Rapimenes
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Ďuriš2017ZooKeys, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Ďuriš2017ZooKeys">{{Citation See also the citation download page at the journal. |
Ordo: Decapoda
Familia: Palaemonidae
Name
Rapimenes Ďuriš & Horká, 2017 gen. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type species
Periclimenes granulimanus Bruce, 1978, by present designation.
Included species
Rapimenes brucei (Ďuriš, 1990), comb. n.; Rapimenes granulimanus (Bruce, 1978), comb. n. (Fig. 3H); and Rapimenes laevimanus (Ďuriš, 2010), comb. n. (Fig. 3G).
Material examined
In addition to the type series (Ďuriš 2010[1]), the following specimens were subsequently examined: Rapimenes granulimanus – 6 spms, (MNHN-IU-2013-10931), 1 spm. (IU-2013-11097), 2 spms (IU-2013-11077), Papua Niugini Expedition 2012, Madang Lagoon, Papua New Guinea, Dec. 2012, coll. Z Ďuriš. — Rapimenes laevimanus– 3 spms (UO-Jp2012), Nago-city, Okinawa, Japan, 26°33,6'N, 127°57.6'E, 10 May 2012, depth 30 m, on sea pen cf. Stylatula sp. [Pennatulacea]; coll.: N Sirakawa & Y Yamada, lgt. R Minemizu.—1 spm. SW Taiwan, coll. C-W Lin (fcn 20130202-08).
Diagnosis
Medium sized shrimps. Carapace smooth, with antennal and hepatic teeth; epigastric tooth lacking or, if present, clearly separated from them; hepatic tooth subequal and situated posteriorly of antennal tooth and slightly below. Rostrum slender, dorsal lamina bearing 6–10 teeth, ventral lamina obsolete, with 1–2 subterminal teeth. Inferior orbital angle produced, rounded. Pleon smooth, pleura posteroventrally rounded; telson slender, tapering distally, with 1–2 pairs of small dorsal spines and three pairs of posterior marginal spines. Ophthalmic somite without interocular process. Antennula and antenna normal, scaphocerite 3–4 times longer than broad. Eye with globular cornea and small accessory pigment spot, stalk distinctly longer than corneal diameter. Mandible without palp, incisor and molar processes stout. Maxillula with bilobed palp, upper and lower laciniae well developed. Maxilla with slender palp, well developed scaphognathite, distal (basal) endite bilobed; proximal (coxal) endite lacking. First maxilliped with simple palp, basal endite broad, coxal endite feebly demarcated, exopod well developed, caridean lobe normal, epipod distally bilobed. Second maxilliped with normal endopod and exopod, epipod small, simple, without podobranch. Third maxilliped with slender segments, ischiomerus and basis fused; exopod well developed, coxa with rounded lateral plate, single small arthrobranch present. Fourth thoracic sternites without special structures. First pereiopods slender, fingers narrow, simple, with dense tufts of long setae on sides, coxa with or without distoventral setose process, basis unarmed. Second pereiopods long and slender, distinctly unequal in length; major pereiopod overreaching scaphocerite by distal part of merus in adults; fingers simple, cutting edges entire or with 1–2 feebly developed teeth on proximal third of minor chela, and with 2–4 obtuse proximal teeth on major chela fingers; major pereiopod with palm 2.5–5 times longer than fingers. Ambulatory pereiopods slender, propodus with prehensile structure of long straight distoventral spines arranged to 2–5 pairs, spines longer than distal propodal depth; dactyli slender and curved, simple, or with distinct or minute distoventral tooth. Endopod of first male pleopod with angulate apex and distinct medial lobe; second male pleopod with appendix masculina with 3 terminal serrated setae and 2 lateral setae. Uropods normal; distolateral angle of exopod with small tooth and movable spine medially.
Etymology
Combination of rapina, Latin for claw, to point on the prehensile structures on the ambulatory legs, and the name of the genus Periclimenes Costa, 1844, from which the new genus is separated; gender masculine.
Figures
(selected). Bruce (1978[2]: figs 16–19), Ďuriš (1990[3]: figs 1–2; 2010[1]: figs 1–8).
Systematic position
Based on the recent molecular phylogeny in Horká et al. (2016)[4], the therein included two species of Rapimenes gen. n. are closely related to the genus Phycomenes Bruce, 2008, and to a pair of further Periclimenes spp., i.e. Periclimenes affinis, and Periclimenes kallisto, positioned near to Ancylocaris brevicarpalis comb. n. From Phycomenes, the species of the genus Rapimenes gen. n., can be easily distinguished by their larger size, distinctly unequal second pereiopods, prehensile ambulatory legs, and lack of a triangular process on the fourth thoracic sternum (see Bruce 2008b[5], Ďuriš 2010[1]). Morphologically, the new genus (i.e. the previous “Periclimenes granulimanus group”) is phylogenetically close to the “Periclimenes obscurus group”, as already indicated by Eilbracht and Fransen (2015)[6] who also listed the characters distinguishing all species of those two groups. Included in the “Periclimenes obscurus group” are some species which show distinct similarities to Rapimenes, such as Periclimenes macrorhynchia Eilbracht & Fransen, 2015, Periclimenes nomadophila Berggren, 1994, and Periclimenes tonga Bruce, 1988 (the latter synonymized with Periclimenes granulimanus by Marin 2012[7], but regarded as valid by Eilbracht and Fransen 2015[6]), particularly in the shape and proportions of the pereiopods and rostrum. These species have biunguiculate walking dactyli, sternal thoracic ridges, and distinct setose coxal lobe on the first pereiopod, i.e. the characters typical for the “Periclimenes obscurus group”. The ambulatory dactyli vary in Rapimenes spp. from simple to bearing a minute additional tooth; the latter is true for Rapimenes brucei, new comb., for which a coxal setose lobe also was reported (Ďuriš 1990[3]). It is thus possible that both species groups represent a common evolutionary clade which inner diversity is still to be resolved.
