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Embryonic or larval shell of some molluscs
A protoconch (meaning first or earliest or original shell of a gastropod) is an embryonic or larval shell which occurs in some classes of molluscs, e.g
Protoconch
Species of gastropod
shells show a long tower-shaped protoconch or embryonic shell of 5 whorls, which is usually lost in the adult. This protoconch is about 2.5 cm long and looks
Syrinx_aruanus
Complete revolution in the shell of a mollusc
the shell Protoconch—a larval shell of a mollusc; also refers to protoconch whorls of an adult shell Teleoconch—whorls beyond the protoconch Nepionic whorls :
Whorl_(mollusc)
Part of the body of a gastropod or snail
whorls known as the protoconch, which is often quite distinct from the rest of the shell and has no growth lines. From the protoconch, which forms the apex
Gastropod_shell
Novel characteristic of larval gastropods
Trochophore of Haliotis asinina with calcified protoconch (pc) prior to torsion.
Torsion_(gastropod)
Adult shell of molluscs
"adult" shell, as opposed to the protoconch, which is the embryonic or larval shell. The point where the protoconch ends and the teleoconch begins is
Teleoconch
Extinct, squid-like, Mesozoic cephalopods
consisted of an ovoid protoconch and several chambers. The protoconch had two layers, and several compartments—called "protoconch pockets"—formed between
Belemnitida
Possible simple urbilateran candidate
organism inside a tube secreted from the embryonic form as a dome or protoconch, a semi-metamerism derived from the formation of mesoderm from the gastrovascular
Urbilaterian
Larval shell of a mollusk
etc.). (The homologous structure in gastropods (snails) is called the protoconch.) The prodissoconch is often but not always smooth, and has no growth
Prodissoconch
Common name for snails that normally live in saltwater
planispirally coiled and are usually helicoidial, forming a spire with the protoconch preserved at its apex. The following cladogram is an overview of the main
Sea_snail
Species of gastropod
molecules. In this way the larval shell (protoconch) is formed. The construction of the haliotid protoconch is complete following torsion. These structures
Haliotis_asinina
Extinct order of molluscs
slim, conical shell with a large living chamber, simple aperture. The protoconch (initial, embryonic chamber) is egg-shaped and separated from the phragmocone
Aulacocerida
Fossil order of cephalopods
more primitive nautiloids by the small size and globular shape of the protoconch, the so-called embryonic shell. Nautiloids have relatively large embryonic
Bactritida
Species of gastropod
end of the protoconch. It is also strongly sculptured (mamillated), and at the end of the protoconch oblique striae can be seen. The protoconch is irregularly
Alycaeus_rolfbrandti
Genus of gastropods
family Pyramidellidae. These marine gastropods have shells with intorted protoconchs. Little is known about the biology of the members of this genus. As is
Oscilla_(gastropod)
Species of gastropod
having 1.5 whorls (repeating spirals or circles) when it is a protoconch. The protoconch is finely pitted and granular and collectively radiates from the
Angustopila_dominikae
Part of a mollusc shell
on the page. The spire, when it is not damaged or eroded, includes the protoconch (also called the nuclear whorls or the larval shell), and most of the
Spire_(mollusc)
Part of the shell of a mollusk
or protoconch is situated, if that is still present in the adult shell (often it is lost or eroded away). The phrase apical whorls, or protoconch, means
Apex_(mollusc)
Genus of gastropods
towards the apex. The shell cross-section is elliptical to triangular. The protoconch is distinct and globular or elliptical, often bearing a spine at its tip
Clio_(gastropod)
Species of gastropod
Anatomidae. The generic position is uncertain: Anatoma or Thieleella (protoconch sculpture unknown) The size of the shell varies between 2 mm and 3 mm
Anatoma_maxima
Genus of gastropods
Chrysallidinae, a large taxon of minute marine gastropods with an intorted protoconch. Dall & Bartsch (1904: 10) misinterpreted this genus and described it
Trabecula_(gastropod)
Species of gastropod
thirteen whorls. These are of a dull ashen color and unpolished surface. The protoconch is missing. The succeeding whorls are transversely sculptured by twelve
Hindsiclava_polytorta
Species of sea snail
somewhat turreted spine. It contains 9 whorls. The 2½ whorls of the protoconch are nearly smooth, regular, convex and chestnut-colored. The subsequent
Pleurotomella_packardii
Clade of gastropods
snails, is primarily characterized by a shell which has a heterostrophic protoconch, in other words the apical whorls are coiled in the opposite plane to
Heterobranchia
Species of gastropod
