Iberobathynella (Asturibathynella) lamasonensis, Camacho, 2005
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publication ID |
https://doi.org/ 10.1080/00222930400025748 |
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persistent identifier |
https://treatment.plazi.org/id/2517D47F-E75B-7454-AC62-FAA1FDAFC55F |
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treatment provided by |
Felipe |
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scientific name |
Iberobathynella (Asturibathynella) lamasonensis |
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sp. nov. |
Subgenus Asturibathynella Camacho and Serban, 1998 Iberobathynella (Asturibathynella) lamasonensis n. sp.
( Figures 1 View Figure 1 , 2 View Figure 2 )
Material examined
Fuente de la Estragüeña, La Hermida (Cantabria) (coordinates X: 369823, Y: 4795611, Z: 100 m) (type locality), collected by PASCALIS team (4 April 2002) (five males, seven females and three juveniles). The details of the new description are all based on adult specimens (five males and seven females). The holotype is a male and the type series contains 14 specimens (paratypes) ( MNCN 20.04 About MNCN /5911) .
Description
Body. Total length males 0.95–1.16 (holotype 0.96 mm) and of females 1.0– 1.1 mm. Body elongated, segments progressively widening towards posterior end of body. Head of similar length and width.
Antennule ( Figure 1A View Figure 1 ). With seven segments; no sexual dimorphism; length of first four segments greater than that of last three; setation as in Figure 1A View Figure 1 (segment 5 with one aesthetasc; segments 5 and 6 with three aesthetascs).
Antenna ( Figure 1B View Figure 1 ). Three-segmented, last segment longest, with two smooth and one plumose terminal setae and a small, shorter seta in the middle; first two segments without setae.
Labrum ( Figure 1C View Figure 1 ). With eight main teeth, and two lateral teeth at either end.
Mandible ( Figure 1D View Figure 1 ). Pars incisiva with five well-developed teeth; pars molaris with six teeth, four strong distal and two small joined proximal teeth with a large number of fine setae; mandibular palp does not exceed pars incisiva in length.
Maxillule ( Figure 1E View Figure 1 ). Proximal endite with four claws (spines of different sizes); distal endite with six claws, two smooth and apical, the other four with spines; three subterminal smooth setae on outer distal margin.
Maxilla ( Figure 1F View Figure 1 ). Three-segmented, without setae on basal segment; segment 2 with two long setae and one shorter at the distal end, one additional seta on inner border; segment 3 elongated with 15 setae.
Thoracopods. Thoracopods 1–7 ( Figure 2A–G View Figure 2 ): well developed, length gradually increasing from 1 to 5, last three similar in size; well-developed epipodite on 2–7, not measuring more than half length of basipod; basipod with one lateral, terminal seta. Thoracopod 1 ( Figure 2A View Figure 2 ): short, exopod one-segmented in all completely developed specimens, with three setae (terminal setae one plumose, the other barbed) and with two groups of ctenidia at distal margin of the exopod; endopod four-segmented: segment 1 with one smooth ventral seta, 2 with one smooth and one plumose seta, 3 with two setae, one small and smooth and the other tiny, terminal segment with two claws of different length and one seta. Thoracopods 2–7 ( Figure 2B–G View Figure 2 ): exopod biarticulated, segment 1 with two terminal setae, one short and smooth and one long and barbed; segment 2 with two terminal setae, one barbed, the other plumose; ctenidia at distal margin of the segments; endopod four-segmented, segment 1 short and without setae; 2 with two groups of lateral ctenidia and one plumose and one smooth seta (absent on thoracopod 7 and sometimes on thoracopod 6 also); 3 with one tiny seta; and 4 with one seta and two strong claws of similar length. Thoracopod 8, male ( Figure 1G, H View Figure 1 ): massive, almost square; basal region massive; inner lobe almost square and completely integrated in the basal region, does not exceed the distal end of dentate lobe; dentate lobe with 10–12 teeth; basipod rounded and with one short seta at the end, endopod not very small, with two setae; exopod small with two small teeth; outer lobe not fused with basipod and almost triangular. Thoracopod 8, female paratype ( Figure 1I View Figure 1 ): not very small and with wrinkled cuticle, with one small terminal tooth and another small dorsal tooth.
Dorsal margin of pleotelson ( Figure 2I View Figure 2 ). Anal operculum not pronounced; one barbed seta on lateral side.
Uropod ( Figure 2H View Figure 2 ). Sympod almost twice the length of endopod and four times longer than wide; with eight barbed spines, the most distal a little longer than the others which are of equal length and located along two-thirds of length; endopod longer than exopod, with two barbed setae of similar length which exceed the distal end of the endopod; exopod with two terminal barbed setae, one subterminal barbed seta and one basal plumose seta.
Furca ( Figure 2I View Figure 2 ). With seven barbed spines (the two terminal ones a little longer and thicker); two dorsal plumose setae, one large and the other shorter.
Etymology
The species name is derived from the Lamason valley, which is full of caves and different species of the genus Iberobathynella .
Remarks
The new species belongs to the subgenus I. ( Asturibathynella ) (six teeth on the distal endite of maxillule, amongst other characteristics).
In the new species the thoracopod 8 female has a wrinkled cuticle as in four of the species in the subgenus, I. (A.) rouchi Camacho, 1987 , I. (A.) asturiensis Serban and Comas i Navarro, 1978, I. (A.) parasturiensis Camacho and Serban, 1998, and I. (A.) guarenensis Camacho, 2003b (see Table I); with two spines as in the other three species except I. (A.) guarenensis which only has one; I. (A.) parasturiensis and I. (A.) asturiensis have a pronounced anal operculum and I. (A.) rouchi and I. (A.) guarenensis have no pronounced anal operculum, like the new species, although in this new species it is slightly more pronounced. The presence of a single aesthetasc on segment 5 of the antennule indicates a similarity with I. (A.) asturiensis and I. (A.) parasturiensis, but it is different from them in many other aspects (e.g. the setation on maxilla and mandible) (see Table III). The setation on the maxilla (0 setae on the first segment and 15 on the third) and the number and type of setae on the exopod and endopod of the uropod (although in this case the two setae go beyond the distal end of the endopod and in other cases they are shorter), and also the number of spines on the sympod being close to I. (A.) guarenensis. The new species has five and six teeth on the pars incisiva and pars distalis, respectively, whereas I. (A.) guarenensis has six and five, respectively. In short, it is closest to I. (A.) guarenensis, but differs in a character as important as the number of segments of the antennule (six in this species, seven in the new species) and in other details (see Table III). We can be sure this is a new species given that, although it shares some characters with other species of the subgenus, the combination of all characters is unique. The appearance and size of the different lobes of the thoracopod 8 male are also unique.
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.
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