Distribution
Madagascar; Maldive Islands; Indonesia; Vietnam and Taiwan, South China Sea; Japan; Heron Island, Great Barrier Reef, Australia.
Ecology
The species of the present genus have been recorded as associated with antipatharians, hydroids, pennatularians, and scyphozoans (Cnidaria) (Bruce 1978[2], 1988[8], Ďuriš 1990[3], 2010[1], Minemizu 2013[9], Eilbracht and Fransen 2015[6]).
Remarks
The generic name Rapimenes was used as a nomen nudum by Marin (2009[10]: 15) in reference to the then undescribed species Periclimenes laevimanus Ďuriš (2010)[1], as “Rapimenes laevimanus Ďuriš & Petrusek (in press)”. The name is herein validly reinstated for the genus, indeed now containing Rapimenes laevimanus.
Key to species identification of Rapimenes gen. n
(modified from Ďuriš 2010[1]).
Original Description
- Ďuriš, Z; Horká, I; 2017: Towards a revision of the genus Periclimenes: resurrection of Ancylocaris Schenkel, 1902, and designation of three new genera (Crustacea, Decapoda, Palaemonidae) ZooKeys, (646): 25-44. doi
Images
|
Other References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Ďuriš Z (2010) Periclimenes laevimanus sp. nov. from Vietnam, with a review of the Periclimenes granulimanus species group (Crustacea: Decapoda: Palaemonidae: Pontoniinae). In: De Grave S Fransen C (Eds) Contributions to shrimp taxonomy. Zootaxa 2372: 106–125. http://www.mapress.com/zootaxa/2010/f/z02372p125f.pdf
- ↑ 2.0 2.1 Bruce A (1978) A report on a collection of pontoniine shrimps from Madagascar and adjacent seas. Zoological Journal of the Linnean Society 62: 205–290. https://doi.org/10.1111/j.1096-3642.1978.tb01039.x
- ↑ 3.0 3.1 3.2 Ďuriš Z (1990) Two new species of the palaemonid shrimp genus Periclimenes from the Maldive waters (Crustacea, Decapoda, Palaemonidae). Acta Societatis Zoologicae Bohemoslovacae 54: 1–8. https://decapoda.nhm.org/pdfs/25417/25417.pdf
- ↑ Horká I, De Grave S, Fransen C, Petrusek A, Ďuriš Z (2016) Multiple host switching events shape the evolution of symbiotic palaemonid shrimps (Crustacea: Decapoda). Scientific Reports 6: 26486. https://doi.org/10.1038/srep26486
- ↑ Bruce A (2008b) Phycomenes zostericola gen. nov., sp. nov., a new pontoniine shrimp (Crustacea: Decapoda: Palaemonidae) from Moreton Bay, Queensland. In: Davie P Phillips J (Eds) Proceedings of the Thirteenth International Marine Biological Workshop, The Marine Fauna and Flora of Moreton Bay, Queensland. Memoirs of the Queensland Museum – Nature 54: 219–232. http://www.qm.qld.gov.au/~/media/Documents/QM/About+Us/Publications/Memoirs+-+Nature/N54-1/n-54-1-bruce.pdf
- ↑ 6.0 6.1 6.2 Eilbracht J, Fransen C (2015) Periclimenes macrorhynchia sp. nov., a new hydrozoan-associated pontoniine shrimp (Crustacea, Decapoda, Palaemonidae) from North East Kalimantan, Indonesia. Zootaxa 3994: 377–395. https://doi.org/10.11646/zootaxa.3994.3.3
- ↑ Marin I (2012) New records and associations of pontoniine shrimps (Crustacea: Decapoda: Caridea: Palaemonidae: Pontoniinae) from the Nhatrang Bay, Vietnam; with taxonomic remarks on some species from the Indo-West Pacific region. In: Britayev T Pavlov D (Eds) Benthic fauna of the Bay of Nhatrang, Southern Vietnam 2. KMK Scientific Press, Moscow, 345–405.
- ↑ Bruce A (1988) Periclimenes tonga sp. nov., a commensal shrimp associated with a scyphozoan host from Tonga (Crustacea: Decapoda: Palaemonidae). Micronesica 21: 23–32. https://decapoda.nhm.org/pdfs/24923/24923.pdf
- ↑ Minemizu R (2013) Coral Reef Shrimps of Indo-West Pacific. Bun-Ichi Sogoshuppan, Co. Ltd., Tokyo, 145 pp. [In Japanese]
- ↑ Marin I (2009) A review of the pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific. Zootaxa 2289: 1–17. http://www.mapress.com/j/zt/article/view/7295
