Loimia bermudensis Verrill, 1900

Londoño-Mesa, Mario H., 2009, Terebellidae (Polychaeta: Terebellida) from the Grand Caribbean region 2320, Zootaxa 2320 (1), pp. 1-93 : 37

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https://doi.org/ 10.11646/zootaxa.2320.1.1



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Loimia bermudensis Verrill, 1900


Loimia bermudensis Verrill, 1900  

Figures 9 View FIGURE 9 A-H

Loimia bermudensis, Verrill, 1900:664–665   .

Type material: Syntypes YPM 1018 View Materials (1) Bermuda, 1900; coll. A.E. Verrill, Exp.   YPM 1088 View Materials (1) Bailey Bay , Bermuda, 1898; coll. A.E. Verrill, Exp. Low   water, under stones (in poor condition). Slide YPM 36713 View Materials –14 View Materials (notopodia and neuropodia, in poor condition)   .

Description: Best syntype ( YPM 1018) incomplete, with 33 segments, 29mm long, thorax 17mm long, 5mm wide ( Fig. 9A View FIGURE 9 ). Tentacular membrane short, narrow, rounded edge with mid-dorsal discontinuity dividing membrane in two; eyespots absent; tentacles missing. Upper lip short, narrow, damaged. Lower lip short, hidden by segment 1 ( Fig. 9B View FIGURE 9 ). First pair of lateral lappets projecting forwards, with well-developed lateral margins laterally surrounding tentacular membrane ( Fig. 9C View FIGURE 9 ), and ventrally lower lip; second pair damaged, with wide base, not connected to ventral shield, and with dorsal edge almost as long as first lateral lappet, slightly developed, not covering base of branchiae. Ten ventral shields from segment 3; first shield shorter; second shield the largest, divided in two, with anterior portion shorter; next three shields decreasing in size posteriorly; last 5 shields all of similar size. Next thoracic segments with smooth ventral gap between neuropodia. Abdomen without mid-ventral longitudinal groove. Nephridial papillae not seen. Notopodial glandular tissue absent. Branchiae branched, spiralled, but damaged in the specimen ( Fig. 9D View FIGURE 9 ). Notochaetae of two lengths, unilimbate, pointed; chaetae with some longitudinal striations ( Fig. 9E View FIGURE 9 ) appear as fringes due to chaetal damage. Uncini from segment 5–10 pectinate ( Fig. 9F View FIGURE 9 ), with five aligned equal-sized teeth; PP developed, angular; PF absent; Oc long, concave; Cp with 1 vertical row of five teeth, equal-sized; USr concave; SrP absent; LSr convex; AP with thin and long AF, projected downward; Bs strongly convex. Uncini from segments 11–20 ( Fig. 9G View FIGURE 9 ) pectinate, with five aligned equal-sized teeth; abdominal uncini pectinate, smaller ( Fig. 9H View FIGURE 9 ), with five aligned equal-sized teeth. Abdominal neuropodia well developed, as swollen lappets with short rows of uncini. Pygidium missing.

Variation: It is not possible to find variation since the second syntype ( YPM 1088 View Materials ) is in poor condition and there are no more additional specimens. Moreover, the slides are also in poor condition   .

Discussion: This species was synonymized with L. medusa   (Savigny in Lamarck, 1822) by Hartman (1942). Nevertheless, although L. bermudensis   is similar to L. medusa   in terms of the number of teeth in both thoracic and abdominal uncini, they differ in the shape of the uncini. L. medusa   has uncini with teeth decreasing in size, and uncini with a well-developed subrostral process. This uncinal condition could give an appearance of the uncini as being avicular. In contrast, L. bermudensis   has uncini with teeth almost all the same size, without a major variation in the size, and uncini without subrostrum process; this uncinal condition gives the uncini its pectinate appearance. Thus, it could be possible that some material from the Grand Caribbean   reported as L. medusa   may belong to L. bermudensis   . A revision of the genus Loimia   is almost completed and will be published by the author and collaborators in the near future.

Type locality and distribution: Bailey Bay , Bermuda   .


Peabody Museum of Natural History














Loimia bermudensis Verrill, 1900

Londoño-Mesa, Mario H. 2009

Loimia bermudensis, Verrill, 1900:664–665

Verrill, A. E. 1900: 665