Laubieriopsis cabiochi (Amoureux, 1982)
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publication ID |
https://doi.org/ 10.1080/00222933.2020.1757170 |
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persistent identifier |
https://treatment.plazi.org/id/EE1B9519-FF86-FFFC-FE46-FB9F9C24FBE8 |
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treatment provided by |
Carolina |
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scientific name |
Laubieriopsis cabiochi (Amoureux, 1982) |
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Laubieriopsis cabiochi (Amoureux, 1982) View in CoL
( Figures 1 View Figure 1 (d), 2(c), 3(g,h), 8 and 9; Table 1)
Material examined
4,400 specimens (50.11% of the total) collected in 97 samples ( Figure 1 View Figure 1 (d); Table 1).
Description of BIOICE specimens
Body 2.0–10.0 mm long, 0.2–0.5 mm wide, 21 chaetigers ( Figure 8 View Figure 8 (a)); prostomium and peristomium usually retracted within CH 1–4 ( Figure 8 View Figure 8 (a–d)), partially everted in some specimens ( Figure 8 View Figure 8 (f)). Cuticle with micropapillae only visible under SEM ( Figure 8 View Figure 8 (e)). Three body regions: 1) anterior comprising prostomium, peristomium and CH 1–4, segments short with intersegmental grooves well delimited; one acicular per parapodial rami in CH 1–2 ( Figure 9 View Figure 9 (a)), bidentate ( Figure 9 View Figure 9 (b)) but unidentate in specimens <4 mm long; up to four unidentate aciculars per rami in CH 3–4 ( Figure 8 View Figure 8 (d,e)); 2) median: CH 5–20, segments longer, lacking defined intersegmental grooves; each parapodial ramus provided with one thick acicular not protruding from parapodial wall and one capillary ( Figure 9 View Figure 9 (c,d)), both types with scale cover ( Figure 9 View Figure 9 (d)); 3) posterior region comprising only CH 21 and pygidium; CH 21 bearing elongated falcate aciculars ( Figure 9 View Figure 9 (e)); pygidium uni- or bilobed, provided with three conspicuous papillae accompanied by a number of micropapillae ( Figure 9 View Figure 9 (f,g)) . One interramal papilla, spherical, hardly visible under stereomicroscope; more developed in anterior segments and displaced towards notopodium ( Figures 8 View Figure 8 (g) and 9(a,c)). One genital papilla located on posterior right side of CH 8 close to limit with CH 9 ( Figure 9 View Figure 9 (c)).
Habitat and distribution
BIOICE specimens show a range of geographic distribution in Iceland similar to that of the two aforementioned species but within a narrower range of depth and temperature values (171–196 m; 5.18–7.61ºC; Figure 2 View Figure 2 (c)). Samples are mostly distributed across western Iceland, from Vestman and Surtsey islands to Snaefelnes Peninsula south of Esternfjords ( Figure 1 View Figure 1 (d)).
This species was previously reported in the Atlantic Ocean by Petersen (2000) from North Iceland to the Faroe Islands, at depths of between 265 and 1,157 m and mud volcanoes in the Gulf of Cádiz (southern Iberian Peninsula; Cunha et al. 2013).
Remarks
BIOICE specimens mostly agreed with descriptions provided by Petersen (2000) and Salazar-Vallejo et al. (2019), but some showed some variability in relevant taxonomic characters, such as the total number of chaetigers, number of chaetae per parapodium and number and location of genital papillae. For instance, seven specimens of 7–8 mm in length and 21 chaetigers showed two genital papillae (samples 2237, 2273, 2867, 3565, 3617 – 1 spec. each-, 2308 – 2 spec. -), while two 6-mm long specimens had 22 chaetigers (sample 2392), and one 8-mm long specimen had 20 chaetigers (sample 2398), all three with only one papilla.
On the other hand, one specimen (7-mm long, sample 2401) showed 22 chaetigers and one pair of genital papillae on CH 8; these characters are also present in Laubieriopsis norvegica Zhadan & Atroshchenko, 2012 (type locality: off Bergen, Norway). However, the latter differs from our specimen in number and features of chaetae, lacking aciculars in median and posterior parapodia, which are provided only with one capillary and one very small and thin additional chaeta in each parapodial ramus ( Zhadan and Atroshchenko 2012; Salazar-Vallejo et al. 2019). Furthermore, BIOICE specimens differ from those reported in Hawaii (Central Pacific) by Magalhães et al. (2014, as cf.) in having parapodial lobes that are more developed, chaetae that are provided with scale covering along its full length and CH 21 chaetae that are longer and recurved backwards. On the contrary, Pacific specimens are small (up to 5 mm in length) and lacking genital papilla, and are provided with chaetae that are smooth basally and distally while covered by rows of spines (‘rings of denticles’) elsewhere; genital papilla is, however, discernible already in BIOICE specimens at least of 4 mm in length.
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