Americoliva spicata spicata (Röding, 1798)

Onglets principaux

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Americoliva spicata spicata

General description:

Distribution: Temperate Northern Pacific realm, Warm Temperate Northeast Pacific province. Cortezian ecoregion (Sea of Cortez). Tropical Eastern Pacific realm. Tropical East Pacific province. Panama Bight ecoregion (Panama).

RV 7308. Panama, Archipelago de Las Perlas, Isla Bajo Boyarena, at low tide in sand. Scale bar is 1 cm.

RV 3058. Panama, Cebaco Island; sand bar at low tide; April 1980. Scale bar is 1 cm.

Specimens from southeast Baja California Sur, Mexico (Cortezian ecoregion) are commonly assigned to Oliva melchersi Menke, 1851, (either as a subspecies or as a local variety). Apart from the rather arbitrary assignation (the taxon was described without figure), the differences in shell morphology are minor.

RV 1103a-b. Mexico, Baja California Sur, Bahia Conception; depth 3 m. Scale bar is 1 cm.

Dark brown coloured specimens, which occur uncommonly among regularly coloured specimens, have been named Oliva oniska Duclos, 1844, Oliva fuscata Marrat, 1871, and Oliva spicata var. perfecta Johnson, 1911.

lun, 2014-11-10 16:55 -- ron_voskuil
Porphyria spicata

Original description(s):

No formal description. Refers to Martini, 1773: Pl. 48 figs. 509-510.

sam, 2015-08-22 08:01 -- ron_voskuil
Oliva oniska

Original description(s):

To be added.

dim, 2015-05-17 09:19 -- ron_voskuil
Oliva araneosa

Original description(s):

"O. Cylindraceo-acuta, fulva, obsolète undata; lineolis nîgris tenuissimis transversis; ore albo. Espèce rare, remarquable par ses couleurs, et qui devient assez grande. C'est une coquille cylindracée, pointue au sommet, et d'une couleur rousse, obscurément ondée de jaune fauve. Elle offre une multitude de linéoles transverses, d'une finesse extrême, et qui imitent des fils de toile d'araignée. Son ouverture présente une couleur blanche. Dans la jeune coquille, les ondes en zigzags sont plus apparentes, et les linéoles transverses le sont moins. Longueur environ 65 millimètres.". Refers to Bruguière, 1798: Pl. 363 fig. 1 (A); Martini, 1773: Pl. 48 figs. 509-510 (B). Recent. No locality given.

A.

B.

dim, 2015-05-17 08:52 -- ron_voskuil
Porphyria arachnoidea

Original description(s):

No formal description. Refers to Martini, 1773: Pl. 48 figs. 509-510.

Taxonomy:

Junior objective synonym, by page preference, of Porphyria spicata Röding, 1798.

dim, 2015-05-17 08:48 -- ron_voskuil
Oliva melchersi

Original description(s):

"Ol. testa cylindrico-fusiformi, supra medium obtuse angulata, abhinc ad apicem acute conica; cinereo-carnea, maculis triangularibus transversis ochroleucis varia, punctis brunneis passim interspersis; anfractu ultimo ad suturam lineis fuscis fasciculatim digestis ornato; spirae anfractibus infra carneis unicoloribus, supra ad suturam fusco maculatis; labro acuto, intus vitta fusca nigro maculata marginato; columella basi longitudinaliter plicata, supra nuda; apertura intus livescente. Long. 15, lat. ad ang. 8, long, apert. 12 lin. In der Duclos'schen Monographie dieser Gattung habe ich keine Figur aufgefunden, welche unsere Art darstellte.Sie gehört in die Gruppe der cylindrischen Arten und ist zunächst mit Ol. venulata verwandt, von der sie sich durch ein weiter vorgeschobenes Gewinde, die Kante an der oberen Hälfte des letzten Umganges und lebhaftere Farbe unterscheidet; vielleicht bietet jedoch jene Kante nur eine Abweichung oder Deformität dieser Art, wie solche auch bei anderen Arten dieser Gattung vorkommt, dar. Sie ist auch mit Ol. tisiphona, polpasta und flammulata verwandt; letztere ist schmaler; polpasta ist breiter, schwerer, anders gezeichnet; tisiphona hat die Spindel bis oben hinauf mit Falten bestzt. Keine dieser Arten bietet die stumpfe Kante oben am letzten Umgange dar. Sie mag daher eine eigenthümliche, bislang unbeschriebene Art sein. Sie hat 6 Umgänge; ihre Spindel ist weiss, mit einem leichten Scheine in das Bläuliche.". Recent. Mazatlan, Mexico.

dim, 2015-05-17 08:11 -- ron_voskuil
Oliva fuscata

Original description(s):

"O. Melchersi similis, minor, subturbinata, labio postice subangulato; columella postice violacea, laevigata, callo antico angusto plicis perobliquis. Smaller and slightly more angular than O. Melchersi, with the same markings and colour in the different varieties. Neutral part of the columella smooth and violet; anterior callus narrow, with very oblique folds.". Recent. California.

Type material:

Syntype ANSP 15899. California. Ex Marrat Collection, 1875 (ANSP, 2013).

dim, 2015-05-17 08:03 -- ron_voskuil
Oliva spicata var. perfecta

Original description(s):

"Brown examples of the typical spicata might bear the name perfecta". Recent.

mer, 2015-04-29 15:04 -- ron_voskuil
Oliva intertincta

Original description(s):

"O. t. forma "Melchersi" simulante: sed multo minore; anfr. iii. nucleosis porcellanis, apice planato; iv. normalibus, spiru subelevata; inter trientem et dimidium totius longitudinis obscure angulato; spira parum callosa; superficie alba, castaneo sparsim tenue maculata, interdum lineis irregularibus confluentibus; labro intus ad marginem castaneo-fusco variegata; pariete denticulata; plicis columellaribus omnibus castaneis. More than a score of specimens were found agreeing in the above particulars, and not according with the young of any of the other species; of which however it may ultimately prove to be a variety. It has the shape of O. Melchersi, but differs in the dentition of the inner lip, and in the chestnut stain on all the plaits, not on all but one as in O. venulata. ... Long. .78, long. spir. .2, lat. .37, div. 70°.". Recent. Mazatlan, Mexico.

ven, 2015-02-06 11:30 -- ron_voskuil