Protoconch meaning

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August undefined, 2024

Webb6 nov. 2024 · The embryonic shell, or protoconch, bears a distinct sculptural design from the rest of the shell. This is the section of the snail’s shell that it possesses when it is born. ... Snails are hermaphroditic, which means they use sexual reproduction to help maintain genetic variation. Webb貝類/主要用語解説かいるいしゅようようごかいせつ. 【】の無いものは、巻き貝、二枚貝、掘足類、頭足類の各類に共通。. ＊印は別に本項目があることを示す。. 足 (あし) foot. イカ・タコ類を除いて動物体の腹側にあり、柔軟性に富む筋肉からなる。. 砂 ...

Homology problems in cephalopod morphology: deceptive …

WebbProtoconch. A protoconch (meaning first or earliest or original shell) is an embryo nic or larva l shell of some classes of mollusc s, e.g., the initial chamber of an ammonite or the larval shell of a gastropod.The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines.. The whorls of the adult shell, … http://dictionary.education/english/dictionary/protoconch reflective ceiling panels

PROTOCOL English meaning - Cambridge Dictionary

Webb17 dec. 2008 · Protoconch : Diameter somewhat variable, 1.6–2.2 mm, comprising approximately 2.0 whorls; the first whorl is set at a pronounced angle, rising to the start of the second whorl which is initially flat-sided with an almost ridge-like apical angle, becoming more evenly convex toward the end of the whorl; sculptured with widely … Webb2 apr. 2014 · The openly coiled protoconch is anachronistic in this Triassic gastropod. Type species. Anachronistella peterwagneri sp. nov. Diagnosis. Protoconch widely openly coiled with faint axial larval ornament and an abrupt transition to the teleoconch; teleoconch high-spired with indistinct wavy axial ribs. Anachronistella peterwagneri sp. … Webbadjective satelliteinformal or slang terms for mentally irregular wacky; loopy; bats; haywire; nuts; balmy; kooky; nutty; barmy; around the bend; buggy; kookie; loony; whacky; crackers; round the bend; daft; dotty; batty; cracked; fruity; bonkers. it used to drive my husband balmy More 'loco' Meaning locoIdioms/Phrases locoAssociated Words reflective cat\u0027s eyes

Homology problems in cephalopod morphology: deceptive

WebbMeanings and definitions of "protoconches" noun. plural of [i]protoconch[/i] more . Sample sentences with "protoconches" Declension Stem . Morphology and microstructure of a juvenileAulacoceras, with protoconch, phragmocone and rostrum, are described. springer. Webbcoiled protoconch to a limpet-shaped teleoconch. The opisthobranch (Fig. 3) illustrates a different change in coiling geometry, switching from sinistral to dextral growth. Ever since the classic studies of Thorson (1950), the size, shape, and number of whorls of the protoconch have been used to infer larval ecology and life-history traits. reflective chainWebbThe operculum, meaning little lid, (plural: opercula or operculums) is a corneous or calcareous structure which exists in some groups of marine, freshwater, and land snails or gastropods. It is present in most but not all gastropods that have shells and gills. reflective cat harness

"Webbnoun (zoology) The embryonic shell, or first chamber, of ammonites and other cephalopods. Wiktionary Advertisement Other Word Forms of Protoconch Noun … " - Protoconch meaning

Protoconch meaning

Protoconch Definition & Meaning - Merriam-Webster

WebbNoun teleoconch ( pl. teleoconchs or +) ( zoology) The portion of a shell of a conchiferan mollusc formed immediately after the larval stage of the life cycle of the organism. 1995, Haszprunar, G., Salvini-Plawen, L. von, & Rieger, R. M. (1995). Larval planktotrophy—a primative trait in the Bilateria? Acta Zoologica, 76 (2), 141–154., page 143: Webbprotoconch (= initial chamber) of Nautilus, goniatites, and ammonites the ‘‘siphonal coecum’’, which is today com-monly known as the ‘‘caecum’’. Only 2 years later, Munier-Chalmas (1874) conﬁrmed a caecum in the proto-conch of living Spirula. Present experts widely agree that the usually non-mineralized caecum belongs to the

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WebbThe phrase apical whorls, or protoconch, means the whorls of the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch. The space under the apex of a patellate gastropod is called the apical cavity. c. Aperture [edit edit source] WebbA protoconch is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. The …

A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell which occurs in some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. In older texts it is also called "nucleus". The protoconch may sometimes consist of several whorls, but when this is the case, the whorls show no growth lines. Webbprotoconch (English) Origin & history. proto-+ conch. Noun. protoconch(pl.esorprotoconchs) (zoology) The embryonicshell, or first chamber, of …

Webbprotoconch Define Relate List Discuss See Hear Love Definitions from The Century Dictionary. noun The embryonal or primitive shell of an ammonoid cephalopod. Owen. … WebbMeanings for protoconch Add a meaning Cancel. Thanks for contributing. You are not logged in.. Please Log in or Register or post as a guest. Submit. Synonyms for protoconch Add synonyms ...

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WebbProtoconch — A protoconch (meaning first or earliest or original shell) is an embryonic or larval shell of some classes of molluscs, e.g., the initial chamber of an ammonite or the larval shell of a gastropod. The protoconch may sometimes consist of … reflective ceiling lightWebb31 juli 2024 · Protoconch unknown due to all specimens having corroded apex. Only three to four whorls remain on most specimens. Whorls highly elevated, slowly expanding. The posterior of periphery marked by strong axial ribs numbering 10–12, three spiral ribs present but only distinct on early whorls, becoming obsolete on adult shells. reflective characteristicsWebb(n) protoconch The embryonal or primitive shell of an ammonoid cephalopod. Owen. Also called embryo-sac, oviccll, and ovisac. (n) protoconch The apical whorl of a gastropod … reflective christmas car magnetsWebb1 apr. 2007 · The complete ontogenetic development (protoconch to adult) of the ammonite Salinites grossicostatum is outlined by a detailed morphometrical shell analysis, ... Uppermost Devonian ammonoids from Oklahoma and their palaeobiogeographic significance. R. T. Becker, R. Mapes; Environmental Science, Geography. reflective characterWebbпродиссоконх (рудиментарная раковина двустворчатого моллюска) * * * продиссоконх reflective christian musicWebbMeanings of the word Protokonch - پروٹوکونچ in English is protoconch. To understand how would you translate the word Protokonch - پروٹوکونچ in English, you can take help from words closely related to Protokonch - پروٹوکونچ or it’s English translations. reflective ceiling tilesWebbThe phrase apical whorls, or protoconch, means the whorls that constitute the embryonic shell at the apex of the shell, especially when this is clearly distinguishable from the later whorls of the shell, otherwise known as the teleoconch. Comparison of the apical part and the whole shell of Otukaia kiheiziebisu: reflective cinch strap