Pasiphaea antea, Rodrigues & Alves-Júnior & Cardoso, 2018

Rodrigues, Thaiana G. A., Alves-Júnior, Flavio A. & Cardoso, Irene A., 2018, A new species of Pasiphaea Savigny, 1816 (Crustacea, Decapoda, Pasiphaeidae) from the southwestern Atlantic, Zootaxa 4418 (5), pp. 493-498: 494-498

publication ID

https://doi.org/10.11646/zootaxa.4418.5.6

publication LSID

lsid:zoobank.org:pub:94F0E359-5CD8-4CE1-969D-9BC59BAA548D

persistent identifier

http://treatment.plazi.org/id/03D987B5-8977-FFD7-FF0A-68D0FD25000B

treatment provided by

Plazi

scientific name

Pasiphaea antea
status

n. sp.

PasIPHaea antea  n. sp.

( Figures 1–3View FIGURE 1View FIGURE 2View FIGURE 3)

Material examined: holotype: Abracos 2, station 47, Fernando de Noronha Archipelago (4° 25' 52'' S; 32°57' 51'' W), 30 April 2017, 1 ovigerous female (cl 42.69 mm), depth 505 m, MOUFPE-18449GoogleMaps  ; paratype: Abracos 2, station 53A, Rocas Atoll (3° 48' 59'' S; 33°59' 16'' W), 2 May 2017, 1 ovigerous female (cl 44.75 mm), depth 65 m, MOUFPE-18736.GoogleMaps 

Diagnosis (type series): body moderately firm ( Fig. 1View FIGURE 1). Rostrum slightly directed upward dorsally, apex sharp, reaching frontal margin; inferior margin slightly concave or straight ( Fig. 1View FIGURE 1, 2AView FIGURE 2). Carapace dorsal margin sharply carinate anteriorly to almost middle length ( Fig. 2BView FIGURE 2); carapace rounded posteriorly; branchial and suprabranchial carinae weakly developed; deep branchiostegal sinus; small branchiostegal spine, overreaching anterolateral margin ( Fig. 2AView FIGURE 2). First pereopod fingers shorter than palm; carpus with small distal spine; merus with 3–6 spines on ventral margin; ischium unarmed; basis with distal spine ( Fig. 3BView FIGURE 3). Second pereopod with fingers as long as palm; carpus with small distal spine; merus with 10–14 spines on ventral margin; ischium unarmed and basis with distal spine ( Fig. 3DView FIGURE 3). All abdominal somites without posterodorsal tooth ( Fig. 1View FIGURE 1, 2C –GView FIGURE 2). First abdominal somite dorsally carinate, except the anterior third ( Fig. 2CView FIGURE 2); second to fifth abdominal somites dorsally carinate ( Fig. 2D –FView FIGURE 2); sixth abdominal somite dorsally carinate, except posterior third ( Fig. 2GView FIGURE 2). Telson as long as sixth abdominal somite, shallowly grooved dorsally ( Fig. 2HView FIGURE 2); posterior margin slightly concave, distal spines missing, except for one stout outer spine and a pair of small median spines ( Fig. 2IView FIGURE 2).

Description: holotype, ovigerous female, cl 42.69 mm: body strongly compressed laterally; integument moderately firm ( Fig. 1View FIGURE 1). Rostrum short, slightly directed dorsally, sharp apex, reaching frontal margin; inferior margin concave ( Fig. 1View FIGURE 1, 2AView FIGURE 2). Carapace dorsal margin sharply carinate anteriorly to almost its middle length ( Fig. 2BView FIGURE 2); frontal margin slightly convex; branchial and suprabranchial carinae weakly developed; deep branchiostegal sinus; small branchiostegal spine, overreaching anterolateral margin ( Fig.1View FIGURE 1, 2AView FIGURE 2). Cornea darkly pigmented, wider than eyestalk ( Fig. 1View FIGURE 1).

Antennular peduncle moderately stout ( Fig. 1View FIGURE 1); stylocerite strongly compressed laterally with acute apex reaching first segment distal margin ( Fig. 1View FIGURE 1); third segment with small disto-lateral spine. Antennal peduncle basicerite with strong ventrolateral distal tooth; scaphocerite reaching the distal third of maxilliped propod-dactyl ( Fig. 1View FIGURE 1). Antennal scale overreaching thickened aesthetasc-bearing portion of outer antennular flagellum, 0.5 times as long as carapace, 5 times longer than wide, lateral margin evenly convex ( Fig. 2JView FIGURE 2).

Third maxilliped with long and slender exopod; palm-dactyl as long as ischio-merus ( Fig. 1View FIGURE 1, 3AView FIGURE 3).

First pereopod reaching the basal third of second pereopod palm; fingers curved distally, crossing, cutting edges finely pectinate. Palm 6 times longer than wide, with a row of 26 small spines on mesial face adjacent to flexor margin; merus with 3 spines on ventral margin; ischium unarmed; basis with ventro-distal spine; exopod reaching merus midlength ( Fig. 1View FIGURE 1, 3BView FIGURE 3). Chela bearing row of more than 8 spinules on mesial face ventrally, and more than 10 spinules extending from base of dactylus to proximal part of fixed finger ( Fig. 3CView FIGURE 3).

Second pereopod fingers as longer as palm, cutting edges finely pectinate; palm 10 times longer than wide; without spines; merus with 10 spines on ventral margin; ischium unarmed; basis with distal spine; exopod reaching basal third of merus ( Fig. 1View FIGURE 1, 3DView FIGURE 3).

