Carcinoplax longimanus (De Haan, 1833 )

Muñoz, Isabel, García-Isarch, Eva & Cuesta, Jose A., 2021, Annotated and updated checklist of marine crabs (Decapoda: Brachyura) of Mozambique supported by morphological and molecular data from shelf and slope species of the “ MOZAMBIQUE ” surveys, Zootaxa 5056 (1), pp. 1-67 : 25-26

publication ID	https://doi.org/10.11646/zootaxa.5056.1.1
publication LSID	lsid:zoobank.org:pub:D20A249C-1CA4-45F8-8677-D2011A8380A4
DOI	https://doi.org/10.5281/zenodo.5592503
persistent identifier	https://treatment.plazi.org/id/03D487F8-213C-FFF8-FF71-D96FBF35FBDC
treatment provided by	Plazi (2021-10-19 07:27:05, last updated 2024-11-25 18:47:24)
scientific name	Carcinoplax longimanus (De Haan, 1833 )
status

Treatment

Carcinoplax longimanus (De Haan, 1833) View in CoL

( Figure 8D,E View FIGURE 8 )

Material examined. M07, Stn. 106, 259m, ♀ 54.3×43.9 (IEO-CD-MZ07/1919); M08, Stn. 68, 244m, ♂ 59.2× 48mm; ♂ 58.5× 46.5mm; ♂ 66× 52.4mm; ♂ 55.2× 44.1mm (IEO-CD-MZ08/1787); M08, Stn. 69, 277m, ♀ 44.2× 36.6mm; ♂ 65.4× 51.2mm; ♂ 67.5× 52.6mm; ♂ 52× 42mm; ♂ 49.2× 49mm; ♂ 54.8× 45.7mm; ♂ 50× 41.1mm (IEO-CD-MZ08/1786); M08, Stn. 74, 336m, ♀ 52.4× 41.2mm (IEO-CD-MZ08/1851), 16S ( MZ 424935 View Materials ) , COI ( MZ 434781 View Materials ) ; M08, Stn. 75, 256m, ♀ 51.2× 41.2mm, ♀ 50.6× 40.9mm (IEO-CD-MZ08/1826); M09, Stn. 83, 299m, ♂ 62× 47.7mm (IEO-CD-MZ09/1828); M09, Stn. 84, 254m, ♀ 51.2× 41.4mm (IEO-CD-MZ09/1829-1), COI ( MZ 434782 View Materials ) , ♂ 24.2× 18.1mm, ♂ 50.66× 40.2mm (IEO-CD-MZ09/1829-2), 16S ( MZ 424936 View Materials ) , COI ( MZ 434783 View Materials ) .

Habitat and distribution. Wide distribution from South and East Africa to the western Pacific Ocean ( Korea and Japan to Indonesia) from 6 to 377m depth ( Castro 2013). In waters of Mozambique, it was cited between 66–377m ( Emmerson 2016c) and between 80 and 120m ( Sasaki 2019). It is a very abundant species in a wide depth range and quite common in the bycatch of shrimper trawl fisheries ( Oh et al. 2009; Sobrino et al. pers. comm.). They are benthic crabs, which inhabits mud or sand bottoms where they build burrows ( Castro 2007; Hsueh & Hung 2009; Kensley 1981; Ng 1998).

Results and remarks. Our specimens agree well with the descriptions and figures by Castro (2007). We checked 19 specimens of C. longimanus View in CoL collected in M07, M08 and M09 surveys, at depths between 244 and 336m.

There is great size-related morphometric variability in this species. The antero-lateral teeth are polished over time and become smaller in relation to the specimen size with growing, in a way that the carapace edge seems to be unarmed in the biggest individuals. Moreover, there is also a certain sexual dimorphism, as the females and juvenile males have short chelipeds, while the chelipeds are exceptionally long in adult males (see Figure 8D View FIGURE 8 ), the merus and propodus being almost three times longer than in juveniles and females while the carpus remains practically the same length (see Figure 8E View FIGURE 8 ). These features were also illustrated by Yamashita (1965), Guinot (1989) and Ikeda (1998).

Colouration observed. Specimens looked polished, the carapace being orange-brown, the chelipeds bright orange with the fingers, the spines and the knobs at the beginning of the propodus, bright white. The pereiopods were orange with the junction between merus-carpus and carpus-propodus white. Dactyli were brown, partly due to their dense tomentum. After preservation in ethanol or formalin, females and juveniles acquire a uniform bone colour, while the carapace of big males turns to brown.

DNA barcode. The two 16S sequences obtained for specimens from M08 and M09 fit 100% with an incomplete sequence of C. longimanus of 406 bp (hypervariable parts deleted) from Taiwan (?) ( NTOU B00091, Genbank code KJ132525 View Materials ) included in the study by Tsang et al. (2014). Respect to COI sequences, each specimen presents a different haplotype (differing in just one mutation). These sequences show a similarity between 98.89 and 99.21% with three unpublished (private) sequences of specimens of Carcinoplax longimanus (as C. longimana ) from South Korea deposited in BOLD. However, they present a similarity of 84.4% with C. ischurodous (99 mutations) that underline the above-mentioned differences of this species with congeneric ones, supporting the possibility of a different genus for C. ischurodous .

