198 research outputs found
Il deposito dei saperi di Morassi. L'archivio scientifico e la fototeca di Antonio Morassi presso l'Università Ca' Foscari di Venezia
No full textIllustrazione della struttura della Fototeca-Archivio Morassi, conservata presso Università Ca' Foscari, e delle connesse attività inventariali , catalografiche e conservative. In appendice documentaria si fornisce l'indice dei corrispondenti con Morassi, le cui lettere sono conservate nell'archivio
Cryptodaphne adiaphora Morassi & Bonfitto 2010, new species
No full textCryptodaphne adiaphora new species Figures 1. A–F Type material: Holotype MHNH 22300. Type Locality: Fiji SE Viti Levu, 18°00.0’ S 178°53.7’E, 1058–1091 m [MUSORSTOM 10 stn. CP 1361]. Material examined: only known from the holotype. Description: Shell narrowly biconic (b/l 0.41; a/l 0.45). Teleoconch consisting of 4.5 whorls separated by moderately deep, not channelled suture. Last whorl strongly excavated with short neck. Most whorl height occupied by a wide and nearly vertical sutural ramp. Subsutural fold moderately prominent, with its lower margin bordered by a narrow spiral cord. Spire whorls sculptured by a moderately prominent peripheral cord near lower suture of each whorl; a second weaker cord occurs on lower part of sutural ramp. Lower part of each whorl sculptured by two spiral cords, the lower much stronger, forming a peripheral keel; last whorl with two weak cords above peripheral keel and a second main cord just above lower suture. Last whorl with 13 widely spaced, narrow spiral cords on base and neck. Sutural ramp sculptured by sigmoid collabral threads producing minute plicules on subsutural fold. Under SEM, entire shell surface is seen covered by rows of spirally aligned granules. Aperture narrow, oblanceolate. Columella almost straight above, slightly curved to left below. Labial callus thin, sculptured by microscopic rows of prickly nodules in its interior part (fig. 1D). Siphonal canal relatively short, oblique, narrow. Outer lip thin; based on growth lines anal sinus moderately deep, reversed L-shaped anal sinus with its apex below middle of sutural ramp. Protoconch narrowly conical of 3.8 whorls; protoconch I partly missing, protoconch II sculptured by opisthocyrt axial riblets extending from suture to suture decussate by oblique threads on lower two-third of each whorl. Protoconch breadth: 0.52 mm. Teleoconch white, protoconch pale buff. Dimensions: Holotype 5.6 x 2.3 mm, aperture height 2.5 mm. Remarks: This is a typical representative of the genus Cryptodaphne. In its small size and shell outline, Cryptodaphne adiaphora resembles C. kilburni Morassi & Bonfitto, 2006, from which it differs in numerous details of sculpture. In C. adiaphora the spire whorls are sculptured by a prominent peripheral cord and a weaker cord on lower part of sutural ramp (figs. 1B–C); a second main cord develops just above lower suture on last whorl (fig. 1A). In C. kilburni the peripheral cord is barely stronger than other spiral elements and 3–4 cords occur below it on last whorl. Furthermore, C. adiaphora has much fewer collabral threads. Finally, the protoconch of C. adiaphora (fig. 1E–F) consists of nearly 4 whorls compared to 3.25 of C. kilburni. C. adiaphora differs from the fossil C. pseudodrillia Powell, 1942 in lacking secondary cords between main spiral elements (fide Powell 1942) and in having fewer protoconch whorls (nearly 4 vs 5). Etymology: Greek adiaphoros (not different, neutral), with reference to the morphological resemblance of this species to “typical” members of Cryptodaphne.Published as part of Morassi, M. & Bonfitto, A., 2010, New raphitomine gastropods (Gastropoda: Conidae: Raphitominae) from the South-West Pacific, pp. 54-68 in Zootaxa 2526 on page 5
Tropidoturris vizcondei Morassi & Bonfitto, 2013, sp. nov.
