Phragmatopoma caudata Krøyer in Mörch, 1863

Chávez-López, Yessica, 2020, New species and new records of Phragmatopoma (Polychaeta: Sabellariidae) from Tropical America, Zootaxa 4845 (3), pp. 301-330 : 307-308

publication ID	https://doi.org/ 10.11646/zootaxa.4845.3.1
publication LSID	lsid:zoobank.org:pub:D737FF5C-63F8-4E80-A605-789A5FEB1B2C
DOI	https://doi.org/10.5281/zenodo.4407386
persistent identifier	https://treatment.plazi.org/id/977F915B-FFB9-FFDE-FF7C-F9D7FD62F86B
treatment provided by	Plazi
scientific name	Phragmatopoma caudata Krøyer in Mörch, 1863
status

Treatment

Phragmatopoma caudata Krøyer in Mörch, 1863 View in CoL

Figures 4 View FIGURE 4 A–K, 12A

Phragmatopoma caudata Krøyer in Mörch, 1867: 442–444 View in CoL , pl. 11, figs. 27–30. Type locality: Caribbean Sea.

Phragmatopoma caudata View in CoL .— Hartman 1959: 473 ( West Indies , catalog of the Polychaeta View in CoL ); Kirtley 1994: 31–36, figs. 2.3.1–2.3.6 ( Brazil; Miami Beach, Florida; Veracruz, Mexico; Venezuela); Occhini et al. 2009: 739–746, figs. 2–8 (Rio de Janeiro, Brazil) ; Dos Santos et al. 2011: 426–427, figs. 2A–B ( Brazil, 7°01’02”S, 34°47’55”W); de Assis et al. 2012: 12, 32 (do Bessa Beach, Brazil) GoogleMaps ; Liñero-Arana 2013; 383–384, fig. 2 ( Venezuela).

Phragmatopoma lapidosa Kinberg, 1867 View in CoL .— Johansson 1926: 2; Hartman 1944: 348–349, pl. 35, figs. 73–75, pl. 36, fig. 79, pl. 40, figs. 102–103 ( Brazil to Miami, Florida); Hartman 1959: 473 ( Brazil, catalog of Polychaeta View in CoL ); Amaral 1987: 471–474, fig. 1–6 (characterization of P. lapidosa View in CoL from Brazilian coast); Lana & Bremec 1994: 212–213 (checklist of polychaetes from South America and identification key); Baez & Ardilla 2003: 103 (Colombian Caribbean).

Material examined. 51 specimens. Veracruz: ECOSUR-P3084, one spec. (La Gallega, 19°13’13”N, 96°09’51”W, July 12, 2000, coll. J. R. Bastida-Zavala) GoogleMaps ; ECOSUR-P3085, one spec. (La Mancha, 19°35’24”N, 96°22’41”W, January 23, 2004); ECOSUR-P3086, 13 spec. (La Mancha, 19°35’24”N, 96°22’41”W, January 27, 2004); ECO-SUR-P3087, 13 spec. (La Mancha, 19°35’24”N, 96°22’41”W, April 1, 2004); ECOSUR-P3088, five spec. (Monte Pío, 18°38’45”N, 95°05’47”W, April 2, 2004); ECOSUR-P3089, 15 spec. (La Mancha, 19°35’24”N, 96°22’41”W, May 27, 2004); ECOSUR-P3090, one spec. (La Mancha, July 31, 2004); ECOSUR-P3091, one spec. (Monte Pío, 18°38’45”N, 95°05’47”W, August 1, 2004); ECOSUR-P3092, one spec. (La Mancha, 19°35’24”N, 96°22’41”W, September 23, 2004); ECOSUR-P3093, one spec. (La Mancha, 19°35’24”N, 96°22’41”W, September 27, 2004).

Description. Color pattern of preserved specimens. Body pale yellow ( Fig. 4A View FIGURE 4 ). Outer paleae with amber blade and handle; median plume translucent ( Fig. 4D View FIGURE 4 ). Middle paleae, of the mid-dorsal section of the opercular crown, cherry with dark-amber handle ( Fig. 4E View FIGURE 4 ); mid-ventral paleae, cherry to dark amber from the nape toward the tip ( Fig. 4F View FIGURE 4 ). Inner paleae amber ( Fig. 4G View FIGURE 4 ). Opercular papillae pale yellow. Median ridge with brown eyespots ( Fig. 4C View FIGURE 4 ). Tentacles light brown. Building organ and branchiae pale yellow. Parathoracic chaetae translucent ( Fig. 4 View FIGURE 4 H–I). Abdominal neuropodia with a series of brown points; the last neuropodia completely dark brown ( Fig. 4A View FIGURE 4 ). Abdominal neurochaetae and uncini translucent ( Fig. 4J View FIGURE 4 ). Caudal peduncle dark brown to pale yellow toward distal part ( Fig. 4A View FIGURE 4 ).

