A new species of <i>Drymaeus</i> endemic from Currais Archipelago, Paraná, Brazil (Pulmonata, Bulimulidae)

The new bulimulid species, Drymaeus currais sp. nov., is described based on shell and anatomical features. It is endemic of Guapirá Island, belonging to the Currais Archipelago, a small protected area off Paraná coast. The species is thus, based at least on endemicity, endangered. It has as closest species D. castilhensis, another endemic species of Castilho Island, ~70 km northwards. Its main exclusivities are a banded shell (except for periumbilical area); a ureter ~1/3 opened (furrow); an external anus; a slightly different buccal and intestinal arrangement; a penis lacking internal chambers; a small receptacle with a genital appendix. Zoobank Register: urn:lsid:zoobank.org:pub:25B25A8B-CED0-4284-A799-5383998BE481.

Key-Words.
New species; Endemic; Endangered; Anatomy; Morphology; Taxonomy

Authorship

Luiz Ricardo L. Simone

Universidade de São Paulo (USP), Museu de Zoologia (MZUSP). São Paulo, SP, Brasil. E-mail: lrsimone@usp.brUniversidade de São PauloBrasilSão Paulo, SP, BrasilUniversidade de São Paulo (USP), Museu de Zoologia (MZUSP). São Paulo, SP, Brasil. E-mail: lrsimone@usp.br

http://orcid.org/0000-0002-1397-9823

Carlos Eduardo Belz ³3E-mail: belzoceanos@gmail.com

Universidade Federal do Paraná (UFPR), Setor de Ciências da Terra (CT), Centro de Estudos do Mar (CEM), Laboratório de Ecologia Aplicada e Bioinvasões (LEBIO). Pontal do Paraná, PR, Brasil.Universidade Federal do ParanáBrasilPontal do Paraná, PR, BrasilUniversidade Federal do Paraná (UFPR), Setor de Ciências da Terra (CT), Centro de Estudos do Mar (CEM), Laboratório de Ecologia Aplicada e Bioinvasões (LEBIO). Pontal do Paraná, PR, Brasil.

http://orcid.org/0000-0002-2381-8185

Marcos de Vasconcellos Gernet ⁴4E-mail: lmv.gernet@gmail.com

http://orcid.org/0000-0001-5116-5719

³E-mail: belzoceanos@gmail.com

⁴E-mail: lmv.gernet@gmail.com

Edited by: Marcelo Veronesi Fukuda

SCIMAGO INSTITUTIONS RANKINGS

Figures

Figures (7)

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Figure 1
Map of Paraná coastal area, showing the Currais archipelago location and its profile in highlight. Occurrence of specimens in the larger island (east one). A living crawling specimen also shown (shell length ~20 mm).

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Figures 2-8
Drymaeus currais sp. nov. shell of types; (2-4) Holotype MZSP 150548 (L 29.6), frontal, right and dorsal view. (5-8) Paratypes MZSP 135683. (5-6) Frontal and dorsal view (L 30.7 mm).

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Figures 9-13
Drymaeus currais sp. nov. shell and anatomical details. (9) Protoconch of paratype MZSP 135683#3 (young specimen of 14.2 mm), arrow showing transition with teleoconch. Scale = 1 mm. (10) Anterior region of mouth, ventral view, integument removed. Scale = 0.5 mm. (11) Duct of bursa sectioned longitudinally, showing 4 spermatophores inside. Scale = 1 mm. (12) Isolated spermatophore. Scale = 1 mm. (13) Reno-pericardial area, ventral view, ventral wall of kidney opened along its left edge and deflected right (upwards) to show inner tissue, ventral pericardial wall deflected left (downwards). Scale = 1 mm.

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Figures 14-22
Drymaeus currais sp. nov. radulae in SEM; (14) Holotype, wide view. Scale = 200 µm. (15) Same, higher magnification. Scale = 30 µm. (16) Same, higher magnification. Scale = 20 µm. (17) Detail of lateral region. Scale = 20 µm. (18) Same, lower magnification. Scale = 50 µm. (19) Detail of marginal region. Scale = 50 µm. (20) Paratype MZSP 135683, detail of central region. Scale = 20 µm. (21) Detail of lateral-marginal region, middle region folded. Scale = 50 µm. (22) Same, higher magnification. Scale = 20 µm. Arrows showing rachidian column.

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Figures 23-26
Drymaeus currais sp. nov. anatomy; (23) Mantle border as in situ, frontal view. (24) Pallial (pulmonary) cavity, ventral inner view, inner mantle fold deflected upwards. (25) Digestive tubes and some adjacent structures, mainly from visceral mass and posterior region of pulmonary cavity, buccal mass in dorsal view, remaining ventral view, nephrostome (ne) seen by translucency. (26) Anterior-right region of pulmonary cavity, ventral-inner view, inner mantle fold (mf) sectioned and deflected upwards. Scales = 2 mm.

