Abstract
Two species of the family Talitridae Rafinesque, 1815 are described from English Point Beach, Mkomani, Mombasa, Kenya. One new species Floresorchestia mkomani Bichang’a & Hou, sp. nov. is reported and Gazia gazi Lowry & Springthorpe, 2019 is redescribed. The new species is characterized by the five dentate lacinia mobilis on the left mandible in male and only four in female, pereopod IV dactylus thickened proximally and having a small protrusion towards the mid of its posterior margin, a sexually dimorphic pereopod VII, and the presence of vertical slits just above the ventral margin of epimera II and III. Detailed morphological characteristics, as well as comparisons with closely related species are provided. To ascertain the species delimitation, molecular evidence is availed in this paper. Type material is deposited in National Museums of Kenya (NMK).
References
Azman, B.A.R., Wongkamhaeng, K. & Dumrongrojwattana, P. (2014) Description of Floresorchestia samroiyodensis, a new species of landhopper (Crustacea, Amphipoda, Talitridae) from Thailand. Zoosystematics and Evolution, 90 (1), 7–19.
https://doi.org/10.3897/zse.90.7085Barnard, J.L. (1961) Gammaridean Amphipoda from depths of 400-6000 meters. Galathea Report, 5, 23–128.
Beermann, J., Westbury, M.V., Hofreiter, M., Hilgers, L., Deister, F., Neumann, H. & Raupach, M.J. (2018) Cryptic species in a well-known habitat: applying taxonomics to the amphipod genus Epimeria (Crustacea, Peracarida). Scientific Reports, 8, 6893.
https://doi.org/10.1038/s41598-018-25225-x
Bousfield, E.L. (1984) Recent Advances in the Systematics and Biogeography of Landhoppers (Amphipoda: Talitridae) of the Indo-Pacific Region. In: Radovsky, F.J., Raven, P.H. & Sohmer, S.H. (Eds.), Biogeography of the Tropical Pacific. Association of Systematics Collections and the Bernice P. Bishop Museum as Bishop Museum Special Publication, 72, pp. 171–210.
Cheng, Y.-T., Nakazono, K., Lin, Y.K. & Chan, B.K.K. (2011) Cryptic diversity of the semi-terrestrial amphipod Platorchestia japonica (Tattersall, 1922) (Amphipoda: Talitrida: Talitridae) in Japan and Taiwan, with description of a new species. Zootaxa, 2787 (1), 1–18.
https://doi.org/10.11646/zootaxa.2787.1.1
Chevreux, E. (1901) Crustacés Amphipodes. Mission scientifique de M. Ch. Alluaud aux Iles Séchelles (Mars, Avril, Mai 1892). Mémoires de La Société zoologique de France, 14, 388–438.
Ciavatti, G. (1989) Les Talitres (Crustacea. Amphipoda) des plages de la Guadeloupe. Description de deux espèces nouvelles. Annales de l’Institut Océanographique, 65, 127–146.
Dayrat, B. (2005) Towards integrative taxonomy: integrative taxonomy. Biological Journal of the Linnean Society, 85, 407–415.
https://doi.org/10.1111/j.1095-8312.2005.00503.x
Folmer, O., Black, M., Hoeh, W., Lutz, R. & Vrijenhoek, R. (1994) DNA primers for amplification of mitochondrial cytochrome c oxidase subunit I from diverse metazoan invertebrates. Molecular Marine Biology and Biotechnology, 3, 294–299.
Horton, T., Lowry, J., De Broyer, C., Bellan-Santini, D., Coleman, C.O., Corbari, L., Costello, M.J., Daneliya, M., Dauvin, J.-C., Fišer, C., Gasca, R., Grabowski, M., Guerra-García, J.M., Hendrycks, E., Hughes, L., Jaume, D., Jazdzewski, K., Kim, Y.-H., King, R., Krapp-Schickel, T., LeCroy, S., Lörz, A.-N., Mamos, T., Senna, A.R., Serejo, C., Sket, B., Souza-Filho, J.F., Tandberg, A.H., Thomas, J.D., Thurston, M., Vader, W., Väinölä, R., Vonk, R., White, K. & Zeidler, W. (2019) World Amphipoda Database. Available from: http://www.marinespecies.org/amphipoda (accessed 22 December 2020)
Hou, Z., Fu, J. & Li, S. (2007) A molecular phylogeny of the genus Gammarus (Crustacea: Amphipoda) based on mitochondrial and nuclear gene sequences. Molecular Phylogenetics and Evolution, 45, 596–611.
https://doi.org/10.1016/j.ympev.2007.06.006
Hou, Z. & Li, S. (2010) Intraspecific or interspecific variation: delimitation of species boundaries within the genus Gammarus (Crustacea, Amphipoda, Gammaridae), with description of four new species: delimitation of Gammarus species boundaries. Zoological Journal of the Linnean Society, 160, 215–253.
https://doi.org/10.1111/j.1096-3642.2009.00603.x
Hou, Z. & Zhao, S. (2017) A new terrestrial talitrid genus, Myanmarorchestia, with two new species from Myanmar (Crustacea, Amphipoda, Talitridae). ZooKeys, 705, 15–39.