No full textTropidoturris vizcondei sp. nov. Figures 1. A–H Type material: Holotype (MNHN 26614). 4 Paratypes (2 from stn. CC 3175 (MNHN 26615); 1 from stn. CP 3143 (MNHN 26617); 1 from stn. CP 3133 (MNHN 26618); 1 (coated) from stn. CC 3175 (MZB 60071). Type locality: Mozambique Channel (Maputo transect), 25 ° 34 ’S 34 ° 11 ’E, 155– 165 m. Material examined: Mozambique Channel (Maputo transect): 25 ° 34 ’S 34 ° 11 ’E, 155– 165 m. [N/O “Vizconde de Eza” MAINBAZA, stn. CC 3175] (holotype and 3 paratypes); 25 ° 11 ’S 35 ° 10 ’E, 200– 201 m. [N/O “Vizconde de Eza” MAINBAZA, stn. CP 3133] (1 paratype); 23 ° 32 ’S 35 ° 46 ’E, 264– 277 m.[N/O “Vizconde de Eza” MAINBAZA, stn. CP 3143] (1 paratype). Description: Shell (fig. A–C) fusiform-biconic (b/l 0.37–0.39; a/l 0.49–0.54), with a high spire; base tapering, shallowly excavated. Protoconch of 1 ½ strongly convex whorls (fig. F–G) with a series of weak axial growth ribs at termination; under SEM (fig. H) the protoconch surface is seen to be sculptured by microscopic rows of spiral threads more evident on terminal part. Protoconch diameter: 0.75–0.90 mm. Teleoconch of up to 5 whorls sharply shouldered at mid-whorl height, sutural ramp broad, shallowly concave. First teleoconch whorl with a prominent peripheral cord; in some specimens a second weaker cord just below the peripheral one. Two prominent spiral cords on second whorl, increasing to 3 on antepenultimate and penultimate whorls (in some specimens with a fourth narrow spiral cord at level of abapical suture) (fig. D). Last whorl with 3–5 spiral cords; 11–14 cords on base and rostrum. Axial sculpture of fine to relatively prominent growth lines. No axial ribs. Under SEM (fig. E) the surface of sutural ramp and the interspaces, between spiral cords, are seen to be covered by microscopic rows of slightly wavy spiral threads. Aperture narrowly lanceolate, tapering slightly towards base, truncated posteriorly at sinus. Columella and parietal region weakly convex, columellar callus thin. Siphonal canal short, shallowly notched. Outer lip thin. Anal sinus deep, relatively broad, occupying entire sutural ramp. Color uniform pale orange-yellow. Dimensions: Holotype: 11.1 x 4.3 mm, aperture height 6.0 mm; largest paratype (CP 3143): 13.2 x 5.1 mm, aperture height 7.2 mm; smallest paratype (CC 3175): 9.7 x 3.8 mm, aperture height 4.8 mm. Etymology. Named after the research vessel “Vizconde de Eza” used in the dredging of the type material. Remarks. Tropidoturris vizcondei sp. nov. is comparable only to Tropidoturris simplicicingula simplicicingula (Barnard, 1958) and T. planilirata Kilburn, 1986 in the complete lack of axial sculpture, but otherwise differs distinctly from both species mainly in its smaller dimensions (up to 13.2 mm versus 19.8 in T. simplicicingula simplicicingula and 16.8 mm in T. planilirata), and in possessing fewer teleoconch whorls (up to 5 whorls versus 6 in T. simplicicingula simplicicingula and 5 ½ in T. planilirata) sculptured by fewer spiral cords. In particular, Tropidoturris vizcondei sp. nov. has 3–4 and 3–5 spiral cords on penultimate and last whorl respectively while T. simplicicingula simplicicingula and T. planilirata have respectively 6–10 and 4–5 spiral cords (excluding peripheral cord) on abapical part of penultimate whorl. Furthermore, T. planilirata has 1–2 spiral cords on sutural ramp which are totally absent in T. vizcondei. The shell of T. vizcondei is uniform pale orange-yellow while that of both T. planilirata and T. simplicicingula simplicicingula is more vividly patterned with brown blotches. Finally, in Tropidoturris vizcondei the anal sinus seems broader than in any of its described congeners.Published as part of Morassi, Mauro & Bonfitto, Antonio, 2013, Four new African turriform gastropods (Mollusca: Conoidea), pp. 271-280 in Zootaxa 3710 (3) on page 273, DOI: 10.11646/zootaxa.3710.3.5, http://zenodo.org/record/22015
Estimating area of inclusions in anisotropic plates from boundary data
No full textWe consider the inverse problem of
determining the possible presence of an inclusion in a thin plate
by boundary measurements. The plate is made by non-homogeneous
linearly elastic material belonging to a general class of
anisotropy. The inclusion is made by different elastic material.
