Cylindrobulla beauii Fischer, 1857

Laetz, Elise, Christa, Gregor, Händeler, Katharina & Wägele, Heike, 2014, The Cylindrobulla / Ascobulla complex — unraveling problems in identification and adding to Cylindrobulla diversity (Gastropoda, Heterobranchia, Sacoglossa) by describing a new species, Zootaxa 3893 (3), pp. 339-362 : 348-349

Cylindrobulla beauii Fischer, 1857

Material. Shell length of investigated specimen ( Figure 1 C): 2.2 mm; shell width 1.2 mm.

Distribution. This species is extensively recorded in Brazil, Caribbean and Florida ( Mikkelsen 1998).

Description. Only partial re-examination was possible since part of animals were used for barcoding and radula examination. Our results agree with description of Mikkelsen (1998) (see Figures 1 C, F, H).

External anatomy of live specimen. Many internal structures visible through shell, similar to those of new species ( Figure 1 D).

Radula. Radula with 70 broad smooth teeth, each roughly pentagonal in shape ( Figure 4 D, E). Each tooth with 3–4 slightly curved denticles on each side, increasing in size toward center and flanking a single median cusp. Median cusp and denticle immediately flanking on each side gradually protrude from other lateral cusps to form a trident shape ( Fig. 4 F).

Further anatomical structures. Digestive gland large and filling most parts of visceral cavity, including inner coils.

Figures

FIGURE 1. External anatomy of Cylindrobulla schuppi sp. nov. and C. beauii. A— C. schuppi sp. nov. habitus (living). B—Schematic drawing showing external and internal anatomy of C. schuppi sp. nov. visible through the shell. C— C. beauii habitus (preserved). D—Schematic drawing showing external and internal anatomy of C. beauii visible through shell. E— C. schuppi sp. nov. shell apex. F— C. beauii shell apex. G— C. schuppi sp. nov. (lateral view) showing shell lip (arrow). H— C. beauii (lateral view). Abbreviations: al—albumen gland, cs—cephalic shield, dg—digestive gland, f—foot, g—gill, h—heart, k—kidney, sa—shell adductor muscle, sh—shell, sl—shell lip. Scale bars: A— 2 mm, C— 0.5 mm, E— 0.2 mm, F— 0.2 mm, G— 2 mm, H— 0.5 mm.

FIGURE 4. Cylindrobulla schuppi sp. nov. digestive system and C. beauii radula. A—Cross section of C. schuppi sp. nov. pharyngeal bulb anterior part; B— C. schuppi sp. nov. pharyngeal bulb posterior part with ascus; Note that there are no teeth in the ascus; C— C. schuppi sp. nov. intestine, shortly after emerging from stomach; note the absence of a typhlosole; D— C. schuppi sp. nov. entire radula; E— C. beauii radula; F— C. beauii radula teeth, showing trident shape. Abbreviations: a—ascus, dg—digestive gland, i—intestine, ll—lower radular limb, od—odontophore, s—stomach, sr—salivary gland reservoir, ul—upper radular limb. Scale bars: A— 50 µm, B— 20 µm, C— 20 µm, D— 20 µm, E— 50 µm, F— 20 µm.