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Prionospio sp. A (HERMES canyons)

Mon, 10/27/2008 - 15:21 — lneal
Family: 
Spionidae
Genus: 
Prionospio
Species binomial name, or informal name: 
Prionospio sp. A (HERMES canyons)
Taxonomy: 
Prionospio
Authority: 
L. Neal
Material Examined: 
Project/CruiseHERMES/CD179 LocalityIberian margin - Setubal canyonSample/Dive #56816#1 GearMegacoresSample notesMesh:0.5mm; Sed. depth:0-1cm; Depth:3305m
Voucher: Ocean Basin: 
North Atlantic
Voucher: Cruise/Expedition: 
HERMES/CD179
Voucher: Location: 
Iberian margin - Setubal canyon
Voucher: Depth: 
3305m
Voucher: Sample: 
56816#1
Voucher: Repository: 
NHM London
Description: 
Branchiae a/p: present, 4 pairs
 
Branchiae start from setiger no.:    2
Arrangement and shape of branchiae:  4 pairs, 1>4 at ratio 4:1, 1st and 4th pairwrinkled, widest in the middle, 2nd and 3rd pair short fleshy subtriangular-like
 
Prostomium shape: anteriorly truncated, rectangular bottle shaped, 1 pair of eyes, peristomium forming distinct lateral wings
 
Antenna a/p: absent, but distinct caruncle reaching
 
Saber chaetae from setiger no.: 10, single,  stout and curved, granulated at the tip
 
Neuropodial hooks from setiger no. :  mostly on 12, occasionally on 13
 
Shape of neuropodial postsetal lamellae:  rectangular/ rounded, particularly enlarge on segment 2 – 5
 
Type of neuropodial hooks: multidentate, with secondary hood, largely inflated an squarish, around 7 per fascicle, with 4 smaller teeth above the man one
 
Pouches: present, from seg. no. 7; not observed in some specimens – due to damage?
 
Dorsal crest: present is some specimens on seg. no. 6
Remarks: 

Remarks In some specimens the 1st and 4th branchiae can be longer and thinner, branchiae can be easily lost. Staining: prostomium+peristomium and seg. X - XV Wrinkled branchiae – affiliation to Minuspio fauchaldi Maciole, 1985(branchiae 1=4, saber ch, delicate)) and M. laciniosa Maciolek 1985 (presence of dorsal flaps, triangular prostomium). Previous record: Setubal canyon 1995 study drawings, 3400m. Spionidae sp. Hcx (n=498) is very likely the same species. It was the second most abundant polychaete and spionid in that study.

Illustrations: 

LM photographs, attached as PDF

GenBank Accession Number: 
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