. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 520 A. H. SCHELTEMA Illustrated paratypes: Nos. 1, 2: Type locality. USNM Nos. 850232 (No. 1), 850233 (No. 2). No. 3: Cape Verde Basin, 10°, 17°'W, 1624 m (ATLANTIS 11-31 Sta. 142, 5/II/67). USNM No. 850235. Description External morphology. Chevroderma scalpel/urn is a very small, broad species av- eraging mm in length and mm in trunk diameter in one population (Table VI); the largest specimen is mm long, and diameter ranges up to mm. The posterium is broad, mm on average, and one-third total b
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 520 A. H. SCHELTEMA Illustrated paratypes: Nos. 1, 2: Type locality. USNM Nos. 850232 (No. 1), 850233 (No. 2). No. 3: Cape Verde Basin, 10°, 17°'W, 1624 m (ATLANTIS 11-31 Sta. 142, 5/II/67). USNM No. 850235. Description External morphology. Chevroderma scalpel/urn is a very small, broad species av- eraging mm in length and mm in trunk diameter in one population (Table VI); the largest specimen is mm long, and diameter ranges up to mm. The posterium is broad, mm on average, and one-third total body length, averaging in posterium to trunk index; posterium length averages mm and ranges from to mm. Mid-dorsally the spicules are arranged nearly parallel to the long axis of the body, but meet at a distinct angle where the trunk joins the posterium (Fig. 3W). The oral shield is small and indistinct with a thin cuticle; oral shield spicules are also small and indistinct (Fig. 3V). Holotype: Total length mm; trunk by mm; posterium by mm; index of posterium to trunk length Oral shield by mm; index of oral shield to trunk diameter Spicules. The spicule base is broad relative to a usually short, narrow, often sharply pointed blade bent slightly outward; the waist is conspicuous (Figs. 5C, 12). Many spicules are nearly symmetrical. The longitudinal groove runs only part way along the base, not extending to the proximal edge but often extending onto the blade; it is sometimes nearly or totally lacking. The base may have faint, rather broad ridges and. C V FIGURE 12. Spicules of Chevroderma scalpellum n. sp.: a-d and specimen, paratype no. 1, 1427 m, Angola Basin (type locality); H. holotype, trunk spicule; A. spicule from body region c of another specimen from type locality; CV. spicule from region c, paratype no. 3, 1624 m. Cape Verde Basin. Upper spicules: above, oblique view of body region c spicule; below, lateral vi
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
