Fig. 24.3.

Wed, 2020-03-18 14:10 -- hwadmin
Polychaetes. (A) Family Serpulidae: Eulaeospira sp., firmly attached to a blade of seagrass. These small animals filter feed and they are able to seal off their tubes as one of the branchial filaments is modified to form a plug or an operculum. In some species a brood chamber is developed underneath the operculum (Photo: T. Macdonald). (B) Family Serpulidae: Hydroides sanctaecrucis. Close-up of calcareous tubes on a fouled yacht (Photo: J. Lewis). (C) Family Serpulidae: Hydroides sanctaecrucis. This is an introduced species that has colonised a yacht in a marina in Cairns. (Photo: J. Lewis.) (D) Family Terebellidae: Lanice viridis. This is a surface deposit feeder living under rocks or at the base of bommies. Size: 30–50 mm in length, excluding tentacles (Photo: A. Semenov). (E) Family Polynoidae: A scale worm, probably a species of Iphione, crawling over coarse sediment. Scale worms are active carnivores, catching prey using their eversible pharynx. Encrusting barnacles are present on some elytra in this specimen (Photo: R. Steene). (F) Family Hesionidae: Hesione sp. or Leocrates sp., crawling over the substrate. Hesionids are active carnivores that feed by everting the pharynx and sucking up their prey (Photo: R. Steene.) (G) Family Questidae: Questa ersei. Line drawing of anterior end of the animal, showing its simple body lacking parapodia, paired bundles of chaetae on all segments and the head reduced to a simple palpode with an eversible pharynx. Found living within sediment, it can reach lengths of up to 10 mm. (Figure reproduced with permission from Beesley PL, Ross GJB, Glasby CJ (Eds) (2000) Fauna of Australia – Volume 4A: Polychaetes and Allies: The Southern Synthesis. Australian Biological Resources Study/CSIRO Publishing). (H) Family Chaetopteridae: Mesochaetopterus sp. One is removed from its tube and the other is still in its flimsy tube made of sand grains. These worms are common in reefal sediments. The anterior palps are used for feeding. The enlarged parapodial lobes in the mid-body create water currents that pass through the tube and particles of food are collected. Size: up to 10–20 mm in length (Photo: K. Atkinson). (I) Phoronid: These animals are always associated with burrowing sea anemones (Photo: K. Attwood). (J) Externally brooded embryos in Pionosyllis elegans are attached to the ventral cirri by glandular secretions; dci= dorsal cirrus, emb= embryos (Source: after Pierantoni 1903). (K) Multiple male stolon production from the venter of posterior segments in Trypanosyllus crosslandi; dci= dorsal cirrus, sto= stolons (after Potts 1911, redrawn by K. Nolan). (L) Line drawings of a marine oligochaete (Illustration: K. Attwood).
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