consisting of two whorls. The protoconch has fewer than one whorl, transitioning seamlessly into the teleoconch. The protoconch features a prominent broad
Ammonicera_consilii
Species of sea snail
Conus leekremeri Shell and protoconch of Conus leekremeri (specimen at the Smithsonian Institution) Conservation status Data Deficient (IUCN 3.1) Scientific
Conus_leekremeri
Family of gastropods
Desmopteridae. The species are protandric hermaphrodites. There is no shell, no protoconch and no longer any supporting tissue. The body consists almost completely
Desmopteridae
Species of gastropod
Typhlodaphne purissima Original drawing of a shell with protoconch and operculum of Typhlodaphne purissima Scientific classification Kingdom: Animalia
Typhlodaphne_purissima
Species of gastropod
proportions and somewhat variable in sculpture. It is thin, white, with a dark protoconch, a rather acute spire, a short columella and rather wide aperture . The
Gymnobela_blakeana
Species of terrestrial gastropod from Brazil
reddish-ochre color and a characteristic pale subsutural band and darker protoconch. Anatomically, it is notable for a long convoluted penis with two flagella
Megalobulimus_dryades
Species of gastropod
towards the base. The spire is short, conical, rounded and has an obtuse protoconch. It is composed of 4 whorls, separated by a barely visible suture under
Volvarina_ameliensis
Subgenus of gastropods
small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except
Conus_(Phasmoconus)
Species of gastropod
white at the extremity. The shell consists of eight whorls. The three protoconch whorls are smooth and convex. The rest are a little convex at the sides
Vexillum_bipartitum
Genus of gastropods
that typically measure in the adult state 1 mm or even less in size. The protoconch is characterized by distinct ridges and grooves. The teleoconch typically
Ammonicera
Species of gastropod
nitens range from 7 to 17 mm in length. The species has a multispiral protoconch, a relatively long aperture, and a smooth shell surface except for spiral
Cosmioconcha_nitens
Species of gastropod
significance in the United States. The snail has a bulbous, large, and broad protoconch, with a white or bluish-white columella, parietal wall, and outer lip
Archachatina_marginata
Species of gastropod
The first three whorls form, at the posterior end, a small mamillate protoconch. The body whorl constitutes almost the entire length of the shell. The
Volvarina_bazini
Genus of gastropods
Ebala are small (<4 mm) gastropods, the shells of which have a sinistral protoconch. The shell is transparent, sometimes with opaque spots. In contrast to
Ebala
Family of gastropods
(Palaeo-Caenogastropoda; Mollusca) from the Triassic to the Recent characterized by protoconch morphology - including the description of new taxa". Freiberger Forschungshefte
Batillariidae
Species of sea snail
white, with a chestnut-brown protoconch. The shell contains six somewhat convex whorls with a suture well-marked. The protoconch is composed of four whorls
Lusitanops_bullioides
Species of gastropod
micro-shagreened, covering all whorls except for 1–1.5 protoconch whorls. The diameter of the first protoconch whorl is 0.92–1.06 mm (mean 0.98 mm, n = 5). The
Amalda_fuscolingua
Species of gastropod
Shell showing posterior end, with spire and protoconch, and right side of the shell
Cypraecassis_rufa
Species of gastropod
The protoconch is paucispiral, comprising about 1.5 evenly rounded, bulbous whorls of a light brown color. The posterior part of the protoconch and the
Leucosyrinx_schepmani
Species of gastropod
elongate-fusiform shell consists of 6+1⁄2 whorls, including the blunt protoconch, which merges into the spire insensibly. The first whorl and a half are
Austrodrillia_dimidiata
Species of gastropod
this broken shell may have been 12 mm long. The holotype consists of the protoconch and two subsequent whorls. This marine species occurs off Natal, South
Daphnella_phyxelis
Clade of molluscs
modern coleoids, rather than the K-selected strategy of the nautilus. The protoconch, or initial chamber, lacks a cicatrix, a scar left by the original organic
Neocephalopoda
Species of gastropod
first protoconch whorl measures between 0.88 and 0.94 mm (mean 0.91, n = 5). The primary spire callus is thick, covering all but the protoconch and one
Amalda_aureomarginata
Extinct order of molluscs
ancestor. The pseudorthocerids are thought to be distinct because their protoconch and septal necks significantly different than orthocerids. Orthocerids
Orthocerida
Class of molluscs
sediment as the snail crawls. The larval shell of a gastropod is called a protoconch.[citation needed] Most shelled gastropods have a one piece shell (with
Gastropod
Species of sea snail
spire white with evenly-spaced, dark brown, crescent-shaped flammules; protoconch and early whorls yellow; interior of aperture white with 2 brown bands
