Leucosolenia sp. A
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlad104 |
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DOI |
https://doi.org/10.5281/zenodo.11265507 |
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persistent identifier |
https://treatment.plazi.org/id/039D223D-FFB8-FFEA-FEEC-FC7666E2F84A |
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treatment provided by |
Plazi |
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scientific name |
Leucosolenia sp. A |
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Leucosolenia sp. A View in CoL
( Figs 17 View Figure 17 , 18 View Figure 18 ; Table 7)
Material studied: Three specimens. Molecular data— three specimens %WS11692* WS11752* WS11770)* external morphology— three specimens %WS11692* WS11752* WS11770) * skeleton organization— two specimens %WS11752* WS11770)* spicules %SEM)— two specimens %WS11692* WS11770) %Supporting Information* Table S1).
External morphology: Studied specimens small in size. Length of cormus up to 1 cm. Cormus represented by compact reticulation of tubes* from which several oscular tubes arising. Oscular tubes erect and almost straight. Surface minutely hispid. Coloration of living and preserved specimens greyish white % Fig. 17A View Figure 17 ).
Spicules: Diactines % Fig. 18 View Figure 18 A-C). Two populations: %i) curved* spiny* lanceolate diactines % Fig. 18B View Figure 18 )* mean length 189.1 µm* mean width 7.2 µm % Table 7)* small* from almost straight to slightly curved and undulating* with lanceolate and spiny outer tip* spines in distinct rows % Fig. 18C View Figure 18 ); %ii) curved* smooth diactines % Fig. 18A View Figure 18 )* mean length 515.0 µm* mean width 11.6 µm % Table 7)* rare* long* slightly curved* without spines and lanceolate tips % Fig. 18C View Figure 18 ).
Triactines % Fig. 18D View Figure 18 * E). Predominantly T-shaped* sagittal %mean angle 146.5°) % Table 7). Unpaired actines variable in size: equal to* shorter* or longer than paired actines* but shorter unpaired actines most common %mean length: 118.5 µm—unpaired* 125.1 µm—paired) % Table 7). Both straight and bent paired actines common. Abnormal triactines in high numbers % Fig. 18E View Figure 18 )* sometimes with undulated actines. Unpaired actines usually slightly slender than paired %mean width: 11.1 µm—unpaired* 11.6 µm—paired) % Table 7).
Tetractines % Fig. 18F View Figure 18 ). Quite rare. Predominantly T-shaped %mean angle 140.8°) % Table 7)* variable in size. Unpaired actines equal to paired ones %mean length: 114.3 µm—unpaired* 113.2 µm—paired* 30.0 µm—apical) % Table 7). Unpaired actines straight* paired actines straight or undulating* apical actines curved or undulating* smooth. Paired and unpaired actines equal in width* apical actine more slender %mean width: 8.6 µm—unpaired* 8.5 µm—paired* 7.1 µm—apical) % Table 7).
Skeleton : Skeleton of both oscular rim and cormus tubes predominantly formed by triactines* tetractines rare % Fig. 17C View Figure 17 * D). In oscular tubes* spicules constitute organized array with their unpaired actines directed toward cormus and oriented more or less in parallel to proximo-distal axis of oscular tube % Fig. 17C View Figure 17 ). In cormus tubes spicule array completely disordered % Fig. 17D View Figure 17 ). Prominent oscular crown absent % Fig. 17B View Figure 17 ). Both populations of diactines cover tubes’ surface* orienting in different directions and extending outside.
Cytology: No material was available for cytological studies.
Distribution: Arctic species. Molecular identity confirmed only for the White Sea and Greenland. Found subtidal up to 15 m on rocks and red algae.
Reproduction: No data about reproduction time for this species.
Remarks: Although both our species’ delimitation analysis based on the H3 dataset and morphological data suggest that this species represents a distinct species-level unit* we avoid describing a new species as this case requires additional studies for several reasons. Leucosolenia sp. A shares some features with Leucosolenia corallorrhiza : %i) the external appearance is similar* %ii) the angle between unpaired actines in tri- and tetractines is similar %the mean angle is 142.9° in L. corallorrhiza and 146.5° in Leucosolenia sp. A )* and %iii) the unpaired actines in tri- and tetractines are commonly shorter than the paired ones.
However* these two species show several differences. Firstly* Leucosolenia sp. A has two populations of diactines* the smaller with lanceolate tips and the rare* large* curved* smooth* non-lanceolate diactines* whereas in L. corallorrhiza only the first type is present. Also* the tetractines are rare in both the cormus and oscular regions of Leucosolenia sp. A * while they are commonly present in the osculum of L. corallorrhiza . Leucosolenia sp. A commonly has triactines with bent* unpaired actines* which are straight in L. corallorrhiza . Finally* the mean length of actines in tri- and tetractines of L. corallorrhiza is shorter than those of Leucosolenia sp. A % L. corallorrhiza : 70.5 µm—unpaired actines mean length* 82.7 µm—paired actine mean length; Leucosolenia sp. A : 118.5 µm—unpaired mean length* 125.1 µm—paired mean length). At the same time* the limited material of Leucosolenia sp. A %only three specimens were collected and studied) does not allow us to study the possible interspecific variation and ontogenetic variation. Therefore* we avoid the designation of this species as a distinct one* until more material would be available for study.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.