Special collar chaetae coarsely serrated.
Operculum spherical or with a flat end-plate, never with spines ( Fig. Tube white, with small peristomes without transverse ridges, longitudinal ridges or alveoli ( Fig. This species is gregarious and can form colonies. 130–5, “on bottom, standing water”, 2 Apr. 8★9'40" N, 79☃5'20" W, Miraflores Spillway, Canal Zone, Panama City, Panama, sta. Méndez) USNM 58659, 20+ specimens (approx. Salazar-Vallejo et al.) UMAR-Poly 51, 10+ specimens (23☀9' N, 106☁9' W, Urias estuary, Mazatlán, Mexico, 1999, coll. More than 160 specimens: ECOSUR s.n., 129+ specimens (Chetumal Bay, pier, 1990–1996, coll. 2012: 12, figs a–e (Gulf of California: La Paz, Baja California Sur).Ģ24 specimens: JX (4) Aug. 2009: 327 – 328, figs 3g–i, 6a, 7a–c (as an invasive species in Mazatlán, Sinaloa, Mexican Pacific). 5B–D (Sinaloa, Mexican Pacific and Canal Zone of Pacific Panama). Bastida-Zavala & ten Hove 2003: 92 (probably from Costa Rica on mangrove oysters, 4i–s (eastern Mexico: Tecolutla, Veracruz and Chetumal Bay, Mexican Caribbean on oysters and docks). Bastida-Zavala & Salazar-Vallejo 2000a: 813, fig.
Perkins 1998: 95 (checklist of shallow-water polychaetes from Florida). , pebbles, limestone boulders on sandy mud and
– ten Hove & Weerdenburg 1978: 106 –109, figs 1f–i, 3c, 4h–i, q, v–w, eeii, xx, 5a–b (revision of the genus and specimens from Florida, Louisiana, Jamaica, Barbados, Curaҫao, Belize, and Canal Zone of Pacific Panama in brackish water, 2.5–31‰, intertidal to 1 m, on the carapace of II, figs 21–23 (type locality: Larios Estuary, Tecolutla and Carmen Lagoon, Veracruz, eastern Mexico also from Barra de Nautla, Veracruz in brackish water, on mangrove roots, Mercierellopsis prietoi Rioja, 1945: 413–417 figs 1–5 (type locality: Miami River, Florida, United States). Sphaeropomatus miamiensis Treadwell, 1934: 339–341 Ficopomatus miamiensis ( Treadwell, 1934)
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