Lagis koreni Malmgren 1866
- Dataset
- Taxonomy and distribution of Pectinariidae (Annelida) from Iceland with a comparative analysis of uncinal morphology
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- order
- Terebellida
- family
- Pectinariidae
- genus
- Lagis
- species
- Lagis koreni
description
Figs 1 B, 2 B, 3 B, 4 I – L, 16 – 17
discussion
Remarks Body and chaetal features match well those of L. koreni provided by Holthe (1986), including the shape and number of paleae (Figs 4 I, K, 16 A, 17 A), smooth opercular rim (Fig. 4 I, K), cirrate cephalic veil (Fig. 17 A – B), a crenulated scaphe (Fig. 16 F) provided with slightly distally curved hooks (Figs 16 F insert, 17 F), 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. 16 E vs Fig. 17 D – E). Finally, SEM micrographs also show circular areas under the parapodia with segmentary arrangement (Fig. 16 B); these are likely nephridial or glandular and may have a role in tube building, although this should be confirmed in future morphological studies.
distribution
Occurrence Off south-western coast of Iceland (Fig. 1 B). Depth range: 20 to 221 m; bottom temperature range: 7.10 to 9.55 ° C (Fig. 2 B). 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.
materials_examined
Material examined (801 specimens, 75.1 % of total specimens identified, in ten samples) ICELAND – North Western Fjords • 1 spec.; BIOICE station 31, sample 2557; 66 º 21 ′ 90 ″ N, 23 º 04 ′ 93 ″ W; 14 Jul. 1993; 7.23 ºC; 34.34 ppm; 20 m depth; sand; IINH- 40483. – South coast • 1 spec.; BIOICE station 553, sample 2388; 63 º 30 ′ 10 ″ N, 22 º 03 ′ 70 ″ W; 30 Jun. 1993; 7.13 ºC; 35.1 ppm; 171 m depth; silty sand; IINH- 40478 • 1 spec.; BIOICE station 580, sample 2454; 63 º 20 ′ 10 ″ N, 21 º 10 ′ 20 ″ W; 4 Jul. 1993; 7.19 ºC; 35.08 ppm; 152 m depth; sediment unknown; MNCN 16.01 / 18034 • 3 specs; BIOICE station 582, sample 2459; 63 º 29 ′ 80 ″ N, 21 º 39 ′ 40 ″ W; 4 Jul. 1993; 7.10 ºC; 35.08 ppm; 125 m depth; silt; IINH- 40480 • 3 specs; BIOICE station 583, sample 2463; 63 º 25 ′ 40 ″ N, 21 º 39 ′ 89 ″ W; 5 Jul. 1993; 7.12 ºC; 35.08 ppm; 133 m depth; silty sand and gravel; IINH- 40481 • 6 specs; BIOICE station 588, sample 2477; 63 º 39 ′ 69 ″ N, 20 º 49 ′ 63 ″ W; 6 Jul. 1993; 7.80 ºC; 34.92 ppm; 64 m depth; shelly sand; IINH- 40482 • 4 specs; BIOICE station 715, sample 2818; 63 º 14 ′ 64 ″ N, 17 º 50 ′ 70 ″ W; 25 Aug. 1995; 7.18 ºC; 35.14 ppm; 206 m depth; silty sand; IINH- 40484 • 770 specs; BIOICE station 718, sample 2827; 63 º 41 ′ 00 ″ N, 17 º 39 ′ 90 ″ W; 25 Aug. 1995; 8.79 ºC; 34.77 ppm; 44 m depth; sandy silt; IINH- 40485 • 7 specs; BIOICE station 309, sample 3078; 63 º 28 ′ 16 ″ N, 19 º 33 ′ 18 ″ W; 13 Jul. 1997; 9.55 ºC; 33.97 ppm; 21 m depth; sediment unknown; IINH- 40486 • 5 specs; BIOICE station 726, sample 3257; 63 º 20 ′ 10 ″ N, 19 º 52 ′ 20 ″ W; 11 Sep. 2001; 7.92 ºC; 35.19 ppm; 221 m depth; sediment unknown; IINH- 40487.