https://doi.org/10.3897/zookeys.705.15045
Kumar, S., Stecher, G., Li, M., Knyaz, C. & Tamura, K. (2018) MEGA X: Molecular Evolutionary Genetics Analysis across Computing Platforms. In: Battistuzzi, F.U. (Ed.), Molecular Biology and Evolution, 35, pp. 1547–1549.
https://doi.org/10.1093/molbev/msy096
Lefébure, T., Douady, C.J., Gouy, M. & Gibert, J. (2006) Relationship between morphological taxonomy and molecular divergence within Crustacea: Proposal of a molecular threshold to help species delimitation. Molecular Phylogenetics and Evolution, 40, 435–447.
https://doi.org/10.1016/j.ympev.2006.03.014
Lowry, J.K. & Myers, A.A. (2013) A Phylogeny and Classification of the Senticaudata subord. nov. Crustacea: Amphipoda). Zootaxa, 3610 (1), 1–80. https://doi.org/10.11646/zootaxa.3610.1.1
Lowry, J.K. & Springthorpe, R.T. (2015) The tropical talitrid genus Floresorchestia (Crustacea, Amphipoda, Talitridae). Zootaxa, 3935, 1–68.
https://doi.org/10.11646/zootaxa.3935.1.1
Lowry, J.K. & Springthorpe, R.T. (2019) Talitrid amphipods from India, East Africa and the Red Sea (Amphipoda, Senticaudata, Talitroidea, Talitridae). Zootaxa, 4638 (3), 351–378.
https://doi.org/10.11646/zootaxa.4638.3.3
Moore, P.G. (1986) A new species in the genus Grandidierella Coutiere (Crustacea: Amphipoda) from an Australia solar salt-works. Journal of Natural History, 20, 1393–1399.
https://doi.org/10.1080/00222938600770931
Morino, H. & Miyamoto, H. (2008) Taxonomic Studies on the Talitridae (Amphipoda) from Taiwan, III. The Genus Floresorchestia Bousfield, 1984. Crustaceana, 81, 837–860.
https://doi.org/10.1163/156854008784771667
Myers, A.A. (1974) A new species of commensal amphipod from East Africa. Crustaceana 26, 33–36.
https://doi.org/10.1163/156854074X00046
Myers, A.A. (1975) Studies on the genus Lembos Bate. III. Indo-Pacific species: L. kidoli sp. nov., L. ruffoi sp. nov., L. excavatus sp. nov., L. leptocheirus Walker. Bolletino del Museo Civico di Storia Naturale di Verona, 2, 13–50, figs. 61–89.
Myers, A.A. & Lowry, J.K. (2020) A phylogeny and classification of the Talitroidea (Amphipoda, Senticaudata) based on interpretation of morphological synapomorphies and homoplasies. Zootaxa, 4778 (2), 281–310.
https://doi.org/10.11646/zootaxa.4778.2.3
Orr, M.C., Ferrari, R.R., Hughes, A.C., Chen, J., Ascher, J.S., Yan, Y.-H., Williams, P.H., Zhou, X., Bai, M., Rudoy, A., Zhang, F., Ma, K.-P. & Zhu, C.-D. (2020) Taxonomy must engage with new technologies and evolve to face future challenges. Nature Ecology & Evolution. [published online]
https://doi.org/10.1038/s41559-020-01360-5
Padial, J.M., Miralles, A., De la Riva, I. & Vences, M. (2010) The integrative future of taxonomy. Frontiers in Zoology, 7, 16.
https://doi.org/10.1186/1742-9994-7-16
Podlesińska, W. & Dąbrowska, H. (2019) Amphipods in estuarine and marine quality assessment—a review. Oceanologia, 61, 179–196.
https://doi.org/10.1016/j.oceano.2018.09.002
Rafinesque, C.S. (1815) Analyse de la nature: or, Tableau de l’univers et des corps organisés. Aux dépens de l’auteur, Palerme, 224 pp.
https://doi.org/10.5962/bhl.title.106607
Serejo, C.S. (2004) Cladistic revision of talitroidean amphipods (Crustacea, Gammaridea), with a proposal of a new classification. Zoologica Scripta 33, 551–586.
https://doi.org/10.1111/j.0300-3256.2004.00163.x
UNESCO (2011) Whc-11/35.Com/20/35 Com 7C.5. Decisions adopted by the World Heritage Committee at its 35th session in Paris.194–196pp.
Watling, L. (1989) A classification system for crustacean setae based on the homology concept. In: Felgenhauer, A., Thistle, B. & Watling, L. (Eds.), Functional Morphology of Feeding and Grooming in Crustacea. CRC Press, Rotterdam u.a, pp. 15–26.
https://doi.org/10.1201/9781003079354-2
Weeks, J.M. & Rainbow, P.S. (1993) The relative importance of food and seawater as sources of copper and zinc to talitrid amphipods (Crustacea; Amphipoda; Talitridae). The Journal of Applied Ecology 30, 722.
https://doi.org/10.2307/2404250
Wongkamhaeng, K., Dumrongrojwattana, P. & Saengsakda Pattaratumrong, M. (2016) Two new species of Floresorchestia (Crustacea, Amphipoda, Talitridae) in Thailand. ZooKeys 635, 31–51.
https://doi.org/10.3897/zookeys.635.10454