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Species / Arrhoges Occidentalis

Arrhoges Occidentalis

Stromboidea


Original Description of Rostellaria occidentalis by Beck, 1836:

  • "R. testa livido-plumbea, turrita, spiraliter tenue-striata, anfractibus convexis longitudinaliter oblique costellatis; labro alato, mutico, intus albo."
    • the above description is cited by Beck, 1836 as coming from "Beck., in Lyell Catal. of the Fossils of St Laurence-Bay in Geol. Trans.", which is fide Johnson, 1930 published in 1841 as "Trans. Geol. Soc, London, vol. 6, (2 ser.) 1841 (read April 24, 1839), Remarks on Some Fossils and Recent Shells collected by Captain Bayfield R. N. in Canada," by Charles Lyell."

Beck, 1836 adds a second description:

  • "Testa crassa, sed laevis, opaca , oblongo-alata , depressiuscula, subdistorta, spira elongato-conica, anfractibus 8 1/2 regulariter accrescentibus, convexis, ad suturam impressam paululum coarctatis, testae axim versus sub angulo patulo (graduum circiter 110°) inclinatis. Anfractus infantiles 2 1/2 laevigati; caeteri costis longitudinalibus dextrorsum arcuatis, suturas vix attingentibus, elevatiusculis, rotundatis (in perultimo anfractu circiter 25) ornati, striisque confertis et aequali fere spatio remotis, spiralibus exarati. Ultimus anfractus spira paululum brevior, posterius valde convexus, costisque longitudinalibus obsoletioribus, ante medium evanescentibus, ornatus; anterius oblique attenuatus, subacuminatus, dextrorsum in labrum sat magnum alatforme continuatus, supra striis spiralibus, ad labrum extremum divergentibus, exaratus. Labrum oblique quadrilaterale, posterius late excisum, lobo baseos supra anfractum penultimum decurrente, ad angulum externum protractum, subuncinatum, margine exteriore truncatum, valde incrassatum, angulo superiore obtuso rotundato, margineque anteriore oblique excisa, compressiuscula in apicem columellae abreviato-rostratum dextrorsum inclinatum, continuatum, superne ruga una alterave antiquatum, inferne et interne laevissimum. Apertura oblonga, augustiuscula, subquadrilateralis, posticè ad columellam acuminata, vix canaliculata, anticè in fissuram obsoletam, canalis ad instar, continuata, laevissima. Columella obliqua, posterius subconvexa, medio excavata, subarcuata, antrorsum oblique subulatim producta, aspice obtuso, supra indumento subcalcareo polito tecta, fissura umbilicali longitudinali obsoleta. Color testae extus explumbeo griseus, vel sordide albus, raro in fuscum vergens: apertura intus plumbeo-caerulescens, columella labroque candidis. Epidermis fuscescens, opaca."

Locus typicus: "Oc. atlanticum americanum, in sinu Sancti-Laurentii, et ad insul. Terrae-Novae. Frustula spirae etiam e Groenlandia nobis allata." (Beck, 1836)

Rostellaria occidentalis Beck, 1836, pl. 72

Measurements

  • "The shell described and figured by Beck is 57 mm. in length, diameter of the penultimate whorl 15 mm., width of the lip 20 mm. The last whorl has about 25 longitudinal costae." (Johnson, 1930)

Comment Beck, 1836: "Description and drawing are produced from a shell from the collection of M. Petit de la Saussaye in Paris. The shell was collected by M. Le Vicaire."


History and Synonymy

Arrhoges occidentalis (Beck, 1836:7 (unnumbered) pl. 72) [as Rostellaria occidentalis]

  • Syn.: Aporrhais occidentalis labradorensis Johnson, 1930: 133
  • Syn.: Aporrhais occidentalis mainensis Johnson, 1926: 3, pl. 1, fig. 2,3
  • Syn.: Arrhoges occidentale Orlov, 1960 : 191 [incorrect subsequent spelling]
  • Syn.: Chenopus occideutalis Beck, 1847. Orlov, 1960: 189 [incorrect subsequent spelling]
  • Syn.: Drepanocheilus (Arrhoges) occidentale Beck, 1836. Wenz, 1938 : 912, pl. 2680

1841

Rostellaria occidentalis in Gould, 1841, fig. 205

  • Complete shells are found in fishes taken in Newfoundland Banks.
  • Gould, 1841 did not know the animal.
  • Because of its simple expansion, Gould, 1841 placed it close to Hippochrenes macroptera, the shell seemed to him close to Aporrhais pespelecani

Comment Johnson, 1926, p. 134: "The figure by Gould represents this variety [A.o. mainensis]. It was found by Mr. Bryant 20 miles E.S.E. of Cape Sable, N. S., in 70 fms."

Comment Johnson, 1930, p. 3: "The figure by Gould represents the typical form [of Arrhoges occidentalis] and not this variety [A.o. mainensis] as stated in 1926."

