FIGURE 28 H, I) stout. Dactyl ( Fig. 26 View FIGURE 26 ) as long as propodus, broad, terminating in strong corneous claw; lateral surface ( Fig. 26 View FIGURE 26 A, C, D) with dorsal row of strong corneous spines ( Fig. 26 View FIGURE 26 Ca), dorsal half with deep longitudinal concavity ( Fig. 26 View FIGURE 26 Cb) bearing tiny spines, ventral 0.3–0.5 with numerous strong spines in distal 0.5–0.6 ( Fig. 26 View FIGURE 26 Cc) and 1–3 rows of large protuberances armed distally with 1–5 strong truncate spines ( Fig. 26 View FIGURE 26 D), most ventral row of these protuberances ( Fig. 26 View FIGURE 26 Dd) continuing to large lobes on ventromesial margin; ventral margin ( Fig. 26 View FIGURE 26 F) with proximal 0.4–0.5 bearing series of deep furrows producing row of large lobes, ventromesial margin of each lobe armed with 1 or 2 very large, conical corneous spines ( Fig. 26 View FIGURE 26 F), distal 0.4–0.6 of ventral margin with few strong corneous spines; mesial face ( Fig. 26 View FIGURE 26 B, E) strongly convex, with numerous strong corneous spines on dorsal half and rows of long stiff setae; dorsal margin with row of strong corneous spines and rows of dense long setae. Propodus ( Fig. 27 View FIGURE 27 ) 1.5–1.6 length of carpus, broad; dorsal margin with series of furrows producing row of lobes, lateral face of each lobe armed distally with generally 2–4 (ranging 1–6) flattened, elongate rectangular, corneous spines ( Fig. 27 View FIGURE 27 Aa) and dorsomesial surface of each lobe with 1–4 strong spines and stiff setae ( Fig. 27 View FIGURE 27 B); lateral face ( Fig. 27 View FIGURE 27 A) with dorsal half bearing very deep longitudinal concavity ( Fig. 27 View FIGURE 27 Ab) with scattered short spinules, separated by strong narrow medial longitudinal elevation ( Fig. 27 View FIGURE 27 Ac) with 1 or 2 irregular rows of protuberances each bearing marginal 1–7 flattened, elongate rectangular corneous spines, from ventral 0.3–0.4 concave ( Fig. 27 View FIGURE 27 Ad) with 1 or 2 irregular rows of protuberances each armed with many marginal flattened, elongate rectangular corneous spines; ventral margin with series of deep furrows producing row of large lobes, lateral face of each lobe ( Fig. 27 View FIGURE 27 Ae) armed with many marginal flattened, elongate rectangular corneous spines and strong ventrodistal spine, ventromesial margins of ventral lobes ( Fig. 27 View FIGURE 27 C) each with 1–4 very large, conical corneous spines and stiff setae; mesial face ( Fig. 27 View FIGURE 27 B) strongly convex, with few rows of tufts of very long setae, dorsal margin with row of strong spines and long setae, dorsal half of mesial surface with many strong spines and setae, dorsal half of distal margin armed with corneous spines and fringed with setae. Carpus 0.7–0.8 length of merus. Armament and setation of carpus, merus and ischium similar to those of right third.
Sternite of third pereopods with anterior lobe bearing 1 or 2 rounded projections ( Fig. 23 View FIGURE 23 F, G), with long setae anteriorly.
Fourth pereopod ( Fig. 28 View FIGURE 28 C) semichelate; dactyl with few short corneous spines on lateral face ventrally; propodal rasp well developed; carpus with 1–3 sharp corneoustipped dorsodistal spines.
Fifth pereopod chelate; rasps of dactyl and propodus well developed.
Male pleon ( Fig. 28 View FIGURE 28 D) with second to fifth small left pleopods, fringed with setae; small, elongate fleshy membranous protuberance ( Fig. 28 View FIGURE 28 E) with setae present between fourth and fifth pleopods. Female pleon ( Fig. 28 View FIGURE 28 F) with second to fifth left pleopods, fringed with setae; second to fourth large, triramous; fifth small, with slender exopod; elongatetriangular fleshy membranous protuberance fringed with setae present between fourth and fifth pleopods.
Uropods markedly asymmetrical, left larger than right; endopods and exopods with welldeveloped rasps.
Telson ( Fig. 23 View FIGURE 23 H, I) with lateral constrictions; marginal area partially calcified; posterior lobes separated by median cleft, left more extended posteriorly than right, with 5–10 spines and long setae on terminal margin.
Color
Color in life unknown. Color in preservative (two years after collection) ( Fig. 29 View FIGURE 29 ): dorsal surface of shield mottled pink or pale orange and white, with dark brown area, midanteriorly. Ocular peduncles pinkish or pale orange. Chelipeds and ambulatory pereopods generally mottled pink or pale orange and white. Tips of fingers of chelipeds and dactyls of ambulatory pereopods whitish; carpi and meri of chelipeds each with bright orange area; carpi of ambulatory pereopods each with dark brown area; articulation of carpi and meri of ambulatory pereopods whitish. Lateral and mesial faces of dactyls of chelipeds and ambulatory pereopods each with small dark brown spot. Bases of tufts of setae on lateral and mesial faces of dactyls and propodi of chelipeds and ambulatory pereopods often dark brown or red. Posterior carapace and pleon pinkish, with mottled white and red.
Etymology
From the Latin longior , the comparative degree of the Latin longus (=long), referring to the comparatively longer propodus of the left third pereopod in this species among the D. sanguinocarpus species complex.
Distribution
Phoenix Islands and Line Islands ( Fig. 32 View FIGURE 32 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.