Conus_kirkandersi
Species of gastropod
with about 12 spiral rows of somewhat squarish brown dots. The large protoconch is tan. The aperture of the shell is almost 3/4 of the length of the shell
Scaphella_junonia
Species of gastropod
exhibit partial brown coloring on the upper whorls (specifically the protoconch and first teleoconch whorl) or a single subsutural brown spot just before
Alvania_internodula
Extinct species of gastropod
in the Waikato Region, New Zealand. The species has a small shell, a protoconch with five whorls with a lightly margined suture. The shell has eight whorls
Austroclavus_awakinoensis
Species of gastropod
description) The shell is minute, solid, conical, and imperforate. The protoconch is dome-shaped, consisting of 1 1/2 whorls, and is sculptured with about
Amphithalamus_ornatus
Extinct class of molluscs
Rostroconchs began their life as a small, bilaterally symmetrical, univalved protoconch planktonic larva. The bilateral shell grew into two valves as the rostroconch
Rostroconchia
Extinct species of gastropod
Pyrgospira ostrearum (Stearns, 1872). The spire is acute with 2 whorls in the protoconch followed by seven subsequent whorls. The 2 earlier whorls show well-marked
Crassispira_calligona
Species of gastropod
translucent white and is polished. The shell contains four whorls. The protoconch is minute, subglobular and transparent. The suture is distinct, more or
Acteocina_infrequens
Species of gastropod
rounded shoulder. The suture is somewhat impressed, and rather oblique. The protoconch is relatively big, with a blunt apex, so that it appears to be obtuse
Curtitoma_ovalis
Genus of gastropods
tentacles, proportionally smaller heads and snouts, teleoconch-parallel protoconch coiling axis, thinner, longer, spineless egg casings, taller shell spires
Recluzia
Species of gastropod
has a broadly conic shape. Its color is dull brown. (The whorls of the protoconch are decollated). All but the last whorl of the fourteen whorls of the
Pyramidella_mexicana
Subgenus of gastropods
small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except
Conus_(Monteiroconus)
Species of gastropod
with F. levicula, but differs in its pronounced spiral cords and larger protoconch. It differs from F. minirosea in its more spinose and distant axial varices
Favartia_paulmieri
Species of gastropod
Buccinidae but differ in having a distinctive protoconch morphology with striking semilunar axial riblets. The protoconch is the embryonic or larval shell that
Amiantofusus_cartilago
Subgenus of gastropods
small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except
Conus_(Cylinder)
Subgenus of gastropods
small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except
Conus_(Kalloconus)
Species of gastropod
shell is small and cone-shaped made of two swirls, called the protoconch. On this protoconch there are fine lines very close to each other. The opening of
Struthiolaria_papulosa
Species of gastropod
family Columbellidae, the dove snails. The length of the shell (without protoconch) attains 15 mm, its diameter 10 mm. (Original description) The shell has
Anachis_gracilis
Genus of gastropods
deep water in the northeastern Atlantic It has a smooth or almost smooth protoconch. Tjaernoeia exquisita (Jeffreys, 1883) - described from Crete, also known
Tjaernoeia
Species of gastropod
Veprecula hedleyi Shell and protoconch of Veprecula hedleyi Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass: Caenogastropoda
Veprecula_hedleyi
Species of sea snail
The shell is minute, highly polished, and milk-white. The whorls in the protoconch number a little more than one; they are smooth and well rounded. The nine
Mirarissoina_histia
Species of gastropod
Abyssochrysidae. Shell large, solid, slender consisting of 15 whorls. Apex (protoconch and an indeterminate number of early teleoconch whorls) corroded. Early
Abyssochrysos_bicinctus
Species of gastropod
reach the base and the inner side of the outer lip is without denticles, protoconch is paucispiral. Amati, Bruno; Taviani, Marco; Oliverio, Marco (2024-03-27)
Alvania_ismar
Species of gastropod
last whorl. The shell structure is divided into distinct sections. The protoconch (the embryonic shell) consists of about two whorls and is nearly smooth
Alycaeus_goliath
Species of gastropod
family Rissoidae. The length of the shell attains 1 mm. This species has a protoconch with a spiral design. This species occurs in the Caribbean Sea off Aruba
Alvania_moolenbeeki
Species of gastropod
horn to white in some specimens at the point where the whorls of the protoconch and the teleoconch join. In some other specimens the change is continued
Olivella_nana
Species of gastropod
mm. Said shells are easily identifiable by their "multispiral, conical protoconch." The Murex hirasei Dautzenburg was originally discovered in 1915 by Philippe
