Mariaplax galaxeae, Rahayu & Ng, 2014
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publication ID |
https://doi.org/ 10.5281/zenodo.5353945 |
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publication LSID |
lsid:zoobank.org:pub:4CF42744-861A-4635-9703-E6639CEBFAA9 |
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persistent identifier |
https://treatment.plazi.org/id/9646E4A1-75D2-44AD-9B7E-1DD901D6FAF3 |
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taxon LSID |
lsid:zoobank.org:act:9646E4A1-75D2-44AD-9B7E-1DD901D6FAF3 |
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treatment provided by |
Tatiana |
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scientific name |
Mariaplax galaxeae |
| status |
sp. nov. |
Mariaplax galaxeae View in CoL , new species
( Figs. 1G View Fig , 32 View Fig , 33 View Fig )
Material examined. Holotype: female (4.2 × 3.2 mm) ( ZRC 2013.1690 View Materials ), station TB99, Singapore Strait , 1°18'861N 104°05'128, 33.7–36.7 m, Singapore, coll. RV Galaxea , 28 May 2013.
Diagnosis. Carapace subquadrate, about 1.4 times as broad as long; dorsal surface covered by tubercles; regions indistinct ( Figs. 32A View Fig ). Anterolateral margin arcuate; posterolateral corner with slight protuberance angle over base of posterior pereopods. Eye small, slightly movable, cornea globular ( Fig. 32C View Fig ). Pterygostomial region with row of long and short striae with scattered tubercles. Third maxillipeds relatively broad, almost completely covering buccal cavity ( Figs. 32C View Fig , 33B View Fig ); ischium of third maxillipeds longer than merus, with straight margin; combined length of dactylus, propodus and carpus slightly shorter than that of merus and ischium; exopod narrow, 0.3 times width of ischium, flagellum well developed. Chelipeds stout, unequal, covered by tubercles ( Fig. 32B, C View Fig ); major chela with gap when fingers closed, large teeth on cutting edges; dactylus with shallow groove on outer surface, palm slightly wider than long; minor chela with narrow gap between closed fingers, smaller teeth on cutting edges; dactylus with shallow longitudinal groove medially. P2–P4 relatively long ( Fig. 32A View Fig ), long setae on anterior and posterior margin of dactylus, propodus, short setae on carpus and merus; merus of P4 about 2.6 times as long as broad, longitudinal groove on outer face; dactylus of P2 and P4 slightly upcurved, dactylus of P3 straight. Female thoracic sternum broad ( Fig. 32B View Fig ), covered by tubercles; sternites 1 and 2 fused, separated from sternite 3 by distinct ridge; sternite 3 and 4 fused, abdominal cavity reached distal margin of sternite 3. Female abdomen relatively broad ( Figs. 32B View Fig , 33C View Fig ); all somites and telson free; somite 6 slightly longer than telson; telson with rounded tip, margin with sparse setae. Male unknown.
Colour. Carapace cream, mottled light and dark brown; chelipeds and P2−P4 light brown ( Fig. 1G View Fig ).
Etymology. Named after the Tropical Marine Science Institute research vessel “ Galaxea ”, which was used during Singapore Strait Expedition of the Comprehensive Marine Biodiversity Survey for collecting material.
Remarks. Mariaplax galaxeae , new species, resembles M. cyrtophallus , new species, and M. mica , new species, in having the carapace, chelipeds and P2–P4 strongly tuberculated. Differences can be seen in the shape of the third maxillipeds and the propotion of width to length of the carapace. In M. galaxeae , the mesial and lateral margins along the distal three quarterof the ischium of the third maxilliped are parallel, straight, the narrow proximal part relatively short ( Fig. 33B View Fig ), while in M. cyrtophallus and M. mica , the mesial margin is oblique with slightly expanded subproximally, the narrow proximal part short ( Fig. 29E View Fig and Fig. 38B View Fig , respectively). The carapace of M. galaxeae is visibly more quadrangular with 1.4 times as broad as long compared to 1.5 as broad as long in M. cyrtophallus and M. mica . Furthermore, the pereopods are shorter in M. galaxeae , which has the merus of P4 2.6 as long as broad whereas in M. cyrtophallus and M. mica it is 3.4 and 3.6 times s long as broad respectively.
The shape of the third maxilliped is comparable to that of M. anfracta , but the narrow proximal part of the ischium is even shorter in M. anfracta ( Fig. 33B View Fig versus Fig. 23D View Fig ). The abdomen of the same size female is also relatively broader in M. anfracta ( Fig. 23H View Fig ) compare to M. galaxeae ( Fig. 33C View Fig ).
Type locality. Singapore Strait, Singapore.
Distribution. Singapore Strait, Singapore. Subtidal, 33– 36 m.
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.