References

Castro, P. (2007) A reappraisal of the family Goneplacidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) and revision of the subfamily Goneplacinae, with the description of 10 new genera and 18 new species. Zoosystema, 29 (4), 609 - 774.

Castro, P. (2013) Brachyuran crabs (Crustacea, Brachyura: Crossotonotidae, Ethusidae, Euryplacidae, Goneplacidae, Latreilliidae, Palicidae, Tetraliidae, Trapeziidae) of the MAINBAZA, MIRIKI, and ATIMO VATAE expeditions to the Mozambique Channel and Madagascar. In: Ahyong, S. T., Chan, T. - Y., Corbari, L. & Ng, P. K. L. (Eds.), Tropical Deep- Sea Benthos. Vol. 27. Memoires du Museum national d'Histoire naturelle (1993). Vol. 204. Publications Scientifiques du Museum Paris, Paris, pp. 437 - 466.

Emmerson, W. D. (2016 c). A guide to, and checklist for, the Decapoda of Namibia, South Africa and Mozambique. Vol. 3. Cambridge Scholars Publishing, Newcastle upon Tyne, 711 pp.

Guinot, D. (1989) Le genre Carcinoplax H. Milne Edwards, 1852 (Crustacea, Brachyura: Goneplacidae). In: Forest, J. (Ed.), Resultats des campagnes MUSORSTOM. Vol. 5. Memoires du Museum national d'Histoire naturelle. Serie A. Vol. 144. Publications Scientifiques du Museum Paris, Paris, pp. 265 - 345.

Haan, W. de (1833 - 1850) Crustacea. In: von Siebold, P. F. (Ed.). Fauna Japonica sive Descriptio Animalium, quae in Itinere per Japoniam, Jussu et Auspiciis Superiorum, qui Summum in India Batava Imperium Tenent, Suscepto, Annis 1823 - 1830 Collegit, Noitis, Observationibus et Adumbrationibus Illustravit. Lugduni-Batavorum, Leiden, pp. 1 - 243.

Kensley, B. (1981) On the zoogeography of southern African Decapod Crustacea, with a distributional checklist of the species. Smithsonian Contributions to Zoology, 338, 1 - 64.

Ng, P. K. L. (1998) Crabs. In: Carpenter, K. E. & Niem, V. H. (Eds.), Cephalopods, Crustaceans, Holothurians and Sharks. The Living Marine Resources of the Western Central Pacific. Vol. 2. FAO species identification guide for Fishery Purposes. FAO, Rome, pp. 1045 - 1155.

Oh, Ch. - W., Kim, S. T., & Na, J. - H. (2009) Variations in species composition, biomass, and density in shrimp trawl bycatch across seasons and tidal phases in Southern Korean waters: Developing a fisheries risk management approach. Fisheries and Aquatic Sciences, 12 (2), 138 - 151. https: // doi. org / 10.5657 / FAS. 2009.12.2.138

Sasaki, J. (2019) The species list of Decapoda, Euphausiacea, and Stomatopoda, all of the world. Version 03 - 3.1. Local Independent Administrative Agency Hokkaido Research Organization, Resources Management and Enhancement Division, Abashiri Fisheries Research Institute, Fisheries Research Department, Hokkaido, 14644 pp. https: // doi. org / 10.13140 / RG. 2.2.22353.89446

Tsang, L. M., Schubart, C. D., Ahyong, S. T., Lai, J. C. Y., Au, E. Y. C., Chan, T. - Y., Ng, P. K. L. & Chu, K. H. (2014) Evolutionary history of true crabs (Crustacea: Decapoda: Brachyura) and the origin of freshwater crabs. Molecular Biology and Evolution, 31, 1173 - 1187. https: // doi. org / 10.1093 / molbev / msu 068

Yamashita H. (1965) On the growth of the cheliped of Carcinoplax longimanus (de Haan). Researches on Crustacea, Tokyo, 2, 10 - 18. [in Japanese with English summary] https: // doi. org / 10.18353 / rcustacea. 2.0 _ 10

Figures

FIGURE 8. A, Platepistoma guezei, ♀ IEO-CD-MOZ07/279; B, Dairoides margaritatus, ♀ IEO-CD-MZ07/1911 (preserved); C, Carcinoplax ischurodous, ♂ IEO-CD-MZ08/1824; D, Carcinoplax longimanus, ♂ IEO-CD-MZ08/1787; E, Carcinoplax longimanus, ♀ IEO-CD-MZ08/1851; F, Tanaoa pustulosus, ♀ IEO-CD-MZ08/1776; G, Euclosiana exquisita, ♀ IEO-CD- MZ08/1757. Scale bars: 1cm.