Abstract
Hanleya brachyplax Simone & Jardim in Rios, 2009 is described in detail. The species occurs off the southeastern and south coast of Brazil (São Paulo and Santa Catarina states) in depths from 250 to 408 m. It differs from its congeners in having uniform white valves; wide intermediate valves; the tail valve with straight profile in the antemucronal area, and a concave postmucronal surface; and a cream-colored girdle, covered by non-articulated spines. An anatomical investigation was also performed, showing the main muscle groups; the presence of gills in the posterior third of the pallial groove; auricle with six orifices; a very flat kidney, restricted to the posterior half of the animal; and a simple esophageal region. The odontophore has a single pair of long cartilages. The buccal musculature is also described.
Highlights
Despite the publication of important mono‐ graphs on Polyplacophora (Pilsbry, 1892‐1894; Kaas & Van Belle, 1985a/b, 1987, 1990, 1994, Kaas, Van Belle & Strack, 2006), which include Brazilian spe‐ cies, and the work of some local specialists (e.g., Righi, 1967, 1971, 1973a/b), Brazilian chitons are still poor‐ ly understood
Other charac‐ teristics are important to this attribution, such as the well-developed insertion plates in the head valve; well-devel‐ oped apophysis on all valves; and the girdle covered by dorsal spines (Kaas & Van Belle, 1985:192)
Hanleya brachyplax differs from the European H. hanleyi (Bean in Thorpe, 1844) because it has randomly distributed pustules in the different re‐ gions of all valves, with the pleural and jugal areas sculptured; head valves have longer inser‐ tion plates; shell apex is lower; valves II to VII have weak marked diagonal lines and a slightly elevated lateral area; and similar-sized spines on the girdle
Summary
Despite the publication of important mono‐ graphs on Polyplacophora (Pilsbry, 1892‐1894; Kaas & Van Belle, 1985a/b, 1987, 1990, 1994, Kaas, Van Belle & Strack, 2006), which include Brazilian spe‐ cies, and the work of some local specialists (e.g., Righi, 1967, 1971, 1973a/b), Brazilian chitons are still poor‐ ly understood. Pair of ventral retractors of buccal mass (m1v) originating in lateral region of haemocoel, in mid-level of oral tube, from 3‐4 small points on each side; running anteriorly and dorsally; inserting on lateral side of posterior region of oral tube (Fig. 23).
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