Under some a priori assumptions on the unknown inclusion, we prove
constructive upper and lower estimates of the area of the unknown
defect in terms of an easily expressed quantity related to work,
which is given in terms of measurements of a couple field applied
at the boundary and of the induced transversal displacement and
its normal derivative taken at the boundary of the plate
Acamptodaphne solomonensis Morassi & Bonfitto 2010, new species
No full textAcamptodaphne solomonensis new species Figures 1. G–O Type material: Holotype MNHN 22301. Paratypes: 1 MNHN 22302, 1 MZB 45712, 1 ZRC 2978. Type locality: Solomon Islands, 08°21.4’S 160°41.8’E. Material examined: Solomon Islands: 08°21.4’S 160°41.8’E, 194–286 m [N/O “ Alis ” SALOMON 1 Stn DW 1768] (holotype, 1 paratype at MNHN and 1 paratype at MZB); 08°20.4’S 160°40.6’E, 290–303m, [N/ O Alis SALOMON 1 Stn DW 1769] (1 juv. paratype at ZRC). Description: Shell fusiform-biconic (b/l 0.44–0.47; a/l 0.49–0.53). Teleoconch consisting of 4.5–5.2 whorls sharply angulated at one-third of whorl height on earlier whorls; angulation slightly weaker and near middle on last two spire whorls. Last whorl strongly excavated with a relatively long neck. Whorls separated by a deep, narrowly channelled suture. Sutural ramp wide, shallowly concave. Axial sculpture consisting of short, prominent, opisthocline ribs, with wider interspaces, extending from lower suture to peripheral angle where they are abruptly truncated and form prominent tubercles. Penultimate whorl with 16–19 ribs; axial ribs weaker and restricted to periphery on last whorl, becoming obsolete on latter part of the whorl. Spiral sculpture commencing as a subsutural thread and a prominent cord, forming the peripheral angulation, joined on second whorl by a weaker cord anteriorly. On subsequent whorls, suture is margined by two threads forming a weak subsutural fold, while additional 1–2 spiral cords develop below the peripheral cord; interstices between cords with 1–3 spiral threads on last two whorls. Sutural ramp lacking spirals on first whorl, bearing 6–8 threads on later whorls. Base sculptured by 26–27 spiral elements consisting of cords and threads of variable strength. Whorls covered by dense, rough collabral growth lines particularly evident on sutural ramp where are weakly frilled and sinuous in conformity with the anal sinus in outer lip; growth lines forming small, axially elongate tubercles on subsutural fold and small nodules at points of intersections with spiral cords. Under SEM, entire shell surface is seen to be covered by spiral rows of microscopic granules. Aperture lanceolate. Columella nearly straight above, distinctly curved to left below. Labial callus thin, sculptured by microscopic rows of prickly nodules in its interior part (fig. 2L). Siphonal canal relatively long (for genus), oblique and relatively wide. Anal sinus moderately deep, broadly reversed L-shaped, with its apex below middle of sutural ramp. Protoconch domed of 1.5–1.8 whorls covered with minute, dense spiral threads rendered granulose where crossed by even finer axial threads; last whorl with a few close, arcuate, axial plicules near termination. Protoconch breadth: 0.43–0.56 mm. Teleoconch white, protoconch pale buff. Dimensions: Holotype 8.2 x 3.6 mm, aperture height 4.0 mm; largest paratype: 7.2 x 3.2 mm, aperture height 3.8 mm; smallest paratype: 5 x 2,6 mm, aperture height 2,8 mm. Remarks: This species is readily distinguished from its congeners in having a fusiform-biconic rather than biconic shell, with a strongly concave left side of the base, and a paucispiral protoconch (figs. 1N–O). Etymology: solomonensis refers to the fact that this species is described from Solomon Islands.Published as part of Morassi, M. & Bonfitto, A., 2010, New raphitomine gastropods (Gastropoda: Conidae: Raphitominae) from the South-West Pacific, pp. 54-68 in Zootaxa 2526 on pages 57-5
Stable determination of a rigid inclusion in an anisotropic plate
No full textIn this paper we consider the inverse problem of determining a rigid inclusion inside a thin plate by applying a couple field at the boundary and by measuring the induced transversal displacement
and its normal derivative at the boundary of the plate. The plate is made by non-homogeneous linearly elastic material belonging to
a general class of anisotropy. For this severely ill-posed
problem, under suitable a priori regularity assumptions on the boundary of the inclusion, we prove a stability estimate of
log-log type
A Procedure for Multiple Damage Identification in Elastic Beams
No full textThis paper concerns with the identification of multiple cracks in a beam by measurements of the damage-induced variations in the
static deflection of the beam under a prescribed load condition. Each crack is simulated by an equivalent linear elastic rotational
