Pteriomorpha (Beurlan, 1944)
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publication ID |
https://doi.org/10.11606/1807-0205/2024.64.031 |
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persistent identifier |
https://treatment.plazi.org/id/4008878E-FFF7-A81B-8C21-DE56FC06FCC1 |
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treatment provided by |
Felipe |
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scientific name |
Pteriomorpha |
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Subclass Pteriomorpha Order Arcida
Superfamily Arcoidea Family Arcidae Genus Barbatia Gray, 1842
Barbatia pehenguis new species ( Figs. 42-43 View Figure 42 View Figure 43 ) https://zoobank.org/ 55B63294-191F-4B07-816C-CFFA9F5D09C2
Types: Holotype MZSP 165816 View Materials . Paratypes: MZSP 31071 View Materials , 20 View Materials spm from type locality. BRAZIL. Pernambuco ; Fernando de Noronha, Praia da Ressurreta , 03°46′00″S 32°23′36″W, 5 m, MZSP 48852 View Materials , 7 View Materials spm, MZSP 48857 View Materials , 4 View Materials spm (Simone col., 02.v.2005), Praia do Porto , 03°50′05″S 32°24′05″W, MZSP 31205 View Materials , 8 View Materials spm (Simone & Souza col., 17.vii.1999). Espírito Santo GoogleMaps ; Trindade Island, Ponta Noroeste , 20°29′46.4″S 29°20′35.4″W, 10 m, MZSP 108275 View Materials , 1 View Materials spm (MendonÇa col., 04.vii.2012), MZSP 162535 View Materials , 2 View Materials spm (MendonÇa col., 30.vii.2018), Andradas, 20°30′45.7″S 29°18′21.9″W, intertidal, MZSP 146942 View Materials , 1 View Materials spm (Abbate col., 05.vii.2013) GoogleMaps .
Type locality: BRAZIL. Pernambuco ; Fernando de Noronha, Ilha da Rata, Buraco do Inferno , 10 m, 03°48′29″S 32°22′52″W [Simone & Souza col., 19.vii.1999] GoogleMaps .
Diagnosis: Species from Brazilian oceanic islands of up to ~ 25 mm. Shell surface reticulate, periostracum hairy; color brown. Hinge with very small middle teeth. Eyes in mantle edge. Siphonal flap more developed. Foot lacking tentacles.
Description: Shell up to 28 mm, outline rather trapezoid-arciform. Anterior region ~80% of posterior region; ~twice longer than heigh ( Fig. 43 View Figure 43 F-G); up to ~1.5 longer than heigh ( Fig. 43C, L, M View Figure 43 ); ~3 times longer than wide ( Figs. 42 View Figure 42 E-F, 43H). Color brown, with irregular light and dark areas randomly distributed, but symmetrical in both valves ( Fig. 42 View Figure 42 A-D). Umbones slightly protruded, located in anterior third. Sculpture relatively uniform, reticulate, radial; both radial and concentric lines equally predominating; in middle and anterior thirds a predominating radial line every 6-8 smaller radial lines; in posterior third a similar sculpture, but with delicate undulating model in concentric components. Periostracum very-developed, hairy, beige; forming hair, projections and scales on predominating radial lines ( Figs. 42A, B View Figure 42 , 43D, F, L, M View Figure 43 ); periostracum exceeding shell edges, including projections ( Figs. 42C, D View Figure 42 , 43A, E, G, J View Figure 43 ). Anterior and posterior edges slightly straight, except for their rounded limits; ventral edge weakly convex ( Fig. 42 View Figure 42 A-D, C, L, M) to weakly concave ( Fig. 43F, G View Figure 43 ). Inner surface glossy, whitish, Hinge weakly arched, with ligament occupying ~½ of its length, located in its central outer region ( Figs. 42C, D, G, H View Figure 42 , 43G, I View Figure 43 ); middle third composed of ~10 very minute, orthocline teeth, almost absent in some areas ( Fig. 43I View Figure 43 ); anterior third composed of 4-5 prosocline teeth, successive larger towards anterior; posterior third composed of ~8 opisthocline teeth, successive larger up to subterminal area, diminishing in 2 last teeth. Scars of adductor muscles rounded, located in corners of hinge with anterior and posterior edged, anterior scar ~half of posterior scar ( Figs. 42C, D View Figure 42 , 43G View Figure 43 ), posterior adductor scar ~¹/₂₀ of inner valve area,pallial line simple,relatively thick.
Mantle lobes translucent, except for thick regions close to edges. Mantle edges ( Fig. 43A, B, J View Figure 43 : mb) thick, unpigmented by dark brown spots; no fusion between both lobes; outer mantle edge fold (ef) possessing series of minute dark eyes ( Fig. 43A, B, E, K View Figure 43 : ey), much more developed in number and size along posterior edge, but also present in ventral and anterior edges; middle fold (mf) relatively tall, especially in incurrent canal (in), barely forming siphons ( Fig. 43A, J View Figure 43 : si; B, E, K: mf); inner fold (if) as internal line only, away from edge. Gill (gi) large, each demibranch ~70% of pallial cavity area; inner and outer demibranchs of equal length and width; posteri- or quarter of gill sustained by strong, brown spotted gill stalks ( Fig. 43A, B, J View Figure 43 : gt). Foot very small, peduncle-like ( Fig. 43A, J View Figure 43 : ft), with thick byssus (by) in its base; pigment- ed with brown spots. Anterior adductor muscle elliptic in section ( Fig. 43A, J View Figure 43 : am), located in antero-dorsal region. Posterior adductor muscle large, located as posterior end of visceral mass (pa), slightly more ventral and with ~double size of anterior muscle. Pair of posterior retractor muscle ( Fig. 43A, J View Figure 43 : pr) with insertion as large as anterior adductor muscle, just anterior to it.
Etymology: The specific epithet is a Latinization of the native Guarani word pehẽngue, meaning sister, an allusion to the sibling condition of the present species with B. cancellaria .
Distribution: Fernando de Noronha and Trindade oceanic islands.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.