Megalobulimus gummatus ( Hidalgo, 1870 )

Fontenelle, José Heitzmann, Simone, Luiz Ricardo L. & Cavallari, Daniel Caracanhas, 2021, Megalobulimus dryades, a new species from the Atlantic Forest in southeastern Brazil, and redescription of Megalobulimus gummatus (Gastropoda: Strophocheilidae), Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 61, pp. 1-17 : 10

Megalobulimus gummatus ( Hidalgo, 1870) ( Figs. 10-12 )

Synonymy see Bequaert (1948). Complement:

Bulimus gummatus Hidalgo, 1870: 41 .

Strophocheilus (Megalobulimus) terrestris gummatus: Bequaert, 1948: 115 , pl. 17, fig. 6; Mello & Coelho, 1989: 378.

Strophocheilus gummatus: Morretes,1949: 143 ; Templado et al., 1993: 92.

Megalobulimus (Phaiopharus) gummatus: Morretes, 1952: 113, 1953: 65 .

Megalobulimus gummatus: Salgado & Coelho, 2003: 158 (in part); Breure & Araujo, 2017: 103, fig. 38-B.

Types: Holotype: BRAZIL, Rio de Janeiro, MNCN 15.05 /3199, 1 sh (Paz col., xi/1862) ( Fig. 10 A-C).

Type locality: Rio de Janeiro State.

Material examined: Holotype. Additional material: Brazil, MZSP 94172 (3 sh) ; Rio de Janeiro, Cabo Frio , MZSP 34703 (5 sh), MZSP 92424 (2 sh), MZSP 29374 (2 sh) ; Arraial do Cabo , MZSP 73766 (2 sh), MZSP 34420 (1 spm), MZSP 34421 (1 spm), MZSP 34422 (1 sh), MZSP 34223 (1 spm), MZSP 66800 (3 sh) .

Diagnosis: Shell large, glossy and thin; protoconch presenting microsculpture consisting of granules and spiral lines, and macrosculpture consisting of delicate axial riblets and spiral threads that are more apparent on last nepionic whorl. Teleoconch sculptured by thin axial growth lines intercrossed by spiral cords, producing a reticulate aspect; peristome pure white; columella slightly concave. Head-foot whitish to light gray; talon and free oviduct appendix, absent, free oviduct short, penis clavate, and epiphallus without flagella.

Figures

Figure 10. Shells of Megalobulimus gummatus: (A-C) holotype MNCN 1505/3199 (Rio de Janeiro), (A) apertural view, (B) lateral view, (C) abapertural view; (D-G) ANSP 428461 (Rio de Janeiro),(D) abapertural view,(E) lateral view,(F) apertural view,(G) protoconch;(H) MZSP 66800 (Arraial do Cabo,RJ),apertural view; (I-J) FMNH 216409 (Macaé,RJ,det.Bequaert,1953),(I) apertural view,(J)protoconch.Arrows indicate location of spiral sulci.

Figure 11.Megalobulimus gummatus anatomy:(A) jaw;(B) radula,central region in SEM.

Figure 12. Megalobulimus gummatus anatomy:(A) pallial chamber,renopericardial region,ventral view;(B) pneumostome region,ventral view,inner lip or pneumostome deflected;(C) genitalsystem,complete dorsalview;(D) anteriorregion of genital ducts,lateral view;(E)same,opened longitudinally;(F)Carrefour region, ventral view;(G) penis and epiphallus opened longitudinally.Scale bars = 5 mm.