spring connecting the two adjacent segments of the beam. Sufficient conditions on the static measurements which allow for the
unique identification of the damage are presented and discussed for beams under various sets of boundary conditions. The analysis is
based on an explicit expression of the crack-induced variation in the static deflection of the beam. The present results are obtained by
non trivial extension of recent results given by the authors regarding the identification of a single crack in a beam by static tests
Acanthodaphne boucheti Morassi & Bonfitto 2010, new species
No full textAcanthodaphne boucheti new species Figures 3. A–H Type material: Holotype MNHN 22308. Paratypes: 1 MNHN 22309, 1 MZB 45715, 1 ZRC 2980. Type locality: Solomon Islands, 08°19.4’S 160°38.7’E, 194–286 m [N/ O Alis, SALOMON 1, stn. DW 1770]. Material examined: only known from the type material. Description: Shell biconic (b/l 0.39–0.44; a/l 0.40–0.44). Teleoconch consisting of up to 6.5 whorls which are strongly shouldered near middle on early two whorls, above middle on subsequent ones. Last whorl shallowly excavated with a short neck. Whorls separated by a weakly impressed suture margined by a prominent subsutural fold. Sutural ramp relatively narrow, strongly concave. Axial sculpture consisting of prominent opisthocline ribs of rounded triangular cross-section, extending from lower suture to shoulder angle, where they are abruptly truncated and form tubercles. Axial ribs rapidly fading over upper part of base on last whorl. There are 13–14 axial ribs on penultimate whorl, 17–19 on last whorl. Subsutural fold bearing a row of tubercles corresponding in number to axial ribs; in the holotype, which is the largest specimen, the tubercles becomes more numerous than axial ribs (about one and a half their number) on last two whorls. Sutural ramp sculptured by fine collabral threads sinuous in conformity with the anal sinus. Spiral sculpture consisting of low, flattened cords and threads. First whorl with a moderately prominent peripheral cord joined on subsequent whorl by a second cord anteriorly. Later two whorls with 3–4 primary cords; 1–2 secondary cords or threads occur in the interstices between main cords. Base sculptured by 9–11 widely spaced primary and secondary cords and 6–8 fine threads on the neck. Under SEM magnification, spiral cords are smooth, but their interstices and sutural ramp are covered by dense rows of granules. Aperture broad, oval. Columella nearly straight. Siphonal canal broadly open, poorly differentiated from aperture. Labial callus relatively thick over columella, wide, sculptured by microscopic rows of prickly nodules in its interior part (fig. 3F). Outer lip thin with a moderately deep, reversed L-shaped anal sinus; its deepest point below middle of sutural ramp. Protoconch conical of 3+ whorls; protoconch I missing, protoconch II sculptured by opisthocyrt axial riblets extending from suture to suture decussate by oblique threads on lower third of each whorl. Teleoconch white, protoconch yellowish-beige. Dimensions: Holotype 12.2 x 4.8 mm, aperture height 4.9 mm; largest paratype: 7.9 x 3.5 mm, aperture height 3.5 mm. Smallest paratype measures 7.4 mm in height and has a broken outer lip; smallest undamaged paratype: 7.7 x 3.4 mm, aperture height 3.3 mm. Remarks: Acanthodaphne boucheti is larger than any other described Acanthodaphne species. It further differs from A. sabellii in its higher spire, higher shoulder angulation on the teleoconch whorls (figs 3C–D), more numerous spiral cords and more numerous axial ribs (17–19 vs 14–16 on last whorl), which are markedly weaker on the last whorl. Furthermore, in Acanthodaphne boucheti the tubercles on the subsutural fold are relatively large and as numerous as the ribs or one and a half times their number (in the holotype), rather than twice their number as in A. sabellii. In this feature A. boucheti resembles Pseudoinquisitor ? cf P. ? pulchra (Schepman, 1913) figured by MacNeil (1960) but otherwise differential characters are the same as for A. sabellii. Etymology: This species is named after Philippe Bouchet of the MNHN in recognition of his substantial contributions to Malacology and for his generosity in making the material used for this paper available to us.Published as part of Morassi, M. & Bonfitto, A., 2010, New raphitomine gastropods (Gastropoda: Conidae: Raphitominae) from the South-West Pacific, pp. 54-68 in Zootaxa 2526 on pages 63-6
An asymptotic analysis of the flexure problem for thin tubes
No full textIn this paper, the author studies the Saint-Venant flexure problem for hollow, homogeneous, isotropic
cylinders with a thin multiconnected cross section. By using the framework of the Gamma-convergence of func-
tionals, the classical theory of Jouravski is shown to be the variational limit of the flexure problem when the
thickness of the wall goes to zero
Teretia sysoevi Morassi & Bonfitto, 2015, sp. nov.
