Lagis koreni Malmgren 1866
Creators: name: Parapar, Julio
name: Palomanes, Verónica
name: Helgason, Gudmundur V.
name: Moreira, Juan
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Annelida
Polychaeta
Terebellida
Pectinariidae
Lagis
Lagis koreni

description: Lagis koreni Malmgren, 1866
Figs 1B, 2B, 3B, 4 I–L, 16 – 17
Lagis koreni Malmgren, 1866: 360.
Pectinaria koreni – Hessle 1917: 80.
Pectinaria (Lagis) koreni – Fauvel 1927: 221. — Holthe 1986: 18. — Hartmann-Schröder 1996: 483. — Kirkegaard 1996: 283.
Material examined (801 specimens, 75.1% of total specimens identified, in ten samples)
ICELAND – North Western Fjords • 1 spec.; BIOICE station 31, sample 2557; 66º21′90″ N, 23º04′93″ W; 14 Jul. 1993; 7.23ºC; 34.34 ppm; 20 m depth; sand; IINH-40483. – South coast • 1 spec.; BIOICE station 553, sample 2388; 63º30′10″ N, 22º03′70″ W; 30 Jun. 1993; 7.13ºC; 35.1 ppm; 171 m depth; silty sand; IINH-40478 • 1 spec.; BIOICE station 580, sample 2454; 63º20′10″ N, 21º10′20″ W; 4 Jul. 1993; 7.19ºC; 35.08 ppm; 152 m depth; sediment unknown; MNCN 16.01/18034 • 3 specs; BIOICE station 582, sample 2459; 63º29′80″ N, 21º39′40″ W; 4 Jul. 1993; 7.10ºC; 35.08 ppm; 125 m depth; silt; IINH-40480 • 3 specs; BIOICE station 583, sample 2463; 63º25′40″ N, 21º39′89″ W; 5 Jul. 1993; 7.12ºC; 35.08 ppm; 133 m depth; silty sand and gravel; IINH-40481 • 6 specs; BIOICE station 588, sample 2477; 63º39′69″ N, 20º49′63″ W; 6 Jul. 1993;7.80ºC; 34.92 ppm; 64 m depth; shelly sand; IINH-40482 • 4 specs; BIOICE station 715, sample 2818; 63º14′64″ N, 17º50′70″ W; 25 Aug. 1995; 7.18ºC; 35.14 ppm; 206 m depth; silty sand; IINH-40484 • 770 specs; BIOICE station 718, sample 2827; 63º41′00″ N, 17º39′90″ W; 25 Aug. 1995; 8.79ºC; 34.77 ppm; 44 m depth; sandy silt; IINH-40485 • 7 specs; BIOICE station 309, sample 3078; 63º28′16″ N, 19º33′18″ W; 13 Jul. 1997; 9.55ºC; 33.97 ppm; 21 m depth; sediment unknown; IINH-40486 • 5 specs; BIOICE station 726, sample 3257; 63º20′10″ N, 19º52′20″ W; 11 Sep. 2001; 7.92ºC; 35.19 ppm; 221 m depth; sediment unknown; IINH-40487.
Occurrence
Off south-western coast of Iceland (Fig. 1B). Depth range: 20 to 221 m; bottom temperature range: 7.10 to 9.55°C (Fig. 2B). The shallowest sample (2557; 20 m) was found in north-western fjords. The easternmost sample (2827; 44 m) contains the highest number of pectinariid specimens found in any BIOICE sample (770; 96.5%)). Water mass/es: MNAW.
Remarks
Body and chaetal features match well those of L. koreni provided by Holthe (1986), including the shape and number of paleae (Figs 4I, K, 16A, 17A), smooth opercular rim (Fig. 4I, K), cirrate cephalic veil (Fig. 17 A–B), a crenulated scaphe (Fig. 16F) provided with slightly distally curved hooks (Figs 16F insert, 17F), and 16 uniramous and 12 biramous segments (see Holthe 1986). However, SEM examination again reveals differences between the uncini features and those reported in the literature, that seem related to morphological variability according to size/age. Large and mid-sized specimens (Fig. 16 C–E) bear uncini as described in the literature, i.e., having 3–4 vertical rows with many teeth (6–8) of similar size each and showing no variation across the body or within an individual torus; by contrast, uncini of small specimens (Fig. 17 C–E) have more rows of teeth (5–7) in frontal view (Fig. 16E vs Fig. 17 D–E).
Finally, SEM micrographs also show circular areas under the parapodia with segmentary arrangement (Fig. 16B); these are likely nephridial or glandular and may have a role in tube building, although this should be confirmed in future morphological studies.
description: Published as part of Parapar, Julio, Palomanes, Verónica, Helgason, Gudmundur V. & Moreira, Juan, 2020, Taxonomy and distribution of Pectinariidae (Annelida) from Iceland with a comparative analysis of uncinal morphology, pp. 1-32 in European Journal of Taxonomy 666 (666) on pages 22-24, DOI: 10.5852/ejt.2020.666, http://zenodo.org/record/3899270