Phallomedusa austrina Golding, Ponder & Byrne, 2007, sp. nov.

• Main Authors: Golding, Rosemary E., Ponder, Winston F., Byrne, Maria
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Mollusca; Gastropoda; Amphibolidae; Phallomedusa; Phallomedusa austrina; Sawyer Bay
• Online Access: https://doi.org/10.5281/zenodo.6240294; http://treatment.plazi.org/id/03F887BA99145421118FC4A1FE93F82E

Phallomedusa austrina sp. nov. Holotype (Fig. 2 J): Australia, Tasmania: near Stanley, Sawyer Bay, East Inlet, damp mudflats between high tide and midshore, 20 Apr 2004, W.F. Ponder (AMS C.446510). Paratypes: Same data as holotype (AMS C.446509), 19 specimens. Etymology: Austrina (Latin—southern), in reference to the distribution. Description: Shell (Fig. 2 J): Solid, opaque, spire relatively short, shell diameter to 20 mm, slight shoulder on rounded last whorl; suture deeply impressed. Surface with uneven raised axial striae. Outer apertural lip thickened at base near columella. Exterior brown with narrow reddish-brown zigzags present only on spire, last whorl pinkish-green with pale band, pattern less distinct on lower whorls, often discoloured. Interior of aperture pink to purple. Operculum: As for P. s o l i d a . External morphology: As for P. s o l i d a . Digestive system: As for P. solida . Radula (Figs. 11 C, D): As for P. s o l i d a . Central nervous system: As for P. s o l i d a , but presence of subcerebral and parapedal commissures not confirmed. Reproductive system (Fig. 15 C): As for P. s o l i d a with following differences: Penis short, spiral base with only one or two spiral convolutions of sperm groove and associated flanges; lacking terminal shield. Tentaclelike appendages on distal penis much longer, thicker and more numerous than P. s o l i d a . Muscular vagina shorter with expanded upper oviduct rounded, lacking protruding bulges. Distribution and habitat (Fig. 1): Known only from East Inlet, Sawyer Bay, Stanley, north-western Tasmania, found sympatrically with P. s o l i d a , but occupying a lower portion of the shore. Phallomedusa austrina sp. nov. probably has a larger distribution, but the extent is unknown. Remarks: Phallomedusa austrina sp. nov. is readily distinguished from P. s o l i d a by the enlarged lower whorl and reduced zigzag patterning of the shell and by the longer penial elaborations. Specimens of P. austrina sp. nov. have probably been historically misidentified as ...