No full textTeretia sysoevi sp. nov. Figures 1.L–T Type material. Holotype (MNHN IM- 2000-28375) and two paratypes (paratype 1 MNHN IM- 2000-28377 (coated); paratype 2 MZB 60096). Type locality. Wallis & Futuna Islands, 14 °19,6'S 178 °06,7'E, 419–425 m [MUSORSTOM 7 stn DW 507], 11 May 1992. Material examined. Wallis & Futuna Islands, 14 °19,6'S 178 °06,7'E, 419–425 m [MUSORSTOM 7 stn DW 507], 11 May 1992 (1 dd, holotype); New Caledonia: 18 °48,20’S 163 °10,80’E, 720 m [MUSORSTOM 4 stn DC 168] 16 September 1985 (1 dd, paratype 1); Loyalty Ridge: 23 ° 54.46 S 169 ° 49.15 E, 699–715 m [N/ O “Alis” BATHUS 3 stn DW 786], Bouchet, Richer & Warén coll. 25 November 1993 (1 dd, paratype 2). Description. Shell (Figs. 1.L– O) fusiform (b/l 0.39; a/l 0.38) with high spire, strongly excavated base and relatively short anterior canal. Teleoconch of five whorls (six in paratypes) with shallowly impressed, linear suture. Subsutural ramp wide, moderately deeply concave. Earlier two teleoconch whorls with a prominent peripheral cord below mid- height of the whorl and two weak cords bordering abapical part of subsutural ramp (the abapical one bisected). On third whorl a second main spiral cord develops at level of abapical suture increasing in strength on subsequent whorls (Fig. 1.P). In one paratype the second main cord develops from first whorl onwards. Last whorl with a third main spiral cord near abapical suture and one weak cord in the interspace between peripheral and second main cords. Last whorl with 19 spiral cords on base and rostrum. Subsutural ramp lacking spiral sculpture (holotype) or with up to four low threads (paratypes) on later two whorls. Teleoconch whorls sculptured by fine axial growth lines forming weak, irregularly spaced, arcuate plicules on subsutural ramp (Fig. 1.P). Under SEM (Fig. 1.R), surface is seen to be covered by a sculpture of dense microscopic pustules. Aperture lanceolate, outer lip thin. Anal sinus very deep, narrow, asymmetrical; its deepest point on sutural ramp. Protoconch (Figs. 1.S–T) of 2 ½+ whorls; tip missing, remaining whorls with diagonally cancellate sculpture terminating a short distance above abapical suture where fine slightly prosocline riblets occur. Maximum diameter about 0.48 mm. Colour of teleoconch whitish to pale buff, protoconch light brown. Dimensions: Holotype 5.8 x 2.3 mm, aperture height 2.2 mm. Largest Paratype (MZB): 7.5 x 2.9 mm, aperture height 3.1 mm. Remarks. Teretia sysoevi sp. nov. is morphologically similar to Teretia neocaledonica sp. nov. from which it differs in numerous details of shell morphology. Teretia sysoevi sp. nov. has more numerous teleoconch whorls (5–6 versus 4 – 4 ¾), a more deeply concave subsutural ramp lacking spiral cords near adapical suture and the growth lines consist of very fine lines rather than axial plicules (compare Figs. 1.E–F with Fig. 1.P–Q). Under SEM, T. sysoevi has a distinctive sculpture of dense microscopic pustules (Fig. 1.R) while T. neocaledonica has sparser granules (Fig. 1.G). The two species further differ in colour: T. sysoevi has a whitish to pale buff shell lacking the brown band typically occurring on periphery of spire whorls of T. neocaledonica. Etymology. Named after Alexander Sysoev of Zoological Museum, Moscow State University (Russia) in recognition to his contribution to our knowledge of the turriform gastropods.Published as part of Morassi, Mauro & Bonfitto, Antonio, 2015, New Indo-Pacific species of the genus Teretia Norman, 1888 (Gastropoda: Raphitomidae), pp. 560-570 in Zootaxa 3911 (4) on pages 562-564, DOI: 10.11646/zootaxa.3911.4.5, http://zenodo.org/record/24027
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