1842

Aporrhais occidentalis in Sowerby, 1842, pl. V, fig. 2

1843

Rostellaria occidentalis in Kiener, 1843, pl. ?, fig. 4

1851

Rostellaria occidentalis in Reeve, 1851, Rostellaria, pl. 2, fig. 6 a, b

1863

Packard, 1863:

  • p.421: "...Invertebrata collected at Anticosti and Mingan Islands, by Messr. A.E. Verrill, A. Hyatt, and N.S. Shaler, in 1861 ... (p. 423) ... Aporrhais occidentalis Beck. ..."
  • p. 426: "Aporrhais occidentalis occured very rarely at Gaspé, as it does on the coast of Maine."
  • p. 427: "... and the following species are characteristic of Labrador and the Banks of Newfoundland: ... Aporrhais occidentalis ..."
  • p. 428: "Thus with our present knowledge we can approximate very nearly to the southern limits of this shoal fauna, and trace the isolated patches situated upon the cold and unprotected elevations, which rise in the warmer seas of New England; but our imperfect information respecting the range northward of its most characteristic species, does not allow us to speak with much certainty how far up the eastern coast of Labrador these species extend, or whether those few species, which reach Greenland and occur there rarely, may not be considered as foreigners to the soil. For example: of Apporhais occidentalis, which is so profusely abundant in the Straits of Belle Isle, Mörch reports but a fragment from Greenland."

1874

Aporrhais occidentalis in Tryon, 1873, pl. 10, fig. 125

1926

Original description of Aporrhais occidentalis mainensis n.var. by Johnson, 1926, p. 133:

  • "The specimens from Gulf of Maine and Bay of Fundy differ from the typical form from the Gulf of St. Lawrence northward, in having fewer and more elevated longitudinal costae. The type calls for 25 costae, while those from the Gulf of Maine have only 14 on the penultimate whorl, the number being quite constant, while those from Labrador have from 22 to 25 costae. In the Gulf of Maine specimen the costae in the young end abruptly at the periphery and the peripheral line is noticable on the entire body whorl to the tip of the wing-like lip, there is also a slight sub-peripheral line; both of these are obsolete or wanting in the more northern specimens."

Comment Johnson, 1926, p. 134: "The variety is based chiefly on a large series dredged by Dr. C.W. Townsend in from 5 to 6 fms. near the Gillpatrick Ledge off Northeast Harbor, Maine."

1930

Johnson, 1930 about Aporrhais occidentalis var mainensis:

  • "The length of the type (fig. 5) is 62 mm. The type lot was dredged by Dr. C. W. Townsend near Gillpatrick Ledge, off Northeast Harbor, Maine, in 5 to 6 fathoms"

Original Description of Aporrhais occidentalis var. labradorensis n. var. by Johnson, 1930, p. 3:

  • "This is readily separated from the typical form by its smaller size, more slender spire, smaller and more numerous costae and less expanded lip. On the penultimate whorl there are about 24 longitudinal costae and on the body whorl about 29, peripheral lines obsolete or wanting. Width of the lip 15 mm. The lip is confined to the body whorl, usually not reaching the suture and rarely extending onto the penultimate whorl. The length of the holotype (fig. 3) is 52 mm. and of fig. 2, representing an unusually high spire. 63 mm. Holotype and paratypes are from Egg Harbor, Labrador, 7 fathoms (Owen Bryant). Most of the specimens from the Labrador coast are badly eroded."

Arrhoges occidentalis; Gaspe Bay, Canada; ex coll. Trechmann No. 2176, coll. BM(NH)

Arrhoges occidentalis labradorensis; Norwegian Sea (?), from Polish trawler; 52 mm; 1977; Coll. Rene Vanwalleghem


Localities

  • Gulf of St. Lawrence (A. occidentalis; Johnson, 1930)
  • Newfoundland (A. occidentalis; Johnson, 1930)
  • off the Isles of Shoal, New Hampshire by W.S. Schroeder, US Fish Commission steamer "Albatross II" in 88 fathoms (A. occidentalis; Johnson, 1930)
  • Georges Bank, Lat. 41° 23' N., Long. 68° 46' W. in 50 fathoms (A. occidentalis; Johnson, 1930)
  • off Gurnett Point, Plymouth, Mass. by R.K. Smith & W.F. Clapp in 20 fathoms (A. occidentalis; Johnson, 1930)
  • N.E. of the Island of Anticosti by J.F. Whiteaves in 120 fathoms (A. occidentalis; Johnson, 1930)
  • Gillpatrick Ledge, off Northeast Harbor, Maine, by Dr. C.W. Townsend, in 5 to 6 fathoms (A. occidentalis var. mainensis; Johnson, 1930)
  • Eastport, Maine, by Hyatt, in 20 fathoms (A. occidentalis var. mainensis; Johnson, 1930)
  • Digby, Nova Scotia, by E. W. Roper (A. occidentalis var. mainensis; Johnson, 1930)
  • Egg Harbor, Labrador, by Owen Bryant, in 7 fathoms (A. occidentalis var. labradorensis; Johnson, 1930)

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