Vokesimurex_hirasei
Species of gastropod
Clavatula debilis The shell and the protoconch of Clavatula debilis Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Gastropoda Subclass:
Clavatula_debilis
Species of gastropod
Phasianellidae. The size of the shell varies between 8 mm and 32 mm. Protoconch is smooth and the shell is brilliant, long, thin and turban-shaped, usually
Phasianella_solida
Genus of gastropods
columella is somewhat swollen, sometimes showing a pleat. The paucispiral protoconch consists of 1 to 3 conical or globose whorls, smooth or with faint spiral
Bathytoma
Species of sea snail
of the body whorl is flattened, and the shoulder is subangulate. The protoconch is pointed, 0.4 mm in height and 0.6 mm in width. It contains three whorls
Conus_brandonensis
Subgenus of gastropods
small operculum. The shoulder of the shell is usually nodulose and the protoconch is usually multispiral. Markings often include the presence of tents except
Conus_(Lividoconus)
Clade of sea snails
of California Press, 331–383. Bandel, K. & Dockery, D.T. III (2012): Protoconch characters of Late Cretaceous Latrogastropoda (Neogastropoda and Neomesogastropoda)
Neogastropoda
Species of gastropod
The body whorl is bicarinate and spirally lirate. The sculpture of the protoconch is smooth, while the subsequent whorls feature rather distant, narrowly
Austrofusus_acuticostatus
Genus of cephalopods
ridge on the dorsal surface. The phragmocone (internal shell) has a small protoconch at its tip, and fit into the cavity and the guard. It also had septa and
Belemnitella
Species of gastropod
1-2 of which visible on the inner whorls, in particular towards the protoconch the second one becomes distinctly separated from the suture; shell yellow-brownish
Ammonicera_arrondoi
Species of sea snail
corneous shell of C. fuscoflavus is smooth and thick; indistinct suture; protoconch and spire composing a fraction of the shell length. The majority of the
Conus_fuscoflavus
Extant subclass of cephalopods
attachment types. Other traits referenced during this reclassification include protoconch morphology, connecting ring structure, and the extent of cameral and endosiphuncular
Nautiloid
Species of gastropod
a "candy‑stripe" pattern. The protoconch is usually whitish or pale, but occasionally it is almost black. The protoconch is typical for the subfamily Umboniinae
Ethminolia_hickmanae
Species of gastropod
bulb of the protoconch is opaque white. In some individuals the yellow colour may fade post mortem to a pale apricot‑brown. The protoconch is as in Tylorhaphe
Tylorhaphe_wallacei
Species of gastropod
The shell contains six rounded whorls and a very minute (decorticated) protoconch. The suture is distinct and not appressed. The spiral sculpture consists
Colus_barbarinus
Species of gastropod
shell consists of 5 whorls, including a blunt protoconch of 2 convex whorls,. These whorls in the protoconch are apparently smooth, but microscopically minutely
Mitromorpha_paucilirata
Species of gastropod
terminate in a short, open, and recurved siphonal canal. Sculpture: the protoconch is smooth, while the succeeding whorls bear low, rounded radial ribs.
Austrofusus_pagoda
Species of gastropod
ramp of spire whorls, body whorl bi-angulate, teleoconch of 5 Whorls, protoconch of 1½ smooth embryonic whorls. Sculptured with elevated and angulate axial
Austromitra_lacertosa
Clade of gastropods
of Neogastropoda. Fossils recognizable as latrogastropods due to their protoconch are known as far back as the Aptian stage of the Cretaceous. Tonnoidea
Latrogastropoda
Species of gastropod
The protoconch is small, paucispiral, and composed of approximately 1.75 evenly convex, rounded whorls, light brownish in color. The protoconch–teleoconch
Leucosyrinx_urbanae
Species of gastropod
or less eroded, and showing the iridescent green nacre at the tip. The protoconch is conical, small, acute, and consists of 2½ convex smooth and pinkish-brown
Cantharidus_opalus
Species of sea snail
with irregular, darker grey and/or green bands on exposed surfaces. Protoconch opaque white, surface rough, lacking strong sculpture, of approximately
Haliotis_pirimoana
Species of gastropod
lines, elevated. The shell contains three whorls. The only whorl of the protoconch is very minute, the others are rapidly increasing. The body whorl is very
Acremodontina_translucida
Species of gastropod
shining, variable in colour. The spire with 4 weakly convex whorls; protoconch smooth, not marked off; sutures weakly incised, false margined; body whorl
Eatoniella_bathamae
Species of gastropod
colour, with narrow ochraceous bands below the suture. It has a rounded protoconch, and it is without any perceptible sculpture except for a few faint growth-lines
Angustassiminea_vulgaris
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