Protoaeginella paraspinipoda, Guerra-García, 2004
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publication ID |
https://doi.org/ 10.5281/zenodo.5393370 |
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persistent identifier |
https://treatment.plazi.org/id/03853225-FFA5-7E24-CF85-CDE4FEC9A8FF |
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treatment provided by |
Marcus |
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scientific name |
Protoaeginella paraspinipoda |
| status |
sp. nov. |
Protoaeginella paraspinipoda View in CoL n. sp.
( Figs 6-9 View FIG View FIG View FIG View FIG )
TYPE MATERIAL. — Holotype: stn 120, (MNHN- Am 5257). Allotype: stn 120, (MNHN-Am 5258).
Paratypes: stn 120, 9, 5 (MNHN-Am 2948), and 16, 19 (MNHN-Am 2961).
ETYMOLOGY. — The specific name paraspinipoda refers to the species similarity to P. spinipoda Laubitz & Sorbe, 1996 .
DISTRIBUTION. — So far, only known from the Azores.
DESCRIPTION
Holotype, male (10.1 mm)
Lateral view ( Fig. 6A View FIG ). Head and pereonites with small tubercules. Eyes absent. Pereonite 1 fused with head although the suture between them is very distinct. Pereonites 2 to 5 increasing in length. Pereonite 7 the shortest.
Gills ( Fig. 6A View FIG ). Present on pereonites 3-4, elongate, length about five times width. A seta present near the base of the gills.
Mouthparts. Upper lip ( Fig. 7E View FIG ) symmetrically bilobate, with a row of minute setulae apically. Mandibles ( Fig. 7A, B View FIG ) with three-articulate palp; distal article of palp with a row of five plumose setae following the formula 1-3-1; mandibular molar present, strong; incisor and lacinia mobilis five-toothed; left mandible ( Fig. 7A View FIG ) with three plumose setae near lacinia mobilis and right mandible ( Fig. 7B View FIG ) with two plumose setae; molar flake present on right mandible, rectangular. Lower lip ( Fig. 7D View FIG ) inner and outer lobes well demarcated, with setulae; inner lobes round- ed. Maxilla 1 ( Fig. 7F View FIG ) outer lobe carrying seven spiniform setae; distal article of the palp with five robust setae apically and two medial setae. Maxilla 2 ( Fig. 7G View FIG ) inner lobe oval, carrying five setae distally; outer lobe rectangular, 1.3 times as long as inner lobe, with 10 apical setae. Maxilliped ( Fig. 7C View FIG ) inner plate carrying two nodular setae (short and robust like a tooth), two simple setae and five plumose setae, one of them small and robust and placed on the inner margin; outer plate oval, 1.8 times as long as inner plate, with four nodular setae, two distal apical simple setae and one lateral simple seta; palp four-articulate, second and third article setose.
Antennae. Antenna 1 ( Fig. 8A View FIG ) about one sixth of body length; distal article of the peduncle provided with a small accessory flagellum which carries two distal setae; flagellum six-articulate. Antenna 2 ( Fig. 8B View FIG ) without swimming setae; proximal peduncular article with acute projection distally; flagellum two-articulate.
Gnathopods. Gnathopod 1 ( Fig. 8C View FIG ) basis as long as ischium to carpus combined; propodus palm with a pair of grasping spines proximally; grasping margin of propodus palm with small setulae on the anterior end; dactylus serrate. Gnathopod 2 ( Fig. 8D View FIG ) inserted on the anterior half of pereonite 2 ( Fig. 6A View FIG ); basis 0.8 times as long as pereonite 2; ischium rectangular; merus rounded; carpus short and triangular; propodus elongate, as long as basis; palm with proximal projection provided with a single spine, followed by rows of small setulae and serrate margin on distal half; dactylus with smooth margin, provided with a row of tiny setulae.
Pereopods. Pereopods 3, 4 and 5 absent; a small knob with a single setae instead of pereopod 5. Pereopod 6 and 7 missing in male holotype ( Fig. 6A View FIG ) described from the female allotype ( Fig. 6B View FIG ).
Penes ( Fig. 9C View FIG ). Penes large and elongate, twice as long as width.
Abdomen ( Fig. 9C View FIG ). Abdomen with indistinct dorsal suture line, apparently two-segmented. A pair of appendages well developed, onearticulate, with two small seta medially and ending with five long teeth.
Allotype, female (7.3 mm)
Oostegites not setose ( Fig. 6B View FIG ). Genital papillae ( Fig. 6B View FIG ) with a distal seta. Palm of gnathopod 2 not serrated distally ( Fig. 8E View FIG ). Pereopod 6 ( Fig. 9A View FIG ) attached to the posterior end of the pereonite 6 ( Fig. 6B View FIG ), six-articulate, basis without carina, ischium short and rectangular; merus, carpus and propodus palm carrying row of short setae. Pereopod 7 ( Fig. 9B View FIG ) similar to pereopod 6. Abdomen ( Fig. 9D View FIG ) with a pair of small appendages one-articulate carrying a small distal seta.
REMARKS
The genus Protoaeginella was established by Laubitz & Mills (1972) based on the species P. muricata Laubitz & Mills, 1972 , collected from the Gay Head-Bermuda transect (North Atlantic) at 1330-4970 m. Recently, Laubitz & Sorbe (1996) described the second species of the genus, P. spinipoda from Bay of Biscay (North Atlantic) at 2990-3070 m. With the present study, so far, four species are known in the genus Protoaeginella : P. muricata , P. spinipoda and the new species P. paraspinipoda n. sp. and P. verrucosa n. sp., described in this paper.
The body length measured for the males of P. paraspinipoda n. sp. was 7.61 ± 1.33 mm (mean ± standard deviation) (range 5.45-10.10 mm). For the females it was 6.27 ± 0.61 mm (5.09-7.30 mm). In connection with the intraspecific variation, the morphological characters of antennae, mouthparts, gnathopods, pereopods and abdomen are constant in all the specimens examined, except for the lacinia mobilis in the right mandible, which can be five- or six-toothed, and the number of distal teeth in the appendages of the male abdomen which ranges from three to five.
Although the description and figures of Laubitz & Sorbe (1996) for P. spinipoda are clear and detailed, taking into account that P. paraspinipoda n. sp. is very close to P. spinipoda , the type material of P. spinipoda , deposited in the MNHN, have been consulted for comparison (holotype [MNHN-Am 4835], allotype [MNHN-Am 4836] and paratypes, 8 and 6 [MNHN-Am 4837]). Both species, P. spinipoda and P. paraspinipoda n. sp. are similar in the feature of the antennae, gnathopods and body proportions but can be distinguished mainly on the basis of the following characteristics, which are constant in all the specimens examined: 1) the body of P. spinipoda is almost smooth, without marked tubercles ( Fig. 10 View FIG ), whereas P. paraspinipoda n. sp. has small tubercles dorsally and laterally on the body ( Fig. 6 View FIG ); 2) the abdomen is three- to foursegmented in P. spinipoda ( Fig. 11 View FIG ), whereas it is indistinctly two-segmented in P. paraspinipoda n. sp. ( Fig. 9C, D View FIG ); and 3) the male appendages of the abdomen have nine or 10 apical teeth in P. spinipoda ( Fig. 11A View FIG ) and three to five apical teeth in P. paraspinipoda n. sp. ( Fig. 9C View FIG ).
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.