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Figures 27-31
Drymaeus currais sp. nov. anatomy; (27) Foregut, left view. (28) Buccal mass, ventral view, odontophore (od) partially sectioned and deflected to left, right buccal ganglion (bg) and salivary duct (sd) (right in Fig.) insertion seen by translucency. (29) Genital system, dorsal view, partially uncoiled, some spermatophores (sm) seen by translucency. (30) Penis, detail of its proximal region, penis sheath (ps) partially sectioned. (31) Genital ducts, detail of its anterior region, some structures sectioned longitudinally. Scales = 2 mm.

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Figures 32-36
Drymaeus currais sp. nov. anatomy; (32) Middle region of genital system, ventral view, some structures seen if albumen gland (ag) was transparent. (33) Spermoviduct, transverse section in its middle level. (34) Penis, ventral view, opened longitudinally. (35) Nerve ring, dorsal view. (36) Same, ventral view. Scales = 2 mm.

Figure 1 Map of Paraná coastal area, showing the Currais archipelago location and its profile in highlight. Occurrence of specimens in the larger island (east one). A living crawling specimen also shown (shell length ~20 mm).

Figures 2-8 Drymaeus currais sp. nov. shell of types; (2-4) Holotype MZSP 150548 (L 29.6), frontal, right and dorsal view. (5-8) Paratypes MZSP 135683. (5-6) Frontal and dorsal view (L 30.7 mm).

Figures 9-13 Drymaeus currais sp. nov. shell and anatomical details. (9) Protoconch of paratype MZSP 135683#3 (young specimen of 14.2 mm), arrow showing transition with teleoconch. Scale = 1 mm. (10) Anterior region of mouth, ventral view, integument removed. Scale = 0.5 mm. (11) Duct of bursa sectioned longitudinally, showing 4 spermatophores inside. Scale = 1 mm. (12) Isolated spermatophore. Scale = 1 mm. (13) Reno-pericardial area, ventral view, ventral wall of kidney opened along its left edge and deflected right (upwards) to show inner tissue, ventral pericardial wall deflected left (downwards). Scale = 1 mm.

Figures 14-22 Drymaeus currais sp. nov. radulae in SEM; (14) Holotype, wide view. Scale = 200 µm. (15) Same, higher magnification. Scale = 30 µm. (16) Same, higher magnification. Scale = 20 µm. (17) Detail of lateral region. Scale = 20 µm. (18) Same, lower magnification. Scale = 50 µm. (19) Detail of marginal region. Scale = 50 µm. (20) Paratype MZSP 135683, detail of central region. Scale = 20 µm. (21) Detail of lateral-marginal region, middle region folded. Scale = 50 µm. (22) Same, higher magnification. Scale = 20 µm. Arrows showing rachidian column.

Figures 23-26 Drymaeus currais sp. nov. anatomy; (23) Mantle border as in situ, frontal view. (24) Pallial (pulmonary) cavity, ventral inner view, inner mantle fold deflected upwards. (25) Digestive tubes and some adjacent structures, mainly from visceral mass and posterior region of pulmonary cavity, buccal mass in dorsal view, remaining ventral view, nephrostome (ne) seen by translucency. (26) Anterior-right region of pulmonary cavity, ventral-inner view, inner mantle fold (mf) sectioned and deflected upwards. Scales = 2 mm.

Figures 27-31 Drymaeus currais sp. nov. anatomy; (27) Foregut, left view. (28) Buccal mass, ventral view, odontophore (od) partially sectioned and deflected to left, right buccal ganglion (bg) and salivary duct (sd) (right in Fig.) insertion seen by translucency. (29) Genital system, dorsal view, partially uncoiled, some spermatophores (sm) seen by translucency. (30) Penis, detail of its proximal region, penis sheath (ps) partially sectioned. (31) Genital ducts, detail of its anterior region, some structures sectioned longitudinally. Scales = 2 mm.

Figures 32-36 Drymaeus currais sp. nov. anatomy; (32) Middle region of genital system, ventral view, some structures seen if albumen gland (ag) was transparent. (33) Spermoviduct, transverse section in its middle level. (34) Penis, ventral view, opened longitudinally. (35) Nerve ring, dorsal view. (36) Same, ventral view. Scales = 2 mm.

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A new species of <i>Drymaeus</i> endemic from Currais Archipelago, Paraná, Brazil (Pulmonata, Bulimulidae)

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[1] ³E-mail: belzoceanos@gmail.com