Posterior three pairs of pereopods typical of genus. Third pereopod very slender, reaching distal third of second pereopod merus; exopod reaching merus midlength ( Fig. 1View FIGURE 1, 3EView FIGURE 3). Fourth pereopod the shortest one, reaching proximal third of third pereopod merus ( Fig. 1View FIGURE 1, 3FView FIGURE 3). Fifth pereopod reaching proximal third of third pereopod carpus ( Fig. 1View FIGURE 1, 3GView FIGURE 3).

All abdominal somites without posterodorsal tooth, dorsally carinate ( Fig. 2E –HView FIGURE 2). First abdominal somite dorsally carinate, except anterior third ( Fig. 2CView FIGURE 2). Sixth abdominal somite dorsally carinate, except posterior third ( Fig.2GView FIGURE 2). Sixth abdominal somite slightly longer than fifth, lateral ridge clearly discernible, acute; posterodorsal margin slightly convex ( Fig. 1View FIGURE 1, 3GView FIGURE 3).

Telson as long as sixth abdominal somite, shallowly grooved dorsally; slightly concave posterior margin, distal spines missing, except for one stout outer spine and a pair of small median spines ( Fig. 2H, IView FIGURE 2). Branchial formula, pleopods, uropods and mouthparts typical of genus.

Type locality: Fernando de Noronha Archipelago ( Brazil). 

Distribution: Fernando de Noronha Archipelago and Rocas Atoll ( Brazil).

Remarks: Hayashi (1999, 2004, 2006a, 2006b) recognized three informal species groups in Pasiphaea  , but the classification does not cover all species in the genus. The present new species is not referred to any of the three species groups proposed by Hayashi, as outlined below: in the Pasiphaea cristata  group ( Hayashi, 2004) the merus of the first pereopod is usually unarmed (or exceptionally bears 1–2 spines) while in Pasiphaea antea  n. sp. it bears 3–6 spines. In the P. alcocki  group ( Hayashi, 2006a) the posterior margin of telson is always deeply concave but it is slightly concave in P. antea  n. sp. In the Pasiphaea sivado  group ( Hayashi, 2006b) the carapace is usually not carinate dorsally, the abdominal somites 1–5 are not carinate dorsally and the 6th somite possesses a posterodorsal tooth, while in P. antea  n. sp. the carapace and abdominal somites 1–5 are carinate dorsally, and the posterodorsal tooth is absent in the 6th abdominal somite.

As pointed out by Komai et al. (2012), 19 species are not assigned to any of these groups. Pasiphaea antea  n. sp. is distinct from all of them, but appears closest to Pasiphaea dorsolineatus Komai & Chan, 2012  . Both species are characterized by the dorsally carinate, but unarmed first to sixth pleomeres and the the possession of a deep branchiostegal sinus on the carapace. Pasiphaea antea  n. sp. is distinguished from P. dorsolineatus  by several characters. The shape of the rostrum: inferior margin slightly concave and apex reaching frontal margin in Pasiphaea antea  n. sp. vs. inferior margin slightly convex and apex not reaching frontal process of carapace in P.

dorsolineatus  ; the number of spines on the merus of the first pereopod is 3–6 in Pasiphaea antea  n. sp. vs. 1–2 in P. dorsolineatus  ; the number of spines on the merus of the second pereopod is 10–14 in Pasiphaea antea  n. sp. vs. 7 in P. dorsolineatus  ; the carapace branchial and suprabranchial carinae are present in Pasiphaea antea  n. sp. vs. only the branchial carina is present in P. dorsolineatus  . Carinaton of the dorsal midline of the carapace also seems to be different between the two.

Pasiphaea antea  n. sp. seems also to be close to Pasiphaea westindica Tchesunov, 1984  , described from the Caribbean Sea, and to Pasiphaea levicarinata Hanamura, 1994  , from the northwestern Australia. The three species present carinate abdominal somites 2–6 and slightly concave posterior margin of the telson.

The new species described herein differs from P. westindica  by the carapace dorsal margin sharply carinate anteriorly in P. antea  n. sp. vs. weakly sinuous in P. westindica  ; the number of spines on the merus of the first pereopod, 3–6 in P. antea  n. sp. vs. 3 in P. westindica  and the number of spines on the merus of the second pereopod, 10–14 in P. antea  n. sp. vs. 7 or 8 in P. westindica  .

Pasiphaea antea  n. sp. is easily distinguished from P. levicarinata  by the: rostrum always reaching frontal margin vs. not reaching in P. levicarinata  ; the number of spines on the merus of the first pereopod, 3–6 in P. antea  n. sp. vs. 5–15 in P. levicarinata  and by the number of spines on the merus of the second pereopod, 10–14 in P. antea  n. sp. vs. 19–30 in P. levicarinata  .

Etymology: Specific epithet corresponds to the name of the research vessel, "Antea", used for collecting the new species along the northwestern Brazilian coast.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Pasiphaeidae

Genus

Pasiphaea

Loc

Pasiphaea antea

Rodrigues, Thaiana G. A., Alves-Júnior, Flavio A. & Cardoso, Irene A. 2018
2018
Loc

Pasiphaea antea

Rodrigues & Alves-Júnior & Cardoso 2018
2018
Loc

P. antea

Rodrigues & Alves-Júnior & Cardoso 2018
2018
Loc

P. antea

Rodrigues & Alves-Júnior & Cardoso 2018
2018
Loc

P. antea

Rodrigues & Alves-Júnior & Cardoso 2018
2018
Loc

Pasiphaea levicarinata

Hanamura 1994
1994
Loc

Pasiphaea westindica

Tchesunov 1984
1984
Loc

P. westindica

Tchesunov 1984
1984
Loc

P. westindica

Tchesunov 1984
1984
Loc

P. westindica

Tchesunov 1984
1984
Loc

P. westindica

Tchesunov 1984
1984