FIGURE 3 - uploaded by Saskia Brix
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Macrostylis cerritus sp. nov., paratype female (ZIM K-41434). A, rMd; B, lMd; C, P1; D, P2; E, P3. Scales = 0.1 mm.
Source publication
Macrostylis cerritus sp. nov. (Macrostylidae) is described from the Weddell Sea, Antarctica, at a depth of 2149 m. The new species differs from other species of Macrostylis due to the incisor with 4 cusps; the strongly hook-shaped ischium of pereopod 3; pereopod 4 being greatly reduced and juvenile in appearance; the operculum bearing a ventral spi...
Contexts in source publication
Context 1
... ( Figure 3A, 3B, 6A) without palp, palp replaced with robust seta (missing on left mandible), both with 4 cusps on incisor. Right setal row with 5 robust setulose setae and 2 attenuating simple setae, left setal row with 5 robust setulose, 1 setulose simple attenuating seta and 1 simple attenuating seta. ...
Context 2
... 1 ( Figure 3C) basis length 2.9 times width, dorsally with 4 short setae, ventrally with 1 short slender and 1 long slender setae. Ischium length 2.4 times width, dorsally with 2 long slender setae, ventrally with 1 robust simple seta, laterally with 3 long slender setae. ...
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Citations
... urn:lsid:zoobank.org:act:3644D8D7-30A9-462E-9DC1-8D19C948EC9C Macrostylis cerrita Vey & Brix, 2009;pp. 356-370, Figs 1-6. ...
... Remarks. The original illustration of the habitus (Vey & Brix 2009; Fig. 1B) shows a conspicuous spine laterally on the pleotelson. This spine was not mentioned in the original description text though. ...
... genus, the ischium has a convergently similar, hook-shaped appearance. Instead of a recurved dorsal lobe, however, a hook-shaped apical spine-like seta (Fig. 22O) is present on the dorsal lobe apex. This is the case e.g. in Macrostylis carinifera Mezhov, 1988, M. dorsaetosa Riehl et al., 2012, M. papillata Riehl et al. 2012, M. spinifera Sars, 1864. Vey and Brix (2009 noticed the lateral mandibular setae and interpreted this character as autapomorphy for M. cerrita. However, the mandibular lateral setae have been recognized already before, e.g. in M. sarsi (Brandt 1992;Fig. 14) and M. magnifica Wolff, 1962(Mezhov 2000, and are present in all species described since and all type material checked (Rieh ...
The nine currently known Southern Ocean species of the asellote isopod family Macrostylidae Hansen, 1916 are reviewed. Modified diagnoses are provided. Two new species, Macrostylis matildae n. sp. and M. scotti n. sp. are formally described. M. setulosa Mezhov, 1992, and M. vinogradovae Mezhov, 1992 are redescribed. An identification key to all species is presented. Due to substantial damage and loss of type material, M. obscura (Brandt, 1992) and M. sarsi Brandt, 1992 are henceforward considered nomina dubia . DNA sequences were yielded for molecular characterization of both new species. A phylogenetic analysis shows, although from the same locality, both species are relatively distantly related. Huge divergence is discovered within Macrostylidae which casts doubt on the monotypy of the family.
... Th ey have been regularly reported from deep-sea samples (e.g. Menzies 1962, Wolff 1962, Menzies and George 1972, Brandt 2002, Wilson 2008, Vey and Brix 2009). Th is taxon consists of two genera: Macrostylis Sars, 1864 and Desmostylis Brandt, 1992. ...
... 2). During the ANDEEP cruises at least 33 species of Macrostylidae have been collected, of which 23 where unlike any previously described species (Vey and Brix 2009). In the current paper, two of these previously unknown species, M. unifomis sp. ...
Descriptions of Macrostylis antennamagna sp. n. and Macrostylis uniformis sp. n. are presented with notes on intraspecific variability and sexual dimorphism. Macrostylis uniformis sp. n. showes differences to Macrostylis antennamagna sp. n. in the length of the antenna 2, the shape of the pleotelson and length of uropods.
The genus Desmostylis Brandt, 1992 (formerly including the two species Desmostylis obscurus Brandt, 1992 and Desmostylis gerdesi Brandt, 2002) is synonymised with the genus Macrostylis. Based on type material additional remarks and additions to the original descriptions are provided for both species. Results lead to following nomenclatorial changes: Macrostylis obscurus (Brandt, 1992), comb. n. and Macrostylis gerdesi (Brandt, 2002), comb. n. A setal nomenclature is proposed and the diagnosis for the family is revised.
... Details of dactylar setation are not well recognisable from the illustration and certainly are not always complete. Menzies & George (1972), Brandt (19922002;, Malyutina & Kussakin (1996), and Vey & Brix (2009) have illustrated as well as commented at least some dactylar setation. However, details vary greatly between the descriptions. ...
... For Macrostylidae, a comprehensive overview of setae is not available and could also not be achieved throughout this study. This situation is due to the fact that most species have been described without detailed analysis and discussion of setae, except from few recent publications (Brandt, 1992;2002;Mezhov, 2003a;2003b;Vey & Brix, 2009) However, these first steps certainly present a possible direction. The provided SEM survey on setal substructures as well as the first overview presented on setae types can help to understand the sometimes obscured and unclear light-microcopic images. ...
... Several authors refer to commonly occurring strong setae on dorsal apex of the expanded P III ischium as one upon many characters distinguishing species (e.g. Vey & Brix, 2009). While position and shape of the dorsal extension is highly similar between both analysed specimens of Macrostylis antennamagna n. sp., differences in the arrangement of setae types (2 bifurcate setae vs. 1 bifurcate seta + 1 simple seta on apex) on the lobe between male and female indicate affection by sexual dimorphism. ...
