January-April, 2013 
SCAMIT Newsletter 
Vol. 31 Nos. 5-6 
Mediomastus sp 5 Harris -has banding in abdomen. Copies of her drawings were distributed. 
Notomastus sp D Harris - reported from Hyperion LAREST LB Harbor station, Washington 
State, Channel Islands, and Marina Del Rey. Staining pattern is unique, with eyespots, uniform 
width. Copies of her drawings were distributed. 
Next Dot Norris shared some provisional speeies from the SF Bay region: 
Sigambra sp SF 1 (Bay) and S. sp SF2 (offshore) - there was some diseussion and voueher sheets 
were handed out. Issues with the true identity of our eommonly reported Sigambra tentaculata 
were diseussed. Sigambra setosa was mentioned as a possible eorreet name, but some are 
not eonvineed that is eorreet and are leaning towards ereeting a provisional speeies. A laek of 
speeimens with the proboseis fully everted revealing a reeently defined eharaeter in the genus 
hinders resolution of this problem. 
Amaeana sp A from SF Bay has a striped thorax, 10 thoraeie notosetae segments. Methyl Green 
stained dark lower lip. 
Larry led a diseussion on the different Onuphis spp reported in the SCB. There are problems 
and reluetanee by many present to identify immature or juvenile individuals to speeies. A key 
eharaeter - on whieh anterior setiger the branehiae begin, is ontogenetieally influeneed. In 
partieular the diseussion eentered around ongoing issues between O. iridescens, with branehiae 
beginning on setiger I, and O. sp A, with branehiae beginning on setiger I in adults but setigers 
2-5 on immature speeimens. And, further eomplieating matters is O. geophiliformis with 
branehiae beginning on setiger 5 (setiger 3-6 (Hilbig, 1995)). The presenee of brown dorsal 
banding is ineonsistent both in the literature and members’ reports. Both O. iridescens and O. sp 
A are eommonly reported, but O. geophiliformis is rarer and generally eolleeted in deeper waters, 
likely Bight habitat. Several ideas on how to standardize the way juveniles should be handled 
were diseussed but no eonsensus was reaehed. 
Next we had a Dipolydora diseussion. Methyl Green staining differenees between D. socialis 
and D. bidentata have been noted by Bill Furlong at LACSD. An unstained third speeies was 
questioned as possibly being D. cardalia or D. neocardalia. Vasily has ID’ed CSD material as D. 
neocardalia and has other Spionid names for older Bight sample material provided by CSD that 
are not reported in Ed 7. 
Larry next led a diseussion of Arcteobia ef anticostiensis stating there are two forms with 
different types of stout notosetae. To further illustrate the notoehaetal eusping 'm Arcteobia Larry 
showed everyone his new provisional speeies Arcteobia sp LAI. It possesses Harmothoe-like 
notoehaetal eusping , is without prostomial peaks, and the ventrum is without pigment; while 
Arcteobia ef anticostiensis has MalmgreniellaAikQ notoehaetal eusping, has peristomial peaks, 
and has ventral pigment. Both possess eapillary notoehaetae, are eommensal in the tubes of 
Streblosoma crassibranchia, and ean eo-oeeur in samples. 
7 
Publication Date: 28 July 2016 
