Lagis koreni Malmgren, 1866

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, European Journal of Taxonomy 666 (666), pp. 1-32 : 22-24

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.

Figures

Fig. 1. Maps of Iceland showing distribution of the species of Pectinariidae found in BIOICE samples. A. Amphictene auricoma (O.F. Müller, 1776). B. Lagis koreni Malmgren, 1866. C. Cistenides granulata (Linnaeus, 1767). D. Cistenides hyperborea Malmgren, 1866. The three main coastal sectors around Iceland are shown in A. The specimens photographed and studied under SEM are indicated with green and red arrowheads, respectively. Abbreviations: H = Höfn; NWF = North-western fjords; RP = Reykjanes Peninsula.

Fig. 2. Temperature vs depth data of the BIOICE samples where specimens of Pectinariidae were found. A. Amphictene auricoma (O.F. Müller, 1776). B. Lagis koreni Malmgren, 1866. C. Cistenides granulata (Linnaeus, 1767). D. Cistenides hyperborea Malmgren, 1866. Specimens studied under SEM are indicated with black arrows and sample numbers.

Fig. 3. Biometric features of the Pectinariidae specimens in BIOICE samples. A. Amphictene auricoma (O.F. Müller, 1776). B. Lagis koreni Malmgren, 1866. C. Cistenides granulata (Linnaeus, 1767). D. Cistenides hyperborea Malmgren, 1866. Specimens studied under SEM are indicated with black arrows and sample numbers.

Fig. 4. Stereomicrographs of anterior body ends (dorsal view) and anterior end of the tube. A–B. Amphictene auricoma (O.F. Müller, 1776) (BIOICE sample 2946, IINH-40181). C–D. Cistenides granulata (Linnaeus, 1767) (sample 2126, IINH-40466). E–H. Cistenides hyperborea Malmgren, 1866 (E–F: sample 3252, IINH-40477; G–H: sample 2060, IINH-40471). I–L. Lagis koreni Malmgren, 1866 (I–J: sample 2557; K–L: sample 2827, IINH-40485).

Fig. 16. Lagis koreni Malmgren, 1866. SEM micrographs from two specimens: large (A, F) and medium sized (B–E), respectively (BIOICE sample 2827, IINH-40485). A. Anterior end, right lateral view. B. Uncinigers 4 to 6, ventrolateral view. C. Unciniger 3, ventral uncini. D. Unciniger 5, dorsal uncini. E. Unciniger 6, median uncini. F. Scaphe and scaphal hooks (framed: scaphal hook, detail).

Fig. 17. Lagis koreni Malmgren, 1866. SEM micrographs of a small specimen (BIOICE sample 3078, IINH-40486). A. Anterior end, ventral view. B. Cephalic veil, detail. C–E. Uncinigers 1, 4 and 11, uncini. F. Scaphal hook.