H.B. Baker, 1930
Original Description: Anodontites infossus Baker, H.B. 1930. The Mollusca collected by the University of Michigan-Williamson Expedition in Venezuela. VI. Occasional Papers of the Museum of Zoology, University of Michigan. No. 210. 1-81 + 7 plates.
Type Locality: Caño Minapam, a tributary of Rio Aroa near Palma Sola, Yaracuy, Venezuela. (A 10° 38′, 68° 31′ see Baker 1930 p. 77).
Holotype: UMMZ 112619, not UMMZ 112621 as listed by Johnson (1979:32). The holotype and paratypes of this species appear to have been catalogued under the wrong name (Anodontities aroanus H.B. Baker, 1930).
Paratypes: UMMZ 112620 (labeled co-types). ANSP 147732. [CM?] 61.97; Acc. No. 19950 [??].
Synonymy:
- Anodontites infossus H.B. Baker, 1930
- Baker, 1930:??. look up Haas 1966.
Description: “Shell long rhomboid, quite thin and very fragile (usually breaking when dried), somewhat convex; ventral evenly curved; anterior end narrowly rounded; posterior higher and sloping obliquely from just behind ligament to posterior point of escutcheon, where it forms a slight projection. Beaks: near end of anterior third; small but moderately full and elevated; hooked so as to touch above hinge line. Exterior: epidermis silvery at beaks, shading onto light olive-green toward ventral margin and still darker tints at ends of shell; sculpture similar to but much weaker than that usual in the crispatus group; growth lines mainly very weak, but produced into appressed, epidermal lamellae on posterior slope, and, to a lesser extent, near ventral margin and anterior end. Interior: nacre thin, with purplish iridescence and with shallow but distinct radial striations; adductor scars scarcely impressed; pallial line weak; sinulus shallow; prismatic border broad. Hinge: weak and almost straight; ligament quite long and exposed; lunule narrow but distinct.
A. infossus appears to be quite closely related to A. tortilis and may be only a local form of that species, but it has a more elongate shell with a straighter hinge and much weaker sculpture. Although the festooned wrinkles of the group of A. crispatus are visible, under a lens, just below the beaks, most of the shell is weakly marked with a radially arranged series of short, almost straight, horizontal lines. In shape, A. infossus is somewhat closer to A. irisans Marshall, but seems to be a much thinner and narrower shell with more prominent beaks, which are farther from the anterior end.” (Baker, 1930:67-68).
Specimens Examined: UMMZ 112619 (Holotype). Caño Minapam, Palma Sola, [Yaracuy], Venezuela. [4- 10 March, 1920]. H.B. Baker. UMMZ 112620 (7 paratypes). Caño Minapam, Palma Sola, [Yaracuy], Venezuela. [4- 10 March, 1920]. H.B. Baker. ANSP 147732 (4). Caño Minapam, Palma Sola, [Yaracuy], Venezuela. [4- 10 March, 1920]. H.B. Baker. UMMZ 48007 (6). Caño Minapam, Palma Sola, [Yaracuy], Venezuela. [4- 10 March, 1920]. H.B. Baker. FMNH 52220 (1). Calzados [=La Calzadas?], Barinas, Venezuela. pre-1954. Soc. La Salle, Caracas.
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