Ancylomenes pedersoni (Chace, 1958) (Fig. 2, video 1) Periclimenes pedersoni — Williams 1984: 88 (Bonaire); Abele & Kim 1986: 16 (Bonaire); Spotte 1995: 546 (Bonaire); Wicksten 1995b: 477 (Bonaire); Wicksten 1998: 13 (Bonaire). Ancylomenes pedersoni — Brinkmann & Fransen 2016: 438 (Curaçao); Faasse 2016: 52 (Sint Eustatius); Poupin 2018: 105 (Sint Maarten). Material examined. Curaçao: RMNH. CRUS.D.26238: 2 ovigerous females, pocl. 3.8 mm; Piscaderabaai, off Carmabi, viii.1968, mangrove, collected by F. Nijhout. RMNH. CRUS.D.28322: 1 non-ovigerous female, pocl. 2.9 mm; Piscaderabaai, 22.iii.1963, depth 20 m, on Nemaster grandis Clark, 1909 and sea anemone, collected by H. Verbruggen. RMNH. CRUS.D.30621: 1 ovigerous female, pocl. 4.3 mm; between Piscaderabaai and Blauwbaai, 19.vii.1973, depth 16 m, on Condylactis gigantea (Weinland, 1860), collected by J.C. den Hartog. RMNH. CRUS. D.30622: 1 ovigerous female, pocl. 3.7 mm; between Piscaderabaai and Blauwbaai, 19.vii.1973, 16 m, coral reef, on Laviactis lucida (Duchassaing de Fonbressin & Michelotti, 1860), collected by J.C. den Hartog. RMNH. CRUS. D.37649: 1 non-ovigerous female, pocl. 3.2 mm; 2 ovigerous females, pocl. 4.0, 4.5 mm; 2 males, pocl. 2.5, 3.3 mm; Bojeo, 22.vii.1978, depth 10–20 m, on Bartholomea annulata (Le Sueur, 1817), collected by Svoboda. RMNH. CRUS.D.58063: 2 males, pocl. 1.6, 2.9 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 24.2 m, 26.iv.2005, scuba diving, on C. gigantea, collected by N. Snijders (fcn. g001). RMNH. CRUS.D.53153: 1 ovigerous female, pocl. 3.8 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 15.4 m, 26.iv.2005, scuba diving, on B. annulata, collected by N. Snijders. RMNH. CRUS.D.58064: 1 non-ovigerous female, pocl. 2.6 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 16.9 m, 26.iv.2005, scuba diving, on C. gigantea, collected by N. Snijders (fcn. g008). RMNH. CRUS.D.53147: 1 non-ovigerous female, pocl. 2.4 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 20.2 m, 26.iv.2005, scuba diving, on C. gigantea, collected by N. Snijders. RMNH. CRUS.D.53154: 1 male, pocl. 2.8 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 20 m, 26.iv.2005, scuba diving, on B. annulata, collected by N. Snijders. RMNH. CRUS.D.58065: 1 non-ovigerous female, pocl. 2.7 mm; stn CUR.01, south coast, Carmabi Reef/Hilton Pier, 12°16′19.2″N 068°58′09.0″W, depth 8.8 m, 26.iv.2005, scuba diving, on B. annulata, collected by N. Snijders (fcn. g013). RMNH. CRUS.D.58066: 1 non-ovigerous female, pocl. 2.9 mm; stn CUR.02, south coast, Atlantis diving/Drielstraat, 12°05′42.1″N 068°54′43.0″W, depth 19 m, 26.iv.2005, scuba diving, on Lobophora variegata (J.V. Lamouroux) Womersley ex E.C. Oliveira, 1977, collected by N. Snijders (fcn. g018). RMNH. CRUS.D.58067: 1 male, pocl. 2.7 mm; stn CUR.11, west point, Playa Kalki, 12°22′29.8″N 069°09′27.7″W, depth 15.4 m, 10.v.2005, scuba diving, on Lebrunia neglecta Duchassaing & Michelotti, 1860, collected by N. Snijders (fcn. g060). RMNH. CRUS.D.56996: 1 ovigerous female; stn COA.01, Hilton Reef, 12°07′18.44″N 68°58′10.23″W, 31.x.2013, depth 21 m, scuba diving, near C. gigantea, collected by C.H.J.M. Fransen (photo COA.01 046–050). RMNH. CRUS. D.56997: 1 ovigerous female; stn COA.18, Playa Forti, 12°21′58.10″W 69°09′13.50″N, 01.xi.2013, 15 m depth, scuba diving, near B. annulata, collected by C.H.J.M. Fransen (photo COA.18 009–010). Stn COA.19, Kleine Knip, 