FIGURE 9 - uploaded by Ivan N. Marin
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Pontonides unciger Calman, 1939. Ovigerous female (ZMMU 5490). A, habitus. B, front of carapace, dorsal view. C, mandible. D, maxillule. E, third maxilliped. F, second maxilliped. G, antenna. H, antennule. I, first pereiopod. J, first pereiopod, finger tips. K, major second pereiopod. L, minor second pereiopod. M, chela of major second pereiopod. N, chela of minor second pereiopod. O, third pereiopod. Scale bars: 1 mm (A); 0.8 mm (B, I, K, L, O); 0.5 mm (C-G, H, M, N); J drawn without scale.
Source publication
Three of the six known species of the palaemonid shrimp genus Pontonides Borradaile, 1917 are reported from Nhatrang Bay, Vietnam. Pontonides unciger Calman, 1939 is redescribed based on an ovigerous female collected from the bushy black coral, Antipathes sp. (Antipatharia, Antipathidae), at a depth of 40-45 m. Pontonides maldivensis (Borradaile, 1...
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Citations
... The relationship between the known species of the genus Propontonia is confirmed both morphologically and genetically, while such a previously considered important feature as the reduction of the exopodal flagellum of maxilliped III is seems to be an interspecific, but not a generic-level in this group (genus) of palaemonid shrimps. Similar reduction of the exopodal flagellum of maxillipeds II-III, is characteristic of a number of other soft corals associated palaemonid shrimp genera , for example, the Indo-West Pacific genera Hamodactylus [Fransen, 2013;Fransen, Rauch, 2013;Horká et al., 2016b], Hamodactyloides Fujino, 1973[Holthuis, 1958Fujino, 1973], Ctenopontonia Bruce, 1979[Fujino, 1973, Fennera Holthuis, 1951[Holthuis, 1951Bruce, 1979], Mesopontonia Bruce, 1967[Holthuis, 1951 and Pontonides Borradaile, 1917 [Marin, 2007], the Eastern Pacific Veleronia Holthuis, 1951, Pseudoveleronia Marin, 2008[De Ridder, Holthuis, 1979Marin, 2008] and Waldola Holthuis, 1951[Holthuis, 1951Bruce, 1969a]. Additionally, Exopodal flagellum of maxilliped III is partially reduced in coral-associated Anapontonia denticauda Bruce, 1966, Ischnopontonia lophos (Barnard, 1962 and Metapontonia fungiacola Bruce, 1967[Bruce, 1966, 1967Marin, 2008Marin, , 2011. ...
The Indo-West Pacific palaemonid shrimp genus Propontonia Bruce, 1969 (Decapoda: Palaemonidae), associated with the alcyonarian soft corals (Anthozoa: Octocorallia), is partially revised. Periclimenes kempi Bruce, 1969 is transferred to the genus, as well as a new species is described from the Line Islands. The diagnosis of the genus is modified and clarified, while the absence/presence of a well-developed exopodal flagellum of maxilliped III is considered only as a species-level morphological feature. The identification key to all known species of the genus Propontonia is presented.
... Shrimps are also commonly observed on black corals as well as on many other sessile organisms. In particular, members of the Pontoniidae family are well represented (de ridder & holthuiS 1979;criAleS 1980;mArin 2007). They hide from predators thanks to the host colony morphology (Wirtz & d'udekem d'Acoz 2001). ...
... They hide from predators thanks to the host colony morphology (Wirtz & d'udekem d'Acoz 2001). They are generally found living in heterosexual pairs, although larger groups may occur (Bruce 2005;mArin 2007). Recently, the myzostomid worm Eenymeenymyzostoma nigrocorallium Terrana & Eeckhaut 2017 has been reported to live in the digestive tract of black corals (terrAnA & eeckhAut 2017). ...
Shallow-water antipatharians host many symbiotic species, which spend their adult life with their host and/or use them to have access to food. Here we determine the trophic relationships between four common macrosymbionts observed on/in Cirripathes anguina, Cirrhipathes densiflora and Stichopathes maldivensis in SW Madagascar. These include the myzostomid Eenymeenymyzostoma nigrocorallium, the gobiid fish Bryaninops yongei, and two palaemonid shrimps, Pontonides unciger and Periclimenes sp. The first is an endosymbiont living in the digestive tract, while the others are ectosymbionts. The analyses show that most likely (i) none of the symbionts uses the host as a main food source, (ii) nocturnal plankton represents a main part of the diet of antipatharians while the symbionts feed preferentially on diurnal plankton, (iii) the myzostomid has the narrowest trophic niche, (iv) the two shrimps have distinct trophic niches and feed at lower trophic level than do the other symbionts. Concerning the myzostomids, they had the same δ13C values but had significantly higher δ15N values than the hosts. TEFs (Trophic Enrichment Factors) recorded were Δ13C = 0.28 ± 0.25 ‰ and Δ15N = 0.51 ± 0.37 ‰, but these were not high enough to explain a predator-prey relationship. These worms rely on the coral diet but may also ingest host fluids explaining the slight enrichment in heavier nitrogen isotopes. On the other hand, the ectosymbionts use the coral as a pathway to have access to food from the midwater: they feed from the water passing nearby the black corals, but a kleptoparasitic behaviour cannot be excluded.
The type specimens of Pontonides sympathes De Ridder & Holthuis, 1979, Veleronia serratifrons Holthuis, 1951, and V. laevifrons Holthuis, 1951 were re-examined. Pontonides sympathes is transferred to Veleronia Holthuis, 1951, based on morphological similarity with V. serratifrons, the type species of the genus. At the same time, a new genus, Pseudoveleronia gen. nov., is erected for Veleronia laevifrons. Detailed re-descriptions of all studied species as well as a key to the genera Pontonides Borradaile, 1917, Veleronia and Pseudoveleronia gen. nov. are given.
A new species of pontoniine shrimp, Periclimenes nevillei, from Espiritu Santo, Vanuatu, is described and illustrated. The species is an associate of an antipatharian host, Cirripathes sp. A member of the Periclimenes brevicarpalis species group, to which a key is provided, it most closely resembles Periclimenes albolineatus Bruce & Coombes, 1997.
Recent collections of pontoniine shrimps from Heron Island, southern Great Barrier Reef, have provided further additions to the Australian marine fauna. A new species, Periclimenes poriphilus sp. nov., is described and illustrated. It is the first species of its genus to be found actually in a sponge host. Several other Periclimenes species have been reported as associates of sponges. Periclimenaeus arthrodactylus Holthuis, 1952, is reported for the second time only, previously known only from a single specimen collected in the Pulau Sailus Ketjil, Java Sea, Indonesia, in 1899, and new to the Australian fauna. Further specimens of Typton wasini Bruce, 1977 are recorded and Typton nanus Bruce, 1987 is re-assessed as a junior synonym of T. wasini, having been based on a juvenile specimen. An up-dated checklist of the Heron Island pontoniine fauna is also provided.
Hamopontonia nhatrangensis sp. nov. (Crustacea, Decapoda, Palaemonidae, Pontoniinae) is described from Nhatrang Bay, Vietnam, in association with caryophyllid coral Euphyllia glabrescens (Chamisso & Eysenhardt, 1821) (Hexacorallia, Scleractinia, Caryophyllidae). The new species clearly differs from congeners by morphological features, distinctive coloration and ecologically. Renewed differential key to all known species of the genus Hamopontonia Bruce, 1970 is provided.
