Selwynia madang

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Ng, Peter K. L., Rahayu, Dwi Listyo (2016) On the genera Selwynia Borradaile, 1903, and Gandoa Kammerer, 2006, with descriptions of two new species from Papua New Guinea and French Polynesia (Crustacea: Decapoda: Brachyura: Aphanodactylidae). Zootaxa 4092 : 352 – 358, doi. Versioned wiki page: 2016-03-17, version 78235, https://species-id.net/w/index.php?title=Selwynia_madang&oldid=78235 , contributors (alphabetical order): PlaziBot.

Citation formats to copy and paste

BibTeX:

@article{Ng2016Zootaxa4092,
author = {Ng, Peter K. L. AND Rahayu, Dwi Listyo},
journal = {Zootaxa},
title = {On the genera Selwynia Borradaile, 1903, and Gandoa Kammerer, 2006, with descriptions of two new species from Papua New Guinea and French Polynesia (Crustacea: Decapoda: Brachyura: Aphanodactylidae)},
year = {2016},
volume = {4092},
issue = {},
pages = {352 -- 358},
doi = {TODO},
url = {},
note = {Versioned wiki page: 2016-03-17, version 78235, https://species-id.net/w/index.php?title=Selwynia_madang&oldid=78235 , contributors (alphabetical order): PlaziBot.}

}

RIS/ Endnote:

TY - JOUR
T1 - On the genera Selwynia Borradaile, 1903, and Gandoa Kammerer, 2006, with descriptions of two new species from Papua New Guinea and French Polynesia (Crustacea: Decapoda: Brachyura: Aphanodactylidae)
A1 - Ng, Peter K. L.
A1 - Rahayu, Dwi Listyo
Y1 - 2016
JF - Zootaxa
JA -
VL - 4092
IS -
UR - http://dx.doi.org/TODO
SP - 352
EP - 358
PB -
M1 - Versioned wiki page: 2016-03-17, version 78235, https://species-id.net/w/index.php?title=Selwynia_madang&oldid=78235 , contributors (alphabetical order): PlaziBot.

M3 - doi:TODO

Wikipedia/ Citizendium:

<ref name="Ng2016Zootaxa4092">{{Citation
| author = Ng, Peter K. L., Rahayu, Dwi Listyo
| title = On the genera Selwynia Borradaile, 1903, and Gandoa Kammerer, 2006, with descriptions of two new species from Papua New Guinea and French Polynesia (Crustacea: Decapoda: Brachyura: Aphanodactylidae)
| journal = Zootaxa
| year = 2016
| volume = 4092
| issue =
| pages = 352 -- 358
| pmid =
| publisher =
| doi = TODO
| url =
| pmc =
| accessdate = 2020-11-24

}} Versioned wiki page: 2016-03-17, version 78235, https://species-id.net/w/index.php?title=Selwynia_madang&oldid=78235 , contributors (alphabetical order): PlaziBot.</ref>


Taxonavigation

Ordo: Decapoda
Familia: Pilumnidae
Genus: Selwynia

Name

Selwynia madang Ng, Peter K. L., 2016Wikispecies linkPensoft Profile

  • Selwynia madang Ng, Peter K. L., 2016, Zootaxa 4092: 352-358.

Materials Examined

Material examined. Holotype: ovigerous female (12.1 × 7.5 mm) (MNHN IU- 2013 - 1428 a), stn. PR 142, west of Kranket Island, Madang, 05º 11.8 ’S145 º 49.2 ’E, 2–18 m, in terebellid worm tube (Loimia sp.), northeastern Papua New Guinea, coll. Expédition PAPUA NIUGINI, 30 November 2012. Paratypes: 1 male (8.2 × 5.4 mm) (MNHN IU- 2013 - 1428 b), same locality as holotype; 1 male (9.4 × 6.9 mm), 1 female (13.1 × 7.7 mm) (ZRC 2015.279), stn. PR 186, west of Kranket Island, Madang, 05º 11.3 ’S145 º 49.5 ’E, 1–20 m, in terebellid worm tube, northeastern Papua New Guinea, coll. Expédition PAPUA NIUGINI, 5 December 2012.

Description

Description (female holotype). Carapace (Fig. 8 A) oval, about 1.7 broader than long; dorsal surface smooth, region poorly demarcated, flattened to gently concave on mesogastric region, shallow, indiscernible pit on each hepatic region. Front (Fig. 8 C) deflexed, medially concave in dorsal view. Orbital margin (Fig. 8 C) entire, slightly narrower distally, without gap between cornea, external orbital angle. Anterolateral margin entire, convex laterally, not cristate, continuous with posterolateral margin. Epistome very short, medially sunken. Antennule folding transversely in fossa. Antenna with stout basal antennal article, not reaching distolateral angle of carapace; flagellum enters orbit. Ocular peduncles (Fig. 8 C) movable, short, stout, subconical, cornea small, well pigmented. Third maxillipeds (Fig. 8 C) covering approximately three-quarters of buccal cavern when closed; ischium slightly longer, broader than merus; palp attached to distolateral angle of merus; exopod slender, tapering distally, reaching two-third length of merus; flagellum long. Thoracic sternites 1, 2 fused, 2 /3, 3/ 4 each demarcated by shallow ridge; sternites 4–8 laterally demarcated by shallow sutures, each medially interrupted; sutures between sternites 4 /5, 6/ 7 longer than others; vulva small, ovate, situated on distal two-thirds of sternite 6. Chelipeds (Fig. 8 C) equal. Merus triangular in cross section, dorsal margin rugose, dorsal margin, outer surface setose. Carpus smooth, inner angle absent. Chela with smooth surfaces, palm slightly longer than dactylus; immovable finger with weakly sinuous cutting edge, cutting edge convex medially, lined with small teeth; movable finger with cutting edge concave on distal half.



