Crisia aculeata Hassall 1841 (original) (raw)

2021

Abstract

<i>Crisia aculeata</i> Hassall, 1841 (Fig. 8 A-C) <i>Crisia aculeata</i> Hassall, 1841: 170, pl. 7, figs 3-4. — Harmer 1891: 132, pl. 12, fig. 4. — Hayward &amp; Ryland 1985: 50, fig. 14. — Harmelin1990: 1602, figs 2, 3-6. OCCURRENCE. — Recent: Eastern Atlantic (50-60 m in the North Sea, much deeper in Norway, the Bay of Biscay and Morocco: 135- 1000 m) and Mediterranean (115-480 m). DESCRIPTION Cellariiform colony. Internodes short (8-12 zooids). The first ramification arises from the third zooid. Pseudopores elongate and relatively rare. Gonozooid pyriform with a discrete ooeciostome situated near the base of the following zooid. REMARKS This species is poorly known and has rarely been illustrated. It has often been considered as a variety of <i>C. eburnea</i> (Linnaeus) to which it resembles. Harmelin (1990) distinguished a northern (Atlantic) and a southern form (Atlantic coast of Morocco, Mediterranean). The main differences are a higher number of zooids (9-12) per internode and a mitre-shaped gonozooid in the southern form.

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