Trochozoa. Monoplacophorans ("limpet-like", "living fossils") Gastropods (snails, slugs, limpets, sea hares) Cephalopods (nautiloids, ammonites, squid, etc.) What are the key lineages of lophototrochozoans? crustaceans and bivalves. starfish and cephalopods. a mantleb. Annelida: information (1) Annelida: pictures (33) Class Aplacophora. All organisms that we will investigate in the remaining animal labs have primary bilateral symmetry and are triploblastic, having three true germ layers: ectoderm, mesoderm and endoderm that form during gastrulation of the blastula stage of development. These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical. Finally, the mantle secretes a calcium-carbonate-hardened shell in most molluscs, although this is greatly reduced in the class Cephalopoda, which contains the octopuses and squids. Visual Connection. Extinct Fossil Families . These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical. Lophotrochozoa: Brachiopods. 2003, Canapa et al. FREE Expert Solution Show answer. The valve (shell) that has the attachment for the pedicle is the pedicle valve which is usually the lower and larger valve. Lophotrochozoa: pictures (320) Lophotrochozoa: specimens (126) Lophotrochozoa: maps (42) Related Taxa. Result: By comparative genomic analysis, we found massive expansions of nAChR genes in molluscs and some other lophotrochozoans. B. Chelicerates are a group of arthropods. 2006, Zhang et al. Introduction. The expansion is particularly pronounced in stationary bivalve molluscs with simple nervous systems, with the number of nAChR genes ranging from 99 to 217 in five bivalves, compared with 10 to 29 in five ecdysozoans and vertebrates. saprophytese. Recent findings regarding early lophotrochozoan development have altered the conventional model of neurogenesis and revealed that peripheral sensory elements play a key role in the initial organization of the larval nervous system. These phyla are also bilaterally symmetrical, meaning that a longitudinal section will divide them into right and left sides that are symmetrical. Orthrozanclus. Phylum Rotifera Platyhelminthes Turbellaria Cestoda Trematoda Annelida Mollusca. 3 List five characteristics found in organisms placed in phylum Platyhelminthes. Lophotrochozoa. of described species: 10,000 First appearance: Lower Cambrian Habitats: marine, estuarine, and freshwater Shapes: mostly two-shelled; some worm-like Feeding types: mostly suspension feeders; some detritivores. Problem Details. The Lophotrochozoa are a diverse group of phyla with similar ribosomal RNA sequences. More than 15,000 living species of bivalves are known, of which about 500 live in fresh water; the others occur in all seas. Muscular foot hatchet-shaped (flattened side-to-side, like a wedge), often used in burrowing. a radulad. a. a mantle b. tentacles c. a radula d. an external shell. ), before metamorphosing to adult form. Lophotrochozoans - Rotifera Mollusca - Bivalvia There is great variation in size The smallest species are freshwater clams that are less than 2 mm long The largest species are marine clams that may weigh over 200 kg All bivalves can sense gravity, touch, and certain chemicals Scallops even have eyes. Bivalves are the second largest group of extant mollusks and exhibit the most altered body plan of the phylum (for example, the radula has been replaced in many cases by a filter feeding apparatus, the head and mouth have been lost, and the body is encased in a bivalve shell (Giribet and Distel 2003)). Lophotrochozoa . Head and sense organs poorly developed. Aplacophora: information (1) Aplacophora: pictures (5) Class Bivalvia. 2005, Iijima et al. In some mollusks (such as gastropods and bivalves), the trochophore develops into a second stage, the veliger (q.v. Trochophore. This extreme morphological disparity has prompted numerous conflicting phylogenetic hypotheses about relationships among lophotrochozoan phyla. Lophotrochozoa Slides by Jonathan Eisen for BIS2C at UC Davis Spring 2016 Lophotrochozoa A trochophore is a specialized, free-swimming larval stage. Lophotrochozoa is a clade of Protostomia characterized by several phyla which show a wide morphological diversity. Bivalves are filter-feeders, and a radula is absent in this class of mollusks. 1. No. Many species filter-feed, straining small particles from the water.
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