Spelaeomysis bottazzii, Caroli, 1924
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publication ID |
https://doi.org/ 10.1093/zoolinnean/zlac083 |
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DOI |
https://doi.org/10.5281/zenodo.7797613 |
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persistent identifier |
https://treatment.plazi.org/id/D96287D1-4B7F-3213-D0B9-1788FEAF114E |
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treatment provided by |
Plazi |
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scientific name |
Spelaeomysis bottazzii |
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STYGIOMYSIDA: SPELAEOMYSIS BOTTAZZII View in CoL View at ENA
The first pair of thoracopods (Thp1) is modified in comparison to the third to eighth pairs (Thp3–8) of pediform thoracopods, while Thp2 has a somewhat intermediate morphology. The following description is based on a detailed examination of the right first thoracopod of one female of S. bottazzii ( Fig. 15 View Figure 15 ).
Cuticle and skeletal structures of Thp 1 in S. bottazzii
The more or less rectangular protopod (almost as wide as long) of S. bottazzii consists of the coxa (one-third) and basis (two-thirds of the total length of the protopod). It appears clearly separated from the thorax, although our examination allowed no specific statement on the articulation or connection of the thorax and coxa.
The coxa (Coin Fig. 15C View Figure 15 ) appears as a broad ring with a slightly protruding distomedial margin. Laterally, a lamellar, elongate epipod attaches (Ep in Fig. 15C View Figure 15 ). It broadens somewhat in the anterodorsal direction shortly after its narrow stem, continues as a longish blade with a concave posterodorsal surface and narrows distally into an anterodorsal tip. Its proximal and anteroventral margins appear strongly cuticulized.
The basis (Ba in Fig. 15C View Figure 15 ), from a posterior perspective, appears about as long as wide. Its anteromedial distal margin, however, extends into a prominent distally directed setose endite almost as long as the ischium and merus together, covering part of the anterior surface of the ischium.
A lamellar leaf- or spade-shaped exopod attaches proximolateral on the basis (Ex in Fig. 15C View Figure 15 ). It is almost as long as the basis, with flat anterior and posterior surfaces. It carries two distally directed setae on its tip and a row of finer setae on its dorsal margin.
The crescent-shaped endopod consists of the ischium, merus, carpus, propodus and dactylus. In relationship to the following podomeres, the ischium appears short (Is in Fig. 15C View Figure 15 ). Anteromedially, however, its distal margin extends into a prominent distally directed setose endite almost as long as the merus, covering part of the anterior surface of the merus. With the medial side of the ischium being about twice as long as its lateral side, its distal margin is displaced by ~35° in the lateral direction.
The merus (Me in Fig. 15C View Figure 15 ) measures about two to three times the length of the ischium. Distomedially, it protrudes into a setose lobe, but is not as prominent as the endites of the basis and ischium. The distal opening of the merus is not oriented distally but displaced ~90° in the lateral direction.
The carpus (Ca in Fig. 15C View Figure 15 ) is slightly longer than the merus. Its proximal margin (connected to the merus) faces medially, whereas its distal margin faces in the distal direction.
The propodus (Pr in Fig. 15C View Figure 15 ) is about as long as the merus and has a somewhat bulged and setose medial margin. The distal margin of the propodus is oriented in the medial direction.
The dactylus (Da in Fig. 15C View Figure 15 ) is slightly shorter than the propodus. It curves somewhat medially and tapers into a distal tip. Four cuspidate setae are present anterodistally.
No articulations could be recognized in the present analysis. Judging from the musculature ( Fig. 15A View Figure 15 ), all the endopodal joints seem to be movable in an anterior–posterior axis (i.e. performing adduction/ abduction).
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.