12°20′28.50″N 69°09′08.10″W, 01.xi.2013, scuba diving, near B. annulata, not collected (photo COA.19 099–043). Stn CF09A, Hilton Reef, 9.vi.2017, depth 15 m, scuba diving, on C. gigantea and Lebrunia coralligens (Wilson, 1890), C.H.J.M. Fransen (video 1), not collected. Stn CF10B, St. Michielsbaai, 10.vi.2017, depth 20 m, scuba diving, on C. gigantea and near Telmatactis cricoides (Duchassaing, 1850), C.H.J.M. Fransen (video 1), not collected. Stn CF11B, Parasasa Beach, 11.vi.2017, depth 10 m, scuba diving, on C. gigantea, C.H.J.M. Fransen (photo), not collected. Stn CF13A, Directors Bay, 13.vi.2017, depth 10 m, scuba diving, on B. annulata, C.H.J.M. Fransen (video 1), not collected. Stn CF13B, Tugboat, 13.vi.2017, depth 10 m, scuba diving, on B. annulata, C.H.J.M. Fransen (video 1), not collected. Stn CF17A, Habitat, 17.vi.2017, depth 10 m, scuba diving, on B. annulata, C.H.J.M. Fransen (video 1), not collected. Bonaire: stn BON.01, Punt Vierkant (Delfin’s Beach Resort), 12°06.908′N 068°17.659′W 22.x.2019, scuba diving, on C. gigantea, C.H.J.M. Fransen (video 1), not collected. Stn BON.02, Pink Beach (Kabayé), 12°03.849′N 068°16.896′W, 23.x.2019, depth 22 m, scuba diving, on C. gigantea, C.H.J.M. Fransen (video 1), not collected. Stn BON.04, Alice in Wonderland, 12°05,993′N 068°17,118′W, 24.x.2019, depth 30 m, scuba diving, on C. gigantea, C.H.J.M. Fransen (video 1), not collected. Stn BON.15, Red Beryl, 12°02.819′N 068°16.073′W, 28.x.2019, depth 8 m, scuba diving, near B. annulata, photo by C.H.J.M. Fransen, not collected. RMNH. CRUS.D.58068: 1 specimen, stn BON.43, Tori’s Reef, 12°04.247′N, 068°16.835′W, 8.xi.2019, depth 9 m, scuba diving, near L. lucida, collected by C.H.J.M. Fransen (video 1). Remarks. This genus Ancylomenes is polyphyletic (see Horká et al. 2016: fig. 2; Chow et al. 2021: fig. 2). A. pedersoni is closely related to two Caribbean anemone associated species of Periclimenes, P. rathbunae and P. yucatanicus. Its final taxonomic placements await the revision of the genus Periclimenes. Ecology. Associated with sea anemones Actinia bermudensis (McMurrich, 1889), Exaiptasia diaphana (Rapp, 1829), Bartholomea annulata, Bunodosoma granuliferum (Le Sueur, 1817), Cerianthus sp., Condylactis gigantea, Laviactis lucida, Lebrunia neglecta (Silbiger & Childress 2008; Brooker et al. 2019). Occasionally found on the black coral Plumapathes pennacea (Pallas, 1766) (Spotte 1995, as Antipathes pennacea), the jellyfish Cassiopea xamachana Bigelow, 1892 (Criales 1984), the corallimorpharians Ricordea florida Duchassaing & Michelotti, 1860 and Rhodactis osculifera (Le Sueur, 1817) (as Discosoma (Rhodactis) sanctithomae (Duchassiang & Michelotti, 1860)) (Williams & Williams 2000) and the bivalve mollusk Ctenoides scaber (Born, 1778) (Spotte 1995). Known as fish cleaner (Brinkmann & Fransen 2016; De Grave & Anker 2017; Horká et al. 2018). Here recorded from algae Lobophora variegata, probably due to the retraction of a host sea anemone. Distribution. Widely distributed in shallow waters of the tropical and subtropical western Atlantic from North Carolina to Espiritu Santo, Brazil, in depths between 1 and 40 m (De Grave & Anker 2017).

Published as part of Fransen, Charles H. J. M., 2023, The marine palaemonid shrimps (Crustacea, Deapoda, Caridea) of the Dutch Caribbean, pp. 1-127 in Zootaxa 5387 (1) on pages 15-17, DOI: 10.11646/zootaxa.5387.1.1, http://zenodo.org/record/10698994