Ambulatory legs (P 2 –P 5) (Figs. 8 A, 12 G, H) relatively short; P 3 longest, P 5 shortest, setose on extensor, flexor margins; outer surface propodus, carpus with scattered short setae. Merus as long as or slightly longer than combined length of respective propodus, dactylus, extensor margin unarmed, flexor margin armature of P 2 –P 5 as follows: P 2 1 + 1-2 / 1 + 1-2, P 3 1 + 3 / 1 + 3, P 4 1 + 2-3 / 1 + 3, P 5 0+0/0+ 0-1. Flexor margin of basis-ischium of P 5 with distinct denticle. Dactylus very short, claw-like. Abdomen (Figs. 8 B, 12 F) with all somites, telson distinct, mobile; somites wide. Description (male paratype). Carapace (Fig. 9 A) oval, about 1.4 broader than long; dorsal surface smooth, region poorly demarcated, flattened to gently concave on mesogastric region, shallow depression on each hepatic region. Front (Fig. 9 C) deflexed, medially concave in dorsal view. Orbital margin (Fig. 9 C) entire, slightly narrower distally. Anterolateral margin entire, convex laterally, not cristate, continuous with posterolateral margin. Epistome very short, medially sunken. Antennule folding transversely in fossa. Antenna with stout basal antennal article, not reaching distolateral angle of carapace; antenna enters orbit. Ocular peduncles (Fig. 9 C) movable, stout, subconical, cornea slightly protruding beyond orbit, small, well pigmented. Third maxillipeds (Figs. 9 B, 12 A) covering approximately three-quarters of buccal cavern when closed; ischium slightly longer, broader than merus; palp attached to distolateral angle of merus; exopod slender, tapering distally, reaching two-thirds length of merus; flagellum long. Thoracic sternites 1, 2 fused, 2 /3, 3/ 4 each demarcated by shallow ridge; sternites 4–8 laterally demarcated by shallow sutures, each medially interrupted; sutures between sternites 4 /5, 6/ 7 longer than others, vulva on distal two-thirds of sternite 5, between mesial ends of suture 5 /6, 6/ 7. Chelipeds (Fig. 9 C) as in female. Ambulatory legs (P 2 –P 5) (Figs. 9 A, 12 C) relatively short, P 3 longest, P 5 shortest, setose on extensor, flexor margins; outer surface propodus, carpus with short setae. Merus as long as or slightly longer than combined length of respective propodus, dactylus, flexor margin armature of P 2 –P 5 as follows: P 2 0+ 3 /0+ 1-2, P 3 0+ 3-4 /0+ 3-4, P 4 0+ 3-4 /0+ 3-4, P 5 0+0/0+0. Flexor margin of basis-ischium of P 5 unarmed. Dactylus very short, claw-like. Abdomen (Figs. 9 B, 12 B) relatively wide, all somites, telson distinct, mobile, somite 1 widest. G 1 (Fig. 12 D, E) slender, simple, slightly curved distally, slightly tapering at tip. Colour. Males and females were dirty white in life, with the carapace of the females appearing yellowishorange because of the underlying organs (Figs. 10, 11). The legs and sides of the carapace are lined with light brown setae, and the corneas are orange-yellow (Figs. 9, 10). The specimens are often covered with brown dirt from the worm tube (Figs. 10 A, 11 A).

Discussion

Remarks. Selwynia madang n. sp., can be separated from all congeners by the shape of the third maxilliped. The merus of the third maxilliped of S. madang n. sp., is only slightly shorter or almost the same length (Fig. 12 A) while in other species the merus is clearly shorter than ischium (Figs. 4 A, 7 A, 16 A). Like S. sibogae, the flexor margin of the P 2 –P 4 merus of S. madang n. sp., is armed with 1–4 teeth (Fig. 12 C, G). Compared to S. sibogae, S. madang n. sp., can also be distinguished by its relatively more slender G 1 structure (Fig. 12 D, E) (distinctly stouter in S. sibogae; Fig. 4 D, E).

Biology and Ecology

Biology. The specimens were all collected from a large terebellid polychaete worm which is provisionally identified as a species of Loimia (Fig. 11). One pair of worms were found in each tube (A. Anker, pers. comm.).

Distribution

Distribution. Known only from eastern Papua New Guinea.

Taxon Treatment

  • Ng, Peter K. L.; Rahayu, Dwi Listyo; 2016: On the genera Selwynia Borradaile, 1903, and Gandoa Kammerer, 2006, with descriptions of two new species from Papua New Guinea and French Polynesia (Crustacea: Decapoda: Brachyura: Aphanodactylidae), Zootaxa 4092: 352-358. doi
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No known copyright restrictions apply on this formal expression of scientific knowledge. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for details.