Body. Complete specimen of 12 mm total length; parathoracic region 1 mm wide; 27 abdominal segments; caudal peduncle 4 mm long ( Fig. 4A View FIGURE 4 ).

Operculum. Opercular crown and opercular stalk completely fused. Opercular crown conic and circular, protruding in lateral view ( Fig. 4A, B, K View FIGURE 4 ). Three rows of paleae, only two visible: ~50 outer paleae, 22 middle and inner paleae. Outer paleae geniculate with a pair of heterodont teeth, one straight and lacerate, and the other curved; flat blade almost twice longer than wide, serrated margin and without visible transversal thecae; median plume long, slightly longer than the blade, acicular, pectinate and branched distally ( Figs. 2I View FIGURE 2 , 4D View FIGURE 4 ). Median plume straight or slightly curved in lateral view. Middle paleae strongly geniculate with straight peak, smooth surface with transversal thecae; sub-circular nape, straight, smooth surface, wider than peak, and large, 1/3 as long as peak in dorsal middle paleae ( Fig. 4E View FIGURE 4 ) and 2/ 5 in ventral paleae ( Fig. 4F View FIGURE 4 ); small chin, longer than wide, with margin slightly serrated; sharp tip strongly curved in dorsal paleae ( Fig. 4E View FIGURE 4 ), blunted tip falcate in the ventral ( Fig. 4F View FIGURE 4 ). Inner paleae strongly geniculate with straight serrated peak, eight times longer than wide; nape smooth; tip with filaments ( Fig. 4G View FIGURE 4 ). Papillae small and oval. Oral tentacles unbranched. Median ridge long, almost 1/3 as long as opercular stalk, with marginal eyespots ( Fig. 4C View FIGURE 4 ). Median organ absent. Building organ with ‘U’ shape.

Thorax. Chaetiger 1 with a pair of neuropodia.

Parathorax. Three parathoracic segments. Chaetigers with a pair of branchiae. Notopodia with lanceolate chaetae interspersed with capillary chaetae ( Fig. 4H View FIGURE 4 ). Neuropodia with lanceolate chaetae interspersed with small lanceolate chaetae ( Fig. 4I View FIGURE 4 ); neurochaetae thinner than notochaetae.

Abdomen. Segments with a pair of branchiae decreasing in size towards posterior segments. Neurochaetae verticillate of different lengths. Notopodia with a series of uncini with eight pairs of teeth ( Fig. 4J View FIGURE 4 ).

Caudal region. Caudal peduncle elastic and smooth ( Fig. 4A View FIGURE 4 ).

Tube. Tubes with thick sand grains and some fragments of shell ( Fig. 12A View FIGURE 12 ).

Variation. Body measurements varied from 5–19 mm total length, parathoracic region 0.5–1.2 mm wide and caudal peduncle 1–4 mm long. Most specimens were incomplete. The number of paleae varied between 43–65 in outer paleae and 16–26 in middle paleae. The abdominal segments varied from 23–31.

Habitat. Phragmatopoma caudata can build aggregations in sublitoral zone, generally shallower than 10 m depth ( Kirtley 1994).

Distribution. Western Atlantic, from Gulf of Mexico to Southern Brazil ( Nunes et al. 2017) ( Fig. 13 View FIGURE 13 ).

Remarks. The specimens of Veracruz coincided with descriptions of P. caudata by Hartman (1944) and Amaral (1987). Phragmatopoma caudata differs from the other species of the genus by having outer paleae with long median plume, acicular and pinnate, and the presence of eight teeth in notopodial uncini of the abdominal region.

Kirtley (1994) synonymized P. lapidosa with P. caudata . Later, Drake (2007) and Nunes et al. (2017) supported Kirtley’s synonymies with molecular phylogenetics. Recently, Nunes et al. (2017) study demonstrated the presence of two distinct populations of P. caudata in the Atlantic Ocean, one in Florida, another in the Caribbean and Brazilia. Phragmatopoma caudata is probably the most abundant of sabellariids in the Atlantic Ocean. On the other hand, the records of P. caudata from Peru ( Johansson 1926, Hartman 1944) are questionable because of the significant distance between this country and the type locality.