Volvatella maculata K. Jensen, 2015

タマシキブドウギヌ Volvatella maculata
Photographed by
今川郁
Location
Tengan(Kombu), Hontou (East coast), Okinawa, Japan
Date
2019/04/30
Length
7mm
Depth
3.0m
Water temperature
23.0℃

MORPHOLOGY

This has been described for the single specimen collected in 2006 (Jensen, 2009). Head and foot can be completely retracted into shell. No cephalic shield, just two pairs of highly motile cephalic lobes. Anterior pair grooved and larger than more dorsally positioned, triangular, posterior pair. Foot short and narrow, rounded posteriorly and with broad, rounded anterior lobes. Ciliated spawn groove running from female genital papilla towards mouth area. Gill forming a band of longitudinal lamellae across mantle roof and underneath infrapallial lobe. Shell adductor muscle attached to mantle fold at right anterior corner, traversing neck along diaphragm separating cephalic region from visceral mass, and attaching ventrally to inner lip of shell just in front of umbilicus. Small osphradium at dorsal attachment of adductor muscle.

DISTRIBUTION

Singapore

ETYMOLOGY

The specific epithet maculata refers to the circular spots on the mantle of this species.

References